Geographic Information Systems Stack Exchange Community Digest

Top new questions this week:

Identifying duplicate geometries in different layers with QGIS

I'm using QGIS 3.16 Hannover under MacOS 10.13 environment. I've got two polygon shapefile layers: 'LIC' and 'ZEPA'. Some polygons (name, code & geometry) are present in both layers and I want to ...

qgis field-calculator geometry duplication  
asked by Jesús Pinilla 7 votes
answered by Jesús Pinilla 4 votes

Lowering elevation of lake using QGIS

I am in QGIS. I have a raster layer of mountains and a lake. I have a vector layer (shapefile) of the lake. It sits nicely where it supposed to be over the raster level. I am going to convert this ...

qgis raster vector stl  
asked by Jon McLaughlin 5 votes
answered by PGerrits 5 votes

Calculating distance between points only within same polygon in QGIS

I am using QGIS 3.10 and have shapefile that contains multiple polygons (1615 polygons to be precise). In order to calculate the "compactness" of the shape of each polygon I want to ...

qgis polygon point distance  
asked by Random_GIS_dude 4 votes
answered by Techie_Gus 4 votes

Use categorized style to vary textures in QGIS

I'm using categorized style to show landownership on a parcel layer on QGIS (parcel layer is polygons). Is there a way to vary by fill pattern rather than color other than changing each one ...

qgis  
asked by Brian Fisher 3 votes

Triggering "draw linestring" button using PyQGIS

I am looking for a way to activate the "draw linestring" button with PyQGIS. I had a look at this documentation: https://qgis.org/pyqgis/3.2/gui/other/QgisInterface.html But I can't find the ...

pyqgis qgis-3  
asked by Linda 3 votes
answered by Techie_Gus 5 votes

Wrong result while extracting NDVI in Google Earth Engine

I have here a FeatureCollection containing some productive forests of the company I work for. The age in month for each forest site is important to me, since my study only looks for forests that are ...

google-earth-engine google-earth-engine-javascript-api  
asked by caio.valente14 3 votes
answered by JonasV 1 vote

Repeat a QgsLayoutItem on several pages without using atlas

I am creating a script to export an attribute table in pdf format with PyQGIS 3. The number of features is different regarding the farmer's number of fields and features are sorted by the field id. ...

print-composer pyqgis-3 repeating  
asked by Juliette Lapeyre 3 votes
answered by ThomasG77 2 votes

Greatest hits from previous weeks:

House address is not listed on Google Maps

When I search for my address on Google Maps it cannot be found which means I can't order takeaway etc. Is there a way of adding my address to Google Maps or even add a street address? I want the ...

google-maps address  
asked by PriestVallon 8 votes
answered by blah238 11 votes

Layers with same coordinate system should align/overlap in ArcMap but do not?

I put 4 different layers into my ArcMap document, but only one of them will show up on the map! I should be seeing the other 3 layers as well. When I do a Zoom to layer, I can see one layer, but I ...

arcgis-desktop coordinate-system arcmap arcgis-10.0 layers  
asked by CaliforniaGirl 62 votes
answered by Get Spatial 96 votes

Differences between DEM, DSM and DTM?

I am listing some of the acronyms used in our work and had to stop to think about whether to list these together or separately: DEM: Digital Elevation Model DSM: Digital Surface Model DTM: Digital ...

terminology dem  
asked by blah238 110 votes
answered by underdark 91 votes

Getting Lat, Long of clicked location using Leaflet API?

I am using OSM with Leaflet API. Now I want to get the lat and long of a clicked location. I meant something similar to this. ex: http://openlayers.org/dev/examples/click.html map.events.register("...

openstreetmap leaflet  
asked by DomincJune 18 votes
answered by Marc Pfister 53 votes

How to change page size in QGIS Composer

I've made a few maps in QGIS Composer and set them up initially as 8.5x11 page size. I want to begin with that layout and apply it to 11x17 page size. However when I change this in the Page Layout, ...

qgis print-composer  
asked by cndnflyr 14 votes
answered by Zack 46 votes

How to read a shapefile in Python?

My question is an extension of Vertical lines in a polygon shapefile. Kindly refer to that question first. What you will see is a method of generating vertical lines with respect to the bounding box,...

python polygon line python-2.7 clip  
asked by Akhil 41 votes
answered by gene 60 votes

Converting MapInfo TAB and/or MIF to SHP using free tools or ArcGIS for Desktop core product?

How do I convert MapInfo TAB and/or MIF files to SHP using only free tools or ArcGIS itself? I've not had much luck trying to do this in the past and I don't want to have to shell out for the ArcGIS ...

arcgis-desktop shapefile convert mapinfo tab  
asked by Charles Roper 38 votes
answered by underdark 52 votes

Can you answer these questions?

Offsetting multiple points

I have a multiline shapefile and a point shapefile. The points are supposed to fall in the center of line breaks but when imported to qgis, the points fall on one end of a line break. Is there a ...

qgis point offset  
asked by sudofizz 1 vote

Drawing polygon around a raster (only where pixels have data) QGIS

I have a raster (grey scale image with white background [can change to e.g. green]). I want to make a polygon of the extent of the pixels with data (outline)- not the whole raster file. How can I do ...

qgis raster qgis-plugins  
asked by Matthew 1 vote

Spatial join (Points to Polygons) joining points that do not fall inside polygons to attribute table

I am using ArcMap 10.6.1 and am having trouble with a spatial join. I have created 250km buffer polygons around some of my sampled data points and I am now trying to join some modelled data to those ...

arcgis-desktop arcmap attribute-table attribute-joins spatial-join  
asked by Adam Porter 1 vote
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