Extract Lat/lon from Shapefiles
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I have a grid projected in a Cartesian coordinate where each point represents a portion of a terrain. And I'd like to know the distance between each of these points to the closest road.
These roads are in a shapefile, and the function I'm using ipdm needs a XY input (as my grid point in Cartesian coordinates). So, my thinking is somehow extract the lat/lon of the roads, convert to a projected coordinate, ad then use the ipdm .
Any thoughts?
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Chad Greene
2015 年 6 月 18 日
You should be able to use shaperead with the 'UseGeoCoords',false option to get roads in cartesian coordinates. Just make sure the projection associated with the shapefile is the same projection you're using for your data.
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Chad Greene
2015 年 6 月 24 日
I assume the road coordinates are in a structure array, so I wouldn't expect scatter(roads.X,roads.Y) to plot all the roads. What happens if you do
[X,Y] = polyjoin(roads.X,roads.Y);
plot(X,Y)
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