Land cover mapping at Alkali Flat and Lake Lucero,White Sands,New Mexico,USA using multi-temporal and multi-spectral remote sensing data     

Habes A. Ghrefat  Philip C. Goodell 《International Journal of Applied Earth Observation and Geoinformation》2011

The goal of this research is to map land cover patterns and to detect changes that occurred at Alkali Flat and Lake Lucero, White Sands using multispectral Landsat 7 Enhanced Thematic Mapper Plus (ETM+), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Advanced Land Imager (ALI), and hyperspectral Hyperion and Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data. The other objectives of this study were: (1) to evaluate the information dimensionality limits of Landsat 7 ETM+, ASTER, ALI, Hyperion, and AVIRIS data with respect to signal-to-noise and spectral resolution, (2) to determine the spatial distribution and fractional abundances of land cover endmembers, and (3) to check ground correspondence with satellite data. A better understanding of the spatial and spectral resolution of these sensors, optimum spectral bands and their information contents, appropriate image processing methods, spectral signatures of land cover classes, and atmospheric effects are needed to our ability to detect and map minerals from space. Image spectra were validated using samples collected from various localities across Alkali Flat and Lake Lucero. These samples were measured in the laboratory using VNIR–SWIR (0.4–2.5 μm) spectra and X-ray Diffraction (XRD) method. Dry gypsum deposits, wet gypsum deposits, standing water, green vegetation, and clastic alluvial sediments dominated by mixtures of ferric iron (ferricrete) and calcite were identified in the study area using Minimum Noise Fraction (MNF), Pixel Purity Index (PPI), and n-D Visualization. The results of MNF confirm that AVIRIS and Hyperion data have higher information dimensionality thresholds exceeding the number of available bands of Landsat 7 ETM+, ASTER, and ALI data. ASTER and ALI data can be a reasonable alternative to AVIRIS and Hyperion data for the purpose of monitoring land cover, hydrology and sedimentation in the basin. The spectral unmixing analysis and dimensionality eigen analysis between the various datasets helped to uncover the most optimum spatial–spectral–temporal and radiometric-resolution sensor characteristics for remote sensing based on monitoring of seasonal land cover, surface water, groundwater, and alluvial sediment input changes within the basin. The results demonstrated good agreement between ground truth data and XRD analysis of samples, and the results of Matched Filtering (MF) mapping method.  相似文献   

Application of evidential reasoning to improve the mapping of regenerating forest stands     

Brice Mora  Richard A. Fournier  Samuel Foucher 《International Journal of Applied Earth Observation and Geoinformation》2011

This study confirmed the ability of the Dempster–Shafer theory (DST) and the Dezert–Smarandache (Free DSm model) theory to significantly improve the quality of maps of regenerating forest stands in southern Quebec, Canada compared to a classical Maximum Likelihood Algorithm (MLA). The proposed approach uses data fusion methods that allow the integration of remotely sensed imagery with conventional maps of ecophysiographic features. While the MLA provided an overall accuracy of 82.75%, the DST and Free DSm models had overall accuracies of 90.14% and 91.13% respectively. In addition, this study showed that the data fusion methods can model the influence of biophysical parameters (e.g., surface deposits and drainage) on the growth potential of regenerating forest stands. This study illustrates the importance of the mass function allocation for each ancillary data source. We found that a Bayesian belief configuration provided results equivalent to those obtained when representing data uncertainty. This demonstrates the difficulty in modelling uncertainty associated with each ancillary source.  相似文献   

Mapping grassland leaf area index with airborne hyperspectral imagery: A comparison study of statistical approaches and inversion of radiative transfer models   总被引：4，自引：0，他引：4  

Roshanak Darvishzadeh  Clement Atzberger  Andrew Skidmore  Martin Schlerf 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(6):894-906

