Questions tagged [vectorization]
The conversion of raster data (an array of cell values) to vector data (a series of points, lines, and polygons).
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QGIS .tiff to shapefiles by extracting colours
So I have the following raster file:
I would like to edit it so that I export all green, blue or purple areas as a single, new .tiff. Afterwards I would make a vectorization to be able to process the ...
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Removing additional lines from vectorized stream network
I have a large raster stream network (excerpt below) in QGIS that has been thinned using r.thin (light blue squares) and then vectorised using r.to.vect (pink lines). However, because some of the ...
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Automatic Vectorisation in ArcGIS
Is there any method or tool/model for ArcGIS to draw automatic line based upon raster data values.
E.g i have a DEM and i want to automatically generate a line feature passing through all those pixels ...
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Transforming a raster .png image to vector file
I have been working with FEMA flood maps to georeferenced and then digitize the maps by hand drawing polygons of the flood zone features. I have tried some workarounds to make the digitization process ...
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Convert a PNG file to a line layer in QGIS
I have a map in PNG-format that looks like this:
I have imported it into QGIS as a raster. I want to create a line layer as a network based on the blue and pink lines. Is there a way to create a line ...
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Fastest way to clip millions of small polygons and storing results as JSON [closed]
I have a dataset with couple million farm polygons (around 2.5 million and only expected to grow in the future), and I need to calculate the NDVI for these farm polygons, with some basic stats (...
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Converting vectorization (raster to vector) with small steps in values in QGIS
I have a raster file that contains water depths in m. The water depths are the only attribute and should be transferred to the vector layer.
The raster files have a cell accuracy of 1m x 1m. I would ...
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Extract a vector from a raster with a single boundary in QGIS
I have a "problem", I need transform a raster in a vector and it works but some pixels like the one in the print it is separated from the boundary, and for my use (a specific use of ...
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ReducetoVectors in Google Earth Engine not working with the Mollweide transformation. Need to calculate zonal statistics for global scale analysis
My study is a global-scale analysis of the factors driving forest gain, with grid cells as the unit of analysis. I need to calculate the amount of forest gain per ~65km2 hexagonal grid cell at the ...
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Creating a seamless vector dataset from raster with gdal, R or Python
I'm trying to create a seamless vector dataset from an integer raster. "Seamless" as in: not gaps between features and no overlapping features.
The tools gdal_polygonize, pkpolygonize, terra:...
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Generate points from raster image in QGIS
I'm hoping to generate a new vector file from select points from a raster image in QGIS. I don't know if it is possible.
For instance, I would like to generate a vector point file that puts a point ...
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QGIS geotrace languages from a given image of a map
I have a linguistic map of the Caucasus and I need to geotrace the languages that are on the map, preferably in QGIS.
Is there any way in which I can do it easily?
Here is the map:
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Convert topographic map to vector and text
I have a topographic map in TIFF format and I vectorized it in QGIS (3.22.0). For my project I needed the settlements, which I was able to extract. More importantly are the names of the settlement. ...
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GEE Export individual FeatureCollections as shapefiles from an image Collection
I have run an NDWI index for an Image collection and thres holded the results, which I want to import as individual FeatureCollections (shapefiles).
My code is of course longer, but teh most importan ...
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Differentiate vertical and horizontal shapes
I have the following shape file:
Each polygonal area (the lines are areas) is one feature in a single Shapefile.
Can anyone think of a simple method that can be implemented with qgis to separate the ...
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