Miaoran Duan

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Based on four sample point sets of 10 thousand (100*100), 250 thousand (500*500), 1 million (1000*1000) and 4 million (2000*2000), we test the space retrieval performance of MongoDB and ArcGIS in different sample quantity condition. The test results show that, after enabling spatial index, spatial retrieve performance of MongoDB is much better than ArcGIS,(More)
This study takes Jiangsu Province, and it chooses multi- source observation data and basic geographical information data as basic data, makes use of forest land's data in the sub-regional data, selects the forest land's monitoring indicators, and explores into the temporal and spatial changes of forests in Jiangsu Province from multiple perspectives,(More)
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