tailieunhanh - GIS Applications for Water, Wastewater, and Stormwater Systems - Chapter 4

DEM ứng dụng Một thiết bị laser được gắn trong một máy bay có thể tạo ra một nền tảng GIS sẵn sàng bản đồ độ cao bề mặt của khu vực nghiên cứu của bạn hoặc đo độ cao hố ga của bạn? Đọc chương này để tìm hiểu. | CHAPTER 4 DEM Applications Can a laser device mounted in an airplane create a GIS-ready ground surface elevation map of your study area or measure the elevation of your manholes Read this chapter to find out. 1 250 000 USGS DEM for Mariposa East California plotted using DEM3D viewer software from USGS . Copyright 2005 by Taylor Francis LEARNING OBJECTIVE The learning objective of this chapter is to learn how to use digital elevation models DEM in GIS for water industry applications. MAJOR TOPICS DEM basics DEM data resolution and accuracy USGS DEM data DEM data from remote sensing technology DEM data from LIDAR and IFSAR technologies DEM analysis techniques and software packages DEM application case studies and examples LIST OF CHAPTER ACRONYMS 3-D Three-Dimensional DEM Digital Elevation Model DTM Digital Terrain Model ERDAS Earth Resource Data Analysis System IFSAR Interferometric Synthetic Aperture Radar LIDAR Laser Imaging Detection and Ranging Light Imaging Detection and Ranging NED National Elevation Detection and Ranging TIN Triangular Irregular Network HYDROLOGIC MODELING OF THE BUFFALO BAYOU USING GIS AND DEM DATA In the 1970s the Hydrologic Engineering Center HEC of the . Army Corps of Engineers participated in developing some of the earliest GIS applications to meet the H H modeling needs in water resources. In the 1990s HEC became aware of the phenomenal growth and advancement in GIS. The capability of obtaining spatial data from the Internet coupled with powerful algorithms in software and hardware made GIS an attractive tool for water resources projects. The Buffalo Bayou Watershed covers most of the Houston metropolitan area in Texas. The first recorded flood in 1929 in the watershed devastated the city of Houston. Since then other flooding events of similar vigor and intensity have occurred. During 1998 to 1999 the hydrologic modeling of this watershed was conducted using the Hydrologic Modeling System HMS with inputs derived from GIS. The .