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Questions tagged [vector]

A coordinate-based data model that represents geographic features as points, lines, and polygons.

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2 votes
1 answer
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Joining attributes by nearest and getting distance in meters in QGIS

distance is from the line feature to the point feature in CRS units, how can I get the distance in meters?
LBL's user avatar
  • 51
1 vote
0 answers
15 views

Bulk export images of single vector overlaid on series of rasters in QGIS

I am using QGIS 3.34.6. I have 54 clipped raster files (monthly satellite pasture observations) with a vector file (farm outline) overlaid. Raster layers follow yyyymm naming convention. In order to ...
James's user avatar
  • 19
1 vote
0 answers
41 views

Points disappear after applying rule based symbology (QGIS Maidenhead)

Trying to colour points by a field I have in a shapefile. The data field I'm interested in is called "main_commo" I've put in the 3 rules (in this format: "main_commo" = 'LEAD') ...
user250228's user avatar
0 votes
0 answers
18 views

How to prevent Tippecanoe from dropping features?

I have a huge geojson with electric lines and columns. So I need to convert the file into vector tiles for displaying on my OpenLayers map. I use this sequence of commands: tippecanoe --no-feature-...
Marek Strop's user avatar
1 vote
1 answer
39 views

Clean up polygon after difference tool QGIS

So I'm using the difference tool in QGIS to remove a bunch of areas from a polygon representing a state. Problem is, these areas don't fit together perfectly, and the result looks very messy. How can ...
user240982's user avatar
0 votes
1 answer
51 views

Load results of split vector tool into group using PYQGIS

I try to write a script to automatically merge some input layers (all of the same structure) of a geopackage into one, afterwards split it by a specific attribute and save the output as geopackages to ...
Calidris's user avatar
2 votes
1 answer
78 views

Drawing rectangle of road line with width as minimum distance between two buildings in QGIS

I have two layers: line vector layer representing the road polygon vector layer representing the buildings How can I derive a rectangle shape (refer to green rectangle) for each road line whereby ...
LBL's user avatar
  • 51
1 vote
1 answer
72 views

Creating polygon layer (road border) from line layer (road) and polygon layer (buildings) using QGIS [closed]

Picture 1 showing a line layer representing road and a polygon layer representing buildings. How can I create another polygon layer for the road with the edge touching the buildings e.g. thick orange ...
LBL's user avatar
  • 51
1 vote
1 answer
38 views

Generating values and creating heatmap from three different point vector layers in QGIS

In QGIS I would like to turn what I have into a heatmap. I have 3 different sets of points that go across the map of the UK (see the image attached) that represent coastal marine habitats. What I want ...
Greeny's user avatar
  • 11
0 votes
0 answers
35 views

CROP CIRCLES : Looking for an easy way to IMPORT and SCALE vectors in a custom map on Google Maps

The point of the project is to make some crop circles, The objective is to be able to trace a polygon from a map by walking around a field (and using the GPS to be able to see where you are). I need ...
Landwalker's user avatar
0 votes
0 answers
52 views

Difference of circle buffer area to calculated area in QGIS

When I create a circular buffer around a point feature in QGIS 3.36.3-Maidenhead in EPSG:25832 of a 10 km radius with 1000 segments I get 313961275.193 m² as a result. I calculate the area by typing $...
m4D_guY's user avatar
  • 49
3 votes
1 answer
75 views

Clipping buffers by Unique ID

I am doing my thesis on worldwide river discharge data availability. I need to know how to cut buffers with their corresponding vector/polygon that have an unique ID. I have stations worldwide with ...
Sebastian's user avatar
2 votes
0 answers
36 views

Filling in NULL data in vector grid with values derived from Nearest neighbour cell values

I have created a grid with 5m x 5m cells which contains the summed values from a point file. Within the grid I have NULL values (selected in Yellow) where there was no points within the cell, yet the ...
A Auld's user avatar
  • 81
0 votes
0 answers
60 views

Handling large geospatial datasets for dynamic WebGIS application with PostGIS, Mapbox

I'm developing a WebGIS application that displays snow depth data for ski slopes using PostGIS, Mapbox, and Martin. My workflow is as follows: Process LiDAR data to produce GeoTIFFs of snow depth. ...
Nicolas Guibal's user avatar
-1 votes
1 answer
58 views

MULTI RING BUFFER VECTOR LAYER TO RASTER [closed]

I have a line vector file in qgis in which I run the multi-ring buffer command to divide the area into 200m zones from the river because I want to make a flood hazard map. So I have a multi ring ...
Rafaela Zylali's user avatar
0 votes
0 answers
29 views

How can I add an empty Attribute column to an existing (ESRI) shapefile (.shp) [ or a Table] and populate it with values from a Raster (Image) layer?

