Geographic Information Systems Questions, Problems & Solutions : TransWikia.com ~ Page 76

Creating new polygon in between other polygons?

I want to fill the missing space and create a polygon out of it. How do you do that with QGIS? The missing space is the white part between the...

Asked on 08/23/2021

1 answer

Including float value in loop processing of Surface Volume tool using ArcMap ModelBuilder

How do I use the Surface Volume tool in ArcMap via Model Builder, without using Python, to process a set of multiple float values in a loop, since an...

Asked on 08/23/2021

3 answer

Extract field's names in R without reading the file

I was wondering if it's possible to use the R package sf for extracting the names of the fields in a file without reading it. For example, I would like...

Asked on 08/23/2021 by agila

1 answer

How to read geometry from gpkg?

I have a gpkg file. I trying to open it with spatial_lite gui and cast geometry to GML.select AsGML(geom) from MyTablebut i got null. I tried another functions AsText(),...

Asked on 08/23/2021 by Kliver Max

1 answer

Trying to set custom projection for shapefile in QGIS

I'm trying to open and use a dataset (in the form of a shapefile) (https://webarchive.iiasa.ac.at/Research/FOR/forest_cdrom/data/landscapes/landscapes.zip) with QGis. The readme of the dataset says following about projection:Projection:...

Asked on 08/23/2021

2 answer

Fitting rectangle with maximum area inside polygon in PostGIS

I am looking to fit a rectangle inside a polygon which would have the maximum area for the rectangle. I tried using ST_OrientedEnvelope(geom) but this would give the rectangle fitted...

Asked on 08/23/2021

2 answer

Open raster referenced in attribute column of vector layer

I have a polygon layer. One of the columns holds an absolute path to a (georeferenced) raster. Is there a way to (programmatically) open this raster in QGIS and add...

Asked on 08/23/2021

1 answer

Zonal statistics per raster category in QGIS?

I have a raster layer of land use and a vector layer of areas of interest. I would like to calculate for each polygon (areas of interest) the proportion or...

Asked on 08/23/2021 by Victor Cazalis

1 answer

Automated image enhancement in Python

I'm using Landsat 8 imagery in Python and want to make true color images that would look good in a publication. I have many images, so ideally this would be...

Asked on 08/23/2021

1 answer

Opening vector layer via URI with spaces

I try to open a Pelias REST API link that returns GeoJSON with add vector layer (Ctrl+Maj+v) in QGIS. If i try http://localhost:4000/v1/search?text=belgium, it's ok.If i...

Asked on 08/23/2021

1 answer

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