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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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3 votes
1 answer
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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
0 votes
0 answers
15 views

How to join tables and open the gridded SSURGO data

I am having a big dilemma. I am fairly inexperienced and new at QGIS and I can't find any resources to help me with the basics in accessing and using the SSURGO gridded soil data. My ultimate goal is ...
Han's user avatar
  • 13
2 votes
0 answers
26 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
50 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
51 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
28 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
87 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
48 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
32 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
34 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
  • 75
0 votes
1 answer
78 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
41 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
  • 329
0 votes
0 answers
35 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
0 answers
23 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
30 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
37 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
71 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
59 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
26 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
19 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
57 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
47 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
45 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
79 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
68 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
71 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
80 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
54 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
29 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
85 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
35 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
54 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
67 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
163 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
56 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
  • 3,824
0 votes
1 answer
77 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
1 vote
1 answer
341 views

How to extract 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
  • 1,504
1 vote
1 answer
134 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
  • 21
0 votes
1 answer
71 views

QGIS Reproject Tool doesn't change vector size? [closed]

I'm new to GIS and confused about the Reproject tool in QGIS. I created a square vector grid in QGIS, with 100 4km by 4km cells. The grid was created in EPSG:3857 - WSG 84 / Pseudo-Mercator. But when ...
IntrepidCaterpillar's user avatar
2 votes
0 answers
63 views

Selecting features based on minimum overlap with another layer in QGIS [closed]

I have a "sites" vector layer with 300 polygon features and a "heathland" vector polygon layer, showing the locations of heathland areas. I am looking for a way to select all ...
nn90's user avatar
  • 57
1 vote
1 answer
63 views

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
2 votes
0 answers
128 views

Efficient and quick way to rasterize very large polygon (20GB)

I´m currently working on a large (> 20 GB) vectorized dataset (Geopackage format) holding land cover classification information for an entire country. I´m looking for an efficient and quick way to ...
G. Arruda's user avatar
3 votes
1 answer
136 views

Creating dummy (random) vector layers of different geometry types, with random attributes

Problem In QGIS, one sometimes needs some layers with dummy data just to test something: the functionality of an expression, the syntax of an SQL query in a virtual layer, creting quickly an animation ...
Babel's user avatar
  • 72.1k
2 votes
1 answer
264 views

Deleting points close to each other using QGIS (point thinning)

I'm trying to decimated a point shapefile to remove points close to each other. If you look at the example below, you can see points are 30cm apart, but other are closer. I just need to remove ...
Gil's user avatar
  • 121
2 votes
1 answer
61 views

Color Vector Line Using Different Data Layer QGIS

I have a project that has two important data layers. One contains raster data, in this case slope, and another layer that contains a bunch of vector lines. I want the color of the line to reflect the ...
Ethan Crosby's user avatar
0 votes
0 answers
73 views

Split with lines in QGIS get stuck at a certain %

I have a problem when using split with lines in QGIS. So I have two layers, First is land cover classes (closed forest, open forest, cropland, etc.), and Second is a management blocks. My task is to ...
zxz_341's user avatar
  • 21
0 votes
0 answers
44 views

Extracting road parts from a vector

I have vector drawings as in the image. The sections in these vectors represent physical roads. Is there an easy way to extract these road sections to a different vector layer? Or will this be a ...
firstlord's user avatar
  • 149
0 votes
0 answers
177 views

Opening DNC, VPF, VMAP in QGIS

Does anyone know how can I open a VPF or a DNC file in QGIS? It does not work through normal data layer adding channels. I can open a shapefile through them just fine. Documentation says that it ...
DieSlower's user avatar
  • 101

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