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metno / esd

An R-package designed for climate and weather data analysis, empirical-statistical downscaling, and visualisation.
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retrieve.ncdf4 #187

Closed brasmus closed 8 years ago

brasmus commented 8 years ago

one of the examples is while trying to execute the retrieve.ncdf4 function, I come up with this error message "'retrieve.ncdf4' is not suited to extract longitude units different from 'degrees_east'", what does this mean? and how can I solve this problem? Does this mean the .nc file I have is not projected or it does not have the correct format? Also I have questions regarding the eofs. How does this package select eofs for different areas, or do we need to predefine the eofs for our interest area? I will be grateful to you if you can spare some of your time to explain this error and help me in downscaling cordex data. I look forward to hearing from you as soon as possible.

abdelkaderm commented 8 years ago

Dears, retrieve.ncdf4 function is not appropriate for RCM data like EURO-CORDEX, especially, when the grid is rotated. This is why you get an error message. retrieve.ncdf4 handle only regular girds. You would better use 'retrieve.rcm' function which will consider each grid cell separately and store the irregular grid as station objects. This works as long as you select a small domain. For large domains, you may face some memory issues. Then do a PCA on stations to convert it to field, etc... In R type ? retrieve to access the documentation. It is explained there :+1: