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  • 1
    Online Resource
    Online Resource
    A MODIS-based perpendicular moisture index to retrieve leaf moisture content of forest canopies
    Informa UK Limited ; 2014
    In:  International Journal of Remote Sensing Vol. 35, No. 5 ( 2014-03-04), p. 1829-1845
    Details
    In: International Journal of Remote Sensing, Informa UK Limited, Vol. 35, No. 5 ( 2014-03-04), p. 1829-1845
    Type of Medium: Online Resource
    ISSN: 0143-1161 , 1366-5901
    URL: Article
    DOI: 10.1080/01431161.2013.879348
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2014
    detail.hit.zdb_id: 1497529-4
    detail.hit.zdb_id: 754117-X
    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Impacts of the Silk Road pattern on the interdecadal variations of the atmospheric heat source over the Tibetan Plateau
    Elsevier BV ; 2021
    In:  Atmospheric Research Vol. 260 ( 2021-10), p. 105696-
    Details
    In: Atmospheric Research, Elsevier BV, Vol. 260 ( 2021-10), p. 105696-
    Type of Medium: Online Resource
    ISSN: 0169-8095
    URL: Article
    DOI: 10.1016/j.atmosres.2021.105696
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2012396-6
    detail.hit.zdb_id: 233023-4
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Anisotropy Parameterization Development and Evaluation for Glacier Surface Albedo Retrieval from Satellite Observations
    MDPI AG ; 2021
    In:  Remote Sensing Vol. 13, No. 9 ( 2021-04-28), p. 1714-
    Details
    In: Remote Sensing, MDPI AG, Vol. 13, No. 9 ( 2021-04-28), p. 1714-
    Abstract: Glacier albedo determines the net shortwave radiation absorbed at the glacier surface and plays a crucial role in glacier energy and mass balance. Remote sensing techniques are efficient means to retrieve glacier surface albedo over large and inaccessible areas and to study its variability. However, corrections of anisotropic reflectance of glacier surface have been established for specific shortwave bands only, such as Landsat 5 Thematic Mapper (L5/TM) band 2 and band 4, which is a major limitation of current retrievals of glacier broadband albedo. In this study, we calibrated and evaluated four anisotropy correction models for glacier snow and ice, applicable to visible, near-infrared and shortwave-infrared wavelengths using airborne datasets of Bidirectional Reflectance Distribution Function (BRDF). We then tested the ability of the best-performing anisotropy correction model, referred to from here on as the ‘updated model’, to retrieve albedo from L5/TM, Landsat 8 Operational Land Imager (L8/OLI) and Moderate Resolution Imaging Spectroradiometer (MODIS) imagery, and evaluated these results with field measurements collected on eight glaciers around the world. Our results show that the updated model: (1) can accurately estimate anisotropic factors of reflectance for snow and ice surfaces; (2) generally performs better than prior approaches for L8/OLI albedo retrieval but is not appropriate for L5/TM; (3) generally retrieves MODIS albedo better than the MODIS standard albedo product (MCD43A3) in both absolute values and glacier albedo temporal evolution, i.e., exhibiting both fewer gaps and better agreement with field observations. As the updated model enables anisotropy correction of a maximum of 10 multispectral bands and is implemented in Google Earth Engine (GEE), it is promising for observing and analyzing glacier albedo at large spatial scales.
