Implementation of Perpendicular Drought Index in Remote Sensing Supporting System

The main objective of this paper is the implementation of Perpendicular Drought Index (PDI), a simple, effective drought monitoring tool, in integrated remote sensing supporting system (IRSSS) for parameter retrieval and drought estimation. According to the COM rule, the IRSSS developed a particular interface in order to guarantee the users add new function module or file I/O driver by themselves. This paper introduces the implementation of PDI using C++ program language. There are four steps designed to complete the task. The general process and purpose of every step is explained and especially the method of finding soil point and memory management is introduced as the key technology. The paper also presents the results of evaluated drought situation of Ningxia Huizu Autonomous Region of China that indicates accordance with regional hydro-environmental data.