www.gusucode.com > map 案例源码 matlab代码程序 > map/PrecomputeTheSizeOfADataGridExample.m
%% Precompute the Size of a Data Grid % Before making a large, memory-taxing data grid, you should first % determine what its size will be. If you know the latitude and longitude % limits of a region, you can calculate the size of the raster % by creating a referencing object, for any desired map resolution % and scale. %% % Specify the latitude and longitude limits for the region. This example % calculates the size of a map of the continental U.S. at a scale of 10 % cells per degree. latlim = [ 25 50]; lonlim = [-130 -60]; %% % Specify the extent of the data grid using cells per degree. cellsPerDegree = 10; extent = 1/cellsPerDegree; %% % Construct a referencing object and verify that the size of the raster is % reasonable (in this case, 250 by 700 cells). R = georefcells(latlim,lonlim,extent,extent); R.RasterSize