Newest Questions
166,375 questions
0
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SCP Preview Accurate but Final Raster Shows Fewer Classes After Classification
I’m using the Semi-Automatic Classification Plugin (SCP) in QGIS for the supervised classification of Landsat 7 imagery (2001). The Preview Classification accurately shows all expected classes (e.g., ...
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0
answers
8
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Having OSM(ZXY), I want to get WMTS (TileMatrix,TILECOL,TILEROW) for substitution in the WMTS tile query
I have OSM tile coordinates Z=15, X=17522, Y=12176
https://tile.openstreetmap.org/15/17522/12176.png
I want to make a request to a GoServer deployed locally to get the same tile from another map. ...
- 1
0
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0
answers
13
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QGIS 3D point symbols sitting on DEM terrain (clamped) in 3D map view
Using QGIS 3.40.1 Bratislava on Win 10, I have a raster layer with elevation data (digital elevation model, DEM) and a point layer. The point layer has a 3D view definition in layer styling: Cylinder, ...
- 75.2k
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19
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Unexpected Areas Outside ROI Included when exporting TIFF files
I'm working on a water quality analysis application using Sentinel-2 satellite imagery, machine learning, and Google Earth Engine (GEE). The goal is to process satellite images, apply a machine ...
-3
votes
1
answer
24
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Two similar Python-AI generated csv-files with KDE values are handled differently by QGIS. One is resulting in visible points, the other not [closed]
I am interested in KDE-values of a Heatmap and Contour-map created by five coordinates around Munich and Augsburg. I employed two Python-AI-generated scripts (attached), which appear to be valid as ...
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0
votes
1
answer
24
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Latitude and Longitude for CSV CALFIRE Dataset
I am trying to create a map with the CalFIRE fire perimeters data (CalFRAP dataset) on ArcGIS Online. I have downloaded the CSV file for the fire perimeters and am trying to add it as a layer on ...
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0
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0
answers
19
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QGIS Automatically update intersection polygons when a source polygon changes [closed]
I'm quite new to QGIS but have worked through the tutorials and have made decent progress. I had been using Autodesk Map3D topologies to do similar things but wanted to see if it would be easier in ...
4
votes
1
answer
68
views
Labelling a marker line with distances
This question is an extension of: Turning a marker line into vertices or points in QGIS
Using QGIS (3.34.13), I want to mark distances along a line, and label them with a regular interval (1 km), ...
- 5,669
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0
answers
18
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Map Rendering in Jupyter Notebook with Folium [closed]
I'm trying to render a hill shade and vegetation map of Mexico and i'm using 'stamen terrain' as tile, the problem is that tiles requires an attribution and when i add it, my notebook displays no map ...
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1
answer
26
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How to aggregate Sentinel 2 NDVI to 10km resolution in Earth Engine
I'm trying to compute the standard deviation of NDVI scores at a 10 km grid across the UK. I am stuck at the rescaling phase, because my code apparently generates too many pixels to process. In my ...
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15
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Object based classfication vs pixel based classificaion for LULC mapping using Google earth engine [closed]
What is the most effective method for land use and land cover (LULC) mapping utilizing Google Earth Engine, particularly when evaluating both object-based and pixel-based image classification ...
0
votes
1
answer
32
views
Script that can catch QGIS network error and retry
I have a Python script that runs in the QGIS Python console. It's a long-running script that generates a bunch of maps, using an OpenStreetMap base map. The code does something like this, which ...
- 111
0
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0
answers
17
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Create an Origin-Destination map in QGIS from CSV file One Origin to consecutive Destinations
I'm trying to represent in QGIS a flow map (time series) for a CSV file which contains the following info:
field_1 = the number of the trip
field_2 = Date of the trip
field_3 = (morning) time ...
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0
answers
46
views
Find point equidistant from 3 non-colinear points in QGIS [closed]
How do I find the point* equidistant from 3 non-colinear points in QGIS?
*There is one unique point, the center of the unique circle that can always be drawn through 3 non-colinear points: Hadamard, ...
- 222
-3
votes
1
answer
36
views
Segment into polygons from points
I would like to use points ("hubs") for to create polygons ("districts") that each hub is responsible for. How do I segment a region into sub-districts in QGIS?
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1
vote
1
answer
26
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QGIS: Error with Output CRS EPSG:4326 - WGS 84 and Generating Contours
I have been using QGIS at an entry-level level. I mainly use the program to import DEM and TIFF layers from Maps Made Easy to generate contours for our projects.
Within the week, I haven't been able ...