I have a GIS layer of Agricultural Field Boundaries (cadastral boundaries) with dozen attributes including Owner's Name, Seasonwise Crop list, etc. I want to add and store a new attribute called ...
Dr. Manab Chakraborty's user avatar
3 votes
1 answer
89 views

Excluding some values from the quintile classification in QGIS

I am working in QGIS with a vector layer of about 8000 records and I would like to use the graduate symbology, equal count (quantile, 5 classes) with a variable that contains some records to which the ...
Geo_it's user avatar
  • 523
1 vote
0 answers
50 views

Fully filling vector layer with polygons without dissolving the current polygons in QGIS [closed]

I have a vector containing flow paths for a specific area, with values ranging from 2-4. I want to fill in the rest of the area (to the red line boundary) with another/more polygons with a value of 1 ...
ashlaff's user avatar
  • 25
0 votes
0 answers
34 views

Find area of patch if two vector files overlap

I have two vector files containing polygons. I want to calculate the area of polygons in add if they are touched by polygons in re. I have tried but I only find the area of the intersected area, but I ...
Thomas's user avatar
  • 925
2 votes
1 answer
38 views

Transfering attribute from line layer to polygon layer by their overlay in QGIS

I have a polygon layer that represents sub-catchments and a line layer that represents a stream network. There is exactly one feature in the line layer for each polygon. I have used v.rast.stats to ...
Fabi's user avatar
  • 85
0 votes
1 answer
94 views

Shifting / moving entire layer in QGIS

I'm trying to work on two sets of data : Public roads (official source, purple on the image) Network data (private source, brown on the image) Both layers should overlap (at least, the network data ...
Vincent Monteil's user avatar
1 vote
1 answer
45 views

Create vector layer using specific cells from a raster

I need to create a point layer from a big raster layer in QGIS. I only want points on the pixels with a '1' value, rather than have a point in EVERY cell (which apparently will take a day to process ...
Phoebe's user avatar
  • 351
0 votes
0 answers
44 views

How to speed up "Write Vector Tiles (MBTiles)"

I'm encountering a significant delay while exporting my map, which contains a large number of polygons, into a Vector Tiles MBTiles file. Currently, it seems to progress at only 50KB every 30 seconds! ...
Kevin's user avatar
  • 1
0 votes
1 answer
28 views

Add vector layer from PostGIS table to existing data store using Python geoserver-restconfig

I am trying add a vector layer from PostGIS table to an existing datastore. Does geoserver-restconfig allow this? from geoserver.catalog import Catalog cat = Catalog(service_url=serv_url, username='...
Arun.R's user avatar
  • 1
0 votes
0 answers
32 views

QGIS - add OS NGD Tiles - API as a vector layer

I have been making good use of QGIS and found the help files able to get me through most problems, although now I am completely stuck at trying to get the "OS NGD API - Tiles" vector tiles ...
Jam's user avatar
  • 1
1 vote
0 answers
44 views

OpenLayers add GML32 to map doesn't work

I'm new to this forum, but was thinking someone here could probably help me out. I recently moved from using leaflet to using openlayers. For a new project I want to display the content of a gml file ...
valentinooz's user avatar
0 votes
1 answer
86 views

Measuring front setbacks of buildings using ArcGIS Pro

Does anyone know how to measure front setbacks using ArcGIS Pro? I’d like to measure the distance from the front of the parcel to the nearest edge of the building of each lot. I’m aware of the Near ...
gisgirl578's user avatar
5 votes
0 answers
77 views

QGIS hexagonal grid size specifications

I am trying to understand how grid size/cell size is calculated while using "Create Grid" function in QGIS. According to https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/...
Jirka Panek's user avatar
0 votes
0 answers
31 views

Extract a vector from a raster with a single boundary in QGIS

I have a "problem", I need transform a raster in a vector and it works but some pixels like the one in the print it is separated from the boundary, and for my use (a specific use of ...
Mestrexama's user avatar
0 votes
0 answers
21 views

v.generalize along tile edges

I have a problem with v.generalize and I hope I can find help here. So what I'm trying to do is the following: I have a large number of 1x1 km tiles of rasters that represent traffic areas (roads, ...
Felix_geospatial's user avatar
0 votes
1 answer
61 views

Raster to vector bunch of errors

I'm having a problem where I can't convert my raster file to vector using the raster menu, I'm kind of new to the area and some errors appear that I have no idea how to fix. I know I can do something ...
Leo's user avatar
  • 3
0 votes
1 answer
58 views

Downloading vector data to make it available for analysis in QGIS

I want to have access to the vector shapes for site analysis from this site https://maps.gsi.go.jp/vector/#15.958/35.136852/140.273124/&ls=vstd&disp=1&d=l I would like to download or add ...
user240140's user avatar
0 votes
1 answer
47 views

Multiple step function tasking with PyQGIS [duplicate]

Running a function in QGIS (example - "native:geometrysmooth") on a single shapefile, I can copy the 'Python Command' once setup and replicate this to run in the Python Console for a single ...
Trudon01's user avatar
0 votes
0 answers
84 views

QGIS - Raster Layer and Roads - Calculating Pole of Inaccessibility

I have a TIFF raster that represents landcover called Forest with a value of 1 for landcover and 0 for no data. I also have GPKG polyline layer Roads which is an extract of Highways from OSM. I need ...
Dunner's user avatar
  • 43
0 votes
0 answers
78 views

Clip a GeoJSON layer based on polygon drawing

I want to know if is possible clip a GeoJSON layer based on a feature drawn with drawing tools in OpenLayers. I followed this steps (https://openlayers.org/en/latest/examples/layer-clipping-vector....
Juan Pablo Rosset's user avatar
-2 votes
1 answer
80 views

Why do only points appear when I load shapefiles into QGIS?

