Grayscale Mapping of Historically Irrigated LandsUsing GIS

作     者：Thomas C. Turney 

作者机构：Consulting Engineer Former State of New Mexico State Engineer 

出 版 物：《Journal of Geographic Information System》 (地理信息系统（英文）)

年 卷 期：2012年第4卷第1期

页      面：33-36页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：GIS Geo-Referencing Images Water Rights Irrigation Area Computations Grayscale Mapping 

摘      要：This document describes the use of grayscale mapping and GIS for identification of historical irrigated lands. Historical irrigated lands form the basis for water rights—a private property right in New Mexico that is bought and sold on the open market. Identification of irrigated land on historical photography is both a science and an art. Grayscale mapping of historic black and white photographs can aid in the identification of irrigated lands. GIS allows historical images to be geo-referenced and area computations to be performed on polygons that define the irrigated lands.