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PolyGeo ♦
PolyGeo ♦
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QGIS downsample Downsampling then upsampleupsampling raster using QGIS?

I'm trying to downsample a raster then upsample it again.

I am using the gdalwarp function in QGIS.

When downsampling the raster looks OK in the front end, I set the cell size to 10x the original raster.

When upsampling back to the original cell size using the downsampled raster the original data seems to be preserved and I end up back at the original raster. What I'm expecting to happen is that I see blocks of 10x10 cells all with the same value (same as the downsampled raster).

Does QGIS preserve the original cell values? 

Is there a way to perform this operation?

Thanks

QGIS downsample then upsample raster

I'm trying to downsample a raster then upsample it again.

I am using the gdalwarp function in QGIS.

When downsampling the raster looks OK in the front end, I set the cell size to 10x the original raster.

When upsampling back to the original cell size using the downsampled raster the original data seems to be preserved and I end up back at the original raster. What I'm expecting to happen is that I see blocks of 10x10 cells all with the same value (same as the downsampled raster).

Does QGIS preserve the original cell values? Is there a way to perform this operation?

Thanks

Downsampling then upsampling raster using QGIS?

I'm trying to downsample a raster then upsample it again.

I am using the gdalwarp function in QGIS.

When downsampling the raster looks OK in the front end, I set the cell size to 10x the original raster.

When upsampling back to the original cell size using the downsampled raster the original data seems to be preserved and I end up back at the original raster. What I'm expecting to happen is that I see blocks of 10x10 cells all with the same value (same as the downsampled raster).

Does QGIS preserve the original cell values? 

Is there a way to perform this operation?

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Richard Todd
Richard Todd
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QGIS downsample then upsample raster

I'm trying to downsample a raster then upsample it again.

I am using the gdalwarp function in QGIS.

When downsampling the raster looks OK in the front end, I set the cell size to 10x the original raster.

When upsampling back to the original cell size using the downsampled raster the original data seems to be preserved and I end up back at the original raster. What I'm expecting to happen is that I see blocks of 10x10 cells all with the same value (same as the downsampled raster).

Does QGIS preserve the original cell values? Is there a way to perform this operation?

Thanks