Questions tagged «ogrinfo»

3
使用GDAL计算shapefile中多边形的总面积?
我在英国国家网格投影中有一个shapefile: Geometry: 3D Polygon Feature Count: 5378 Extent: (9247.520209, 14785.170099) - (638149.173223, 1217788.569952) Layer SRS WKT: PROJCS["British_National_Grid", GEOGCS["GCS_airy", DATUM["OSGB_1936", SPHEROID["Airy_1830",6377563.396,299.3249646]], PRIMEM["Greenwich",0], UNIT["Degree",0.017453292519943295]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",49], PARAMETER["central_meridian",-2], PARAMETER["scale_factor",0.9996012717], PARAMETER["false_easting",400000], PARAMETER["false_northing",-100000], UNIT["Meter",1]] cat: Integer (9.0) 我可以使用GDAL / OGR来获取shapefile中所有多边形的总面积(以公顷为单位)吗? 我想知道是否可以使用-sql,例如: ogrinfo -sql "SELECT SUM(ST_Area(geom::geography)) FROM mytable" myshapefile.shp 但是,尝试让我得到ERROR 1: Undefined function 'ST_Area' used.。 我想我可以将Shapefile导入QGIS,为每个多边形添加一个area属性,然后对其求和,但是如果可能的话,我宁愿使用命令行工具。
11 gdal  ogr  area  ogrinfo 
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