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Geographic Information Systems : Recent Questions and Answers (Page 5)

Find answers to your questions about Geographic Information Systems or help others by answering their Geographic Information Systems questions.

Assigning attribute by location for multiple layers

I am trying to assign values by location of one of my polygon layer. It is overlayed by multiple polygon layers and I want to assign the value of the...

Asked on 12/27/2021

0 answer

Interactive filtering histogram widget with cartoJS

I would like an interactive filtering histogram widget like this one https://public.carto.com/builder/0c982e6d-b254-4e2b-86ed-e0f097f519c2/embed (the population density histogram widgets on right bottom of screen). When you click or select...

Asked on 12/27/2021

1 answer

Show datapoints in WGS84 EPSG4326 on basemap with Pseudo-Mercator Projection

I want to show datapoints in WGS84 EPSG 4326 on one of the basemaps of QGIS, which (as far as I know) come with a Pseudo-Mercator Projection EPSG 3857. If...

Asked on 12/27/2021

0 answer

WMTS : Convert geolocation (lat, long) to tile index, at a given zoom level?

I wanted to know how to get the indexes (x,y) of a WMTS tile for a given geolocation (latitude, longitude) and zoom level. For exemple, I have a POI located...

Asked on 12/25/2021

1 answer

How to rasterize a river vector file and merge it to another raster layer?

I got a river vector file.I want to rasterize it so that the river is 2 pixels wide.How do I achieve that in QGIS 3.2.3? When I try...

Asked on 12/25/2021

2 answer

Plot GeoTIFF using tm_rgb from R tmap package

I've exported a raster object from QGIS into GeoTIFF format and imported it into R as a raster brick using the brick() function from the raster package. The file is...

Asked on 12/25/2021

2 answer

NetTopologySuite: How to convert Polygon into LineString?

I have a load of GeoJSON which represents roads that are defined as Polygons in the data. I wish to convert them into a simpler representation so as to reduce...

Asked on 12/25/2021

1 answer

How to cut segments of a LinearRing with another Geometry using NETTopologySuite?

I have two linear rings, A (green) and B (red). I want to include all intersection points between two geometries in A. ...

Asked on 12/25/2021

1 answer

Shapefile To svg to dxf and back to shapefile

I need to edit a complex vector polygon layer based on a raster layer. It will be a lot easier for me to do the drawings in an illustration software...

Asked on 12/25/2021

0 answer

Geoserver CQL filter with many “IN” conditions

I am using Geoserver to generate colored regions on a map a wms link, CQL condition can contain a long string of "IN". Max number of INs could be up...

Asked on 12/25/2021

1 answer

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