Shi Qiu 0002

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29ranked-venue papers
4as first author
15since 2021 · last 2025
0000-0001-8127-7594ORCID · conflict

Domains — the database's venue-derived domains; a paper can count in several

Applied, interdisciplinary, general and emerging computing · 21 · 2 first-author · 12 since 2021Artificial intelligence and machine learning · 6 · 1 first-author · 2 since 2021Computer networks · 1 · 1 first-authorDatabases, data management, data science and information retrieval · 1 · 1 since 2021
YearPublicationVenuePosition
2025 MCAMamba: Multilevel Cross-Modal Attention-Guided State-Space Model for Multisource Remote Sensing Image Classification
abstract
Effective fusion of multi-source remote sensing data remains a fundamental challenge for Earth observation, as CNN and Transformer models suffer from limited receptive fields and high computational complexity. While State Space Models (SSM) like Mamba show promise in sequence modeling, they face three critical challenges in multi-source remote sensing: insufficient spatial-spectral coordination, cross-modal heterogeneity, and inadequate multi-scale feature integration. To address these limitations, this paper proposes MCAMamba: a Multi-Level Cross-Modal Attention-Guided Mamba framework for joint classification of hyperspectral images (HSI) and Light Detection and Ranging (LiDAR)/Synthetic Aperture Radar (SAR) data. MCAMamba introduces a novel three-stage feature fusion pipeline: 1) The FExt-Attention module enhances spatial structure and spectral information through parallel spatial-channel attention mechanisms. 2) The SSM-Attention module achieves deep cross-modal fusion by combining attention mechanisms with SSM for parametric interaction. 3) The FFus-Attention module performs adaptive multi-scale feature integration through global context modeling and cascaded attention. This hierarchical design enables superior feature representation with enhanced computational efficiency. Experiments on four public benchmark datasets (Houston2013, Houston2018, Augsburg, and Berlin) show that MCAMamba achieves Overall Accuracy (OA) of 94.75%, 93.35%, 92.46%, and 79.18%. The code will be available at https://github.com/Dmygithub/MCAMamba.
Mingyu Dou, Shi Qiu 0002, Ming Hu 0001, Xiaozhen Qiao, Huping Ye, Xiaohan Liao, Zhe Sun 0007
IEEE Trans. Geosci. Remote. Sens.2
2024 Multinetwork Algorithm for Coastal Line Segmentation in Remote Sensing Images
abstract
The demarcation between the sea and the land, commonly referred to as the coastline, is of paramount importance for the dynamic monitoring of its alterations. This monitoring is essential for the effective utilization of marine resources and the conservation of the ecological environment. Addressing the challenges posed by the extensive expanse of coastal lines, which can complicate their acquisition and processing, this study utilizes remote sensing imagery to introduce an algorithm for coastal line segmentation. The algorithm integrates multiple networks to enhance its effectiveness. Innovations encompass the development of an extraction algorithm for coastal lines that are as follows. First, utilize an attention-guided conditional generative adversarial network (AC-GAN) model, which redefines the task of image segmentation by framing it as a style transformation problem. Second, a strategy for coastal line segmentation utilizes Dense Swin Transformer Unet (DSTUnet) to construct a densely structured model. This approach integrates Transformer to prioritize focal regions, thereby enhancing image and semantic interpretation. Third, a transfer learning framework is proposed to integrate multiple features, leveraging the strengths of different networks to achieve accurate segmentation of coastal lines. The study introduced two datasets, and the experimental results confirm that parallel network configurations and asymmetric weighting are superior in achieving optimal results, with an area overlap measure (AOM) score of 85%, outperforming the Unet by 5%.
Huping Ye, Shi Qiu 0002, Xiaohan Liao
IEEE Trans. Geosci. Remote. Sens.4
2023 Radiometric Correction of Incidence Angle and Distance Effects on Hyperspectral Lidar Point Cloud Classification
abstract
Hyperspectral LIDAR (HSL) is an innovative active remote sensing technology that allows for the simultaneous collection of spectral and spatial information. In this study, we primarily focus on the radiation correction method of the incident angle and distance effects for the backscatter intensity of HSL. We have developed a comprehensive radiometric correction model that addresses these effects. Additionally, we have applied the correction model to point cloud classification using the random forest method. Comparing the accuracy of point cloud classification before and after correction, we observed a 9.6% improvement in overall accuracy (OA) and a 10.8% improvement in the kappa coefficient. These results indicate that the radiometric correction model significantly enhances the classification accuracy.
