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How to mask data over ocean

    I am using ferret to plot say rainfall from climate models and
frequently need to mask out data over ocean. I am using go focean 5 white
which uses etopo5 data file to mask out points laying <=0 m, however
for some strange reason this dataset has values <0m over some parts of
Arnhemland (top of plot) and also Lake Eyre comes as a large white patch.

Can anybody suggest some nifty solution to get high resolution 
land/sea mask which I can use to mask out ocean points in ferret??   



Jozef Syktus -- Senior Research Scientist                     
Experimental Seasonal Climate Prediction Modelling Project    
Queensland Centre for Climate Applications
Climate Impacts and Natural Resource Systems
Natural Resource Sciences
Queensland Department of Natural Resources

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| also jis@dar.csiro.au at CSIRO Atmospheric Research          I 

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