All Questions
Tagged with resampling qgis
48 questions
-4
votes
2
answers
211
views
How does one resample a 20m resolution satellite image to 10m resolution, such that it matches a native 10m resolution image?
I am trying to use Python to perform my GIS analysis.
Background:
I have 2 satellite images, one with 20m resolution and a second with 10m resolution.
Goal:
Have both satellite images at 10m ...
- 91
0
votes
0
answers
114
views
How do I resample a raster layer over another layer in QGIS 3.x?
I have 2 raster layers (the full same area):
Layer 1: 30 m resolution, coordinate system is EPSG:32643, layer size is 7406x6801;
Layer 2: 10 m resolution, coordinate system is WGS 84, layer size is ...
- 65
3
votes
1
answer
258
views
Generating DEM that gives realistic contour
I am quite new QGIS user. I have point data from the field and I generated DEM and contour. However, the contours are a bit unrealistic. I have attached the image. The green contour is the contour ...
- 147
0
votes
1
answer
274
views
QGIS - keep square pixels in resampling
I have a raster file (asc) with a resolution of about 10m, square pixels and an extent of X: 15929 Y: 16159. I am trying to resample this to a larger resolution (tried 20 and 30m). However, the output ...
2
votes
1
answer
553
views
QGIS simple downsample of a raster
I'd like to downsample a DEM raster from 2m per pixel to 8m. I've tried using SAGA Multilevel B-spline interpolation (from raster) as suggested here, but though that results in an 8m resolution it ...
- 163
1
vote
1
answer
80
views
QGIS Raster resampling without label changes
I am working on raster data that which is in a 5x5 meter resolution. I need to resample this to a 25x25 meter resolution. I have used resample.stats which works, but changes the label numbers into one ...
- 153
5
votes
1
answer
1k
views
Which resampling method to use when georeferencing with QGIS/GDAL
Using Georeferencer in QGIS (which in fact uses GDAL library), in transformation settings you can define the Resampling method as can be seen on the screenshot. I am wondering on what it depends which ...
- 74.9k
3
votes
1
answer
1k
views
Reducing resolution of raster layer in QGIS: "Save as..." or "Align Raster..."?
In QGIS (Version 3.22), if I need to change (reduce) the resolution of a raster layer, I can simply choose "Save as.." from the "Layer" menu or I can use the "Align Raster&...
- 1,601
0
votes
0
answers
67
views
Downsample large raster without reprojecting first
How can I downsample a large TIFF (raster) which is projected in decimal degrees without first having to reproject it to meters. I know that in meters the resolution is 3cm and I want to downsample to ...
- 635
1
vote
2
answers
759
views
SRTM raster looks pixelated with hillshade style in QGIS when zooming in
I have a project and I want to create a map using SRTM as a background.
I upload it ... and it looks like that:
But my project area is smaller, so I need to zoom it ... and when I do that, my SRTM ...
- 19
4
votes
3
answers
2k
views
QGIS: Resample (upscale) raster using a Gaussian filter
I want to resample a raster from 15m to 460m using a Gaussian filter.
The goal
I am having a coarse image which I want to downscale. I also have a fine resolution band to assist the downscaling. The ...
- 1,167
3
votes
2
answers
473
views
QGIS - Converting Vector to Raster and back to vector to resample resolution of vector data
I would like to convert my polygon data into a raster file to change the pixel resolution and then would like to convert it back to polygon data since this will allow it to be resampled to another ...
- 91
1
vote
0
answers
145
views
Anti-alias raster layer by upscaling/ resampling
Recently, I performed a VGA analysis using Depthmap X. I moved the date over using a Mapinfo file (vector) and rasterised the values to the associated pixelsize. The analysis was conducted at a 2m ...
- 361
0
votes
1
answer
601
views
Resolution of Python GDAL-generated GeoTiff different from plotted image
The Situation
I use the GDAL library to warp geotiffs (subsequently referred to as "rasters") of different resolutions (30m and 500m) to a 100m (subsequently referred to as "default&...
- 149
1
vote
0
answers
885
views
Build VRT to merge overlapping rasters always takes max values?
I'm attempting to merge two overlapping rasters from the same source with the same resolution. I would like the overlapping pixels to take the average value of the two overlapping pixels. When I ...
- 717
2
votes
1
answer
350
views
Resample layer but keep RGB bands (QGIS)
I have an orthophoto from a drone with a spatial resolution of 0.02m and would like to reduce the resolution to 1m. The simplest way of doing this is using the export>save as>and manually fill ...
