geospatial standards fgdc federal geographic data committee geospatial standards open machine-readable data format linked data semantic web swg charter iso 19115-1:2014 incits/iso 19115-1:2014[2014] incits/iso 19157:2013[2014] fgdc standards wg iso 19157:2013 standards development voluntary consensus standards geographic standards reference models spatial data infrastructure gis
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