陕北黄土丘陵区地物光谱测试与特征分析

Characteristic Analysis and Determine of Land Surface Spectrum Features in the Loess Hilly Area in North Shaanxi

文章介绍了野外地物光谱的测试方法与结果,利用WDS—Ⅱ型微电脑双光路光谱议,模拟睦地卫星TM1、2、3、4通道,对农作物、天然草地、人工草地、土壤与基岩、水体等目标物进行了测试,共测目标点130个。测试表明,所有目标物与TM都有良好的波谱响应关系,其中TM_4通道的近红外区,反射率普遍提高。同时发现有水土保持措施与无措施的相同农作物,生长旺盛的沙棘、沙打旺与其它植物,以及犁耕地与未犁耕地反射率都存在明显差异。这些光谱特性与规律对水土保持遥感应用有重要意义。

This paper introcluces method and results of land surface features determined by WDS-Ⅱ type spectrum instrument. The WDS-Ⅱ type spectrun instrument was used to simulate TM1,2,3, 4 passageway of Landsat in order to measure crops, natural and man-made grassland, soil and base rock, water bady etc. The results show that total targets have a good spectrun relatiom with TM. In near infrared ray region of TM 4 passageway, reflective rate is raised in general. Meanwhile, we discovered that reflective rate of crops with or without soil and water eoservation measures, growth flourishing H. rnamnoides, A. adsurgens and other plants, and plough land and non-plough land are obvious different. These spectrum features and laws are important for remote sensing application of soil and water conservation.