Creation of projection metadata file (*.prj) for shapefiles

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Melanie VT
Melanie VT 2023-2-27
评论： Melanie VT 2023-7-6
Dear All,
The in-built shapewrite function creates three output files: [basename '.shp'], [basename '.shx'], and [basename '.dbf']. There is no option to export the projection metadata (.prj) file, whose absence causes a crucial problem while using the shapefile in the GIS software environment. Is there any workaround to create a projection metadata (.prj) file in MATLAB?
Cheers,
Mel
  2 个评论
Melanie VT
Melanie VT 2023-6-30
I could also find nothing in other forums @PADMAKAR. I thought it might be added in the R2023a, but unfortunately, it didn't. Fingers crossed for future versions😊

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Kojiro Saito
Kojiro Saito 2023-7-6
As of R2023a, shapewrite does not create .prj file, so you need to create it with wktstring and writematrix.
Here is a sample.
shp = shaperead('boston_placenames.shp');
shpInf = shapeinfo('boston_placenames.shp');
% Create .shp, .shx and .dbf files
shapewrite(shp, 'out.shp')
% Create Well-known text string
wkt = wktstring(shpInf.CoordinateReferenceSystem);
% Create .prj file
writematrix(wkt,'out.prj','FileType','text', 'QuoteStrings', false)
Now R2023b Prerelease is open and shapewrite will support creating .prj file.
[Prerelease Documentation] Mapping Toolbox Release Notes

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