Vegeation Parameters Retrieval Using Tm/etm+ Data, a Case Study in the Typical Semi-arid Steppe in Inner-mongolia, North China
نویسندگان
چکیده
Remote sensing technology is very useful in getting synoptic estimates of grass bio-parameters which is important for rangeland monitoring . The retrieval of bio-parameters is usually realized by developing empirical regression formula. However, it is less convincing if the regression line is built on limited observations from one growth stage . In this research, three field surveys were carried out at different periods in a growing season in the typical semi-arid steppe in North China. The correlation between bio-parameters (leaf area index, dry weight, canopy water content) and TM spectral data were studied with about 240 observation data. The objective of this research is twofold: to learn the temporal difference of the correlation between bio-parameters and spectral variables, and to find which bio-parameter can be determined most easily from spectral information.
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