GDAL / OGR安装测试

GDAL / OGR

测试GDAL/OGR是否安装

import sys

try:
    from osgeo import ogr, osr, gdal
except:
    sys.exit('ERROR: cannot find GDAL/OGR modules')

检查已安装的GDAL / OGR版本

import sys
from osgeo import gdal

version_num = int(gdal.VersionInfo('VERSION_NUM'))

if version_num < 3000400:
    sys.exit('ERROR: Python bindings of GDAL 3.04 or later required')

启用python异常

默认情况下，发生错误时，GDAL / OGR Python绑定不会引发异常。相反，它们返回错误值（例如None），并将错误消息写入sys.stdout。您可以通过调用UseExceptions（）函数来启用异常：

from osgeo import gdal

# Enable GDAL/OGR exceptions
gdal.UseExceptions()

# open dataset that does not exist
ds = gdal.Open('test.tif')
# results in python RuntimeError exception that
# `test.tif' does not exist in the file system

您可以在运行时的任何时候使用以下命令禁用GDAL / OGR异常：

from osgeo import gdal
gdal.DontUseExceptions()

安装GDAL / OGR错误处理程序

import sys

try:
    from osgeo import ogr, osr, gdal
except:
    sys.exit('ERROR: cannot find GDAL/OGR modules')

# example GDAL error handler function
def gdal_error_handler(err_class, err_num, err_msg):
    errtype = {
            gdal.CE_None:'None',
            gdal.CE_Debug:'Debug',
            gdal.CE_Warning:'Warning',
            gdal.CE_Failure:'Failure',
            gdal.CE_Fatal:'Fatal'
    }
    err_msg = err_msg.replace('\n',' ')
    err_class = errtype.get(err_class, 'None')
    print('Error Number: %s' % (err_num))
    print('Error Type: %s' % (err_class))
    print('Error Message: %s' % (err_msg))

if __name__=='__main__':

    # install error handler
    gdal.PushErrorHandler(gdal_error_handler)

    # Raise a dummy error
    gdal.Error(1, 2, 'test error')

    #uninstall error handler
    gdal.PopErrorHandler()

结果：

Error Number: 2
Error Type: Debug
Error Message: test error