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Liu Fuyuan (Beijing Agricultural Univ.)Li Zengyuan (The Resource & Information Institute,Chinese Academy of Forestry)  
Since 1970s,remote sensing techniques have developed fast and have been applied to a lot of subjects,such as geology,geography,soil,forestry and gra-ssland science.The application of it to grassland resource investigation is to sur-vey the types,distributions,quantities and qualities of grassland.Comparing to the post methods of investigation,there are many advantages to investigate grassland resource using remote sensing techniques.First,it,can shorten the investigation period.Second,it,can simplify the technological processes of grassland resource mapping and sparingly use manpower and material resources.Third,it can increse the accuracy of grassland investigation.The identifying possibility of grassland types and the interpretation reliability of areas have been incresed with the development and application of the Landsat 4-5 image data.In particular,the treated images using Ratio of TM Original Bands and TM Tasseled Cap have very high resolution,and the interpretation percision of them completely accords with the demands of large grassland investigation.
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