원문정보
초록
영어
In order to study the difference in lake water area derived from satellite images with different resolutions, the lake distribution maps with 30 m, 250 m and 500 m spatial resolution were derived from HJ-1A/B and MODIS data acquired in the same period. It is showed that the area estimates derived from both 250 m MODIS and 500 m MODIS have strong correlations with those derived from HJ-1A/B data for lakes with area larger than 10 km2. And 500 m MODIS data can get nearly the same estimates as 250 m MODIS data. For further analysis of the difference in lake water area, those lakes were divided into three groups according to the shape indices of lake water body, which were calculated with the results extracted from HJ-1A/B imagery. Taking HJ-1A/B lake maps as reference, it is found that the error of estimates from MODIS data increases when the lake area decreases and the shape complexity increases.
목차
1. Introduction
2. Data and Study Area
3. Methods
3.1. Lake Water Body Mapping with HJ-1A/B Imagery
3.2. Lake Water Body Mapping with MODIS Imagery
3.3. Shape Index Calculation for Lake Surface
4. Results and Discussion
4.1. Lake Water area Derived from HJ-1A/B and MODIS
4.2. Effects of Water Body Shape and Spatial Resolution on Lake Water Area Extraction
5. Summary and Conclusion
Acknowledgments
References