Method for calculating land homogeneity based on open source spatial database PostGIS

The invention provides a method for calculating land homogeneity based on an open source space database PostGIS, and the method comprises the steps: importing a current land into the PostGIS database,and carrying out the two-dimensional processing and effective inspection of the transferred current land; creating a square grid by using the convex polygon externally connected with the land parcel;performing spatial superposition on the grid element layer and the current land to generate a superposed polygon; wherein the superposed polygon has the identification code and area of the grid polygon and the land property of the land parcel; calculating land types with dominant areas in each grid to obtain dominant land types in each grid; and calculating the homogeneity value of each grid to obtain the homogeneity of each grid unit. Compared with the traditional method for calculating the homogeneity of the land parcel based on the combination of a plurality of pieces of software, the calculation process is based on a PostgreSQL and a space expansion module PostGIS single platform thereof, the data calling time between different pieces of software is reduced, the operation efficiency is greatly improved, the operation speed is improved by more than 10 times compared with the conventional operation speed, and the homogeneity of the urban land can be quantitatively calculated efficiently and quickly.