文档介绍：数码照相法估算植被覆盖度研究
摘要
植被覆盖度作为反映地表信息的重要参数,一直是植被遥感领域的重要研究课题。测量植被覆盖度的方法有地表实测和遥感监测两种。近年来,利用数码相机测量植被覆盖度的方法被人们认可和推广。本文就采用数码照相法估算陕西省延安市吴起县的植被覆盖度。2005年8月,在吴起进行了数据采样,获取了当地的植被覆盖小样方地的照片。首先,运用 ENVI软件处理相片,获取各种地物的红、绿、蓝三种波段的波段值。对这些波段值进行分析,找出各种地物的红、绿、蓝三波段之间的规律。通过三种波段之间的规律,可以将图像简单的看成由植被和裸土两部分组成。根据像元二分模型原理求算植被覆盖度。从所求得的植被覆盖度的情况可以看出,吴起县的植被覆盖状况良好,其林草覆盖率得到了很大提高。
关键字:植被覆盖度,像元二分模型,数码照相法
The Method of Vegetation Fraction Estimation by Digital Camera
Urban and Rural Planning & Resource Management 02-1 Sun Dan-zhu
Supervisor Zhang Xue-xia
Abstract
Vegetation fraction is the important parameter to reflection the information of the earth’s surface information. It’s the important study subject of the vegetation fraction remote sensing. There are two methods to measure vegetation fraction, one is to measure the earth’ surface in person, the other is to measure the vegetation fraction by remote sensing. In recent years, the method of making use of the digital camera to measuring the vegetation fraction is popular more and more. The purpose of this paper is to measuring the vegetation fraction of Wuqi County, Yan’an City, Shanxi Province by digital camera. We sampled the date in Wuqi in August obtained the pictures of the vegetation fraction in region. At first, we use the ENVI software to deal with the pictures to obtain the values of the red、green and blue three bands. After analyzing the values we could obtain the law among those three wave bands. Pictures were prising of vegetation and naked land as simple. We can calculate the vegetation fraction by the dimidiate pixel model theory. From the obtained data can see that Wuqi County’s vegetation coverage situation is pretty good, and the forest and grass fraction has been greatly improved.
Key words: vegetation fraction, dimidiate pixel model, digital camera
目录
1 前言 1
植被覆盖度的定义 1
植被覆盖度的意义 1
植被覆盖度监测的应用 2
植被覆盖度检测方法进展 2
2 植被覆盖度的研究方法 4
地表实测 4
采样法 4
仪器法 4
目估法 4
模型法 5
遥感监测法 5