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International Journal of Digital Earth 2014年第6期7卷 432-449页

作者： Yi Lin Juha Hyyppa department of remote sensing and photogrammetry Finnish Geodetic Institute MasalaFinland

As a state-of-the-art mapping technology,mobile laser scanning(MLS)is increasingly applied to fields such as digital presentations of city ***,its application has recently met a bottleneck in data *** has been found that conventional methods for geometrically modeling 3D scattered points are inadequate when dealing with large volumes of MLS *** fact,this is a challenge that has already been noted in the MLS-relevant fields,*** sensing,robot perception,and pattern recognition.A variety of algorithms under the schematic frame of analysis,modeling and synthesis(AMS)have been developed in these *** AMS paradigm is to first extract the implicit geometric primitives within each scan profile by geometrically modeling its 2D scattered points(GM2P).The resultant 2D geometric primitives are then integrated to restore the real 3D geometrical *** this process,GM2P is a kernel procedure whereby a review of the GM2P algorithms is assumed to be of significance for developing new efficient algorithms for geometrically modeling 3D scattered *** idea is supported by MLS sampling often being executed via parallel scan ***,the results of the literature review indicate an avenue for methodologically improving MLS in data processing.

关键词： MLS geometrically modeling scattered points GM2P AMS scan profile

Assessment of different topographic correction methods in ALOS AVNIR-2 data over a forest area

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International Journal of Digital Earth 2013年第5期6卷 504-520页

作者： Nafiseh Ghasemi Ali Mohammadzadeh Mahmod Reza Sahebi department of photogrammetry&remote sensing Faculty of Geodesy and GeomaticsK.N.Toosi University of TechnologyTehranIran

Because the removal of topographic effects is one the most important preprocessing steps when extracting information from satellite images in digital Earth applications,the problem of differential terrain illumination on satellite imagery has been investigated for at least 20 *** there is no superior topographic correction method applicable to all areas and all images,a comparison of topographic normalization methods in different regions and images is *** this study,common topographic correction methods were applied on an ALOS AVNIR-2 image of a rugged forest area,and the results were evaluated through different *** results show that the simple correction methods[Cosine,Sun-Canopy-sensor(SCS),and Minnaert correction]are inefficient in exceptionally rough *** the improved correction methods(SCSC,modified Minnaert,and pixel-based Minnaert),the best result was achieved using a pixel-based Minnaert approach in which a separate correction factor in various slope angles is ***,this method should be considered for topographic correction,especially in forests with severe topography.

关键词： ALOS AVNIR-2 C Cosine digital earth forest Minnaert modified Minnaert pixel-based Minnaert SCS topographic correction

Component-adaptive up-sampling for inter layer interpolation in scalable video coding

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Science in China(Series F) 2009年第4期52卷 704-711页

作者： WANG Zhang ZHANG JiXian LI HaiTao Institute of photogrammetry and remote sensing Chinese Academy of Surveying and Mapping Beijing 100039 China

Scalable video coding （SVC） is a newly emerging standard to be finalized as an extension of H.264/AVC. The most attractive characters in SVC are the inter layer prediction techniques, such as Intra_BL mode. But in current SVC scheme, a uniform up-sampling filter （UUSF） is employed to magnify all components of an image, which will be very inefficient and result in a lot of redundant computational complexity. To overcome this, we propose an efficient component-adaptive up-sampling filter （CAUSF） for inter layer interpolation. In CAUSF, one character of human vision system is considered, and different up- sampling filters are assigned to different components. In particular, the six-tap FIR filter used in UUSF is kept and assigned for luminance component. But for chrominance components, a new four-tap FIR filter is used. Experimental results show that CAUSF maintains the performances of coded bit-rate and PSNR-Y without any noticeable loss, and provides significant reduction in computational complexity.

