[gdal-dev] Python API ReadAsArray axis order

[Chris Crook]

Hi

I am using the Python GDAL API and looking at a simple TIFF image with a test program:

from osgeo import gdal
dataset = gdal.Open('test-gdal.tif')
transform=dataset.GetGeoTransform()
nx=dataset.RasterXSize
ny=dataset.RasterYSize
data=dataset.ReadAsArray()
print(f"Raster xsize, ysize ({nx},{ny})")
print(f"ReadAsArray dimensions {data.shape}")
print(f"GeoTransform: {transform}")

The output is:

test_python_api.py
Raster xsize, ysize (3,4)
ReadAsArray dimensions (4, 3)
GeoTransform: (22.15, 0.7, 0.0, -69.5, 0.0, 1.0)


I am confused that the array appears transposed from the raster x,y size.

Is this always the cased.  As far as I can tell the geotransform is assuming x,y (0-2,0-3 values) to map indices to location, which is what I want to do.

Can I assume that the array is always transposed?  Or if not how do I identify when this is the case?

Many thanks in advance

Chris Crook
Land Information New Zealand






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