Land Use 2000

Every five years, since 1990, the Delaware Valley Regional Planning Commission has produced a GIS Land Use layer for its 9-county region. In 2000, digital orthophotography was flown by DVRPC. Utilizing this orthophotography, all Land Use annotation and digitizing was performed on-screen, or "heads-up," a first at DVRPC. Digitizing was done using ESRI ArcGIS 8 software at a 1:2400 (1 inch = 200 feet) scale.自1990年起，特拉华谷区域规划委员会（Delaware Valley Regional Planning Commission，简称DVRPC）每五年便会为其下辖的9个郡制作一套地理信息系统（Geographic Information System，GIS）土地利用图层（Land Use layer）。2000年，该委员会完成了对应区域的数字正射影像航拍工作。依托此次航拍获取的正射影像，所有土地利用标注与数字化作业均采用屏幕联机作业（即‘heads-up’）模式开展，这在特拉华谷区域规划委员会的作业历史中尚属首次。本次数字化作业采用ESRI ArcGIS 8软件完成，作业比例尺设定为1:2400（1英寸对应200英尺）。