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Results tagged with qgis
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user 65021
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
1
vote
How to convert a single band to multi-band raster?
Here are screenshots from QGIS 3.10 to help:
Search for "Translate" in the Processing Toolbox menu. …
- 571
0
votes
Calculate surface area of polygon within the lines of another polygon
If I understand your question correctly, you could try Vector > Research Tools > Select by Location and choose the features in the Tree cover layer which intersect with your Provinces layer. Then save …
- 571
2
votes
0
answers
259
views
Reprojecting raster in QGIS gives nan
I'm trying to reproject raster layers in QGIS. At the moment they are in ESPG:4326 and I want to convert them to ESPG:54009. (Using Save As... and changing the CRS). …
- 571
2
votes
1
answer
378
views
Rename cells in Attribute Table to 'XXX.$ID'
I feel like this should be easy to answer, but I can't get it to work for me. I need to edit the attribute table of a .gpx file before I load it into my GPS, in order to label the points. I can rename …
- 571
0
votes
Accepted
Rename cells in Attribute Table to 'XXX.$ID'
I just didn't know what I needed to search for. I've now discovered the concatenate option under "String > concat". To solve my problem I used the expression; concat('500m.',$ID)
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0
votes
1
answer
260
views
QGIS raster calculator gives 'Nan'
With QGIS 2.14.3 I am attempting to convert a raster layer to a binary layer, using a certain threshold. …
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0
votes
0
answers
99
views
Why do merged rasters in QGIS look 'patchy'?
Poor title for this question, but I can't think of a better way to explain it.
I have merged two rasters. I want the joins to be seamless, but there is an obvious line where they meet...
I've trie …
- 571
1
vote
0
answers
2k
views
Resolving geometry errors in QGIS?
I have read the pages here, here and here, and looked at the SE questions:
Repairing geometry using QGIS?,
Cleaning polygon after using dissolve to repair geometry in QGIS? … and
Fixing geometry validity errors in QGIS?
amongst others, and the GRASSwiki pages. …
- 571
2
votes
0
answers
332
views
Retain colours when converting three-band to single-band raster in QGIS
I have a three-band raster:
I would like to convert this to a single-band raster using QGIS, but retain the colours from the three-band version. …
- 571
5
votes
Creating Square Buffer in QGIS?
Here is an approach I used in QGIS 3.16, I hope it might be useful for others:
Create polygon centroids
Buffer centroid points by desired distance. …
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3
votes
1
answer
619
views
Display both edges of adjoining polygons in QGIS
I have a two category polygon layer. Where two polygons of different categories meet, one is always overlaid by the other so that you cannot see both edges even though the polygons are not overlapping …
- 571
3
votes
QGIS equivalent to the ArcMap Zonal Statistics as Table
To extract values for each land cover type (closer to Arc's Zonal Statistics as Table) you can create an indicator grid for each land cover type as shown in this answer
Edit
As of QGIS 3.2 there is a Zonal …
- 571
0
votes
0
answers
81
views
Error clipping raster in QGIS?
I am trying to use a polygon shapefile to clip a raster, but it gives me "Clipping Error 1: Cutline polygon is invalid", and a blank raster as output.
This is similar to this question, but the answer …
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0
votes
Accepted
QGIS Dissolve tool erroneously fills rings in polygons
Unfortunately, these were not picked up with the QGIS check and fix geometry tools. …
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0
votes
Accepted
Proportion of polygon classes in each multi-ring buffers
In the end I followed this work flow;
Converted the land cover classes to numbers
Rasterised the landcover shapefile (Raster > Conversion > Rasterize)
Used the zonal histogram tool to calculate the …
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