[GRASS-user] Using r.mapcalc to transform '*' values to a float

[Thomas Adams]

List:

I have a GRASS location that spans the entire U.S. I plan on 
re-projecting raster maps into the location from a GRASS location with a 
much smaller domain. When I do this, the values outside of the projected 
map region have a value '*' when I query the new raster outside of my 
area of interest using the GRASS GUI. What I need to do, ultimately, is 
to use r.out.ascii to write out an ascii grid that covers the full U.S. 
region regardless of the extent of the actual data. However, before I do 
this I want to use r.mapcalc to convert the '*' values (are they 
'null'?) to 9.999e+20, which is a the missing value for the software 
that needs to ingest the ascii file output from GRASS. How do I treat 
the '*' values in r.mapcalc?

Thanks,
Tom

-- 
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL:	thomas.adams at noaa.gov

VOICE:	937-383-0528
FAX:	937-383-0033