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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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 ...
Anomalous Exploration's user avatar
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54 views

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. ...
rtaani's user avatar
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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 ...
Daniel Falaschi's user avatar
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1 answer
52 views

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 ...
Mabignix's user avatar
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110 views

How to convert raster to vector by generating center lines?

I need to vectorize the raster by keeping one center line trough the boundary pixels. My solution would need to be very similar to this question: Converting raster to vector by generating center lines?...
Sass's user avatar
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Abrupt error when trying to run model with viewshed as batch process

I am trying to run the following model as a batch process. In summary, I take a DEM raster layer and a number of individual points as separate .gpkg files in a directory (these points have been ...
Nandula's user avatar
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Smoothing a vector layer in Google Earth Engine

I extract riverbanks out of Landsat images at Google Earth Engine. After the vectorization of my raster image I receive a shapefile of the riverbank with many unwanted vertices. How can I smooth the ...
Lennart G.'s user avatar
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33 views

Why r.to.vect process takes too much time with topology analysis?

My task is to vectorize a standard landuse map (PROBA-V discrete classification) for extent 118.747182 54.231218 124.946218 60.060467 degrees. Raster is too detailed for me, so I generalize it. I use:...
Nikolay Yasinskiy's user avatar
3 votes
1 answer
100 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, ...
illpack's user avatar
  • 91
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77 views

Using Deep Learning for historical maps?

I am attempting to train a deep learning model that will vectorize a scanned paper map of surficial geology. The features themselves are quite simple, but there are things like topo layers and ...
Darby's user avatar
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4 votes
1 answer
401 views

Vectorizing all pixels as separate polygons using rasterio

I use rasterio.features.shapes and use the geometry of pixels in raster data to create polygons for each pixel. Pixels with the same value merge these pixels if they are adjacent. What I want is for ...
geomaticpoly's user avatar
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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 ...
Mabignix's user avatar
1 vote
1 answer
368 views

What are strategies to simplify a vectorized raster layer?

For a GIS web viewer I am building, I plan to use large sets of vector data on coral reefs (source: Allen Coral Atlas). When viewing the downloaded data, it seems that the original source was raster ...
Sytze's user avatar
  • 721
2 votes
1 answer
244 views

Create clipping masks using contour lines in QGIS

I'm new to QGIS and GIS in general. I'm trying to find a way to create height layers automatically and then use them to clip other layers. In detail: Below is my area of interest. I have a raster ...
user215646's user avatar
1 vote
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Visualization and vectorizing for AI in Google Earth Engine

I'm glad to find this space, I come from a background in economics and do not know the first thing about GIS (hope to learn as I go with this project). I found an interesting dataset (https://...
Sebastian Nuñez's user avatar
0 votes
1 answer
361 views

Polygonize/Vectorize large raster

A raster(.tif) of 6.70GB needs to be converted into polygons. The raster is binary (0 & 1), currently I am using Polygonize (raster to vector) and its taking a considerable amount of time and the ...
N_LLC's user avatar
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7 votes
3 answers
341 views

Simplification by constrained anti-aliasing in PostGIS

I vectorized a raster data set, therefore, I'm facing a "steps" effect, or aliasing, due to the fact that the vectorization strictly follows the raster cells. So, the geometry is quite large ...
swiss_knight's user avatar
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Extracting raster outline to a vector geometry

I have a raster data set with an irregular outline (every value outside is NaN) in Python (loaded from rasterio v.1.3a3 ): I'd like to extract its outline to a vector shape, such as a Shapely ...
swiss_knight's user avatar
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1 vote
1 answer
121 views

Issues with vectorisation of thinned flow accumulation through r.to.vect on QGIS

I'm trying to produce a shapefile river network from a flow accumulation raster using the r.to.vect function and I've overcome some difficulties regarding bit depth and thinned raster. n.b. I don't ...
NorthSon's user avatar
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1 answer
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How to transfer simple GeoTiff data into a database

I'm trying to turn a relatively simple GeoTIFF file into a dataset readable by an API. End goal: Build a GET method for an API like /search_by_coordinates?lat=-73.1221&lng=44.4924 and get ...
Alexandre Toulemonde's user avatar
8 votes
1 answer
549 views

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:...
Ratnanil's user avatar
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149 views

Converting Raster into Vector in QGIS

I am in process of converting one raster file ( JBA Flood score) into Vector file But due to raster size ( Possibly) process seems endless i.e. even after 9 hours process still continue. Is there any ...
Raj's user avatar
  • 103
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2 answers
563 views

How to polygonize NDVI raster using GDAL?

