Questions tagged [vector]
A coordinate-based data model that represents geographic features as points, lines, and polygons.
1,810
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Fix invisible Vector Tile Layer from OS Data Hub (UK)
I have followed the instructions on this page (top answer: Connecting QGIS to OS Vector Tile API) to get the vector data from OS Data Hub to load. However, I see nothing in the map viewer. I've ...
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45
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Rule-based symbology label to map labelling
How to import values from 'label' in symbology window to showing them as particular labels (QGIS 3.22)? I suppose it can be done with some short, clever expression in labelling window.
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Create vector layer/virtual layer with dynamic number of features in QGIS
The problem
I want to create a vector layer in QGIS 3.26 with a varying number of features. The number of features should be the same as the number of raster layers open in the project. So if I have ...
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Extract subset of linestring based on distance
I have two datasets, one containing a single linestring representing paths, one with several points representing hubs intersecting the linestring (or: one with roads, one with houses sitting "on&...
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I am importing layers from a DWG file into QGIS, and they are visible in the "Layers" panel, but they are not visible in the layout
I am very new to QGIS. I have a DWG file containing vector layers and I am using Project>Import/Export>Import Layers from a DWG/DXF. Some layers are then visible in the map, but others are not. ...
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3
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43
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Hiding edges in QGIS vector symbology
I have a vectorized layer of slope percentages that I want to visualize with a gradual color change without showing the black edges between different values.
I managed to do a color gradient ...
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Numbering polygons in a vector file in a particular order [duplicate]
I have a vector dataset containing only polygons. The polygons represent landslide locations with a large regional area - there are at present 2000 data points.
I would like to number each polygon ...
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42
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Delete parallel lines to calculate total network length [closed]
I have problem with parallel lines in QGIS. I want to delete lines, which have common courses with others (expample of lines is in the picture below) .
Context: The lines are network-lines and to ...
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QGIS Tile Index from raster content not extent?
Is there a way to create a tile index from the raster content and not the extent?
Here shows the default QGIS create tile index result :
I would like the polygon to follow the outline of the skewed ...
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36
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Separate a buildings' polygons shapefile layer into single layers of the single exctracted building in QGIS
I'm new here in QGIS.
I have a shapefile layer composed of polygons, that represents the rooftop buildings of my case of study. I'd like to "exctract" every single building from my shapefile ...
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Whats wrong with rasterize my polygon file?
I have manually digitized geological formations of a geological map as shown below.
I want to rasterize it but when im using rasterize tool and write my pixel units or georeferenced units didnt work....
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What could go wrong when merging multiple GeoJSONs?
Attempt I - ogrmerge
I have a few GeoJSONs in a directory called jordsmonnfiles. I want to get one GeoJSON file with the features from the files matching the pattern jordsmonnfiles/jordsmonn_*JK1....
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Is there an equivalent to the "Midpoint" tool in ArcGIS in QGIS?
I have a geopackage layer in QGIS which contains block outlines for parcels of land. They have been digitised with a gap between each block but the edges of adjacent polygons should actually share an ...
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How do I calculate population within radius on Google Earth Engine?
I'm trying to calculate the population within a specific radius within a specific country using Google Earth Engine. My plan is to use reduceToVectors to convert the population values into a ...
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Maptiler and OpenLayers marks don't work well together
I am trying to use Maptiler together with OpenLayers. I followed the instructions in MapTiler site and cannot make the markers to show properly over the map. What happens is that the map features (...
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Issue with GRASS tool r.to.vector
I'm trying to obtain quality vector data from a JPEG raster file of a cadastre area in the Netherlands. I thinned the raster with the GRASS thin tool and also filled it with the fill tool, but when I ...
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Concatenate points values in a field of a line
I'd like to know how to concatenate points values (attribute data), using fields calculator of QGIS, putting this concatenation in a new field of the linear feature which connect some points of these.
...
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QGIS - Does the Coordinate reference systems of two vectors/shapefiles matter if they are the same or not? [closed]
I have two polygon shapefiles. It says in the information properties that the CRS IS EPSG 4326 and the other one says the CRS is a custom one (I put this custom one). Since these are shapefiles, ...
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Viewing tiles created from GeoJSON in Leaflet/Mapbox
I have some zxy tiles built with tippecanoe that I can load into QGIS by setting a remote connection in the Vector Tiles tab to the url where the files are kept. However, I can not load them into my ...
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QGIS - Converting Vector to Raster and back to vector to resample resolution of vector data
I would like to convert my polygon data into a raster file to change the pixel resolution and then would like to convert it back to polygon data since this will allow it to be resampled to another ...
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Display vector points in MapBox from S3
I have a shapefile with around 14 millions points that I want to display in MapBox on a web application. The only documentation around displaying points I can see is by using MapBox tiling service, ...
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2
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1
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Mask a (raster) stars object in R with a vector (sf) object
In this question an stars object is masked with a raster object. But it is not clear to me how the masking can be done with a vector object using the stars pkg.
Consider the following example in terra....
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Load Vector Points into Mapbox from S3
I am trying to load a vector file of points into mapbox as a layer via s3, but I keep getting this very vague error:
message: "Unimplemented type: 3"
The steps I have taken are:
Convert ...
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3
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1
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64
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What is the difference between a feature source and vector layer?
I'm trying to use PyQGIS to make a tool script in QGIS 3. I'm using the default script template as a starter. The template uses QgsProcessingParameterFeatureSource() to define the input. A quick ...
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31
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Scale reference changes significantly when reprojected from GCS to PCS
I am using QGIS throughout this whole process.
I have a varied selection of open-sourced African spatial data (i.e. municipalities throughout Africa) that I have been trying to reproject from their ...