Wenxin Tian, Lingli Tang, Yuwei Chen 0005, Shi Qiu 0002, Haohao Wu, Huijing Zhang, Linsheng Chen, Peilun Hu, Changhui Jiang, Jianxin Jia, Juha Hyyppä
IGARSS5
2023 Temperature and Emissivity Retrieval From Hyperspectral Thermal Infrared Data Using Dictionary-Based Sparse Representation for Emissivity
abstract
The separation of land surface temperature (LST) and land surface emissivity (LSE) is an ill-posed problem in thermal infrared (TIR) remote sensing. By building a new observation matrix to compress the LSE unknows and a dictionary training method to reconstruct complete LSE spectra, a new dictionary-based sparse representation for emissivity (DSRE) method has been proposed to retrieve LST and LSE from the atmospherically corrected hyperspectral TIR data. The proposed method fully utilizes the sparsity of compressed sensing and the empirical knowledge of the trained emissivity dictionary. The sensitivity analysis shows that the modeling accuracies of the proposed method are 0.215Kand 0.0060 for LST and LSE, respectively. Even with the instrument noise of 0.3Kand the uncertainties in atmospheric transmittance, atmospheric upwelling, and downwelling radiance of 10 %, the retrieval accuracies are 0.811Kfor LST and 0.0241 for LSE, respectively. Then a field experiment was conducted to validate the proposed method, and a comparison was executed to three published methods, including ASTER temperature-emissivity separation (ASTERTES), linear spectral emissivity constraint TES (LSECTES), and iterative spectrally smooth TES (ISSTES). The accuracies of retrieved LST and spectral LSE are 1.41K/ 0.009, 2.57K/ 0.071, 1.59K/ 0.038, and 2.00K/ 0.077 for DSRE, ASTERTES, LSECTES, and ISSTES. In contrast to the three published methods, our proposed method is more accurate and effective than other published methods. Especially in the atmospheric absorption band, the proposed method has a strong anti-noise capability to the residuals of environmental downwelling radiance.
Yonggang Qian, Kun Li 0019, Xianhui Dou, Huanfeng Shen, Hongzhao Tang, Shi Qiu 0002, Yuan-Yuan Jia, Guangzhou Ou-Yang
IEEE Trans. Geosci. Remote. Sens.7
2023 Coastal Zone Extraction Algorithm Based on Multilayer Depth Features for Hyperspectral Images
abstract
The coastal zone is the most active natural area on the Earth’s surface and has the most favorable resources and environmental conditions. Therefore, it is of great significance to conduct research based on the coastal zone. Hyperspectral remote sensing images have spatial and spectral dimensions that reflect the spatial distribution and can be analyze the compositional information, which have been widely used for feature analysis and observation of ground objects. In this paper, we propose a coastal zone extraction algorithm based on multilayer depth features for hyperspectral images. The main contributions are as follows: 1) The Huanjing satellite hyperspectral coastal zone database is built for the first time, image composition is analyzed, and the noise removal algorithm is yielded. 2) 3D attention networks that are capable of carrying spatial and inter-spectral information are proposed. 3) A 3D CNN with SENet tandem structure is proposed to fully exploit detailed information, and a multi-layer feature extraction framework is built. We analyze four typical coastal zone patterns, and the experimental results show that our proposed algorithm can achieve coastal zone extraction with an average Kappa coefficient of 0.92, which is 0.06 higher than the mainstream algorithms. Our algorithm also shows good performance in complex environments. It provides a basis for further research on coastal zones.
Shi Qiu 0002, Huping Ye, Xiaohan Liao
IEEE Trans. Geosci. Remote. Sens.1
2022 Plant Species Classification Using Hyperspectral LiDAR with Convolutional Neural Network
abstract
Convolutional neural networks (CNN) are capable of extracting features with high accuracy, which is dominant in visual-based classification. Previous researches demonstrate that CNN can extract essential features of the target in the plant feature extraction and classification. Hyperspectral LIDAR (HSL) is a novel active remote sensing technology that can simultaneously collect spectral and spatial information. This paper proposed a novel classification method named VI-CNN for hyperspectral LiDAR, which combines the spectral features with the vegetable index(VI). As far as we know, we are the first to apply CNN to HSL data classification. The VI -CNN is divided into two parts. Firstly, spectral CNN focuses on intra-spectral correlations; secondly, the vegetation indices supplement the biological parameters. The evaluation shows that the concatenation has stronger identification and robustness than standalone methods. The experimental results demonstrate that the VI-CNN significantly improves the classification accuracy against other traditional machine-learning methods.
