Questions tagged [gdal-polygonize]
The gdal-polygonize tag has no usage guidance.
13
questions
2
votes
1
answer
77
views
How could I set 8CONNECTED into gdal.Polygonize()
I've seen in several web pages and examples the next snippet:
gdal.Polygonize(band, maskband, polygonizedLayer, ndField, [], callback=None) but I don't understand how to use the options parameter. In ...
3
votes
1
answer
148
views
Chain the output of gdal_polygonize to ogr2ogr
I am doing a two step process:
Polygonize a PNG raster via gdal_polygonize.py
Add a custom field named id
Upload the resulting vector to PostGIS via ogr2ogr
I am currently doing it in two steps, ...
- 91
1
vote
1
answer
139
views
no feature ID when polygonizing raster with python GDAL
I'm trying to polygonize the following binary raster:
The output is a polygon layer (ESRI shapefile) that looks good, however, doesn't have FIDs for the features and thus I am not able to iterate ...
- 81
2
votes
0
answers
246
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Polygonize tool error "Process gdal_polygonize.bat failed to start"
I am trying to use the Polygonize (Raster to Vector) tool on QGIS-LTR on Windows 11.
When I launch the tool on a layer I get the following error.
Input parameters:
{ 'BAND' : 1, 'EIGHT_CONNECTEDNESS' :...
- 21
1
vote
0
answers
160
views
QGIS - converting categorical raster to polygon includes raster boundary
I am using the QGIS Raster Convert Raster to Polygon tool (which calls gdal_polygonize under the hood), to convert a raster in a netcdf file to a polygon. The raster is a binary mask. The issue is ...
- 93
0
votes
1
answer
194
views
Unable to extract all points when converting TIFF file to shapefile using gdal_polygonize.py
UPDATE
I came to know that the gdal_polygonize.py is not the right tool for my purpose.
My aim is to convert the TIFF file to shapefile, so that I can get the elevation points. I already did the ...
- 47
1
vote
0
answers
74
views
Trying to run gdal:polygonize on all .img files in directory
In QGIS PY console, I'm attempting to run gdal:polygonize as a subprocess in order convert all files in a directory into ESRI shapefiles. Using the code below and receiving the error that follows.
...
- 11
2
votes
1
answer
289
views
gdal_polygonize not converting raster values
I am trying to convert a weather radar geoTIF to geoJSON using gdal_polygonize.
I am sharing the original .tif on google drive :
https://drive.google.com/file/d/1p2eE0QUtNypNjs5Qb9JBfXrDdMd8Ifpb/view?...
- 252
0
votes
1
answer
316
views
Gdal_polygonize and gdaltindex error
I'm trying to convert .tif file to .geojson using following cmd:
gdal_polygonize.py flowdirection.tif -f "ESRI Shapefile" flowdirection_shp.shp
After which I'm getting error:
Program '...
- 67
1
vote
1
answer
447
views
Converting .tif files to vector MBTiles by using gdal_polygonize
I am trying to use GDAL 2.2.2 and the gdal_polygonizecommand to convert a TIF into vector MBtiles from the link:
https://github.com/geostarters/gdal_snipets
I run the following command on the tif as ...
- 75
1
vote
1
answer
354
views
gdal_polygonize slow
I am trying to convert 1400 tiff files to GeoJson..tif file size ranges from 20 mb to 1Gb.
gdal_polygonize.py is taking 24 hours for Big files 5 hours for small files.
Any way to improve performance?
- 11
0
votes
0
answers
265
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Negative areas after polygonize in QGIS
I have been trying to convert this raster data using QGIS's Polygonize function: https://daac.ornl.gov/VEGETATION/guides/Decadal_LULC_India.html
The converted geopackage is returning many geometries ...
- 1
5
votes
2
answers
6k
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Converting raster pixels to polygons with GDAL python
I want to convert raster pixels to vector polygons as below image that is output of "Processing Toolbox--> Vector Creation--> Raster pixels to polygons" in QGIS 3.8:
I tried to do this vectorize with ...
- 1,046