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30 votes
4 answers
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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?
Gil Gonçalves's user avatar
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 ...
Nathan's user avatar
  • 1,314
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 ...
Andrea Rey's user avatar
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 ...
Nathan's user avatar
  • 1,314
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 ...
Sam Zipper's user avatar
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 ...
Tomas's user avatar
  • 1,262
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 ...
Rui Prata's user avatar
  • 119
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 ...
SteveResearch's user avatar
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 ...
Babel's user avatar
  • 74.9k
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 ...
Duddel's user avatar
  • 375
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 ...
Nikos's user avatar
  • 1,167
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-...
telegott's user avatar
  • 285
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 ...
DaveS's user avatar
  • 61
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&...
winnewoerp's user avatar
  • 1,601
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 ...
Usha's user avatar
  • 147
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 ...
jpmaniac87's user avatar
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 ...
Ethan's user avatar
  • 51
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/...
user33045's user avatar
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 ...
AhmedTech's user avatar
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 ...
Kuljeet Keshav's user avatar
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 ...
Elena Wimmerwuchs's user avatar
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 ...
tenfishsticks's user avatar
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 ...
knutella's user avatar
  • 537
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 ...
N_LLC's user avatar
  • 635
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 ...
flyhigher's user avatar
  • 163
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 ...
Robin H's user avatar
  • 21
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 ...
Richard's user avatar
  • 1,831
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 ...
Cipanul's user avatar
  • 19
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 ...
karoorobin's user avatar
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 ...
SnowMotivation's user avatar
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 ...
Hartje's user avatar
  • 153
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 ...
duarte's user avatar
  • 11
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 ...
RutgerH's user avatar
  • 3,355
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 ...
Topow's user avatar
  • 361
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 ...
hmnoidk's user avatar
  • 717
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 ...
Simon_L's user avatar
  • 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, ...
user2902502's user avatar
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 ...
Tim Autin's user avatar
  • 604
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 ...
tim rowe's user avatar
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 ...
Leprechault's user avatar
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 ...
etna_2605's user avatar
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&...
Thierry's user avatar
  • 149
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 ...
Tobias's user avatar
  • 111
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 ...
senek's user avatar
  • 65
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 ...
N_LLC's user avatar
  • 635
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....
Suesy's user avatar
  • 1
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 ...
Camilo De Los Rios's user avatar
-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 ...
tds's user avatar
  • 91