I'm trying to rastrize a shapefile that I have. I read the shape using GeoPandas. I would like to give the new raster values based on the shape column called "class" which has numerical class value based on another field : enter image description here
I have tried to do this process using rastrize with the following function:
def rasterise_me(raster, vector, attribute,
fname_out="", format="MEM"):
"""Rasterises a vector dataset by attribute to match a given
raster dataset. This functions allows for the raster and vector
to have different projections, and will ensure that the output
is consistent with the input raster.
By default, it returns a handle to an open GDAL dataset that you
can e.g. `ReadAsArray`. If you want to generate a GTiff on disk,
set format to `GTiff` and `fname_out` to a sensible filename.
Parameters
----------
raster: str
The raster filaname used as input. It will not be overwritten.
vector: str
The vector filename
attribute: str
The attribute that you want to rasterize. Ideally, this is
numeric.
fname_out: str, optional
The output filename.
format: str, optional
The output file format, such as GTiff, or whatever else GDAL
understands
"""
# Open input raster file. Need to do this to figure out
# extent, projection & resolution.
g = gdal.Open(raster)
geoT = g.GetGeoTransform()
nx, ny = g.RasterXSize, g.RasterYSize
srs = g.GetProjection()
min_x = min(geoT[0], geoT[0]+nx*geoT[1])
max_x = max(geoT[0], geoT[0]+nx*geoT[1])
min_y = min(geoT[3], geoT[3] + geoT[-1]*ny)
max_y = max(geoT[3], geoT[3] + geoT[-1]*ny)
# Reproject vector to match raster file
vector_tmp = gdal.VectorTranslate("", vector, format="Memory",
dstSRS=srs)
# Do the magic
ds_dst= gdal.Rasterize(fname_out, vector_tmp, attribute=attribute,
outputSRS=srs, xRes=geoT[1], yRes=geoT[-1],
outputBounds=[min_x, min_y, max_x, max_y],
format=format, outputType=gdal.GDT_Int32)
return ds_dst
but I always get the same error:
AttributeError Traceback (most recent call last) in ----> 1 rasterise_me("path\to\tiff.tif", "path\to shape.shp", "class") in rasterise_me(raster, vector, attribute, fname_out, format) 28 # extent, projection & resolution. 29 g = gdal.Open(raster) ---> 30 geoT = g.GetGeoTransform() 31 nx, ny = g.RasterXSize, g.RasterYSize 32 srs = g.GetProjection() AttributeError: 'NoneType' object has no attribute 'GetGeoTransform'
I don't really understand why I get this error and how can I solve it
My end goal: To create new raster based on my shapefile class values. If any more information regard what I did before is needed I would love to give it, but unfortunatly can't share the shapefile.
1 Answer 1
In the end what solved it was to add r before the name of the path
e.g :
r"this/is/my/path/image.tif"
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