I want to calculate potential evapotranspiration (PET) using HG method where the meteorology input is derived from the RegCM4 model. However, there is a problem for finding a long-term of observation for PET, so can I use CRU-PET as a source for model evaluation at point-scale or not?
Actually CRU Time series is a grid best data set. You May use a pixel for a long term PET analysis but you have to validate with nearest station or ground based available PET observation data.
Yes you are right, unfortunately I don't have a good records for ground based stations. That is why I asked about using CRU-PET instead of ground station for model evaluation
Ok, I didn't know what is the availability of your ground base data. Suppose you want to modeled for 50 year but ground base data is available only last 5 year, in that I suggest to use CRU PET pixel data for modelling input and draw a regression between ground date (available 5 year) and Pixel data.
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