Wenxin Tian, Lingli Tang, Yuwei Chen 0005, Shi Qiu 0002, Changhui Jiang, Peilun Hu, Jianxin Jia, Haohao Wu, Linsheng Chen, Juha Hyyppä
IGARSS5
2022 A Four-Component Parameterized Directional Thermal Radiance Model for Row Canopies
abstract
Directional brightness temperature (DBT) acquired by remote sensing instruments plays a significant role in characterizing the directional anisotropy of land surface, especially for row canopies. The difference between shaded vegetation and sunlit vegetation is ignored in the existing models. In this article, a four-component parameterized directional thermal radiance model (FCPMod) has been proposed to describe the DBT of the row canopy by considering the four components including the sunlit/shaded soil and sunlit/shaded leaf, the improved multiple scattering within the canopy, and the sensor’s field of view (FOV). First, the sensor’s FOV is divided into many tiny rectangles along the row direction and the probabilities of four components in each tiny rectangle are estimated based on the radiative transfer (RT) theory and the bidirectional gap probability. Second, the DBTs are weighted by the four components’ probabilities and brightness temperatures of tiny rectangles. Third, a modified multiple scattering model is proposed to improve the modeling accuracy by considering the contribution of the multiple scattering radiance between soil and canopy. The sensitivity analysis results show that the proposed method performed well compared to the FRA97 model proposed by Françoiset al.(1997) over continuous canopy and the RT model (FovMod) proposed by Renet al.(2013) over row canopy. Finally, the field validations on a maize row canopy show that the proposed FCPMod performed better than about 0.4 K compared with the FovMod.
Kun Li 0019, Yonggang Qian, Ning Wang 0011, Shi Qiu 0002, Lingling Ma 0001, Chuanrong Li, Dexin Sun, Yinnian Liu
IEEE Trans. Geosci. Remote. Sens.5
2022 A Spectrum Extension Approach for Radiometric Calibration of the Advanced Hyperspectral Imager Aboard the Gaofen-5 Satellite
abstract
The advanced hyperspectral imager (AHSI) is one of the sensors aboard the Chinese Gaofen-5 (GF-5) satellite, possessing characteristics of high spatial and spectral resolution, as well as width swath. To better understand the radiometric performance of GF-5/AHIS after its launch, this article presents an on-orbit radiometric calibration approach for AHSI visible and near-infrared (VNIR) and shortwave infrared (SWIR) sensors from field automatic observations with a field spectrometer in the absence of SWIR measurements. A spectrum extension method was proposed to extend the retrieved surface hyperspectral reflectance in the VNIR spectral ranges to SWIR by incorporating the historical hyperspectral reflectance library. The radiometric calibration coefficients of GF-5/AHSI were calculated by linear fitting of the observed digital number (DN) values with GF-5/AHSI and predicted at-sensor radiances with MODTRAN 5 based on extended hyperspectral surface reflectance. Comparisons with onboard calibration results were also performed, and the averaged relative differences were within 5% with$1\delta $standard deviations less than 10% for most bands, except for those in the atmospheric absorption and low signal-to-noise ratio bands. The comparison results indicate that the on-site radiometric calibration results are consistent with the onboard results, and the operational on-orbit radiometric calibration approach is reliable in the case that there are no measurements in the SWIR spectra range. The on-orbit radiometric performance of GF-5/AHSI rapidly degraded during the first several months after its launch and then tended to be relatively stable.
