Extraction of Vegetation Cover Rate in Urban Areas Based on Mixel Analysis and Its Relationship with Vegetation Indices
- Paper number
IAC-05-B1.6.04
- Author
Dr. Shoji Takeuchi, Hiroshima Institute of Technology, Japan
- Year
2005
- Abstract
This paper reports the experimental results for extracting vegetation cover rate (VCR) in urban areas based on mixel analysis and those for investigating the relationships between VCR and several kinds of vegetation indices. A linear mixel model was employed for estimating percent occupation of vegetation and non-vegetation categories. Two sub-categories were considered for each of vegetation and non-vegetation categories, forest and grass for vegetation, and building and bare soil for non-vegetation. Optimal VCR was estimated based on least-square estimation using six spectral bands of Landsat-TM/ETM+ data together with an iterative procedure in which the mixture rates of two sub-categories are varied by ten percent for vegetation and non-vegetation respectively. Finally a total VCR map of Hiroshima-city was created and the average VCR of Hiroshima-city was estimated. Then the relationships between VCR extracted above and several vegetation indices were investigated. Normalized difference vegetation index (NDVI) and three features derived by Tasseled-cap transformation, Brightness, Greenness, and Wetness, were selected for comparison with VCR. As a result, NDVI was the highest correlation and Greenness the secondary highest, however, Wetness was much lower correlation compared with the formers. This result is considered to verify the physical meanings of NDVI and Greenness experimentally.
- Abstract document
- Manuscript document
IAC-05-B1.6.04.pdf (🔒 authorized access only).
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