tailieunhanh - GIS Applications for Water, Wastewater, and Stormwater Systems - Chapter 3

Công Viễn thám 400 dặm vệ tinh trên mặt đất có thể giúp bạn xác định vị trí một đường ống bị rò rỉ? Đọc chương này để tìm hiểu. Landsat 7 Mapper chuyên đề nâng cao (ETM +) cảnh của khu vực Vịnh Chesapeake mua lại trên 05 tháng bảy 1999 (Hình ảnh lịch sự của USGS). | CHAPTER 3 Remote Sensing Applications Can a satellite 400 miles above the ground surface help you locate a leaking pipe Read this chapter to find out. The Landsat 7 Enhanced Thematic Mapper ETM scene of the lower Chesapeake Bay region acquired on July 5 1999 Image courtesy of USGS . Copyright 2005 by Taylor Francis LEARNING OBJECTIVE The learning objective of this chapter is to comprehend the applications of remote sensing technology in the water industry. MAJOR TOPICS Remote sensing satellites Applications of satellite imagery Types of remote sensing data Digital orthophotos Using remote sensing for land-use classification Image processing software Anticipated future trends LIST OF CHAPTER ACRONYMS DEM Digital Elevation Model DOP Digital Orthophoto DOQ Digital Orthophoto Quadrangle DOQQ Digital Orthophoto Quarter Quadrangle LIDAR Laser Imaging Detection and Ranging LULC Land Use Land Cover TM Thematic Mapper onboard Landsat satellite USGS United States Geological Survey ALBANY COUNTY S REMOTE SENSING APPLICATION Public-domain digital aerial photography data such as USGS digital orthophoto quadrangles DOQs and digital orthophoto quarter quadrangles DOQQs usually become outdated in rapidly developing areas. For such areas high-resolution satellite imagery may be a cost-effective source of more recent overhead images. Albany County located in southeastern Wyoming covers 4 400 mi2 has a student-based population of 30 000 and has 1 600 mi of roads. For rural communities such as Albany County building a GIS from scratch can be an expensive endeavor due to lack of resources. The County s day-to-day mapping functions required a data layer of imagery for the entire county. Various data options were reviewed including aerial flights existing DOQs and satellite imagery. New aerial imagery was eliminated because it was too expensive. Existing DOQs were not suitable because they were 7 years old and did not reflect recent county growth trends. In addition costs associated with