I was sent files in these formats : .cpg, .dbf, .prj, .sbn, .sbx, .shp, and .shx. I tried importing the zipped file containing all of them using Layer > Add Layer > Add Vector Layer and ...
Elyse's user avatar
  • 1
3 votes
1 answer
82 views

How to speed up ST_Union PostGIS query for complex problem

I'm fairly new to working with PostGIS and have experienced the issue of extremely long runtimes when working on my data. Here's what I'm trying to do: I have an infrastructure dataset that is made up ...
Felix_geospatial's user avatar
1 vote
1 answer
56 views

Only Clipping part of a vector layer with QGIS

What tool I would use if I just wanted to clip one area in a vector layer? I want to be able to make the red line extent match the green border, without clipping out the rest of the red extent (which ...
Peter McGregor's user avatar
0 votes
0 answers
34 views

Use exported WMS layer style (.qml or .sld) to style a vector layer in QGIS

I'm reaching out for assistance with a problem I've encountered while working with QGIS. My goal is to apply the styling defined in a WMS (Web Map Service) layer's exported style file (either .sld for ...
Mabignix's user avatar
  • 140
2 votes
1 answer
87 views

Field Calculator Aggregate returns NULL

I'm facing an issue while trying to calculate the maximum value within polygons from another vector layer in QGIS. I've tried using the aggregate function with the 'max' statistic, but the result is ...
Zuchiatti's user avatar
0 votes
0 answers
38 views

How to display on a final map the scale of a vector field marker?

I'm using the vector field marker to display earth deformation. For that, I defined the vector field marker with cartesian components (x (field_3) as displacement in West-East and y (field_4) as ...
user238085's user avatar
0 votes
1 answer
55 views

Projection issue with vector layer

I'm new to using QGIS. I seem to have the issue that a vector layer I've imported into QGIS 3.26.3 is incorrectly projected into the project as it isn't where it should be. It seems that the layers ...
John Smith's user avatar
1 vote
1 answer
75 views

QGIS: Need to create a feature for a vector layer with a list of all unique values derived from a raster layer's cells

I have a vector layer with inner boundaries delineating certain land-use types in each discrete area. I also have a raster layer that contains information related to the vegetation found in each ...
Linus's user avatar
  • 31
0 votes
0 answers
27 views

QGIS: Processing tools adding a false edge to vector layer with extreme values

I am working in QGIS 3.34.2 and several processing tools I've used so far have added a thin outline (1 cell wide?) to the edge of my area of interest (see output of aspect tool below). The vector ...
Linus's user avatar
  • 31
3 votes
1 answer
201 views

Missing Geoprocessing Tools and Field Calculator in QGIS

I am currently facing an issue with my QGIS software (version 3.32 LIma). The geoprocessing tools for both vector and raster operations have suddenly stopped working, and I can't seem to locate these ...
sajlus's user avatar
  • 39
2 votes
0 answers
64 views

PostGIS - tiling vector layer

I have a height isoline vector layer covering a large area, but most of the time, I am only working on a small part of it, so all kind of handling of the data goes slowly. Are there any ways to make a ...
MortenSickel's user avatar
  • 3,834
0 votes
1 answer
80 views

Merging multiple line and point vectors in QGIS 3.28 [closed]

I have hundreds of line and vector layers. The line and vector layers are from several kml files. I want to combine the line and point vectors respectively and automatically without having to manually ...
SimplyWilly's user avatar
3 votes
1 answer
436 views

Extracting country borders as vector data from OpenStreetMap

I want to download country borders as vector data from OpenStreetMap. The best would be in a common vector geodata format like GeoJSON that can be used e.g. in QGIS. I there a simple way to do this?
winnewoerp's user avatar
  • 1,544
1 vote
1 answer
136 views

Splitting line to upper and lower parts in QGIS

I need to split lines (rivers) to upper and lower parts (upstream and downstream) by points (fish barrier). All the original lines start from upstream and end downstream (picture). SAGA's "Split ...
omomom's user avatar
  • 11
1 vote
1 answer
36 views

Unable to set working directory for split vector layer tool

I have some data in a .shp layer that I want to separate into multiple vector layers based on ID. When I navigate to the Split Vector Layer tool, I can select my input layer, unique field ID, and ...
anzac21's user avatar
  • 71

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