stack 10 modis ndvi geotiffs and scale them by 0.0001

Question

I have 10 geotiffs Modis ndvi named 2005.tif ... 2014.tif I want to stack them all and create timeseries. i know how to do that, but the stacked images still need scaling by 0.0001. how can i bulk scale them using gdal -scale function before stacking them?

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Tried the first line on OSGeo, but when openning the new tifs all I can see is 0s and 1s. any idea?

Answer 1

In Windows (run OSGeo4W shell):

Scaling:

for %i in (*.tif) DO gdal_translate -scale -2000 10000 -0.2 1 %i outputs\%i

You might find recalculating instead better:

for %i in (*.tif) DO gdal_calc.bat -A %i --outfile=outputs\%i --calc="A*0.0001" --NoDataValue=0

In Ubuntu looping through files is slightly different:

for i in *.tif; do
    gdal_calc -A $i ...
done