- 635
0
votes
1
answer
561
views
Downsampling GeoTIFF in QGIS using GRASS
I need to downsample a GeoTIFF image. I have been trying to test this using a simple example like using the following r.samp.res dialog.
(I know I could also export the TIF file directly following ...
- 111
3
votes
2
answers
479
views
Differencing two rasters with very different resolutions (QGIS 3.20.3)
I am having a problem with analysing two rasters with 2 significantly different resolutions.
Background on the two rasters:
DEM is the ALOS_30m DEM which is in the WGS_84 format. Merged together ...
- 51
1
vote
0
answers
326
views
QGIS merging grid cells together changing resolution from 250x250m to 500x500m [closed]
I want to change the resolution of a grid in QGIS and can't make it work. I have checked the site for similar problems but couldn't find a simple and good solution.
My Grid looks like this:
and I ...
- 11
1
vote
0
answers
84
views
Using RasterResampling with PyQGIS
I have a Python application and it uses PyQGIS to - read NetCDF file, convert it to GeoTIFF by writing the rasterlayer with rasterpipe, QgsRasterFileWriter and rasterShader related methods.
However, ...
- 11
8
votes
2
answers
8k
views
Aligning two rasters of same resolution perfectly on top of each other in QGIS
I have two rasters, that I managed to make in the same resolution using the 'Raster tools --> Resampling' tool by SAGA. The pixel sizes are exactly the same, however the new resampled raster, in ...
- 141
1
vote
1
answer
538
views
QGIS - raster resampling having no effect=pixelization
In QGIS I cannot make the resampling setting (changing it from nearest neighbour to bilinear or cubic) to smooth the pixels of Sentinel-2 imagery, both as jp2 or tif. If I export the image, convert it ...
- 11
1
vote
0
answers
256
views
GDAL cubic oversampling problem
I am trying to oversample a part of a big GeoTIFF DEM to display it as a hillshade. I'm doing the process in 3 steps:
extract a part of my GeoTIFF
oversample that part
generate the hillshade with ...
- 604
0
votes
0
answers
307
views
Resampling for cellsize when exporting raster to GeoTIFF - GM
I used Global Mapper v20.0 for exporting the raster image GeoTIFF (32bit, from cellsize x= 0.008333333333000000898 arcdegree, y= 0.008333333332999999163 arcdegree) to cellsize x= 0....
- 1
2
votes
0
answers
74
views
Resampling while drawing rasterfiles in QGIS 3?
I can not find a solution to resample my rasterfiles in QGIS 3. With Arcmap usually I use "resample while drawing" with the method cubic or bilinear interpolation for continuous data to smooth my ...
- 21
0
votes
0
answers
723
views
Resampling raster with rectangular pixels
I have a raster file of deforestation but the pixeles are not square. When I project the raster the information of it says that the pixel size is 0.000275322,-0.000271395. I would like to resample the ...
1
vote
0
answers
137
views
matching up cells in 2 raster layers
I've been trying to get 2 raster layers to match up, so the cells are in the same locations for both layers (they have the same resolution already). But I can't seem to figure it out, already tried ...
- 11
7
votes
2
answers
2k
views
How does oversampling work in WMTS layers?
(This question arises as a sub-topic of the answer provided here.)
In the symbology options for a raster layer in QGIS, there is a setting called "Oversampling" (see image below). How does this ...
- 1,314
14
votes
1
answer
1k
views
Understanding raster symbology settings
I am trying to understand how to use the symbology options for raster layers in QGIS, particularly the Resampling options, but the official documentation only mentions the setting very briefly and ...
- 1,314
1
vote
2
answers
2k
views
Resampling raster based on mask raster?
I want to resample rasters of e.g. 2 m resolution to the same raster cell size and projection of an existing raster (25 m). However I cannot really find answers how to do it properly. I managed to ...
- 19
1
vote
1
answer
317
views
Resampling Modis and Sentinel 2 rasters
I am resampling Modis and Sentinel 2 rasters in QGIS. I am working with surface reflectance values and I am having trouble obtaining the results that I am looking for. I have isolated my rasters down ...
3
votes
0
answers
2k
views
Changing Raster Resolution to match other Raster in QGIS
I have a raster layer of 0.125 degree resolution and another raster layer of 0.0833 degree resolution. Both the raster layers are to be overlapped. So, I want to change the resolution of 0.0833 ...