    Type of Medium: Online Resource
    ISSN: 2072-4292
    URL: Article
    DOI: 10.3390/rs13091714
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2513863-7
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  • 4
    Online Resource
    Online Resource
    Change Detection Algorithm for Multi-Temporal Remote Sensing Images Based on Adaptive Parameter Estimation
    Institute of Electrical and Electronics Engineers (IEEE) ; 2020
    In:  IEEE Access Vol. 8 ( 2020), p. 106083-106096
    Details
    In: IEEE Access, Institute of Electrical and Electronics Engineers (IEEE), Vol. 8 ( 2020), p. 106083-106096
    Type of Medium: Online Resource
    ISSN: 2169-3536
    URL: Journal
    URL: Article
    DOI: 10.1109/Access.6287639
    DOI: 10.1109/ACCESS.2020.2993910
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2020
    detail.hit.zdb_id: 2687964-5
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  • 5
    Online Resource
    Online Resource
    COARSE POINT CLOUD REGISTRATION BY EGI MATCHING OF VOXEL CLUSTERS
    Copernicus GmbH ; 2016
    In:  ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences Vol. III-5 ( 2016-06-06), p. 97-103
    Details
    In: ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Copernicus GmbH, Vol. III-5 ( 2016-06-06), p. 97-103
    Abstract: Abstract. Laser scanning samples the surface geometry of objects efficiently and records versatile information as point clouds. However, often more scans are required to fully cover a scene. Therefore, a registration step is required that transforms the different scans into a common coordinate system. The registration of point clouds is usually conducted in two steps, i.e. coarse registration followed by fine registration. In this study an automatic marker-free coarse registration method for pair-wise scans is presented. First the two input point clouds are re-sampled as voxels and dimensionality features of the voxels are determined by principal component analysis (PCA). Then voxel cells with the same dimensionality are clustered. Next, the Extended Gaussian Image (EGI) descriptor of those voxel clusters are constructed using significant eigenvectors of each voxel in the cluster. Correspondences between clusters in source and target data are obtained according to the similarity between their EGI descriptors. The random sampling consensus (RANSAC) algorithm is employed to remove outlying correspondences until a coarse alignment is obtained. If necessary, a fine registration is performed in a final step. This new method is illustrated on scan data sampling two indoor scenarios. The results of the tests are evaluated by computing the point to point distance between the two input point clouds. The presented two tests resulted in mean distances of 7.6 mm and 9.5 mm respectively, which are adequate for fine registration.
    Type of Medium: Online Resource
    ISSN: 2194-9050
    URL: Article
    DOI: 10.5194/isprs-annals-III-5-97-2016
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2016
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  • 6
    Online Resource
    Online Resource
    Spatiotemporal Patterns in Land Use/Land Cover Observed by Fusion of Multi-Source Fine-Resolution Data in West Africa
    MDPI AG ; 2023
    In:  Land Vol. 12, No. 5 ( 2023-05-09), p. 1032-
    Details
    In: Land, MDPI AG, Vol. 12, No. 5 ( 2023-05-09), p. 1032-
    Abstract: Land Use/Land Cover (LULC) change is a major global concern and a topic of scientific debate. In West Africa, the key trend among the changes of the past few years is the loss of natural vegetation related to changes in different LULC categories, e.g., water bodies, wetland, and bare soil. However, not all detected changes in these LULC categories are relevant for LULC change management intervention in a resource-constrained continent, as a massive change in the dominant LULC types may be due to errors in the LULC maps. Previous LULC change analysis detected large discrepancies in the existing LULC maps in Africa. Here, we applied an open and synergistic framework to update and improve the existing LULC maps for West Africa at five-year intervals from 1990 to 2020—updating them to a finer spatial resolution of 30 m. Next, we detected spatial–temporal patterns in past and present LULC changes with the intensity analysis framework, focusing on the following periods: 1990–2000, 2000–2010, and 2010–2020. A faster annual rate of overall transition was detected in 1990–2000 and 2010–2020 than in 2000–2010. We observed consistent increases in shrubland and grassland in all of the periods, which confirms the observed re-greening of rangeland in West Africa. By contrast, forestland areas experienced consistent decreases over the entire period, indicating deforestation and degradation. We observed a net loss for cropland in the drought period and net gains in the subsequent periods. The settlement category also gained actively in all periods. Net losses of wetland and bare land categories were also observed in all of the periods. We observed net gains in water bodies in the 1990–2000 period and net losses in the 2010–2020 period. We highlighted the active forestland losses as systematic and issued a clarion call for an intervention. The simultaneous active gross loss and gain intensity of cropland raises food security concerns and should act as an early warning sign to policy makers that the food security of marginal geographic locations is under threat, despite the massive expansion of cropland observed in this study area. Instead of focusing on the dynamics of all the LULC categories that may be irrelevant, the intensity analysis framework was vital in identifying the settlement category relevant for LULC change management intervention in West Africa, as well as a cost-effective LULC change management approach.
