Geographic Information Systems Stack Exchange Community Digest

Top new questions this week:

Creating vector (with lines/polygons) from raster based on paper map in QGIS

For a task I have several maps created with GIS that look like the following: I am mainly interested in the colored zones that aren't roads (red) or rivers (blue) and would like to turn these into ...

raster qgis-3 convert image vectorization  
asked by Weece 8 votes
answered by Kazuhito 7 votes

Changing vertex order for polygons in QGIS?

I have this intersection of a polygon, see image below I would like to redraw the lines so they don't cross each other. So, in the end, I would like to have a polygon without self-intersecting ...

qgis polygon vertices order self-intersection  
asked by Linkinpark 5 votes
answered by gHupf 6 votes

Merge/join only the lines which are snapped to vertices in QGIS

I have polygons drawn with AutoCAD as Mline (Multiline type) which are rendered in QGIS as 8 segments for each feature. An example of one selected feature is shown in the picture below: I want to ...

line merge snapping  
asked by Xavier Michael 5 votes
answered by GSienko 0 votes

Use field calculator QGIS: if value in one column, then value in new column

I am having troubles using the field calculator to get what I want. One column in my attribute table is named 'Taxa' and has a set of species in it. Species are separated by #. I want to make a new ...

qgis field-calculator calculate-values  
asked by Tom van Heusden 5 votes
answered by she_weeds 3 votes

QGIS geometry error:Hole lies outside shell

I am using QGIS 3.8 and I am using a layer from OSM of Tokyo city. The layer is consisted from many polygons and I have tried to merge it but I got error. This is how the original layer was look ...

qgis geometry merge error  
asked by Reut 4 votes

Processing toolbox not working in QGIS 3.4.13

The processing toolbox stopped working in the previous QGIS 3 ltr version I had installed. Now installed 3.4.13 but processing toolbox still not working. I've tried changing the GRASS path without ...

qgis-3 grass qgis-processing  
asked by Sean Jarrett 4 votes
answered by Gabriel De Luca 2 votes

Making curved stroke shape of polygon

I have a lot of polygons representing Forest land use type. Is it possible to style these polygons in such a way like on this picture? Example polygon I have now: So the polygon doesn't have ...

polygon qgis-3 symbology cartography  
asked by icelandico 4 votes
answered by Gabriel De Luca 5 votes

Greatest hits from previous weeks:

Getting coordinates from geometry in PostGIS?

This line: SELECT geom FROM myLayer.geom will return a hex value. How would I get decimal values, which is a human-readable coordination?

postgis convert geometry coordinates decimal-points  
asked by Kourosh 60 votes
answered by user1702401 53 votes

Difference between WMTS and WMS?

What is the main difference between a Web Map Tile Service (WMTS) and a Web Map Service (WMS) When should you choose one over the other? What are the (dis)advantages by choosing one ...

wms wmts  
asked by Edward van Raak 63 votes
answered by AndreJ 44 votes

Windows security warning (ActiveX) when clicking into fields in ArcToolbox tool?

I have been running ArcGIS 10.5 on my PC (Windows 10 Home) since December with no issues. This past week I have started to get ActiveX Security Warnings when I click into a parameter field in any ...

arcgis-desktop arctoolbox security arcgis-10.5  
asked by Midavalo 33 votes
answered by Mgamerz 12 votes

Calculating Latitude/Longitude X miles from point?

I am wanting to find a latitude and longitude point given a bearing, a distance, and a starting latitude and longitude. This appears to be the opposite of this question (Distance between lat/long ...

distance algorithm spherical-geometry haversine  
asked by Jason Whitehorn 46 votes
answered by Kirk Kuykendall 21 votes

Joining data from Excel to attribute table in QGIS without creating duplicates?

I have an attribute table with two empty fields in QGIS. I want to import an excel database to fill my empty fields in QGIS. My excel file matches the columns in my QGIS attribute table. I am ...

qgis attribute-table attribute-joins excel  
asked by Laurent Robitaille-Lainesse 15 votes
answered by RutgerH 13 votes

Adding new address to Google Maps?

I can't see my home address on Google Maps as it is a new neighbourhood. How can I get my home address added into Google Maps?

asked by Ashit Vakil 4 votes
answered by Matt Goodman 3 votes

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  
asked by Blake Loizides 12 votes
answered by EZMapdesign 9 votes

Can you answer these questions?

Mapbox Android basics: import com.mapbox.mapboxandroiddemo.R

I am trying to rebuild the example code of the Mapbox first steps tutorial for Android Studio ( But I am struggeling with an import ...

java mapbox  
asked by Jones 1 vote

Is there a way to add i18N to a SLD export from QGIS?

I have created a SLD from QGIS and I want to add localization (i18n) in GeoServer following the steps from the documentation: ...

qgis geoserver internationalization  
asked by Rodrigo 1 vote

Adding a tab to the QGIS project properties

I would like to know, if there is the possibility to add new tabs to the QGIS project properties? (for example, under the "QGIS Server") The goal is to have the advanced options of a QGIS plugin ...

qgis python qt-designer  
asked by Nunkuat 1 vote
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