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Residential areas are the gathering of human activities. It has great significance to master the spatial distribution information timely and accurately by RS in disaster assessment, urban expansion and environmental change research. In this paper, taking Longkou city as an example, we find corresponding models to quickly extract residential areas by studying the image features, spatial features and...
To study HCHs and DDTs contents and their spatial distribution in the agricultural soil of Shanghai suburb, the residue amounts of HCHs and DDTs in 2413 surface soil samples were determined. The results showed that concentrations of HCHs ranged from 0 to 1.000 mg/kg and DDTs ranged from 0 to 3.000 mg/kg, with occurrence of 88.3% and 98.3%, respectively. The cumulate ratios of soil samples with HCHs...
This article constructs the integrated evaluation system on the basis of GIS secondary development. Through spatial expression ability of GIS, we make overall situation of water quality and variation tendency more clear to the administrators. For different years and monitoring sections, through the menu, we can easily obtain monitor water quality values from backstage supported database, and calculate...
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