I would like to create a grid file from the corresponding DTM / DSM tiles with the height difference stored in the cells. DSM 1 km tiles are supplied in 2 metre resolution (500 by 500) while the DTM 1 km tiles are provided in only 5 metre resolution (200 by 200).
To get the grids to have the same number of rows and columns (so the height difference can be generate in the RasterCellValueCalculator), I first tried to use the Raster Resampler with the number of rows and columns set to 1000. However the interpolation methods produce unreliable results. Is there a transformer that will split the 2m / 5m cells into groups of 1 metre cells while keeping the same value?
Also what is the best way of pairing the files so that a workbench can iterate through DTM / DSM tiles with matching file name in the source folders? For example processing DTM\\SO4043.jpg and DSM\\SO4043.jpg together and then all the other matching pairs?
Each output would be fme_basename.tif
Note I was planning to use the output to add the height to vegetation areas derived from colour infrared images. (Used RasterExpressionEvaluator to calculated the NDVI for the colour infrared image).