I have raster with NDVI values. I would like to polygonize the raster to get vector where each polygon is a pixel. I have tried gdal.Polygonize as described in the documentation and that runs without ...
ReutKeller's user avatar
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2 votes
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111 views

Contour Polygon Alternatives on QGIS

I am trying various ways to make polygons from raster data using 1 m DEMs. I am using QGIS 3.16 Hannover I have tried vectorizing my data, which does work OK, but I would like smoother boundary lines ...
Erioderma's user avatar
  • 515
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0 answers
99 views

Symbol recognition on a scanned image (map)

I have a specific task and I'm looking for possible approaches. What I'm trying to do is this: I have a high resolution (600dpi) scanned, and georeferenced image of a map, and I need to be able to ...
RyanWestwind's user avatar
4 votes
1 answer
813 views

Seeking GIS tool to automatically extract polygon geometries from images

Let's say I have multiple png images like the following one: I'd like to find a way where I can automatically draw polygon geometries on this image. Something like the following: My expectation is ...
raylight's user avatar
  • 1,221
1 vote
0 answers
392 views

Draw polygon (vectorize) raster based on same colored pixels -- getting bad polygons

So, I have a TIF georeferenced map and a rather messy shape that I need to digitize. It is green but has a lot of holes in it that are light green color. So, I want to capture all green pixels and ...
Matija Kordic's user avatar
2 votes
1 answer
68 views

Scaling a soil profile Raster to georeference and vectorize Raster data

I have pictures of root patterns, where each root is marked by a point. We worked on soil profile walls, so there is no coordinate system to use as a basemap. I loaded it to QGIS and classified it ...
Katja's user avatar
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49 views

Conceptual question on comparing rasterized data with vectorized (polygons) data

I've got this doubt on how to best proceed with the following situation: I would like to compare two datasets, one (model_data) is a raster (NetCDF format), with lat, lon and time as coordinates, ...
Henrique's user avatar
1 vote
1 answer
232 views

Wrong features when exporting vectorized raster data to a file using GeoPandas after applying a filter and a dissolve operation

I have a raster file with black areas having a value of 0 and white areas having a value of 1, resulting from a visibility analysis: I vectorized this raster after loading it with rasterio: import ...
swiss_knight's user avatar
  • 10.1k
0 votes
1 answer
711 views

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 ...
livelovegis's user avatar
0 votes
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34 views

How is it that ArcMap and QGIS produce feature classes with different numbers of points and different coordinates from the same TIFF?

I have a 300m by 300m B&W TIFF map of Brazil, and I need to convert all the pixel values into a point feature class. When I do it in ArcMap using Raster to Point, I get a feature class with 92,054,...
Ryan Ma's user avatar
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0 answers
137 views

Google Earth Engine Reducing Landsat Global Inland Waters Raster to Vector

I'm trying to create a vector outline of the water areas of the Landsat Global Inland Water raster in Earth Engine. I get the error "Line 3: water.addBands is not a function" from the ...
sar's user avatar
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2 votes
2 answers
1k views

Vectorizing raster with values between 0 and 1 in QGIS

I am working on QGIS. I have a raster of EVI, in which values are comprised between 0 and 1. I need to vectorize this raster in order to make an intersection with another vector. My issue is that when ...
lea's user avatar
  • 21
1 vote
0 answers
29 views

Distance between two vector lines in each east-west raster row (in QGIS)

I have 2m-resolution raster LiDAR data of a marsh edge from two moments in time and I am trying to calculate how much the marsh has "retreated" between the datasets. I used the LiDAR data to ...
ltwp's user avatar
  • 11
0 votes
1 answer
221 views

r.thin (GRASS) not giving correct result

I have raster image of road feature. I want to extract line feature from it. So I run r.thin tool on it of parameter - { 'GRASS_RASTER_FORMAT_META' : '', 'GRASS_RASTER_FORMAT_OPT' : '', '...
Souvik Sankar Mitra's user avatar
6 votes
2 answers
249 views

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 ...
Tom Brennan's user avatar
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0 votes
0 answers
625 views

How can I vectorize contour lines from a DTM in QGIS?

