Questions tagged [vectorization]
The conversion of raster data (an array of cell values) to vector data (a series of points, lines, and polygons).
125
questions
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2answers
40 views
Converting raster to polygon through ModelBuilder?
I have a set of raster which I want to convert to the polygon.
Below is the model I prepared, but its showing below error.
I checked the error code, which explains Alter the name to remove any ...
0
votes
2answers
36 views
Custom vector data drawing
I'm trying to create a map for a fictional map. I'm using Leaflet to display the map, with tiles, different levels of zoom and so on.
Now I need to generate, to "draw", some vector data. Specifically,...
9
votes
1answer
177 views
Creating vector (with lines/polygons) from raster based on paper map in QGIS
For a task I have several maps created with GIS that look like the following:
I am mainly interested in the colored zones that aren't roads (red) or rivers (blue) and would like to turn these into ...
2
votes
0answers
40 views
QGIS is flipping my rasters when I vectorize them
I am using QGIS to vectorize some raster layers. I was able to do this fine a week ago, but now every time I use the vectorize tool, the resulting vectors are flipped upside down. Any suggestions?
4
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0answers
39 views
Telling gdal_polygonize.py how to interpret colors / what does the `DN` field mean
I have lots of raster files I am converting to polys with gdal_polygonize.py. All these images have a consistent palette which I'd like to map to an attribute in the resulting polygons.
On most ...
2
votes
0answers
27 views
Generate multiple polygons based on JPEG image?
I have a number of image files depicting polygons (the original shapefiles are lost). Is there a way to automatically create new polygons in GIS, based on the form of the shapes visible in the image?
...
1
vote
2answers
40 views
Load GeoTIFF band value into PostGIS
I am trying to upload a geoTIFF file into my PostGIS database. Using raster2psql, it works.
raster2pgsql -I -C -M *.tif -F -t auto mytablename > mytable.sql
psql -d mydatabase -f mytable.sql
...
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0answers
21 views
Refine Raster Layer / remove Color bleeding
I have a Raster layer of Population density in a low resolution.
These raster layer has color bleeding between the different population areas. Is there a way, to remove them in QGIS like color ...
3
votes
1answer
32 views
Finding external boundary of bunch of vectors (using R libraries)
I have vectorized raster as in the image. This is actually 1419 polygons in SpatialPolygons class object.
I'm looking for a method which would allow me to extract the one most external polygon (...
0
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0answers
49 views
How to get pixel per meter in MATLAB
I have a vector shapefile which is in unit of 'Meter' presenting boundary of overall Germany. I am converting it into raster format based on each pixel representing 300 Meters respectively.
After ...
2
votes
0answers
101 views
Converting historic map data (raster) into polygon format? [closed]
How do I convert historical buildings from map data (raster) into a polygon format?
The historic maps that I am referencing are the Sanborn Fire Insurance Maps. Here is the link to an example in case ...
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votes
0answers
93 views
Digitizing contour lines from a picture in QGIS
I have a map with isobaths (water depth), like in this picture, and I would like to digitize them. Is there any tool or procedure in QGIS that can recognize the lines in the picture and create a ...
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0answers
19 views
Using dangleTolerance in arcpy.RasterToPolyline_conversion?
When convering raster to polylines, I understood that I can specificy the minimum line length with dangle tolerance, but this does not seem to be working.
Is this not possible, or am I misusing the ...
0
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0answers
35 views
Polygon to Raster conversion: Raster shifted ~10m horizontally. How to fix?
I converted a number of polygons into a raster. The cell size is correct but the raster has shifted ~10m horizontally.
Is there an issue with my method or is there a tool I can use to fix this?
3
votes
0answers
83 views
Extracting GeoTIFF colours and adding to equal geometry shapefile
I have the following map in .png-format that I would like to replicate, but I cannot obtain the original data.
The map shows the current water supply vulnerability for local municipalities in South ...
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votes
1answer
41 views
Loading georeferenced map TIFF image into shapefile using ArcMap?
I need to add this Lake County townships map into a shapefile that contains other counties' townships. The shapefile's fields are: Township, Shape, Shape_Length, Shape_Area and County.
How can I do ...
1
vote
1answer
317 views
Converting large raster to vector?
