Geographic Information Systems Stack Exchange Community Digest

Top new questions this week:

Closing connection to SpatiaLite DB in QGIS

I have a SpatiaLite DB that has been used to generate some layers in QGIS (via a PyQGIS script, using the native:extractbyextent processing tool). Once these layers have been generated, they are saved ...

qgis layers spatialite connection  
user avatar asked by Tom Brennan Score of 4

Integrating an External Python Script into a QGIS Project Macro

Is it possible to integrate an external Python script into a QGIS project macro? I have a relatively large macro that executes various Python commands at the start and end of the project. For better ...

qgis python macro  
user avatar asked by MartinMap Score of 4
user avatar answered by Comrade Che Score of 3

Using QgsProcessingParameterEnum in QGIS Python processing script

I am currently working on a processing script for QGIS. In the function def initAlgorithm() I am defining several parameters. One of the parameters is using QgsProcessingParameterEnum with a pre-...

pyqgis qgis-processing  
user avatar asked by kopi Score of 3
user avatar answered by user2856 Score of 7

How to stretch an image into polygon symbology on QGIS?

I have a world map polygons (vectors) on QGIS 3.28, and i want to add flag on each country. I have already a svg flag for each country on a field, but flags are represented like a mosaic: I try to ...

qgis qgis-3 symbology  
user avatar asked by Rien Avoir Score of 3
user avatar answered by Rien Avoir Score of 5

How to snap a line on a grid / cell edges?

What I want to do : This question is about finding an equivalent path on a grid to a given line. The following image shows what I am trying to achieve : Starting from a generic line (in red), I want ...

raster line qgis-processing snapping shortest-path  
user avatar asked by TC_Blue Score of 3

Snap polyline to another polyline's vertices

I have got a polyline layer which has its own vertices (blue line in image below) and another polyline layer with a slightly different alignment and vertices in different locations (red line in image ...

qgis line snapping  
user avatar asked by Sken2107 Score of 3
user avatar answered by Babel Score of 3

Is it possible to get features by the WFS vector driver in a coordinate system that is not the default srs regarding the WFS capabilities?

We currently experiment with the gdal java bindings to receive data from a WFS service. Regarding the WFS specification a FeatureType must define its default coordinate system (Tag DefaultCRS). We ...

gdal wfs ogr  
user avatar asked by Alexander Schlottmann Score of 3
user avatar answered by user30184 Score of 1

Greatest hits from previous weeks:

Differences between triangulation and trilateration

Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense. What is the correct sense of Triangulation and what are the differences from ...

gps gis-principle trilateration triangulation-survey triangulation  
user avatar asked by adev Score of 41
user avatar answered by R.K. Score of 37

Layer creation failed: Read-only file system

Ran into this error while trying to create a shapefile layer for training sites in an object segmentation project. This is an issue with QGIS itself, as I tried to create new vector layers on previous ...

qgis environment-variable  
user avatar asked by Rob Score of 10
user avatar answered by Rafael Sisto Score of 20

Locating property corners using plat map description?

I am interested in a piece of property for which I have a plat map description, giving what seem to be latitudes/longitudes of lines along the boundaries (not sure about this). The objective is to ...

gps latitude-longitude land-survey metes-and-bounds township-range-section  
user avatar asked by Wascally Wabbit Score of 9
user avatar answered by Chris W Score of 15

Why does GPS positioning require four satellites?

I have a question on the GPS positioning algorithm. In all books I've read for 3D positioning we need four satellites, and I don't understand why. We need to calculate three variables: x, y, z. We ...

user avatar asked by matekm Score of 57
user avatar answered by Kirk Kuykendall Score of 62

Labels not appearing on any layer in ArcMap?

Not sure what the issue is, but I'm unable to get labels to display in ArcMap 10. The obvious things are accounted for (as far as I know). Labels are set in Properties, layers are checked to label in ...

arcgis-desktop arcgis-10.0 labeling  
user avatar asked by Jacques Tardie Score of 16
user avatar answered by Jacques Tardie Score of 3

EPSG 3857 or 4326 for Web Mapping

The discussion at What is the difference between WGS84 and EPSG4326? shows that 4326 is just the EPSG identifier of WGS84.. Wikipedia entries for Google Maps and OpenStreetMap shows that they both ...

coordinate-system leaflet openstreetmap google-maps web-mapping  
user avatar asked by tmaj Score of 250
user avatar answered by Devdatta Tengshe Score of 276

Getting coordinates from click or drag event in Google Maps API?

I have made a Google Version 3 Geocoder , I want to be able to pick up the coordinates of the marker when it is dragged or clicked. Below is my code: <!DOCTYPE html> <html> <head> &...

google-maps-api html  
user avatar asked by Blake Loizides Score of 12
user avatar answered by EZMapdesign Score of 10

Can you answer these questions?

Can I rotate and square the Landsat 8 images without causing loss in the characteristics of the image itself?

I downloaded images from the Landsat8 level-2 satellite because I want to segment glacial bodies, since I have not been able to find an available dataset I want to create a dataset, but I do not want ...

image-segmentation deep-learning  
user avatar asked by Andres Benjamin Quispe Quispe Score of 1

How can I detect which geometries degenerate into lines on running QGIS difference tool

I run difference tool between two area layers. Sadly, it failed with "Could not add feature with geometry type MultiLineString to layer of type MultiPolygon" It seems that some of geometries ...

qgis differences  
user avatar asked by reducing activity Score of 2

Remove OGR_STYLE field while/after writing

I'm using an OGR_Style field to set the styles for a MapInfo Tab file with Geopanadas. Does anyone know if there's a way use the OGR_Style field for styling but not include it as a field in the file?

python geopandas mapinfo fiona  
user avatar asked by Prosper Score of 2
user avatar answered by user30184 Score of 0
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