How to downsample resolution of raster data

Did you have a look at the RasterResampler: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Transformers/Transformers/rasterresampler.htm

Hi @limo​ ,

I believe the RasterResampler transformer can be used for exactly this usecase;

"Resamples rasters, based on specified output dimensions, cell size in ground units, or percentage of original, by interpolating new cell values."

See also its documentation page for more info and a visual illustration of how the transformer works.

I thought only number of columns and rows are possible.

So you are right I can set cell size x and y. Are the values in meter?

So if I have an orthophoto with 8cm ground resolution and I set 0.2 for x and y value then I get the orthophoto with 20cm ground resolution. This is exactly what we need.

Thanks :)

As mentioned in the documentation, the values are in ground units. Meaning that if the coordinate system of your raster is in meters, then the values are also interpreted as meters. However, if your raster coordinate system is in e.g. Lat/Long, then the values will be interpreted as being in decimal degrees.

ok I understand ... thanks @david_r​