I have a shapefile which contains 10.000 polygons and I want to know how many of them falls on a specific land use. Unfortunately, the land use map that I have to use is a raster map and not a vector ...
0
votes
1answer
150 views
Converting raster to vector in QGIS?
I have reclassed my data so show areas were wind speed is greater than 5m/s and were it is not.
I have converted this raster file to a vector file however it showing as one single colour and not ...
0
votes
1answer
176 views
Converting each Rastercell to its own Point-Vector, Google Earth Engine
Related Post
My goal is to perfectly obtain one vector point per raster cell, located at the Center of the RasterCell
Running .reduceToVectors() with the scale argument retrieves vector points, but ...
1
vote
1answer
167 views
Converting Raster to Vector, Google Earth Engine,
By running the code, one obtains:
FeatureCollection (Error) Image.reduceToVectors: First band ('x') of image must be integral.
I don´t understand this error. My goal is to convert the pixel values ...
1
vote
1answer
52 views
How do I turn a fog belt zone raster map into a geographic map of expected fog?
I'd like to make a map that shows the amount of fog by San Francisco neighborhood.
I'm using QGIS. I have some of the pieces:
a geoJSON file for each of the neighborhoods.
a raster map with a ...
1
vote
2answers
473 views
Converting raster to vector from multiple raster values?
I have a raster GeoTIFF with values from 0 to 255 representing intensities. I want to Vectorize this information, but in ranges of 25.
As an example, I want to create a layer in which polygon islands ...
0
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0answers
98 views
How to delete little geometries without hole in python script
I'm writing a python standalone script from a old PyQGIS script.
Input data is a raster of which I would like to delete little areas.
In the PyQGIS script, I vectorized it and used GRASS v.clean to ...
0
votes
1answer
322 views
Vectorizing large-scale binary layer in Google Earth Engine?
I would like to vectorize binary raster layers in Google Earth Engine in order to be able to use the geometry of the resulting FeatureCollection in other tasks (e.g. clipping data or similar things).
...
0
votes
1answer
210 views
How can I collect training samples using ee.Image.sampleRegions() and an existing raster layer in Google Earth Engine?
I would like to sample training data from some raster data source (e.g. Sentinel-2) based on labels extracted from an already available dataset (e.g. some binary layer or classification map) in Google ...
2
votes
0answers
88 views
Doing automatic vectorization in ArcMap?
I'm using ArcMap 10.6; ArcScan. I am trying to run an automatic vectorization on my .tif file. I've cleaned up my raster, and am doing Start Editing - Vectorization - Show Preview (looks good) - ...
2
votes
1answer
40 views
How to merge pixel values to the nearest maximum value based on area in a classified raster?
We have a raster image with 9 discrete values. Generated the image using SAGA's Terrain Analysis -> Morphometry -> TPI classification technique. Now, like to merge pixels which occupy certain area (...
1
vote
1answer
109 views
What algorithm was used for generation of this vector layer?
The second image is a raster layer and in the third image obtained vector layer is so accurate.
What algorithm would have been employed?
Normal methods doesn't give nearly equal vectorization.
I ...
2
votes
0answers
34 views
Completing dashed line shapefile feature that was created with ArcScan?
Using ArcScan to vectorize a raster floodplain boundary map, I have selected the area, run ArcScan in the area, to output a Shapefile of the line. ArcScan worked to create the line, and it is a dashed ...
1
vote
1answer
207 views
Vectorize raster
I'd like to vectorise the Natural Earth II raster in order to be able to change its colours and display it with as a vector map. Using gdal_polygonize.py won't help as it will create 1 polygon per ...
0
votes
0answers
30 views
v.surf.idw raster file conversion into a vector with same colours style
Is it possible to convert from raster to vector the raster file resulting from grass interpolation algorithm "v.surf.idw" coloured with the quantile method and maintain such colours in the vector file ...
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0answers
124 views
Error while converting raster into vector in QGIS
I am using QGIS 2.18.23 and trying to convert a raster file (.tif) into a vector file (.shp). But I am getting an unusual error:
2018-08-28T12:41:38 1 Traceback (most recent call last):
...
0
votes
1answer
91 views
Reclassifying Raster to Vectorize in ArcScan
I have a raster file featuring sidewalks for an entire city. I created this raster from polygons with the intention of using ArcScan to extract a centerline from the raster. I know that the raster has ...
