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标题：Enhancing The Prospects for Mapping from High-resolution satellite Imagery in The Developing World
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作者：I. Trisirisatayawong ; T. Jongrugenun ; B. Phalakarn 等
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXV Part B6
页码：78-82
出版社：Copernicus Publications
摘要：High-resolution satellite imagery (HRSI) has demonstrated the capability of generating orthoimagery and DTMs that meet topographic map specification to 1:10,000 scale. Moreover, the generation of image-derived products from HRSI requires very little in the way of ground survey data, thus making this imagery an ideal mapping tool for the developing world. However, the cost of HRSI remains a significant factor limiting its application for large-scale mapping where metric tolerance are most stringent. Taking IKONOS imagery as an example, base-level, 15m accurate (CE90) Geo imagery sells for about $US 20/km 2 , whereas the 4m accurate Precision image product can cost upwards of $US 120/km 2 in Africa and Asia. A very attractive proposition for mapmakers in the developing world, therefore, would be to have the capability of generating the metre-level accuracy of Precision imagery at the price of base-level Geo imagery. This paper addresses the means to realize this prospect through discussion of the results of experimental testing of stereo IKONOS Geo imagery in Northern Thailand. Geopositioning accuracy to better than 1m RMS in planimetry and around 1.3m in height was achieved with very few control points. The technique of bias-compensated rational functions was applied, along with a second sensor orientation model, using 6-8 ground control points. This produced geopositioning accuracy that met map specifications at 1:10,000 scale. The paper highlights that lowest-cost HRSI products can meet the large-scale mapping needs of developing countries, thus leading to a more economical means of providing this important spatial data infrastructure component
关键词：Imagery; High resolution; Mapping; Accuracy; Orthorectification; Sensor; Orientation