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0
answers
26
views
Viewshed Analysis Plugin Error for QGIS Database [closed]
I am currently trying to generate a viewshed analysis using the plugin available in QGIS. however, I keep getting multiple errors before the execution. I am currently running it on QGIS version 3.40.2 ...
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0
votes
0
answers
25
views
Create a building height map in QGIS [closed]
I have a JSON file downloaded from ONEGEO containing my study area that has the "Height" attribute which is necessary to create true height 3d buildings in QGIS (at least that's what the guy ...
- 1
0
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0
answers
22
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How to get rid of leftover 'ghost' lines after merging polygons together (and deleting vertices ) in ArcGIS Pro 3.4.0
I am working with a data layer of the EPA level III ecoregions, and there was a certain section of a few states that I wanted to exclude from my map, so I used unique value symbology to set those ...
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2
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answers
29
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QGIS 3, Snapping Toolbar
I'm currently starting to use QGIS 3.26 at work (and 3.38 at home) for optical fiber network maintenance so I mainly place points for boxes then draw polylines between them for cables.
I find the ...
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0
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0
answers
6
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Persisting null values in GeoServer Vector Tile attributes
I'm using OpenLayers in combination with GeoServer to put a vector tile layer on a map. The layer itself has some features that contain properties with null values. It appears GeoServer only serves ...
- 669
4
votes
2
answers
178
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Locating TIFF layers without displaying them
I am working in a project that has many TIFF layers on a map that are not organized in the best way for me (I am taking over a project that was started by someone else). I was wondering if there is a ...
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0
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answers
8
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Overpass QL: How can an itemised list of tag's 'key' be created?
Overpass QL: How can an itemised list of tags be created?
The following routine returns an itemised list, sorted based on the number of items, for the values of one specified tag (railway stations' ...
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0
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0
answers
22
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Mathematical (geometric) relationship to transform the nadir-PSF to an off-nadir-PSF for any known viewing angle when downscaling a satellite imagery
The problem
My goal is to use a geometric relation to calculate the support and use this to guide the DS (downscaling) in some way (e.g., to allow a single DS model to estimate a range of supports ...
- 1,187
-1
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0
answers
9
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Download bicycle_parking with information for capacity from the OpenCycleMap oder OpenStreetMap
I tried downloading from geofabrik but they only have the information of where the bicycle stands are (points). But I also want the information of capacity in the attribute table. (https://wiki....
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-1
votes
0
answers
24
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Correlation between NDVI and precipitation in GEE
Why do my Pearson correlations return lower than expected values? In the literature, semiarid areas usually have a positive relationship between NDVI and precipitation, but my indices are always very ...
0
votes
1
answer
23
views
QGIS any scope for working with .sup file?
I've had an enquiry that involves working with (Wales, UK) flood data in grid format (.asc & .dat) but with an .sup file, which I have read is attribute data for the grid cells. (Tuflow was ...
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-1
votes
0
answers
19
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How to fix Error 000539 in the ArcMap 10.3 Raster Calculator [closed]
I am running on ArcMap 10.3 and have an error 000539 on raster calculator.
ERROR 000539: Error running expression: rcexec()
Traceback (most recent call last):
File "<expression>&...
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0
votes
0
answers
31
views
Appropriating CRS for Central America Map (need units to be m²) in QGIS
Currently creating a mangrove coverage map for Central America and looking for an appropriate CRS to use as I'm currently on EPSG:4326 WGS84 which uses square degrees but my data is in meters squared.
...
2
votes
1
answer
66
views
Clustering layer with points representing trees
I have more than 10,000 points in one layer. All these points have a set of fields, one of which is "Item," which contains the object's name, for example (tree names like OAK, Maple, Apple, ...
-1
votes
0
answers
37
views
Geometry of buildings in QGIS changed [closed]
I am a newbie at QGIS. I don't really know what I pressed but some of my buildings from the "gis_osm_buildings_a_free_1" layer, turned into triangles. How can I turn it back to normal?
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0
answers
20
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QGIS can't load .qml style from file
I am experiencing problems with styling the Annual Change rasters from this link : https://forobs.jrc.ec.europa.eu/TMF/data#downloads
I add the raster file as a layer to my QGIS:
I load a provided ....
- 746
1
vote
1
answer
48
views
GDAL - Curve parse error [closed]
Can someone explain me why it can't be converted?
Is there any way how to get the error message to the variable in java when gdal is used via java-bindings? It is displayed to console only when ...