0
votes
1answer
657 views
Raster to vector conversion in Google Earth Engine
I would like to convert a raster image into vector. My image is referenced to a specific zone (vect).
I'm working with Hansen dataset and in particularly the layer 'lossyear'. Raster image is from a ...
0
votes
1answer
133 views
Identifying /vectorizing / classifying cliff bands ArcMap
I am working in ArcMap 10.5. I'm trying to identify cliffbands throughout my county, and to assess their approximate height. I've found a source of 1 meter resolution LIDAR data, which I have ...
0
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0answers
38 views
Pulling Data off PNG map scan using ArcGIS Desktop?
I have scanned a map with several trade routes on it and georeferenced it on top of a hydrology (river system) map of the U.S. The scanned map is a PNG file.
How can I pull off the trade routes?
...
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0answers
103 views
Raster to Polygon Conversion with shift [closed]
The Raster to Polygon Conversion results in strange polygons. I must have changed something in the settings, but have no idea what it could be.
Does anyone can help?
The red line is the polygone ...
1
vote
1answer
125 views
Segmentation vs raster_to_polygon
So, I am looking into raster segmentation methods and I started having a few doubts about what I know abouth their technicalities.
I was wandering if there is a way to connect raster-to-polygon ...
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0answers
1k views
How to convert a raster to a line vector layer?
I would like to convert all values having the value 1 in a binary raster to a line vector layer. The following image shows the binary raster (value 1=white and 0=black):
The optimal output would ...
2
votes
1answer
238 views
Raster conversion to vector with multiple fields retained
I have a raster which I have successfully polygonised using:
raster / conversion / polygonise (raster to vector).
However, my raster has multiple fields (data columns) within it and I've only been ...
1
vote
1answer
109 views
Vectorizing missing nodes in QGIS?
I am trying to vectorize a raster with tree coverage information. I classified the data in 3 categories and now I am vectorizing the raster to make calculations and intersecting it with other layers.
...
1
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0answers
296 views
Can QGIS create Vector Polygons from Raster Data?
I normally use Esri, am new to QGIS, and don't know a lot of terminology and definitions.
I am working with georeferenced geologic maps. Each formation is coded with a different color or color ...
2
votes
0answers
489 views
Automatically creating polygon/lines vector from WMTS Raster Building Footprint using QGIS?
I have a WMTS layer "EMAP15" http://wmts.nlsc.gov.tw/wmts providing footprints as raster layer.
I am trying to create 3D LOD1 buildings in Sketchup, but I have to trace each building as vector lines ...
2
votes
0answers
154 views
Delineating coastline with panchromatic imagery
I have a panchromatic satellite image with a large coastline area and my goal is to delineate this coastline with a maximum accuracy and minimum amount of manual work. What is the best option to ...
1
vote
2answers
299 views
Error “generate features” with ArcScan vectorization
Windows 10, ArcGIS 10.4.1/ArcScene 10.4.1.5686
I have a geotiff that I pulled in from a pdf. I'm in an edit session of ArcScan and when I Show Preview, the output looks great. However, whenever I try ...
0
votes
1answer
372 views
How to create vector roads center lines from raster?
I need to know how to create roads vector center lines from raster using ArcGIS.
I have tried to use Iso Cluster Unsupervised classification tool to classify raster and set it to 30 classes. After ...
8
votes
2answers
2k views
Converting raster to vector by generating center lines?
I have a binary raster containing boundary pixels with the value 1 (white) and no-boundary pixels with the value 0 (black):
I would like to vectorize the raster by keeping one center line trough the ...
0
votes
0answers
33 views
Why point layer result (showed as pixel centers) in this PyQGIS code rotated?
I have a point vector layer that have a field data. I want to disaggregate this field data to a raster layer by distance. It means when we away from a point, value in each pixel have smaller value and ...
0
votes
1answer
486 views
Create polygons based on raster values
I have 4 raster layers contained in a raster stack within program R. The layers represent occurrence surfaces for two species in two seasons (i.e. species one summer and winter and species 2 in summer ...
1
vote
1answer
654 views
How to polygonise a binary raster with python?
I already asked this in StackOverflow, but maybe it's better here. I have a ndvi raster that I binarized (I put my threshold at 0.35) with a script python and I wanted to polygonize this raster, in ...