关键词： scalable video coding spatial interpolation up-sampling filter human vision system

Use of GIS technology and cellular automata for modeling multiple socio-economic scenarios of regional spatial development and inter-regional cooperation

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Geo-Spatial Information Science 2023年第1期26卷 71-93页

作者： Igor Musikhin Alexander Karpik department of photogrammetry and remote sensing Siberian State University of Geosystems and TechnologiesNovosibirskRussia department of Space and Physical Geodesy Siberian State University of Geosystems and TechnologiesNovosibirskRussia

The advancement of effective spatial planning to support sustainable development and interregional cooperation has become an issue of serious concern for regional *** planning research helps to identify economic clusters and analyze their changing spatial patterns,which is important for understanding regional economic space dynamics and poten-tial inter-regional *** support decision-makers in the development of efficient plans of spatial development encompassing the identification of the best-suited territories,a combined Geographic Information System(GIS)based approach to interpret qualitatively expressed multiple socio-economic scenarios in quantitative map-based terms of graded suitability,and a formalized approach to the socio-economic evaluation of the territory is *** on GIS technology coupled with integrated cellular automata decision analysis techniques,the study provides a method that performs socio-economic assessment of the study area according to the generated scenarios of regional spatial and socio-economic *** proposed method is applied to Primorsky and Khabarovsk Krais,located in the Russian Far ***-economic scenarios of spatial development initiated by investors and regional authorities were assessed and *** generated socio-economic scenar-ios illustrate how the unified set of spatial and socio-economic variables can be linked and used to gain insights into inter-regional socio-economic and spatial *** application results demonstrate the advantage of the proposed method in identifying the best-suited unit areas for targeted regional development.

关键词： Geographic Information System(GIS) spatial development socioeconomic scenarios interregional cooperation open source software Cellular Automata(CA)

Assessment of temporal dynamics of snow cover and its validation with hydro-meteorological data in parts of Chenab Basin, western Himalayas

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Science China Earth Sciences 2016年第5期59卷 1081-1094页

作者： Retinder KOUR Nilanchal PATEL Akhouri Pramod KRISHNA department of remote sensing Birla Institute of Technology Mesra

The present investigation was conducted to analyze the temporal patterns of snow cover area%(SCA%), air temperature, snowfall and river discharge in parts of Chenab basin, western Himalayas. The relationship of mean SCA% with mean air temperature and river discharge was also tested using Pearson's product-moment correlation at 95% confidence limit and further sensitivity analysis of river discharge to SCA and SCA to air temperature was performed. Moderate Resolution Imaging Spectroradiometer(MODIS) 8-day surface reflectance product MOD09A1 was used to delineate SCA during the period 2000–2013. Moreover, variation in the lowest elevation from where snow cover area starts(LESCA) was also analyzed and its relationship with mean air temperature was also studied. Non-parametric method, Mann-Kendall test was employed to determine the trend in the SCA%, air temperature, snowfall and river discharge. The investigation carried out for three meteorological stations i.e. Batote, Reasi and Tandi revealed significant findings. At Batote and Reasi, statistically significant decreasing trends were observed over the period 2000 to 2012, for maximum, minimum and mean air temperature. Mean minimum SCA% exhibited a significant upward trend during 2000–2013 which is corroborated by the significantly increasing trend of mean annual snowfall(Tandi station) from 2000 to 2010. Further, significant decreasing trend of river discharge for the winter season at Batote station from 2000 to 2011 and decreasing trends in the maximum, minimum and mean air temperature at Batote and Reasi stations are also consistent with the increasing trend of SCA%. At both Batote and Reasi stations, mean SCA% exhibited significant negative relationship with the mean air temperature. On the other hand, LESCA exhibited positive correlation with the mean air temperature except in a few months, where negative relationship was seen. Sensitivity analysis of river discharge to SCA exhibited very low values of sensitivit

关键词： Chenab basin SCA Mann-Kendall test MODIS Western Himalayas Sensitivity analysis

Scale effect of Planck's law over nonisothermal blackbody surface

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Science China(Technological Sciences) 1999年第6期42卷 652-656页

作者：李小文王锦地 A. H. Strahler Research Center for remote sensing and GIS Beijing Normal University department of Geography and Center for remote sensing

Many physical laws, principles, models, measurement methods, etc., are applicable only to either a point on surface or a homogeneous surface. However, remote sensing deals with pixels which may range from meters to kilometers. Therefore scale effects of these laws and measurements are inevitable problems which must be faced. As an example, the spatial scale effect of Planck Law over nonisothermal blackbody surface is considered.

关键词： scale effect Planck’s law reciprocity.