Yaokai Liu, Lingling Ma 0001, Yongguang Zhao, Ning Wang 0011, Yonggang Qian, Caixia Gao, Shi Qiu 0002, Chuanrong Li
IEEE Trans. Geosci. Remote. Sens.8
2021 Automatic Radiometric Calibration of Gaofen-1/WFV Cameras and Cross Validation with Sentinel-2/MSI
abstract
The Chinese Gaofen-1(GF-1) high resolution satellite loaded with four Wide Field of View (WFV) cameras provides observations with high temporal and spatial resolutions. However, the radiometric calibration accuracy of the GF1/WFV should be given when being used to monitoring the earth. In this study, radiometric calibration of the GF1/WFV was carried out first with automatic instrumented Baotou site. Then, the determined radiometric calibration coefficients were cross validated with the MultiSpectral Imager (MSI) onboard the Sentinel-2 satellite. The preliminary results show that the radiometric performances of the four WFV cameras are relatively stable with averaged relative difference less than -1.85%. The standard deviation of the radiometric calibration coefficients during the period from April 2019 to June 2020 is 0.0056, 0.0081, 0.0072, and 0.0076 with respect to the blue, green, red, and near infrared channel. The results of cross validation with Sentinel-2/MSI suggest that the averaged relative difference is -3.16%, -4.28%, -1.15%, and -3.22% with respect to the blue, green, red, and near infrared channel. The results of cross-validation demonstrate that radiometric calibration of the GF-1/WFV cameras using automatic instrumented Baotou site is feasible and operational. And, it is also essential and necessary to update the on-orbit radiometric calibration coefficients of GF-1/WFV cameras during its' entire lifetime for further quantitative application.
Yaokai Liu, Lingling Ma 0001, Renfei Wang, Yongguang Zhao, Ning Wang 0011, Yonggang Qian, Caixia Gao, Shi Qiu 0002
IGARSS9
2021 Preliminary Study on Feasibility of a Specialized Ground Light Source for Improving the VIIRS DNB Low Light Calibration
abstract
As the growing interest in the use of the Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) low light data, there is an urgent need to obtain high accuracy product at low radiances. Currently the low light calibration accuracy was previously estimated at a moderate 15% using extended sources while the long-term stability has yet to be characterized. This paper gives a new method to quantitative analysis DNB data by using a specialized ground light point source at night, which is active designed light sources at selected site (Baotou of Inner Mongolia, China). It presents a possibility to resolve the need for SI traceable active light sources to monitor the calibration stability, radiometric and geolocation accuracy, and point spread functions of the DNB.
Shi Qiu 0002, Benyong Yang, Yonggang Qian, Caixia Gao, Yaokai Liu
IGARSS1
2021 Vicarious Radiometric Calibration of Superview-1 Sensor Using RadCalNet TOA Reflectance Product
abstract
The Radiometric Calibration Network (RadCalNet) provide SI-traceable Top-of-Atmosphere (TOA) spectrally-resolved reflectance for automated radiometric calibration of optical satellite sensors. Each RadCalNet site is equipped with automated ground instrumentation in order to provide continuous measurements of both surface reflectance and local environmental/atmospheric conditions needed for the derivation of TOA reflectance values. It is very valuable to use these data in calibrating and motoring optical satellite sensors with the recent launches of very large number of satellites. The work presented here shows the results of vicarious calibration of SuperView-1 satellite sensor using RadCalNet TOA reflectance product. The results also indicated that there was a good consistency among the vicarious calibration coefficients from different RadCalNet sites.
Yongguang Zhao, Lingling Ma 0001, Huaying He, Xiaoxiang Long, Ning Wang 0011, Zhaoyan Liu, Yonggang Qian, Shi Qiu 0002, Yaokai Liu
IGARSS9
2021 Small Moving Target Recognition in Star Image with TRM
abstract
Recognition of small moving targets in space has become one of the frontier scientific researches in recent decade. Most of them focus on detection and recognition in star image with sidereal stare mode. However, in this research field, few researches are about detection and recognition in star image with track rate mode. In this paper, a novel approach is proposed to recognize the moving target in single frame by machine learning method based on elliptical characteristic extraction of star points. The technical path about recognition of moving target in space is redesigned instead of traditional processing approaches. Elliptical characteristics of each star point can be successfully extracted from single image. Machine learning can achieve the classification goal in order to make sure that all moving targets can be extracted. The experiments show that our proposed approach can have better performance in star images with different qualities.
