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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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0answers
23 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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2answers
34 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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20 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 ...
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1answer
30 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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30 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 ...
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71 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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47 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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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 ...
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32 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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72 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
37 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
181 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
103 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
115 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
119 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
43 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
337 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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0answers
74 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
246 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
124 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
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0answers
78 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
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1answer
37 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
101 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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0answers
30 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
187 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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28 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
94 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
78 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
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1answer
538 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
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1answer
96 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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0answers
36 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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89 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
101 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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940 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
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1answer
197 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
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1answer
101 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
262 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
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0answers
439 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
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0answers
152 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
272 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
337 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
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 ...
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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 ...
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1answer
441 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 ...
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1answer
576 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 ...
8
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2answers
308 views

Estimating resolution of vector data?

I got an old vector dataset with polygons covering a continent. The data was first published on paper at scale 1:5 000 000 and was later digitalized. I don't have the original data and no information ...
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1answer
43 views

Attributes of polygons in a shapefile based on largest area intersection with polygons from a different shapefile [duplicate]

I have a shapefile of landcover. It was developed from a raster dataset (the Crop Data Layer). I also have a grid of 50x50m cells (polygons in a shapefile) I have overlain on the landcover shapefile....
1
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1answer
599 views

Raster to polygon fails in ModelBuilder iteration

I need to vectorize some rasters to polygons and to do so, I use the "Raster to Polygon" tool in ArcGIS. As there are many rasters, I use a iteration in ModelBuilder. The output workspace is a ...
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0answers
117 views

Shapefile filling

I converted a raster into a shapefile. When I set no filling I see the contours of the different forms within the shapefile. When I set a filling, the whole file is filled, not only the shapes inside. ...
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0answers
29 views

Creating new symbology to be used for ArcMap?

I have a copy of scanned paper that has all the allotment may symbology that I am going to need them to add them to ArcMap 10.3.1. I have done creating new symbols that I worked on from my Ski Area ...