tailieunhanh - Remote Sensing and GIS Accuracy Assessment - Chapter 14

Đánh giá tính chính xác của bản đồ chuyên đề thường bị bỏ qua. Với sự phổ biến ngày càng tăng và sự sẵn có của các hệ thống thông tin địa lý (GIS), bản đồ có thể dễ dàng được sản xuất đối với chính xác tối thiểu cho. Thông thường, một bản đồ mà có vẻ tốt được giả định là chính xác 100%. | CHAPTER 14 Fuzzy Set and Spatial Analysis Techniques for Evaluating Thematic Accuracy of a Land-Cover Map Sarah R. Falzarano and Kathryn A. Thomas CONTENTS Accuracy Analysis of Reference Binary Fuzzy Set Spatial Reference Data .192 Binary Analysis .192 Fuzzy Set Analysis .192 Spatial Analysis .194 Results. 196 Binary Fuzzy Set Analysis .196 Spatial Analysis .196 Summary .204 References .204 Appendix A Arizona Gap Analysis Classification INTRODUCTION Accuracy Assessment Accuracy assessments of thematic maps have often been overlooked. With the increasing popularity and availability of geographic information systems GIS maps can readily be produced with minimal regard for accuracy. Frequently a map that looks good is assumed to be 100 accurate. 189 2004 by Taylor Francis Group LLC 190 REMOTE SENSING AND GIS ACCURACY ASSESSMENT Understanding the accuracy of meso-scale 1 100 000 to 1 500 000 scale digital maps produced by government agencies is especially important because of the potential for broad dissemination and use. Meso-scale maps encompass large areas and thus the information may affect significantly large populations. Additionally digital information can be shared much more easily than hard-copy maps in the rapidly growing technological world. Finally information produced by public agencies is freely available and sometimes actively disseminated. These combined factors highlight that a thorough understanding of the thematic accuracy of a map is essential for proper use. A rigorous assessment of a map allows users to determine the suitability of the map for particular applications. For example estimates of thematic accuracy are needed to assist land managers in providing a defensible