https://github.com/brektrou/rtl8821CU
usb无线网卡模式自动转换
2019年12月3日星期二
2019年12月2日星期一
gdal：shape文件添加面积属性
ogrinfo -al -so 2max_elements_0.shp
ogrinfo -sql "alter table \"2max_elements_0\" add column area real(20,3)" 2max_elements_0.shp
ogrinfo -dialect SQLite -sql "update \"2max_elements_0\" set area = ST_Area(geometry)" 2max_elements_0.shp
备注：
Because UPDATE is not supported in OGR SQL, you should update the table using the SQLite SQL dialect available in GDAL >= 1.10 with SQLite and SpatiaLite support.[1]
GDAL is internally using the Virtual Table Mechanism of SQLite and therefore operations like ALTER TABLE are not supported. [2]
ogrinfo -sql "alter table \"2max_elements_0\" add column area real(20,3)" 2max_elements_0.shp
ogrinfo -dialect SQLite -sql "update \"2max_elements_0\" set area = ST_Area(geometry)" 2max_elements_0.shp
备注：
Because UPDATE is not supported in OGR SQL, you should update the table using the SQLite SQL dialect available in GDAL >= 1.10 with SQLite and SpatiaLite support.[1]
GDAL is internally using the Virtual Table Mechanism of SQLite and therefore operations like ALTER TABLE are not supported. [2]
2019年11月12日星期二
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