[GRASS5] Re: [GRASSLIST:1775] r.in.bin

[Bob Covill]

Glynn Clements wrote:
> 
> Yan Fitterer wrote:
> 
> > First, congratulations for a briliant program.
> >
> > My problem (is it a bug?):
> > I'm getting a gtopo30 file from:
> > http://edcdaac.usgs.gov/gtopo30/w020n90.html
> >
> > The I try to import the .DEM file into Grass with r.in.bin
> >
> > I get all OK (byte swap, signed integer, etc...) except that at a level of
> > about 110 (going up a hill for ex.), the z (altitude) values suddently go to
> > -120, and then increase in line with the terrain.
> >
> > Has anybody seen that behaviour?
> >
> > I'm running 5.0 beta 11 on Linux RH 7.0 (2.2.16 kernel)
> 

Hello,

I finaly got around to downloading and importing the DEM from the above
link. I have been able to import the data successfully into both a Lat
Long and XY database using the following command:

r.in.bin input=W020N90.DEM output=W020N90.DEM north=90 south=40 east=20
west=-20 r=6000 c=4800 anull=-9999 bytes=2

I imported it on both a SUN and Linux with byteswapping set accordingly.
The minmax reported from r.describe is the correct -30 to 4536. You may
have been getting incorrect results with the -s flag which I believe was
intended for data with a range of -127 to 127. I have never actually
seen any data that requires this flag??

I imported it with the changes made to r.in.bin as discovered by Jan
earlier. 

These changes are from line 211 in main.c

..
        if (! G_scan_easting (parm.east->answer,  &cellhd.east, 
cellhd.proj)) return 1;
        if (! G_scan_easting (parm.west->answer,  &cellhd.west, 
cellhd.proj)) return 1;
insert >>>       if (sscanf(parm.rows->answer,"%d%1s",&cellhd.rows,
dummy) != 1) return 1;
insert>>>       if (sscanf(parm.cols->answer,"%d%1s",&cellhd.cols,
dummy) != 1) return 1;
        }
        if (no_dim == 0 && no_coord == 1) { /* Get rows and cols only */
        if (sscanf(parm.rows->answer,"%d%1s",&cellhd.rows, dummy) != 1
        || cellhd.rows <= 0) return 1;
..

Hopefully this helps.

-- 
Bob Covill

Tekmap Consulting
P.O. Box 2016 Fall River, N.S.
B2T 1K6
Canada

E-Mail: bcovill at tekmap.ns.ca
Phone: 902-860-1496
Fax: 902-860-1498

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