- 319
7
votes
1
answer
4k
views
Resampling method used in QGIS Raster save as? [duplicate]
I have what seems like a simple question, but I haven't been able to find the answer in the QGIS documentation.
I have a raster that is 250 m resolution, and I want to resample it to 1000 m ...
- 387
2
votes
2
answers
285
views
QGIS clipper tool misaliagnment
I'm using QGIS 2.14 and GDAL 1.11.3 and I'm running into a weird error with the clipped outputs. I created a shapefile in QGIS and used it to clip my image. Here's a simplified version of the ...
- 133
1
vote
0
answers
1k
views
Change pixel size of 30m for 23.5m in QGIS [duplicate]
I need to change pixel size in raster file file with Pixel Size = (28.086057277202915,-28.086057277202915) using Qgis for Pixel Size = (23.951601289061028,-23.952379920305706) what kind of function I ...
- 175
5
votes
2
answers
2k
views
Changing pixel size in 'asc' file using QGIS?
I have soil data and BioClim data from Australia
soil data:
rows 2200
columns 1400
pixel size 0.0025, -0.0025 255
BioClim data:
rows 660
columsn 420
pixel size 0.00833333, -0.00833333
I am ...
- 291
3
votes
1
answer
710
views
Reducing number of points, keeping most recent data within given distance, using QGIS?
I have a HUGE dataset of points that were collected along a route. The data may change daily, and the most recent data is the most important. What I would like to do is take only 1 point from a given ...
- 495
1
vote
1
answer
400
views
Saga:processing resample extent in python editor QGIS
I would like to resample many geotiff layers to another geotiff layer's extent and pixel size. For this I would like to use the QGIS python console (editor). When I run my script it raises the ...
- 3,355
4
votes
0
answers
387
views
Reprojecting a population raster from LAEA to lonlat
I have a population density raster from the EEA which is based on the CORINE land cover 2000 data.
http://www.eea.europa.eu/data-and-maps/data/population-density-disaggregated-with-corine-land-cover-...
- 285
4
votes
1
answer
2k
views
Gdal/QGIS resampling asc file
I have a DEM (.asc) file with a resolution of 1000 meters per pixel. Therefore the file has a lot of columns and rows.
I would like to chance the resolution per pixel from 1000 to 3000 meters per ...
- 375
2
votes
0
answers
232
views
Align & Sum Grids in Python
I have two grids.
One, call it A, is 4320x2160 cells and spans the whole globe.
The other, call it B is 8640x3432 and spans the circumference of the globe, but is clipped toward mid-latitudes.
Both ...
- 1,831
3
votes
1
answer
366
views
Resampling with Python console (QGIS): number of parameters
I am trying to resample two raster layers with Python console in QGIS with this code:
outputs_0=Processing.runAlgorithm("saga:resampling", 'G:/DOCTORAT/2014/Incendis/Dades/LST/LST_TERRA/Tiff/...
- 31
6
votes
1
answer
8k
views
Best Resampling Method for DEM reprojection in QGis
I need to reproject a DEM (raster file) in order to have the same CRS as all my other project data - I have different shapefiles for the same DEM's location but they have a different CRS.
Which ...
- 119
3
votes
2
answers
9k
views
How to resample a raster to higher resolution in QGIS?
I'm fitting a SDM using R. A requirement is that all environmental predictor layers have the same extent, origin and resolution.
I have high resolution bathymetry data (25m) that I will resample to ...
- 61
30
votes
4
answers
71k
views
Resampling GeoTIFF images to same resolution using QGIS
I have two geotiff images that I would like to resample the same resolution.
If I use ArcGIS Desktop this is easy to do but how do I do this using QGIS?
- 597
7
votes
1
answer
1k
views
Can extracting raster values work in polygons' CRS without raster resampling?
I am trying to extract raster values using polygon layer with different CRS. Raster is in WGS84 (EPSG:4326) and the polygons in UTM (EPSG:23031).
1. If I want to work in the projection of the ...
- 1,262
2
votes
1
answer
341
views
Lack of Options in Gdal Tool "Build Overviews" QGis
I am using QGis 1.8 and I want to build overviews (pyramids) for satellite imagery using the Gdal Tool. I would like to use the resampling method "cubic convolution", but the option doesn't exist ...
2
votes
1
answer
407
views
Differences in raster extents in gdalinfo, SAGA & QGIS after resampling [closed]
I recently resampled a raster file using SAGA's Resampling module. The aim was to widen the extent of the new raster to two decimal places, where the original raster has three decimal places. The ...
- 537