All Questions
1,968 questions
-1
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0
answers
30
views
Is there any way to access road data from Google or ESRI in vector format? [closed]
I’m looking at region of Saudi Arabia where the OSM data is very incomplete. I noticed much more complete data on Google Maps and also ArcGIS Online (I didn’t make a bookmark but you can use the ...
- 133
-1
votes
0
answers
63
views
Clipping a raster layer to a polygons shapefile but nothing is actually clipped
I am using QGIS. I have the following polygons shapefile of the New York City Boroughs at
EPSG:4326 - WGS 84:
I then have the following raster grid showing a KDE heat map of some variable:
As we can ...
- 7
0
votes
0
answers
40
views
Australian Albers raster and WGS84 vector will not register
With QGIS 3.40 and MacOS 15.1, I cannot get the Australian Albers raster and a CSV text CSV file to line up correctly.
The raster is Australian Albers. I cannot tell if it is GDA94 or GDA2020 but with ...
0
votes
0
answers
19
views
Vector tiles vs raster tiles when building a heatmap
Can heatmaps be generated and stored as a vector tile?
Based on the research I made, heat maps depend on density of features. And with vector tiles often we have the tiles simplified and features ...
- 11
3
votes
1
answer
69
views
Vector nodes no longer highlighted in QGIS
I'm using the latest version QGIS 3.34.13. When I have used QGIS before when I hover the mouse over e.g. a line or polygon in a vector layer then a small blue box will appear when I am close to a node....
- 135
1
vote
0
answers
23
views
Creating the overlay of buffer polygons in QGIS [duplicate]
I have an outline of forest areas (line) and applied the tool "buffer" to it. Now I want to create a file that only contains the overlay of the buffer polygons.
In ArcGIS Pro this can be ...
- 11
1
vote
1
answer
49
views
Unable to dissolve [duplicate]
I want to dissolve a polygon layer (land use and cover), but when i try the dissolve,to eliminate the borders for the same selection, it says geometry invalid.
What should I do?
Vector that I'm ...
1
vote
1
answer
127
views
Cropping vector by raster in QGIS
I have a vector shapefile consisting of polygons and I want to crop it in QGIS by a raster layer of a smaller spatial extent, where the polygons do not extend beyond the raster edge. I have tried the ...
- 335
2
votes
1
answer
121
views
Create lines in QGIS from a list of coordinates in Excel
I need to create lines in QGIS (currently using 3.40.0. version) from a list of coordinates in an Excel file.
The Excel list has the following fields: ID, X_start, Y_start, X_end, Y_end
I would like ...
- 904
2
votes
1
answer
109
views
Converting geodatabase into GeoPackage using ArcGIS Pro
I am using ArcGIS Pro 3.1.2.
Is there a tool that can convert a geodatabase containing multiple vector layers into a GeoPackage?
- 360
3
votes
2
answers
294
views
How to concatenate two GeoJSON vectors with different geometry type in QGIS
I have two GeoJSON files with different shape types (Polygons for one and Points for the other) and I would like to concatenate them in a single vector layer that I can export back to GeoJSON.
When ...
- 3,045
2
votes
1
answer
130
views
Cannot create raster given vector in QGIS
I have a vector which looks like below. I want to create a raster from this, with cells having 1 for roads and 0 for empty areas using QGIS (3.36.3-Maidenhead).
I have tried tools like, gdal:rasterize,...
- 153
3
votes
3
answers
226
views
How to obtain the longitude and latitude coordinates from point data and identify which row in the .csv file that this point belongs in QGIS
Problem
I have a CSV file with two columns containing longitude and latitude in decimal degrees. I have created a point layer and I was surprised to find that some of the points are located on land ...
- 319
0
votes
0
answers
33
views
Calculate the Length of overlapping vectors within the same Line layer
I have one layer with a bunch of lines (Cables) and in some places there are multiple cables running parallel. I need to find out length for Singe cable, Length for 2 parallel, 3 and so on.
There isn'...
0
votes
1
answer
76
views
Connecting all points to each other with lines in QGIS [duplicate]
I am trying to figure out a way to connect every point in a data table with lines. To be specific I do not want to create a line path by consecutive points but rather, in a simplified version of my ...
- 1
0
votes
0
answers
38
views
Vector Overlay-Clip tool error
When I try to clip two layers in QGIS, it generates an error. I made sure the layers are in the same EPSG, but it hasn't worked. Also, I have changed the layer to a shapefile or just left it as a TAB, ...
- 1
2
votes
2
answers
67
views
Finding majority land use class within polygon in QGIS
I have a polygon layer containing the wards (neighborhoods) of an area. It has only one column in the attribute table, called "WD21CD" which is a string with the unique code for every ward (...
- 1,167
4
votes
4
answers
190
views
More efficient way to use Symmetrical Difference tool for layer with many features
I have a layer called habmap_combined with 24,934 features and a high number of vertices (it was a raster and is now a shapefile).
I have another shapefile called waterbodies, for which I want to ...
- 151
0
votes
2
answers
40
views
QGIS Identify multiple intersecting vectors
I have 30+ vectors layers (constraints to tree planting). I want to be able to draw a polygon vector and be able to identify which of the 30 constraints are present within this 'planting' polygon.
The ...
- 1
2
votes
2
answers
118
views
Connect ends of parallel line features to form polygons
I have a shapefile consisting of many sets of parallel line features. Each set has a unique ID. I want to close the ends of each set of parallel lines and create polygons. Is there a way to do this ...
- 21
0
votes
0
answers
46
views
Delete duplicate vectors from command line
I have one vector layer called "trails" and another called "roads."
There are vectors with identical geometry, and I want to delete any vectors in the trails layer with identical ...
- 186
0
votes
0
answers
39
views
Selecting multiple sections within polygon to create multiple separate polygons in QGIS
I have a large polygon split up into many different sections. Each section has an ID number ranging from 1-13. I want to be able to select all polygons with a certain ID, and then create a separate ...
- 11
2
votes
1
answer
49
views
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?
- 51
1
vote
0
answers
17
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 ...
- 19
1
vote
0
answers
43
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') ...
- 11
0
votes
1
answer
106
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-...
0
votes
1
answer
68
views
Clean up polygon after difference tool QGIS
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 I ...
- 89
1
vote
1
answer
84
views
Loading 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, then split it by a specific attribute and save the output as GeoPackages to a ...
- 97
2
votes
1
answer
86
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 ...
- 51
1
vote
1
answer
75
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 ...
- 51
1
vote
1
answer
50
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 ...
- 11
0
votes
0
answers
48
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 ...
0
votes
0
answers
54
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 $...
- 49
3
votes
1
answer
83
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 ...
- 31
2
votes
0
answers
63
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 ...
- 81
1
vote
0
answers
102
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.
...
-1
votes
1
answer
73
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 ...
0
votes
0
answers
34
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 ...
3
votes
1
answer
99
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 ...
- 533
1
vote
0
answers
56
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 ...
- 25
0
votes
0
answers
38
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 ...
- 917
2
votes
1
answer
46
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 ...
- 85
0
votes
1
answer
199
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 ...
- 185
1
vote
1
answer
78
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 ...
- 351
0
votes
0
answers
80
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!
...
- 1
0
votes
1
answer
37
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='...
- 1
0
votes
0
answers
61
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 ...
- 1
1
vote
0
answers
65
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 ...
- 11
0
votes
1
answer
150
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 ...
5
votes
0
answers
171
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/...
- 171