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Geographic Information Systems : Recent Questions and Answers (Page 28)

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

How can I align roads to follow hex bisection paths in QGIS?

I've created a hex grid and I would like to align and simplify each road such that each road segment has basically 2-3 vertices within each hex:Entry side (centered on...

Asked on 11/09/2021

0 answer

Drawing polygon constant km around point in lat/lon coordinates in QGIS3.12

I have a set of points in lat/lon coordinates over Europe representing pixels from a satellite dataset. I know each pixel has size 10x10km. I want to draw a square...

Asked on 11/09/2021

0 answer

Loading shapefile into PostGIS: ${TRAINING_ROOT} Directory

I try to follow this tutorial (link below: Loading shp file into PostGIS), however I dont understand how do I get to the $TRAINING_ROOT directory? It always tells me: No...

Asked on 11/09/2021

2 answer

Set number of columns and rows with PyQGIS

I know how to resample a raster using pyQGIS 3.0 and the gdal warptranslate function by imposing the pixel dimension of the output file, see below.rasterLayer = QgsRasterLayer('/path/inputfile.tif', 'raster')...

Asked on 11/09/2021

1 answer

Reading, displaying and modifying a raster using Java

I am new to the Geotools library. The idea is to display and be able to modify a raster in java with the said library. I referred to the code...

Asked on 11/09/2021

0 answer

How to remove false strip lines from UAV LiDAR data

I have a multiple return UAV LiDAR point cloud and it has false strip lines 0.5-1 m below ground. I think two different flight lines are not overlapping perfectly causing...

Asked on 11/06/2021

1 answer

Changing coordinates of geotagged photos

I've geotagged photos stored locally on my computer, which were converted into points. But I am not happy about where those points are placed by (not very accurate GPS). On...

Asked on 11/06/2021

3 answer

Creating Accuracy Assessment Points gives Error 999999 in ArcGIS Desktop?

I am using ArcGIS Desktop 10.6.1. I am trying to create 500 stratified random accuracy assessment points for my raster generated using the supervised classification tool (followed by the...

Asked on 11/06/2021 by Marie Hoerner

1 answer

Distance between points along line

How do I determine the distance between points to the neighbor point that connected via the line(road)? In QGIS 3.8.3 I have tried v.distance and v.net.distance but they do not...

Asked on 11/06/2021 by Lysander Gustin

1 answer

Writing into XMP and EXIF Metadata from attribute table values in PyQGIS

I've already learnt how to read EXIF and XMP data's from JPG. Now I would like to write from value in attribute table into their XMP and EXIF tags. This...

Asked on 11/06/2021

2 answer

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