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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.
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 …
- 77.9k
1
vote
2
answers
300
views
Issues reprojecting Hydro 1k to WGS84
I'm using QGIS (ver. 2.14.3), I would like to reproject these files to EPSG 4326 - WGS84. I can run Raster > Preojections > Warp, setting the Target SRS to WGS84 and it runs without apparent errors. …
- 20.3k
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 …
- 66.5k
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. …
- 571
1
vote
0
answers
327
views
SAGA not working in QGIS 3.16 on Mac OS 11.2
There seem to be recurrent issues integrating SAGA with QGIS. However, all the answers and workarounds are either for older versions of software, or for different OS. …
- 1
1
vote
3
votes
Rounding pixel values of raster in QGIS
I didn't get it right first time though, so just to save anyone else similar problems, here are some more details for QGIS 3.10. …
- 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
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
4
votes
Zonal statistics per raster category in QGIS?
Update:
As of QGIS 3.2, there is the Zonal Histogram tool which should perform this automatically, saving the need to create multiple indicator grids (see original answer). …
- 571
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. …
- 571
0
votes
1
answer
103
views
QGIS Dissolve tool erroneously fills rings in polygons
(Same result in both QGIS 2.14 and 3.4). …
- 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 …
- 571
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 …
- 571
1
vote
2
answers
214
views
Proportion of polygon classes in each multi-ring buffers
I have a landcover map with many irregular polygons, with each polygon a uniform habitat type. I have a second shapefile of points, and a third shapefile with multi-ring buffers around those points. I …
- 571