Fig. 1. Geohash grid division and encoding

Fig. 2. Administrative division grid and coding

Fig. 3. Data storage flow diagram

Fig. 4. Data retrieval flow diagram

Fig. 5. Functions of ecological environment grid software

Fig. 6. Distribution of straw burning points in different levels of grid

Fig. 7. Distribution of reservoir points in different levels of grid

Fig. 8. Distribution of dust pollution sources points in different levels of grid

Fig. 9. Efficiency comparison among R tree， Quadtree and Geohash