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How to take cell size per X,Y using simple python or GDAL or RASTERIO?
and hot to count how many pixels have my raster with some packages..

I have find some code but is pyqgis and I don't need this package :

ras  = QgsRasterLayer("C:/Users/myname/raster.tif")
pixelSizeX= ras.rasterUnitsPerPixelX()
pixelSizeY = ras.rasterUnitsPerPixelY()

print pixelSizeX
print pixelSizeY
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1 Answer 1

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47

With PyQGIS

ras  = QgsRasterLayer("raster.tif")
pixelSizeX= ras.rasterUnitsPerPixelX()
pixelSizeY = ras.rasterUnitsPerPixelY()
print pixelSizeX
2.11668210081
print pixelSizeY
2.11685012701

With GDAL

from osgeo import gdal
raster = gdal.Open('raster.tif')
gt =raster.GetGeoTransform()
print gt
(258012.37107330866, 2.11668210080698, 0.0, 163176.6385398821, 0.0, -2.1168501270110074)
pixelSizeX = gt[1]
pixelSizeY =-gt[5]
print pixelSizeX
2.11668210080698
print pixelSizeY
2.1168501270110074

With Rasterio

import rasterio
raster =  rasterio.open('raster.tif')
gt = raster.affine
print gt
Affine(2.11668210080698, 0.0, 258012.37107330866,
   0.0, -2.1168501270110074, 163176.6385398821)
pixelSizeX = gt[0]
pixelSizeY =-gt[4]
print pixelSizeX
2.11668210080698
print pixelSizeY
2.1168501270110074

Or (from sgillies)

pixelSizeX, pixelSizeY  = raster.res
print pixelSizeX
2.11668210081
print pixelSizeY
2.11685012701
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9
  • thank you very much,can I use GDAL or RASTERIO to take complete metadata one by one in specific variables like pixelSizeX,pixelSizeY?Because now I use some algorithms from GDAL and some from RASTERIO in the some function and my app is slowly I thing.
    – Chris Papas
    Jun 12, 2017 at 17:25
  • 1
    Yes, without problem, look at the Python GDAL/OGR Cookbook for example
    – gene
    Jun 12, 2017 at 18:48
  • 11
    Gene, better to do pxsz, pysz = raster.res with Rasterio.
    – sgillies
    Jun 12, 2017 at 20:06
  • 8
    Using Rasterio 1.0.15, gt = raster.affine should be gt = raster.transform
    – Aaron ♦
    Feb 5, 2019 at 5:03
  • 1
    With the new rasterio version (mine is 1.1.5), there is no raster.affine Instead, we need to use gt = raster.transform
    – beahacker
    Aug 31, 2020 at 15:52

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