Progress and perspectives of point cloud intelligence

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Geo-Spatial Information Science 2023年第2期26卷 189-205页

作者： Bisheng Yang Nobert Haala Zhen Dong State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina Institute for photogrammetry Stuttgart UniversityStuttgartGermany

With the rapid development of reality capture methods,such as laser scanning and oblique photogrammetry,point cloud data have become the third most important data source,after vector maps and *** cloud data also play an increasingly important role in scientific research and engineering in the fields of Earth science,spatial cognition,and smart ***,how to acquire high-quality three-dimensional(3D)geospatial information from point clouds has become a scientific frontier,for which there is an urgent demand in the fields of surveying and mapping,as well as geoscience *** address the challenges mentioned above,point cloud intelligence came into *** paper summarizes the state-of-the-art of point cloud intelligence,with regard to acquisition equipment,intelligent processing,scientific research,and engineering *** this purpose,we refer to a recent project on the hybrid georeferencing of images and LiDAR data for high-quality point cloud collection,as well as a current benchmark for the semantic segmentation of high-resolution 3D point *** projects were conducted at the Institute for photogrammetry,the University of Stuttgart,which was initially headed by the late ***,the development prospects of point cloud intelligence are summarized.

关键词： Point cloud big data point cloud intelligence semantic labeling structured modeling machine learning

Enrichment of topographic road database for the purpose of routing and navigation

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International Journal of Digital Earth 2014年第5期7卷 411-431页

作者： Meng Zhang Wei Yao Liqiu Meng department of Earth and Environmental Sciences Xi’an Jiaotong UniversityXi’anChina department of photogrammetry and remote sensing Technische Universitaet MuenchenMunichGermany department of Cartography Technische Universitaet MuenchenMunichGermany

With growing demand on multi-purpose or multi-modal navigation,the route calculation needs to traverse semantically enriched road networks for different transportation ***,operational route planning algorithms reveal rather limited performances or their potential for comprehensive applications are constrained by the unavailable or insufficient interoperation among the under-lying geo-data that are separately maintained in different spatial *** overcome this limitation,a novel approach has been proposed to integrate the routing-relevant information from different data sources,which involves three processes:(1)automatic matching to identify the corresponding road objects between different datasets;(2)interaction to refine the automatic matching result;and(3)transferring the routing-relevant information from one data-set to *** process(1),the Delimited Stroke Oriented algorithm is employed to achieve the automatic data matching between different datasets,which has revealed a high matching rate and *** uncertain matching problems occur in areas where topological conditions are too complicated or *** remaining unmatched or wrongly matched objects are treated in process(2),with the help of a series of interaction *** the basis of refined matching results after the interaction,process(3)is dedicated to automatic integration of the routing-relevant information from different data sources.

关键词： data matching data integration routing-relevant geospatial data-set road network

Research on scale effect of histogram

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Science China Earth Sciences 2002年第10期45卷 949-960页

作者：张颢李小文阎广建焦子锑王锦地赵红蕊杨华苏理宏 Research Center for remote sensing and GIS Department of Geography and Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities Beijing Normal University Beijing China Center for remote sensing and department of Geography Boston University USA

To describe the spatial relationship among the earth objects compactly, in this paper, we raised the concept of histo-variogram based on the analysis of the characteristics of other spatial analyzing methods such as variogram, information entropy. And we also raised a new spatial analysis method of histogram decomposition based on the definition of standing pixel and contour pixel. At the end of this paper, we demonstrated the characteristics of histo-variogram by two experiments, one for spatial analysis, the other for image fusion.

关键词： histo-variogram, scaling, histogram-decomposition, standing-pixel, HIS transform.

Apparent reciprocity failure in directional reflectance of structured surfaces

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Progress in Natural Science:Materials International 1999年第10期9卷 28-33页

作者：李小文,王锦地,Alan H.STRAHLER Research Center for remote sensing Beijing Normal University Beijing 100875 China Center for remote sensing and department of Geography Boston University MA 02215 USA Research Center for remote sensing Beijing Normal University Beijing 100875 China Center for remote sensing and department of Geography Boston University MA 02215 USA

Whether the reciprocity principle can be applied to the field or satellite observations of directional reflectance of land surface has been a question important to both theory and practice of land surface remote sensing. Under the assumption that every point on ground follows reciprocity, this paper explains why the heterogeneity of land surface can still yield apparent failure of the principle at the scale of remote sensing pixel.

关键词： reciprocity structure BRDF