Desheng Wen, Guizhong Liu, Shi Qiu 0002
Int. J. Pattern Recognit. Artif. Intell.4
2021 Accelerating patch-based low-rank image restoration using kd-forest and Lanczos approximation
Qiang Guo 0003, Yongxia Zhang, Shi Qiu 0002, Caiming Zhang 0001
Inf. Sci.3
2021 A motor imagery EEG signal classification algorithm based on recurrence plot convolution neural network
Xianjia Meng, Shi Qiu 0002, Shaohua Wan 0001, Keyang Cheng
Pattern Recognit. Lett.2
2021 A Novel Negative-Transfer-Resistant Fuzzy Clustering Model With a Shared Cross-Domain Transfer Latent Space and its Application to Brain CT Image Segmentation
abstract
Traditional clustering algorithms for medical image segmentation can only achieve satisfactory clustering performance under relatively ideal conditions, in which there is adequate data from the same distribution, and the data is rarely disturbed by noise or outliers. However, a sufficient amount of medical images with representative manual labels are often not available, because medical images are frequently acquired with different scanners (or different scan protocols) or polluted by various noises. Transfer learning improves learning in the target domain by leveraging knowledge from related domains. Given some target data, the performance of transfer learning is determined by the degree of relevance between the source and target domains. To achieve positive transfer and avoid negative transfer, a negative-transfer-resistant mechanism is proposed by computing the weight of transferred knowledge. Extracting a negative-transfer-resistant fuzzy clustering model with a shared cross-domain transfer latent space (called NTR-FC-SCT) is proposed by integrating negative-transfer-resistant and maximum mean discrepancy (MMD) into the framework of fuzzy c-means clustering. Experimental results show that the proposed NTR-FC-SCT model outperformed several traditional non-transfer and related transfer clustering algorithms.
Yizhang Jiang, Xiaoqing Gu, Dongrui Wu, Wenlong Hang, Shi Qiu 0002, Chin-Teng Lin
IEEE ACM Trans. Comput. Biol. Bioinform.6
2020 A Contribution Algorithm from LDRI to HDRI
abstract
High dynamic range image (HDRI) which is combined with low dynamic range image (LDRI) needs to be mapped to a low dynamic area to display. In the process of mapping, it is impossible to determine the contribution of low dynamic image sequences in the display images, so that it results in a problem that the low dynamic images cannot be accurately selected. In this paper, for the first time, a contribution algorithm from LDRI to HDRI according to the corresponding response curve of the camera is proposed.
Junsong Luo, Shi Qiu 0002, Yizhang Jiang, Keyang Cheng, Huping Ye, Mingjin Zhang
Int. J. Pattern Recognit. Artif. Intell.2
2020 A Data Encryption and Fast Transmission Algorithm Based on Surveillance Video
abstract
Video surveillance is an effective way to record current events. In view of the difficulty of efficient transmission of massive surveillance video and the risk of leakage in the transmission process, a new data encryption and fast transmission algorithm is proposed in this paper. From the perspective of events, the constraints of time and space dimension is broken. First, a background and moving object extraction model is built based on video composition. Then, a strong correlation data encryption and fast transmission model is constructed to achieve efficient data compression. Finally, a data mapping mechanism is established to realize the decoding of surveillance video. Our experimental results show that the compression ratio of the proposed algorithm is more than 60% under the premise of image confidentiality.
Shi Qiu 0002, Xianjia Meng
Wirel. Commun. Mob. Comput.1
2019 A Parameterized Directional Thermal Radiance Model for Row Crops
abstract
This paper describes a four-component parameterized directional thermal radiance model for row crops, which consists of the thermal radiance of the sunlit/shaded soil and sunlit/shaded leaf, multiple scattering effects of canopy and sensor field of view. The light transmission process of the row crops canopy has been full depicted and the accuracy and sensitivity of the proposed model are discussed in detail. Finally, compared with the FRA97 and FovMod models, the results show that the root mean square error(RMSE) is 0.18K and 0.36K, respectively.
Kun Li 0019, Yonggang Qian, Ning Wang 0011, Lingling Ma 0001, Shi Qiu 0002, Chuanrong Li, Lingli Tang, Yongguang Zhao
IGARSS5
2019 A Characteristic Extraction Algorithm Based on Blocking Star Images
abstract
The star images obtained through the CCD camera can visually display the star structure. In order to get the wide starry image, we need to extract the characteristics of star images to achieve the star image stitching. In the star images, star points, whose characteristics are limited, are easily influenced by noise and are also difficult to extract. The number of stars is too large to stitch accurately. Thus, we propose a stitching algorithm based on blocking star images. First, we establish the maximum intensity projection model based on time sequence to locate the star points accurately. Then, according to the relative positions of star points, the block model is introduced to realize the establishment of the characteristics. Finally, the star image stitching is achieved from the perspective of the characteristic similarity. The experiments illustrate that CM (combination measure) reaches 0.87, and the proposed algorithm has better anti-noise performance and robustness.
