[GRASS-user] Problem with TRMM data and r.in.bin

[Glynn Clements]

Diana Brito wrote:

> I'm trying to import the 3b42rt TRMM product by using r.in.bin.
> 
> I've used the follow lines,
> 
> r.inr.in.bin --o  -f -h input=2001-1-1.bin output=2001-1-1 north=-16
> south=-57 east=50 west=76 cols=104 rows=197
> 
> but, always i got the follow error message:
> 
> ADVERTENCIA: File Size 519968 ... Total Bytes 81952

r.in.bin reads raw binary input. E.g. the above command expects the
file to contain 197*104*4 = 81952 bytes (197 rows by 104 columns by 4
bytes per value).

According to this:

http://www.eol.ucar.edu/projects/name/documentation/3B42RT_README

The original 3B42RT data consists of a 2880-byte header followed by 3
arrays of 480 rows by 1440 columns, the first two being 2 bytes per
value (for a total of 480*1440*2 = 1382400 bytes each) and the third
being 1 byte per value (for a total of 480*1440 = 691200 bytes).

But given the URL you're using:

> url = "....prod_id=3B42RT_daily&action=ASCII+Output"

I wouldn't be surprised if the data is being converted to ASCII, in
which case r.in.bin would be entirely the wrong tool to import it.

-- 
Glynn Clements <glynn at gclements.plus.com>