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Is there a Python program to convert raster to polygons?
I am seeking an open-source python solution to convert raster to polygon (no ArcPy). Nevertheless, I expect that the output can be shapely polygons or any object, temporarily in memory, not saved as a file. Is there any package or code to handle this issue?
What’s the difference between GDAL and polygonize in Python?
You are confusing the use of the gdal_polygonize command line utility with the python function gdal.Polygonize (). As you mentioned, you’ve managed to use the command line utility successfully; however, the Python function works differently and expects different arguments than those specified in the utility.
How to get the band object in GDAL?
To get the Band object you need to open the input file using gdal.Open () and use the GetRasterBand () method to get your intended band. Additionally, you need to create an output layer in which the resulting polygons will be created. The Python GDAL/OGR Cookbook has a good example on how to use this function.
What should the first argument be in GDAL?
The first argument should be a GDAL Band object, not a string, so this is why you get your error. To get the Band object you need to open the input file using gdal.Open () and use the GetRasterBand () method to get your intended band.
How to open a raster file in GDAL?
To open an existing raster file in GDAL, you would use the Open (…) function defined in the gdal module. The raster file we will use in the following examples contains world-wide bioclimatic data and will be used again in the lesson’s walkthrough.
How to rescale a raster file in Python?
GDAL also provides functions for manipulating raster files directly, such as gdal.Translate (…) for converting a raster file into a new raster file. Translate (…) is very powerful with many parameters and can be used to clip, resample, and rescale the raster as well as convert the raster into a different file format.