Desheng Wen, Guizhong Liu, Shi Qiu 0002
Int. J. Pattern Recognit. Artif. Intell.4
2019 Research on Applications of FastICA Algorithm in the Detection of Dangerous Liquids
abstract
In the actual environment of security detection, many kinds of liquids often exist in the same detection background, and their dangerous levels are difficult to identify. Therefore, it is very important to research on identifying the dangerous levels of various liquids. The paper establishes the [Formula: see text]-parameter database of tested samples under specific detection environment with free space method. In the actual detection, ultra-wide-band (UWB) centimeter wave is used to measure the [Formula: see text]-parameters of several detected liquids first. Then the fast independent component analysis (FastICA) algorithm is used for unmixing the mixed signal by Newton’s iteration method and the negative entropy maximization search principle. The unmixed signal matches with the sample database adaptively, so the dangerous levels of the detected liquids are identified. Multiple experiments show that FastICA algorithm can reach a matching rate of 95% between water and 90[Formula: see text] gasoline or alcohol and 90[Formula: see text] gasoline, it also can reach a matching rate of around 73% between water and alcohol. This algorithm has a quick response and high reliability for identification of dangerous liquids. FastICA algorithm in this paper is applied for detecting the dangerous liquids for the first time, and it has high application value.
Dongmei Zhou, Shi Qiu 0002, Jiahai Tan
Int. J. Pattern Recognit. Artif. Intell.2
2018 Star Map Stitching Algorithm Based on Visual Principle
abstract
For the problem that the limited star map field angle cannot obtain the complete star map accurately, the paper study astral intrinsic and imaging features, a star map stitching algorithm based on the principle of visual perception is proposed firstly. The matching models of time and space dimensions is constructed by simulating the visual perception, then the stars and the planets points are saved by searching the matching star group dynamically, the star map is stitched and reconstructed efficiently by creating the computer sparse storage model. The experimental results show that the algorithm can achieve data compression quickly, compression ratio is 99.54%, which can reduce complexity of manual processing and can achieve star map stitching accurately.
Shi Qiu 0002, Dongmei Zhou, Qiang Guo 0003, Hanlin Qin, Jinlong Yang 0002
Int. J. Pattern Recognit. Artif. Intell.1
2018 Feasibility Study of Ore Classification Using Active Hyperspectral LiDAR
abstract
Recently, a major effort has been made to develop methods or tools for rock characterization and mineral content mapping. Light detection and ranging (LiDAR) is an efficient active remote sensing technique for collecting geometry information about rock surfaces. However, traditional LiDAR sensors work with a single-wavelength laser source, and it is unfeasible to obtain spectral information using one LiDAR sensor. The combination of hyperspectral imaging and LiDAR techniques is an emerging method for acquiring spatial and spectral information simultaneously that allows remote mapping of high-resolution mineral content and distributions and identifies subtle chemical variations. Unfortunately, spatial and spectral data registration, which introduces additional complicated data processing, is an inevitable and essential issue for this method. In this letter, first, we investigate the feasibility of ore classification applications with hyperspectral LiDAR (HSL). HSL consists of 17 spectral channels covering the visible–shortwave infrared (SWIR) spectral range. Spatial and spectral information about seven different ore samples is obtained under a controlled laboratory environment using HSL. The standard deviation of the distance measurements is less than 1.1 cm for different spectral channels, and the classification accuracy can reach 100% if all 17 spectral measurements are used. To optimize the system design with lower cost and system complexity, a spectral band selection criterion is built based on the feature contribution degree (FCD), which is calculated using the normalized variance of the reflectance values for different ore samples at each wavelength. Two different strategies of FCD selection are tested to generate vectors: ascending sequences and descending sequences. Feature vectors with descending sequences have better classification accuracy. In addition, the results show that the classification accuracy can reach 100% with the feature vector of the seven largest FCD values compared to 59.57% for the feature vector with the seven smallest FCD values. Moreover, we find that the channels with high FCD values are primarily centered in SWIR bands. This result could be a reference for optimizing the hardware design of HSL for ore classification or mineral identification.
