Questions tagged [vector]
A coordinate-based data model that represents geographic features as points, lines, and polygons.
1,878
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Loading features from server on tile level and according to zoom level?
I am using openlayers to display a large amount of features in the map. Because the number of features is too large, I cannot load all the features to frontend in one API call. So I want to get ...
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Some grid tile didn't get features when I using tileStrategy in OpenLayers
Question updated at 2023-05-26.
Context: Use ol/layer/Vector and ol/source/Vector.js to display my features.
Following is my vector source:
const vectorSource = new VectorSource({
format: new ...
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How to get vector features by x,y,z in OpenLayers
I have a list of features in my server and I want to render them in OpenLayers.
I know I can use ol/source/Vector.js to render my features as following code:
const vectorLayer = new VectorLayer({
...
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Substracting water mask
I have a polygon with water bodies of my AOI. I would like to clip the water bodies from my NDVI raster layer ( like a water mask). I haven't found a tool in qgis or arcgis pro so far.
Do you have any ...
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Calculating the majority value pixel in a polygon and the percentage of this value within the polygon. QGIS
I have a big shapefile ( more than 500.000 polygons) and a raster file. I want to calculate the majority pixel per polygon, which I can do with zonal statistics. However, I also need the percentage of ...
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Convert QGIS heatmap raster output to vector
I am quite new to QGIS and I am trying to create a species distribution map using public reporting data. I can very easily generate a heatmap by first converting the pentad data to vector centroid ...
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71
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Drawing line to the centroid of the concave hull composed by the set of each group of points within the same polygon
I am using the following Geometry Generator expression with which, for each point geometry, I draw a line to the centroid of the polygon the point is within:
make_line (
$geometry,
...
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Clipping a line based on distance from a specific point
I need to track along each of the lines that originates from the points below. As you can see, there are a number of lines that lead out from each point. I need to find the point along each of the ...
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selecting features having area in a specific range
I have converted the image to vector, now I need to select area features which are less than 5sqkm and greater than 0.5sqkm. following is the code but I'm getting an error, please help me with the ...
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Lines getting automatically simplified in ArcGIS Pro [closed]
I painstakingly follow a complex, windy road, drawing a line using the create features tool. My points are snapped to a line in another layer. I finish the line by double clicking, and many of the ...
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How to if a polygon is within a concave area of another?
Is there a method where I can detect if a polygon is inside the concave area of another (in this case a bay), then output the bay itself?
It's hard to explain with words so I'll demonstrate below:
...
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140
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Create one continuous polygon from many polygons with holes in QGIS
How can I create one single continuous polygon from many polygon and the gaps will be preserved? So whole polygon will be connect into one big single polygon.
Using the dissolve tool will not connect ...
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QGIS 3.22.16 How to join two table with different values
I am using QGIS 2.22 16. Working on a road network shapefile I was asked to add in this layer the road names from another road network shapefile. I thought about using the join tool. Unfortunately, ...
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How to Export Vector line to 3d print in CURA
I downloaded a .shp file from NOAAs website for the shoreline . [https://nsde.ngs.noaa.gov].
I am trying to 3d print from Cura the shoreline file to add to my dem file 3d print of topography so I can ...
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Choropleth map layer in OpenLayers
I tried to mimic the solution from Creating choropleth map using OpenLayers?. My implementation is as follows:
const temperatureSource = new VectorSource({
features: tempData
.filter((_, ...
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Establish a least-cost path between a point and a line (coastline)
I have a basic level of knowledge of ArcGis Pro. I need to establish a "least cost path" between a point and a line, which, in this case, is the coastline. What is the procedure?
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Python plugin for getting elevation along the boundary of a shapefile [duplicate]
I have a shapefile of an Indian state and the raster data/DEM of India, and I want to get the elevation data along the boundary of the state as a DEM.
the problem with picture 3 method is that some ...
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70
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Getting the elevation around the boundary of polygon in QGIS
In QGIS 3.28.2 Firenze I'm working on developing a QGIS plugin to get the elevation along the boundary of a polygon.
Given a shapefile polygon and a raster, I've been able to think of one solution:
...
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26
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How to combine vector data (census) with raster data (inundation)
I am hoping to find a way to create a map showing the overlap of flood inundation and social vulnerability in QGIS.
I tried using zonal statistics, but it does not take into account the values, just ...
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QGIS - Spatial Join with Raster and Vectorial files
I have two layers, a raster (arr_ker) and a vector (Polygon), as can be seen below:
In QGIS, I need to add the raster data to each of the entities found in Polygon. It would be ideal as an average.
...
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ArcMap - Spatial Join with Raster and Vectorial files [duplicate]
I have two layers, a raster (arr_ker) and a vector (Polygon), as can be seen below:
In ArcMap, I need to add the raster data to each of the entities found in Polygon. It would be ideal as an average.
...
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Creating a raster from a vector file (single data points)
I am trying to create a raster from a vector file that is made out of point coordinates.
My data looks like following and that's the error that jumps out, when trying.
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OpenLayers basic Vector Math operation: add, subtract, normalize
Is there a supported or built-in way to do basic Vector2D Math operation in OpenLayers v6 ?
Currently using p5.Vector library (from p5js.org) to do add, subtract, normalize.
JSTS does not export ...
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Show a fixed number of decimals in expression for vector categorized styling
So I am creating a categorized styling using an expression involving float numbers.
The results looks like this
The first row is displayed as "0 - 0.2m"
Is there a way to set in the ...
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47
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QGIS: editing vector layer with 'delete feature' option locked
I need a vector layer to be editable, to change feature geometry and attributes, but at the same time, I need to prevent users from deleting features in the layer. Is there a way of locking the '...
