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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28 views

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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1answer
36 views

Error in overlay - formula not vectorized

I've run into another error while trying to get my predictive model to work. My base model is basically done (extracting locational parameters from archaeological sites in an area, and calculating a ...
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1answer
51 views

Split single band layer in QGIS

I have a single band raster layer, namely the USGS Global Mountain Explorer Home K3 dataset. It is a 8 bit unsigned integer GeoTIFF of 200 Mb, with 4 grey values each corresponding to a mountain ...
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2answers
33 views

Two-value raster to generalized polygons (join pixels close together into one polygon) with short computation time in QGIS or ArcMap [closed]

I want to create application map for agriculture based on NDVI map. I have theoretical way how to do it. My raster has two values (1 - red, 0 - green), the raster is quite big (100 hectares with 6 ...
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1answer
34 views

Runtime problem gdal:polygonize processing algorithm

I have a c. 60 MB file containing the GTOPO30 30-arc second (c. 1 km) digital elevation model of Africa. The dataset is described here: https://databasin.org/datasets/2965da954b114ff3b47621e99e3b29ba. ...
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2answers
81 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 ...
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2answers
48 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,...
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1answer
268 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 ...
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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?
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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 ...
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29 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? ...
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1answer
57 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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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 ...
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1answer
39 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 (...
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144 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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201 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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53 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?
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113 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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1answer
47 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 ...
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1answer
704 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 ...
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1answer
356 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 ...
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1answer
350 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 ...
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1answer
374 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 ...
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1answer
62 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 ...
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2answers
798 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 ...
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147 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 ...
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1answer
448 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). ...
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1answer
332 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 ...
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109 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) - ...
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1answer
54 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 (...
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1answer
125 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 ...
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39 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 ...
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1answer
268 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 ...
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33 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
181 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): ...
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1answer
105 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 ...
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1answer
907 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 ...
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1answer
177 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 ...
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45 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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119 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 ...
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1answer
167 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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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 ...
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1answer
292 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 ...
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1answer
126 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. ...
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0answers
400 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 ...
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540 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 ...
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164 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 ...
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2answers
365 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 ...
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1answer
424 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 ...
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2answers
3k 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 ...