Question

我构建了一个python脚本，用于从shapefile构造geotiff栅格。目前生成的geotiff不包含shapefile的空间参考。如何将shapefile中的空间参考复制到geotiff？我尝试通过以下命令将shapefile的空间参考复制到geotiff：target_ds.SetProjection（source_layer.GetSpatialRef（））
我认为与shapefile相关联的空间参考对象与geotiff不同，但是，不知道如何从一个到另一个。

# This code creates a raster from a shapefile.
# Every feature in the shapefile is included in the raster.

import os
import gdal
import ogr    

os.chdir(r'C:\Users\pipi\Documents\Rogaine\Tarlo\gpx')  #folder containing gpx files
vector_fn = 'gpxcollection.shp'  #filename of input shapefile
pixel_size = 25 #same unit as coordinates
raster_fn = 'test.tif'  # Filename of the raster Tiff that will be created

#______Open's the data source and reads the extent________
source_ds = ogr.Open(vector_fn)
source_layer = source_ds.GetLayer()  #returns the first layer in the data source
x_min, x_max, y_min, y_max = source_layer.GetExtent()

#______Create the destination raster file__________
x_res = int((x_max - x_min) / pixel_size)
y_res = int((y_max - y_min) / pixel_size)
# create the target raster file with 1 band
target_ds = gdal.GetDriverByName('GTiff').Create(raster_fn, x_res, y_res, 1, gdal.GDT_Byte)
target_ds.SetGeoTransform((x_min, pixel_size, 0, y_max, 0, -pixel_size))
band = target_ds.GetRasterBand(1)

#______Populates the raster file with the data from the shapefile____
gdal.RasterizeLayer(target_ds, [1], source_layer, burn_values=[1])

del target_ds  #flushes data from memory.  Without this you often get an empty raster.

Answer 1

根据the docs，GDAL dataset.SetProjection()方法需要众所周知的文本（WKT）或PROJ4字符串：“字符串应为OGC WKT或PROJ.4格式”。

您可以通过执行以下操作之一来实现此目的：

source_layer.GetSpatialRef().ExportToWkt()
source_layer.GetSpatialRef().ExportToProj4()

如何将空间参考从shapefile复制到geotiff栅格？

1 个答案: