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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. …
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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). …
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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)
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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. …
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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. …
EcologyTom's user avatar
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. …
EcologyTom's user avatar
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. …
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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 …
EcologyTom's user avatar
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. …
EcologyTom's user avatar
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. …
EcologyTom's user avatar

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