Unanswered Questions

30,683 questions with no upvoted or accepted answers
29
votes
0answers
2k views

Leaflet v1 plugin: layer control for ungrouped, grouped, and nested-grouped layers

I need a Leaflet plugin which extends L.Control.Layers. I have the following requirements: works with Leaflet 1.x handles ungrouped layers alongside grouped ones handles nested layer groups does not ...
23
votes
0answers
346 views

Unit testing for QGIS 3 plugins

There is a nice resource on unit testing for QGIS. There is also a post on this, Writing automated tests for QGIS plugins, which requires the use of docker and relies on QGIS 2 plugin - QGIS Tester. ...
18
votes
1answer
1k views

Digitizing in stream mode in QGIS using a tablet

How can I digitize in stream mode in QGIS, using a wacom cintiq tablet? Freehand it's no use. I need something like MNDR stream digitizing extension for ArcView 3.x, which allows continuous tracing, ...
15
votes
0answers
751 views

Parsing file format for attributes in Raster Product Format (RPF) maps and imagery?

I'm trying to implement an open-source NITF reader (using only java, no external libraries such as GDAL or NITRO), and its mostly going OK. However I'm having trouble understanding the RPF extensions, ...
14
votes
0answers
2k views

Extract TopoJSON directly from PostGIS

I have a simple "region" table: id (TEXT), name (TEXT), geom (MULTIPOLYGON). Here's the query I can use to extract a GeoJSON FeatureCollection: SELECT row_to_json(fc) FROM ( SELECT '...
13
votes
1answer
3k views

Exporting a 16-bit image from QGIS

Could someone explain how to export a 16-bit image from QGIS ? I have imported data and coloured it as I want, but need to export it as a 16-bit image, as 8-bit is giving a terracing effect. I believe,...
13
votes
0answers
1k views

Constructing a Voronoi diagram using a complicated travel time metric

I have in my possession four sets of shapefiles: 1. Locations (points), around 1000 2. Roads (lines), each road has a speed attribute 3. Terrain (polygons), each zone also has a speed attribute 4. ...
12
votes
2answers
9k views

Downloadable, Open Source, IP GeoLocation database

I have an open source project. I need a similarly open source IP GeoLocation database i.e. IP address to country (and ideally city). Ideally with a license that allows redistribution. This is a ...
11
votes
0answers
433 views

Remove reference to raster layer object PyQGIS

I am developing a plugin to load a set of raster files on QGIS. When there is a large number of files to be loaded, the main UI freezes. So I use QgsTask to move the creation of raster layers to a ...
11
votes
0answers
481 views

High PostgreSQL/PostGIS memory and disk usage when saving QGIS project

Why would simply pressing the "save" button in QGIS cause my local PostgreSQL instance to cause memory and disk usage to spike to "Not Responding" levels? Seems to me like the ...
11
votes
1answer
2k views

Setting band names when writing multiple layer rasters using GDAL with Python?

I want to write a raster file (using GDAL+Python) with multiple bands. However, I do not know how to name the bands. Their names are always "Band 1", "Band 2", etc. I searched and ...
10
votes
0answers
180 views

Reading raster backward using GDAL

I am currently working on two-scan raster algorithms (euclidean distance transformations, cost surface analysis, etc.). Those algorithms require a line-wise forward raster scan (from top left to ...
10
votes
0answers
308 views

Accessing watershed boundary for lakes in R

I have had success accessing unique database IDs and polygons for various lakes in the US. I'm now looking to get polygons for the watersheds associated with these lakes, but have stumbled a bit. ...
10
votes
0answers
228 views

Processing post-execution script hook to clear scratch layers?

I've been cobbling together some Processing scripts for QGIS 2.18 (I'm not a fan of QGIS 3 scripts), and I keep running into one particular problem: my script creates a lot of scratch layers and they ...
10
votes
0answers
279 views

ESRI Runtime Geodatabase Shape storage

Does anyone out there know the geometry storage encoding for ESRI's Runtime Geodatabase (.sqlite) format? aka mobile geodatabase. There are 'GDB_ tables', 'st_ tables', 'RTREE indexes' and other ...

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