Yuwei Chen 0005, Changhui Jiang, Juha Hyyppä, Shi Qiu 0002, Zheng Wang 0054, Mi Tian 0005, Wei Li 0095, Eetu Puttonen, Hui Zhou 0013, Yuming Bo, Zhijie Wen
IEEE Geosci. Remote. Sens. Lett.4
2017 Land surface temperature retrieved from combined mid-infrared and thermal infrared data
abstract
This paper addressed the retrieval of land surface temperature (LST) from combined mid-infrared and thermal infrared data of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-Orbiting Partnership (S-NPP). To efficiently remove the effect of the direct solar radiance, a relationship between direct solar radiance and water vapor content, view zenith angle and solar zenith angle is proposed to improve the retrieve accuracy. Then, a split-window algorithm from combined mid-infrared and thermal infrared data is used to correct for the atmospheric effects and retrieve the LST with the aid of emissivity provide by VIIRS product. Finally, comparison of the standard VIIRS LST product and the retrieved LST from the proposed algorithm, a good agreement was shown. Analysis indicated the root mean square error (RMSE) of the LST over these land cover types is 2.04K for desert and 1.84K for vegetation, respectively.
Yonggang Qian, Kun Li 0019, Ning Wang 0011, Lingling Ma 0001, Yaokai Liu, Wei Li 0095, Shi Qiu 0002, Chuanrong Li, Lingli Tang
IGARSS8
2014 An Empirical Relationship of Bare Soil Microwave Emissions Between Vertical and Horizontal Polarization at 10.65 GHz
abstract
Land surface microwave emission is mainly a function of soil moisture and surface roughness. However, the relationship between vertical and horizontal polarization land surface emissivities is not fully understood. This study attempts to develop a parameterized relationship to relate the emissivities at different polarizations for bare surfaces. A microwave emission database is simulated for bare surfaces with a wide range of surface roughness and dielectric properties using the Dobson model and the Advanced Integral Equation Model (AIEM) at 10.65 GHz under the configuration of the Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E). By analyzing the factors that influence microwave emission, parameterized relationships between vertical and horizontal polarization emissivities are established. With the proposed relationships, the effects of soil moisture and surface roughness on the soil microwave emission signal can be separated. Simulated results using the proposed relationships are compared with those of the AIEM. These results show that the proposed relationships are accurate, with absolute root mean square errors (RMSEs) of 0.0025, and they can be used as a reliable boundary condition to retrieve other surface geophysical parameters. Combining this relationship with the calculated soil moisture, the RMSE of the estimated soil moisture is 0.44% using simulated data. As an example, observations of AMSR-E are used to estimate the variation in soil moisture in Saharan Africa in 2004. By comparing with independent soil moisture data, the result shows that the proposed relationship is promising for retrieving surface geophysical parameters from microwave observations.
Zeng-Lin Liu, Hua Wu 0001, Bo-Hui Tang, Shi Qiu 0002, Zhao-Liang Li
IEEE Geosci. Remote. Sens. Lett.4
2014 An Improved Algorithm for Retrieving Land Surface Emissivity and Temperature From MSG-2/SEVIRI Data
abstract
This paper presents an improved algorithm for simultaneously retrieving both land surface emissivity (LSE) and land surface temperature (LST) using data from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on board the MSG-2 satellite. First, the temperature-independent spectral index-based method for LSE retrieval is reviewed and improved in terms of three aspects: atmospheric correction, fitting of the bidirectional reflectivity model, and retrieval of the LSE in SEVIRI channel 10. Then, the generalized split-window method with seven unknown coefficients is used to derive the LST. Finally, this improved algorithm is applied to several MSG-2/SEVIRI data sets over a study area with geospatial coverage of latitude 30 ° N-45 ° N and longitude 15 ° W-15 ° E, and using detailed cases, the modifications to the original LSE/LST retrieval methods are shown to be effective and reasonable. In addition, the SEVIRI-derived LSTs are cross-validated primarily using the Moderate Resolution Imaging Spectroradiometer-derived validated LST data extracted from the MOD11B1 product on two clear-sky days (August 22, 2009 and July 3, 2008). The validation results indicate that more than 70% of the differences are within 2.5 K and that the LST differences tend to be lower at night than in the day, which may result from the homogeneous thermal conditions at night.