- 121
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0
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15
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Tree crown detection Ecognition
I'm working on a project where I need to segment individual tree crowns. I currently have a vector that contains all the treetops together. I would need to split this. I have also tried the TREE CROWN ...
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0
answers
22
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I can't get to work the link, which should show the shapefile
I would like to use Icon Map in Power BI with ShapeFiles.
I have installed GeoServer (2.26), added Vector Tiles Extensio, and set Gridset, workspace, store and layer, but I can't connect to the saved ...
0
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0
answers
11
views
Folium - ImageOverlay behaviour with WG84 rasters
I have an unexpected result when using this code (the raster can be downloaded there: https://www.transfernow.net/dl/20250110vSXncBM0):
raster_path = '2019-06-15.tiff'
with rasterio.open(raster_path) ...
- 1
2
votes
0
answers
24
views
Label Sizes in Map Canvas, Print Composer and final Map in QGis [closed]
This is a very specific, but also a more general question. I put a small qgis project here:
https://drive.google.com/drive/u/0/folders/1rTC42PGtiQZdJH2LIW6tnHW2lJIup8Il
My issue is that I set the ...
- 1,409
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votes
0
answers
20
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QGIS GRASS r.carve cannot fine the path specified
While using the GRASS GIS tool r.carve, I receive the following error message:
What do I have to do?
0
votes
0
answers
30
views
LoadNamedStyle not working with more complex qml files
QGIS version
3.22.13-Białowieża
I'm trying to write a plugin to automate generating maps from Excel Data.
As part of this I'm attempting to style the layers using loadNamedStyle (https://qgis.org/...
- 749
1
vote
2
answers
72
views
Filling OSM relation boundary on OpenLayers map
I'm trying to add a map to a website which will display the boundaries of a large administrative region, such as a country. I'm using the standard OSM base layer and am currently only interested in ...
- 121
1
vote
1
answer
42
views
Google Earth Engine: Population count sum varies drastically with different scale parameters
I'm trying to calculate the world's total population using the GPWv411 (Gridded Population of the World) dataset in Google Earth Engine. The dataset uses approximately 30 arc-second (~1km) grid cells.
...
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0
votes
1
answer
21
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PDAL Coplanar in a WHERE statement?
I can't get Coplanar = 1 to be accepted in a WHERE condition in PDAL. I can run filters.approximatecoplanar, and I can use Coplanar in a range statement ("limits":"Coplanar[1:1]")....
- 11
0
votes
1
answer
27
views
Automatically convert shapefile to DWG via QGIS Python
I have written a small Python script that takes a KMZ line and creates a region boundary. This region is then used to import shapefile data that falls within the created boundary. I want to then ...
0
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0
answers
17
views
Recreate ArcGIS Pro "Grid Index" tool in FME
I would like to use FME to achieve the same / a similar result to the Grid Index tool in ArcGIS Pro - i.e. input a feature, it's scale and page size, and output a series of grids/boxes that surround ...
- 380
0
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0
answers
11
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How to skip output in QGIS Batch Processing for Join Attributes by Location
I've got a number of buffers and a point layer I'm trying to join together and I'm using the batch processing Join Attributes by Location function. I can create temporary outputs for the joined ...
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0
answers
8
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Missing NetCDF Sublayers in QGIS
I am updating a lab for a class that we ran two years ago with no problems. The lab involves adding a netCDF file from NASA's Ocean Surface Current Analysis Real-Time program. Previously, when we ...
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0
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0
answers
26
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How can I do spatial analysis in QGIS with showing the effect of trees in reducing temperature in a UK city (HAD-UK 1 x 1km temperature plot) [closed]
I have temperature data- HAD-UK interpolated temperature data for each 1km by 1km plot.
I have bluesky individual tree canopy data.
How can I use spatial analysis in QGIS to see the effect of trees in ...
0
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0
answers
14
views
Create non-overlapping raster from point-layer with certain buffert in QGIS
A few months back i managed to create a raster layer based out of a point-layer with coordinates. The raster was given a 5 km radius around the points that each had a center-value of 1 which decrease ...
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1
vote
0
answers
20
views
How to determine which sections of multiple routes use common roads or paths
I have a vector layer of around 1100 Linestring tracks that represent different routes taken over the last few years around a specific area. From this I want to identify the most popular route ...
2
votes
2
answers
116
views
Remove raster values above a numerical threshold
I have a set of interpolated raster files derived from a road network. Where QNEAT3 has interpolated between the road lines to make a simple outside edge, the values given in these 'white spaces' are ...
- 23