    Type of Medium: Online Resource
    ISSN: 2073-445X
    URL: Article
    DOI: 10.3390/land12051032
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2682955-1
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  • 7
    Online Resource
    Online Resource
    Observation and simulation of lake‐air heat and water transfer processes in a high‐altitude shallow lake on the Tibetan Plateau
    American Geophysical Union (AGU) ; 2015
    In:  Journal of Geophysical Research: Atmospheres Vol. 120, No. 24 ( 2015-12-27), p. 12327-12344
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 120, No. 24 ( 2015-12-27), p. 12327-12344
    Abstract: Measurements of turbulent exchange are presented and analyzed for a lake on the Tibetan Plateau The wave pattern in shallow lakes gives a larger roughness length for momentum Free convection gives a square root dependence of latent heat flux on wind speed
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrd.v120.24
    DOI: 10.1002/2015JD023863
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2015
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 2969341-X
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Analyzing the Inundation Pattern of the Poyang Lake Floodplain by Passive Microwave Data
    American Meteorological Society ; 2015
    In:  Journal of Hydrometeorology Vol. 16, No. 2 ( 2015-04-01), p. 652-667
    Details
    In: Journal of Hydrometeorology, American Meteorological Society, Vol. 16, No. 2 ( 2015-04-01), p. 652-667
    Abstract: The soil wetness condition is a useful indicator of inundation hazard in floodplains, such as the Poyang Lake floodplain. Special Sensor Microwave Imager (SSM/I) passive microwave data were used to monitor water-saturated soil and open water areas of the Poyang Lake floodplain from 2001 to 2008, capturing the inundation patterns of this area in space and time. The polarization difference brightness temperature (PDBT) at 37 GHz is sensitive to the water extension even under dense vegetation. The zero-order radiative transfer model was simplified to retrieve the vertical–horizontal (V–H)-polarized effective emissivity difference from the PDBT at 37 GHz. Vegetation fractional area and vegetation transmission function were derived from NDVI to represent the vegetation attenuation. This effective emissivity difference has a quasi-linear relationship with the fractional area of water-saturated soil and standing water, no matter the frequency. Using the multifrequency-polarization surface emission (Qp) model and the Dobson model of the soil–water mixture, the two segments of this relationship were combined into a quasi-linear model. Comparing the retrieved water-saturated soil and standing water area of Poyang Lake with the lake area obtained from the MODIS and synthetic aperture radar (SAR) image at higher spatial resolution, the calculations show a good fit with the MODIS and SAR data, with R2 = 0.7664 and relative RMSE = 17.74%. The cross-correlation analysis shows that the Poyang Lake extension fluctuates with a 5-day time lag with the upstream land area of water-saturated soil and standing water. Since the closure of the Three Gorges Dam, this relationship is more evident.
    Type of Medium: Online Resource
    ISSN: 1525-755X , 1525-7541
    URL: Article
    DOI: 10.1175/JHM-D-14-0022.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2015
    detail.hit.zdb_id: 2042176-X
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  • 9
    Online Resource
    Online Resource
    Analysis of the land surface heterogeneity and its impact on atmospheric variables and the aerodynamic and thermodynamic roughness lengths
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. D8 ( 2008-04-24)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. D8 ( 2008-04-24)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2007JD009124
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
    detail.hit.zdb_id: 2033040-6
    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Mapping isogrowth zones on continental scale using temporal Fourier analysis of AVHRR-NDVI data
    Elsevier BV ; 1999
    In:  International Journal of Applied Earth Observation and Geoinformation Vol. 1, No. 1 ( 1999), p. 9-20
    Details
    In: International Journal of Applied Earth Observation and Geoinformation, Elsevier BV, Vol. 1, No. 1 ( 1999), p. 9-20
    Type of Medium: Online Resource
    ISSN: 1569-8432
    URL: Article
    DOI: 10.1016/S0303-2434(99)85023-5
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1999
    detail.hit.zdb_id: 2097960-5
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