Caixia Gao, Zhao-Liang Li, Shi Qiu 0002, Bo-Hui Tang, Hua Wu 0001, Xiaoguang Jiang
IEEE Trans. Geosci. Remote. Sens.3
2013 A neural network based method for land surface temperature retrieval from AMSR-E passive microwave data
abstract
In this paper, a generalized regression neural network (GRNN) is used for land surface temperature (LST) retrieval from advanced microwave scanning radiometer-earth (AMSR-E) passive microwave data. To make neural network method more representative of the real situations, the simulated data under various atmospheric and surface conditions is generated with the aid of monochromatic radiative transfer model and the advances integral equation model, and is used to train GRNN, combined with AMSR-E measurements and MODIS LST product on the same platform (Aqua satellite). Because of the lack of simultaneous ground LST measurements in large scale, MODIS LSTs are taken as actual ground LST measurements. Through detailed analysis, the datasets in AMSR-E channels 23.8 V, 36.5 V, 89.0 V and 89.0 H GHz with the smallest root mean square error (RMSE) are used for LST retrieval, and the results show that more than 70% of errors are within 3 K, and the RMSE is 4.66 K.
Caixia Gao, Xiaoguang Jiang, Yonggang Qian, Shi Qiu 0002, Lingling Ma 0001, Zhao-Liang Li
IGARSS4
2012 Appropriate spatial resolution analysis based on land surface heterogeneity
abstract
In order to meet the various demands of remote sensing applications, it is still worth being discussed that whether higher resolution is necessarily better. Actually, the spatial resolution should be carefully chosen according to application demands, for optimizing the balance of effectiveness and cost. In this paper the concept of “appropriate spatial resolution” is used, which should be the spatial scale with least data volume and most interested information, while not the highest precision of information. Characterization of spatial heterogeneity is the basis of analyzing spatial structure of the image under the given spatial resolution, and it is also the basis of selection of appropriate spatial resolution. Based on the wavelet variance method to characterize spatial heterogeneity, appropriate spatial resolutions of albedo, NDVI and surface radiation temperature on the same research area are given. Results show that appropriate spatial resolutions to various retrieved physical properties are different due to different grades of spatial heterogeneity. Proper scale range will be obtained to observe certain geographic quantity, by operation of the appropriate resolution selection.
Lingling Ma 0001, Xinhong Wang, Chuanrong Li, Shi Qiu 0002
IGARSS4
2012 Estimation of the directional reflectance in Middle Infra-Red channel from SVISSR/FY-2C data
abstract
This work addressed the estimation of the directional reflectance in Middle Infra-Red (MIR) channel from the data acquired by the Stretched Visible and Infrared Spin Scan Radiometer (SVISSR) onboard Chinese geostationary Meteorological satellite FengYun 2C (FY-2C). SVISSR/FY-2C sensor acquires image covering the whole disk with a temporal resolution of 30 minutes. The MIR directional reflectance retrieval procedure can be seen as follows. Firstly, the atmospheric profiles data provided by European Centre for Medium-Range Weather Forecasts (ECMWF) were used to correct atmospheric influence with the radiative transfer code (MODTRAN 4.0). Secondly, the bi-directional reflectance in SVISSR/FY-2C MIR channel 4 (3.8 micron) was estimated from the combined MIR and TIR channel with day-night SVISSR/FY-2C data. Finally, a BRDF model referred to as the RossThick-LiSparse-R model was used to estimate the directional reflectance in MIR channel from the time-series bi-directional reflectance data. The results have been demonstrated that the method can be applied well to estimate the directional reflectance in MIR channel of SVISSR/FY-2C sensor.
Yonggang Qian, Shi Qiu 0002, Ning Wang 0011, Hua Wu 0001, Xiangsheng Kong, Xinhong Wang, Yaokai Liu, Yuan-Yuan Jia, Zhao-Liang Li, Lingli Tang, Chuanrong Li
IGARSS2
2010 Determination of Land Surface Temperature from AMSR-E data for bare surfaces
abstract
Land Surface Temperature (LST) is a major concern in the earth science. Accurately retrieving LST from passive microwave data will promote work in many other research fields. In this paper, a simple linear relationship is developed to relate the microwave surface emissivities at vertical and horizontal polarizations for the channels of Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) instrument. On the basis of this relationship and the radiative transfer equation, a method is also proposed to derive directly LST from AMSR-E data, provided that the volumetric soil moisture and atmospheric quantities are known or can be estimated a prior. The preliminary validation results indicate that LST can be obtained with a RMSE of 1.4 K from the simulated data with NEΔT=1.0 K, as for the actual AMSR-E data over the desert region, compared with MODIS LST product, the proposed method can give an estimation of LST with a RMSE of 4.9 K.
Zeng-Lin Liu, Hua Wu 0001, Shi Qiu 0002, Yuan-Yuan Jia, Zhao-Liang Li
IGARSS3