Statistical and physical models have seldom been compared in studying grasslands. In this paper, both modeling approaches are investigated for mapping leaf area index (LAI) in a Mediterranean grassland (Majella National Park, Italy) using HyMap airborne hyperspectral images. We compared inversion of the PROSAIL radiative transfer model with narrow band vegetation indices (NDVI-like and SAVI2-like) and partial least squares regression (PLS). To assess the performance of the investigated models, the normalized RMSE (nRMSE) and R² between in situ measurements of leaf area index and estimated parameter values are reported. The results of the study demonstrate that LAI can be estimated through PROSAIL inversion with accuracies comparable to those of statistical approaches (R² = 0.89, nRMSE = 0.22). The accuracy of the radiative transfer model inversion was further increased by using only a spectral subset of the data (R² = 0.91, nRMSE = 0.18). For the feature selection wavebands not well simulated by PROSAIL were sequentially discarded until all bands fulfilled the imposed accuracy requirements.  相似文献   

《数字化测图》教学内容探讨     

孟凡超  刘幼华 《地理空间信息》2011,9(3):178-179,182

根据测绘生产单位对工程测量技术人才的需求,并针对<数字化测图>课程的特点,对以一幅地形图测绘为主线的教学内容进行探索与实践,通过不断的调整与改革,从而提高高职工程测量技术专业的教学质量,增强学生的动手能力和就业竞争力.  相似文献   

FME在数据转换中的应用     

夏兴东  沈娟红 《现代测绘》2011,34(3):62-64

本文介绍基于FME空间数据转换系统。以基础地理信息数据为例,在AutoCAD格式数据与GIS格式数据之间构建映射关系文件,实现CAD数据到GIS数据转换的过程和方法。  相似文献   

测绘成果目录发布系统的设计与实现   总被引：1，自引：0，他引：1  

李金朋  赵丽丽  陈小虎 《测绘与空间地理信息》2011,34(5):107-108

采用当前流行的Service GIS和Silverlight技术建立测绘成果目录发布系统,解决了目前测绘生产部门数据管理和共享应用方面存在的问题。  相似文献   

基于光谱角制图法的遥感异常信息提取     

付洪波 《测绘与空间地理信息》2011,(6):82-84

借用光谱角制图法,依据所用数据与参考端元矢量之间的夹角不同,对研究区进行空间区域划分,在不同空间区域采用不同方法和参数提取遥感异常信息,所得结果结合遥感地质解译（岩性、构造）圈定出研究区内的找矿远景区。  相似文献   

ArcGIS地统计分析在地下水脆弱性评价中的应用     

肖兴平 《测绘与空间地理信息》2011,(6):124-126

地下水是水资源的重要组成部份,地下水污染危害人的健康,影响人们的生产和生活,查明某一地区地下水容易受污染的可能性即地下水脆弱性,能为管理决策部门提供合理开发地下水资源,防治地下水污染的科学规划和管理依据。在脆弱性评价工作中,应用当前国际上最先进的地理信息系统平台ArcGIS,并结合地统计分析原理,完成地下水系统脆弱性编...  相似文献   

网格化城市管理卫星技术综合应用研究     

王洪深  吴江寿  吴强华 《测绘软科学研究》2014,(1):56-62

总结了网格化城市管理新模式由数字城管向智慧城管发展、城市管理范围由建成区向城乡结合部延伸所需解决的问题及对卫星技术应用的迫切需求,结合国家在卫星遥感和卫星导航方面的技术进展,探讨了网格化城市管理卫星技术综合应用服务平台的总体架构设计和主要子系统划分,并对人员和车辆精细化管理、车载视频快速上报城市管理案件、高精度移动测量技术、基于高分辨率遥感影像的城乡结合部基础数据提取技术、基于定位实景融合技术的城管业务动态监管、实景影像动态数据更新技术等关键技术进行了具体阐述。本文的部分研究成果已经在宁波市智慧城管和杭州市实景影像系统建设中进行了示范应用,取得了良好效果。  相似文献   

ADS80航摄影像在省级基础测绘中的控制点布设方案研究     

王铁军  郑福海  郄惠强 《测绘软科学研究》2014,(1):97-100

基于省级1：10 000基础测绘成图,以试验生产的方式探讨了ADS80数码相机航摄影像生产的关键技术——Level 0级影像空中三角测量和空三加密后的Level 1级影像立体测图,分析了不同影像地面分辨率、不同控制点数量和分布条件下ADS80影像的后处理精度,提出了ADS80影像在1：10 000成图中的控制点布设方案,结果可以为省级基础测绘生产提供参考依据。  相似文献