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Adding a layer stored in a PostGIS database to an OpenLayers map as a clickable vector layer via GeoServer
I can view a layer (called wmsSource), created as a vector point-set, and stored in a PostGIS table from an Esri shapefile, in my OpenLayers map, as a WMS Image layer, using this code, a modification ...
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79
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How to ensure a newly created layer displays on the canvas
I am trying to perform some categorization from an existing vector layer such that after performing the calculations, a new vector layer is created with just the new fields created. After running my ...
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Using v.distance to classify points far from overlapping polygons always return the same set of polygons
I have two vector layers with the distribution of an animal species. EDIT: I'm showing how the maps look in QGIS, but I'm working in GRASS GIS. First dataset:
Second dataset:
As you can see, these ...
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get vector density map where vectors are not overlapping
I have a vector layer in which the lines (bus routes) do not overlap each other, but are located close enough (visible when zooming in). I want to get a route density map as a result. To do this, I ...
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PyQGIS: Save as KML doesn't work using QgsVectorFileWriter
I have a line layer (multiple lines but not large) that I'm working with in my PyQGIS plugin and I need to save the layer as a KML file in the end. My code looks like this:
saveLocation = filePath + &...
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45
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Validation of Vector Geometries to OGC Standards
I'm currently using FME to validate geometries, coming from 3rd parties, making sure there to OGC Standards.
I was hoping to be able to replicate these checks in QGIS, but find the tools available (...
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Extracting pixel values based on condition
I have one raster file on land cover (30x30m pixels), one raster file on soil organic carbon (SOC) (250x250m pixels), and one vector file with contiguous polygons of different sizes.
What I require is ...
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Measure distance from points to edge of polygon in QGIS
I am trying to measure the distance from several points to the edge of lake polygons. When I use the Distance to Nearest hub function in Vector analysis, I get the following error message:
QGIS ...
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Polygons within Polygons
I am using QGIS V3.30
I have a set of polygons, being farm boundaries. I have another set of building polygons comprising various features within the farms.
I would like to get a table listing all ...
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Converting a KML file into a shapefile as applied (vector to raster)
I have received a KML file from a drone, this file displays the path at which the drone was flown. I would like to convert this into a shapefile to display the swaths that the drone covered. I know ...
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Assess correlation between two variables in a polygon vector layer
I have a polygon vector layer, and for each polygon (representing administrative zones) I have 2 quantitative variables. My goal is to formally assess whether there is a correlation between those two ...
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Feature Selection for Geospatial Vector Data Classification
The problem I am exploring right now is a binary classification problem about classifying road intersections into roundabouts or not roundabouts. The available input data consists of the GPS latitude /...
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1
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58
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Selecting points based on random index location from a filtered GeoDataframe in Python?
I have a large point vector file (and many others like it), where each point has a integer value in the column "DN". However, I only need 6 points per DN and want them to be selected ...
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Select multiple features from multiple layers in QGIS
I am analysing land use across multiple region.
Each region has its own vector dataset. Each dataset contains the same columns and land use classifications (e.g. 'AC66' or 'TC01'), describing units of ...
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70
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Why is $length not giving me correct values?
I'm attempting to make a topographical map of Death Valley National Park, CA. I'm using EPSG:26911 and having an issue with filtering by length. In order to get rid of all of the tiny geometries that ...
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Converting GeoTIFF to vector yields a very busy vector layer
I've been looking for a good way to convert GeoTIFF files to vector files. Specifically it is these files: https://data.jrc.ec.europa.eu/dataset/1d128b6c-a4ee-4858-9e34-6210707f3c81
I used QGIS to ...
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Determine the time-stamp of the earliest point in each polygon overlaid with a point layer using QGIS
Currently, I have a vector layer with polygons in it and another layer with points. There is a column with an exact time stamp in the points layer; I would like to determine the time stamp for the ...
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How to merge selected polygons with all adjacent polygons individually?
I have a vector layer with polygons representing administrative districts of germany. For every polygon smaller than 500 km² I would like to create bigger polygons by merging each of the small ...
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Dividing shapefile into specific grid in ArcMap
How can I divide a shapefile into grids of 5km by 5km in ArcGIS? How can we use fishnet in this case?
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QGIS: Sample points from neighbors according to conditions
I am sampling points (city coordinates) in QGIS from a raster data set using the Point Sampling Tool (among a number of options in QGIS).
In some cases, the city coordinates are just off the raster ...
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33
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Raster and vector analysis for profile extraction in Python [closed]
I have quite complex problem and I have two options to solve it. For a multiline shapefile (river) I would like to get cross profiles and extract DEM values for the lines.
I was thinking 1: Create ...
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Create Lower Zoom Levels from High Zoom Level MVT Tiles
I have a rather large set of a single zoom (8) of MVT bundled as an mbtiles file.
Is there a way to generate the rest of the "pyramid" for those tiles and down-sample for zooms 0-7?
I'm ...
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Converted lines to one feature using Dissolve but exports as multiple features
In QGIS, I've taken all of my lines/features and "dissolved" them into one feature, but after exporting as a SVG or PDF, it imports into Inkscape as 1231 features (the amount I originally ...
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Print layout is rasterized before exporting as SVG
So I've set up my layer to how I'd like for it to be exported as an SVG, but after adding the map to New Print Layout, it rasterizes my layer and makes it unusable in my other program. Is there a way ...
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Rasterize sf object in R (desired cell values 1 and 0)
I have a vector file (multipolygon) in class sf, which I want to turn into a raster of a certain extent. I need all the areas where polygons are located to be value 1 and all areas where no polygons ...
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