I'm using QGIS 3.16. I am trying to do the following: Starting with a DTM model (geoTIFF format) I am computing the contour lines (100m) with QGIS. So far, so good. In order to import the results into ...
Matthias Ihl's user avatar
1 vote
0 answers
148 views

QGIS does not polygonize [closed]

I have a .tif which I want to have polygonized. I take the Raster/Conversion/Raster to Polygon. QGIS 3.12 starts the process but never ends (once I waited half an hour). I maybe don't see a mistake. ...
KerryKilian's user avatar
1 vote
1 answer
2k views

Creating a polygon from all raster values >0 in QGIS?

I have a raster layer with two values, 0 and 1. I want to create a polygon shape from all the 1 values. I expected the "raster to vector" tool to achieve this, but this created another grid ...
jserv's user avatar
  • 195
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0 answers
42 views

Raster Values into Gridded Polygons with Same Cell Size using ArcMap

I have data in the form of a raster with 1 km x 1 km cells. I need to transfer it into a vector polygon grid layer (USNG) which also has 1 km x km cells, but has divergence around UTM zones and does ...
Thomas K's user avatar
1 vote
1 answer
752 views

Using TIFF file in Intersect tool of ArcMap

I am attempting to do some geoprocessing with a CSV file and a TIFF file (trying to use the Intersect tool), but am experiencing some trouble with it. I can't seem to be able to input the TIFF file as ...
user173646's user avatar
0 votes
0 answers
47 views

FireCCI51 on Google Earth Engine: burnt area as shapefiles

How can I export my results as shapefiles (polygons) from the burnt area results (raster)? I intend to export these shapefiles to ArcGIS for further anlysis on a specific national scale. Link to ...
Ido S's user avatar
  • 1
2 votes
1 answer
1k views

Vectorize a raster TIFF based on its different class colors

I am using QGIS 3.16 and I have an int ratser tiff file, which shows classified land covers obtained from Sentinel-2. I need to create polygons over each class to classify and visualize each group in ...
Paris's user avatar
  • 591
0 votes
0 answers
206 views

Creating shapefile of a raster image in QGIS 3.6

I use QGIS 3.6 on Windows and I have been trying to convert raster images into shapefiles. I managed to do that for Digital Terrain Models only, using the conversion --> vectorize tool in the qgis ...
PlanetaryGeo's user avatar
1 vote
1 answer
703 views

Converting Raster to Polygon in ArcMap

I've prepared my Shapefile in ArcMap 10.7.1 by Raster to Polygon. When I am opening this shapefile in ArcMap its showing a rectangular polygon around the shapefile like this: When I select this ...
Muhammad Usman Saleem's user avatar
7 votes
1 answer
201 views

Optimizing identification of tree stand boundaries

I am working on a workflow to identify tree stand boundaries. My desired result is the blue lines - I know it will never be like that, but I need it to be as good as possible. My best result is the ...
DyndeMachine's user avatar
2 votes
2 answers
7k views

Extract cells above certain values of raster file

I have a very large raster layer and with the values for noise emission. I'd like to extract all cells which are above a certain threshold value (e.g. 50 db) and convert them to an ESRI Shapefile so ...
Yves's user avatar
  • 326
5 votes
2 answers
609 views

Identifying tree stand boundaries

I have a forest area, where I need to identify all the dividing lines between tree stands. I have a different amount of rastar files (RGB, NIR, DTM, DSM), and need an output with the boundaries as a ...
DyndeMachine's user avatar
1 vote
0 answers
67 views

Vectorizing a raster zone map without the lines turning into squares QGIS

Raster zone lines turn into squares after vectorizing my raster because of pixels between color zones QGIS
jack's user avatar
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