Resampling a single GeoTiff image in QGIS

QGIS comes bundled with GDAL tools which you can use to resample one or more raster images, though the QGIS menu labels may be a little unclear.

To resample an geo image in QGIS, do the following:

1. Start QGIS. Optional. Load in a geo image file to resample.
   
   
   
   
2. Select Raster | Projections | Warp (Reproject).
   
   The Warp (Reproject) dialog box appears.
   
   
3. In the Input file field, click Select. Browse and select the source file, e.g. UTM2GTIF.tif.
4. In the Output file field, click Select. Type in the destination file e.g. ResampleUTM2GTIF.tif.
5. Toggle on Resize.
6. In the Width field, type in the destination width in pixels e.g. 100.
7. In the Height field, type in the destination height in pixels e.g. 133.
   
   
   
8. Click OK.
   
   The source file is resampled.