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43
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Unable to overlap polygons layer on raster layer in QGIS
I am simply trying to take a raster layer and overlay a polygons vector layer on top and then run zonal stats on the polygons using the raster layer, but when I look at the my raster layer and then ...
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Empty vector obtained from raster poligonization in QGIS 3.22
I am converting a NDBI raster into a vector through the poligonization process (raster to vector). I obtain a vector without any value.
In the symbology property, I tried different combinations of ...
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1
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Get slope and curvature values at each point of a grid point using ArcMap
I have DEM of a region using Slope and Curvature tool I generated raster files for slope and curvature of that region. But for my work I need slope and curvature values at each grid point (vector file)...
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77
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Vector and raster don't match
I'm working with QGIS and I would like to match the vector and raster data from Natural Earth. I used the same coordinate system (EPSG:4326) but both layers don't match. I want to change the style of ...
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Calculating classes' areas in QGIS (vectorized) with GroupStats plugin vs using Raster file
I used the Group Stats plugin to calculate classes' areas with the DNs as rows and "sum"/ "area" as column. The CRSs is in meters.
The output seems to work out, but I am not sure ...
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49
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Match feature diagrams with temporal fuction in QGIS
I am trying to create a time-dependent visualisation using a heatmap-styled points layer and a points layer with values to show at specific locations. The heatmap one shows occurrences over the ...
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How / is it possible to extract polygons from raster (ex: crop boundaries from satellite imagery)?
Is there any librairies/tools/others that can extract polygons out of crop boundaries from a satellite imagery. On the example below (random location in Belgium), the various fields limits are very ...
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Fixing"FeatureCollection (Error) Image.reduceToVectors: First band ('rh100') of image must be integral"
I am trying to extract the datapoints from GEDI collection and choose the points which lower than 60 in Google Earth Engine by using ReducetoVector. I'm getting this error:
FeatureCollection (Error) ...
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v.out.ogr -c flag in GRASS GIS is filling islands
I have a very big shapefile (polygons) to load in GRASS GIS, thus I am selecting only relevant rows based on a .txt file with some conditions (e.g., the ID of the polygon). However, when I try to save ...
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Creating horizontal legend bar in ArcMap
I tried to design this beautiful legend style with my vector data (by overlapping each legend framebox) in ArcMap, but I can't find a good model that fit with
Does anyone have any idea?
Here is ...
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Randomly sample points within polygons
I am working in QGIS 3.24.0. I have 200 vector layers in the form of circular buffers (same size, different extent) and a single layer of points (n=1,000 or so) contained within those buffers. 2 of ...
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Adding/concatenating multiple values in column when using line intersections in QGIS
I want to use the "Line Intersection" function in QGIS to create points wherever lines cross. The lines are roads and I need the road names in my points layer.
Does anyone have an idea how I ...
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1
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Use polygon lines to create masks
Given a tile (the cropped base map in the left) and polylines (red lines), is there any tool/workflow in QGIS to convert them into masks in the right?
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Extracting shapes from vector road data (specifically circles and lines)
I’d like to extract some specific data from QGIS to be drawn in a Garmin application which uses Monkey C but I am unsure of how to do it.
Currently I use many coordinate points to portray roads made ...
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130
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Calculate average value of raster within polygons based on type
I have seen How to calculate the average value of a raster within polygons?, which helps me a bit but not completely.
I have a raster of 16000 by 12000 (country-size) and a vector which indicates ...
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Increasing the smoothness of a wave
I wrote a Geometry Generator expression to create a sine wave in the canvas (don't ask, just having fun):
with_variable(
'points',
map(
'point_middle_left',
make_point(x(@...
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Dynamic stats in the decoration title lable, by time stamp, in QGIS
I am trying to create a visualisation method of simple stats using the title label in QGIS canvas. I need to observe temporal changes in the stats, so I have tried to specify a dynamic chunk of text ...
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227
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CSS transparency in GEE
I have imported a very simple shapefile to my map in GEE. Since this layer represents boundaries (see picture below), I am trying to find a way for the outline colour to be solid black whilst ...
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Modifying features in-place with a model
QGIS has some processing algorithms that allow modifying the layer's features in-place.
How can I create a tool in the graphical modeler that allows for the same in-place editing functionality, e. g. ...
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WMS is for raster... What is for vector layers? [closed]
From my understanding, standards such as WMS, TMS etc are mainly used to fetch raster layers from a map server.
What are the popular options for serving vector layers?
Can it be tiled or not tiled as ...
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Loading CSV File as Vector Layer from URL,Remote,Server (QGIS)
QGIS 3.24
I want to load a CSV file as a Vector Layer from my Server. The CSV file is regularly updated with new coordinates from a GPS tracker.
My code:
uri = "/vsicurl/http://mydomain.at/iot/...
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Merging feature within cells in QGIS [duplicate]
I'm dealing with a global fire map (vector map, polygons don't overlap), each cell contains the number of fires occurred in this area over the past 20 years.
I'm trying to sum up the value of "...
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103
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QGIS: Min & max buffer to cover features in another layer
I'm working with buildings in QGIS (vector polygons) and have two layers - call them a "source" building and multiple "sink" buildings (in second layer). How would I go about ...
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OpenLayers vector accuracy in EPSG:3857 projection
I'm working on a web mapping solution that stores data in PostGIS with EPSG:4326 projection. Everything seems to be good until last week. My customer loaded two shapefiles that some parts are ...
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QGIS Calculate Percentage Area of Grid Cell
I'm trying to use QGIS to calculate the area of each grid cell that has been deforested.
To do so, I have tried the following:
Create Grid to create a 30km x 30km square grid
Add Deforestation Layer (...
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