[GRASSLIST:3066] Re: Merging 4 rasters 1 bit tiffs.

[Emile Snyder]

I am pretty new, so this might not be the best way to do it, but I recently
figured out a method that worked for me.  I also had 4 tiffs (USGS topo maps
of 4 adjacent regions.)  If the maps go right up to the edges of the images,
I think all you should have to do is 

r.patch input=map1,map2,map3,map4 output=fullmap

The tiff images I was using had whitespace in them though, and so I used
r.in.poly on text files I wrote specifying the whitespace areas for the
different maps, then used various combinations of r.mask and r.patch to
successively build up various intermediate raster maps until I had one with
all four maps on one layer without their intervening white regions mucking
things up.

luck,
-emile

On Fri, Feb 01, 2002 at 05:17:32PM +0000, Antonio wrote:
> Hi..
> 
> I have a region that is made up by 4 diffrent raster files. I imported them in with r.in.tiff as they were originaly tiff file (1 bit per cell, I mean only 2 categories on the file 0 or 1)
> The tiff files are maps that have contour lines of the region (scale 1:5000)..
> THe problem is that I can only manage to view one file per time. I would like to merge them but don't know where to start..
> Would be glad to recieve suggestions..
> 
> Thankyou..
> -- 
>                  Antonio Gennarini
>                 Crecchio, CH - ITALY
> 	-----------------------------------
> Earth Science student at University "G. D'Annunzio"..
>      Join th GNU generation, start from LINUX..
> 
> 
> 
>