彩色红外航空遥感技术在西藏农田非耕地系数测算中的应用研究与实践

西藏自治区的耕地多分布在藏东、藏南河谷地带,多数耕地地块破碎,形态各异,并且有大量的非耕地成分混杂其间,即使采用大比例尺图件,也难以测量准确的耕地面积。为准确查清耕地面积,在西藏土地资源调查工作中,独创地采用了彩色红外条带航空摄影,计算机图像处理系统求算彩色红外航空像片耕地样地中非耕地系数值和建立不同地貌、不同耕地类型非耕地系数检索表等系统的方法。该方法已在全藏调查工作中普遍推广,提高了调查精度,缩短了调查时间,大大减少了人力和经费投入。该项研究为我国山区耕地面积调查提供了有效的手段。

The Study and Practice on the Application of Colour Infrared Aerial Remote Sensing Technique to Non-cultivation Coefficient Calculation in Tibet

The cultivated land of Tibet Autonomous Region is distributed mainly in the river valleys of the east and south Tibet. Most of the cultivated fields were scattered in broken pieces, which, varying in their different pattens, mix up a large quantity of non-cultivated components. And therefore, it is difficult to measure the accurate areas under cultivation even with larrge scaled data. In order to make thorough investigation, the systematic methods were adopted creatively which includes (1) taking sampling strip aerial photographs; (2) calculating the value of non-cultivation coefficients of sample fields in the infrared colour air-photos by digital image processing system; and (3) Setting up the non-cultivation coefficient indexing table in different geomorphologic conditions and types of cultivated lands, etc. The methods that have been spreaded in the investigation of whole Tibet, have improved the investigation accuracy, shortened the time and redused the expens of manpower and funds. The study also provided efficent methods to investigate the cultivated areas in other mountainous regions in China.