[GRASSLIST:5777] GRASS Novice Needs Help

[John Ronan]

Morning,


I recently came across Grass when I posted on another list asking the 
question on how to convert scanned images into georeferenced images 
that could be used in xastir (www.xastir.org). So in fact Im not quite 
knowledgeable enough to call myself a novice even.

Thus far I've managed to convert the tiffs to unprojected lat/long 
rasters that xastir (www.xastir.org) can use and in fairness they seem 
to be pretty accurate.  This was only possible by the extra-ordinary 
patience of Gerry Creager and Tom Russo. Who pretty much walked me 
through it step by step, thanks guys.

Anyways my problem now is trying to get rid of the 'fluff' that gets 
created around the edges by gdalwarp when it does the 'warping'. I've 
been attempting to use r.patch followed by r.proj to reproject the 
patched raster into another lat/long database but I've thus far not 
been successful.

I'm currently getting the error 'Input map is outside current region',  
here are the regions,


Firstly the Irish Grid.
projection: 99 (Transverse Mercator)
zone:       0
datum:      ire65
ellipsoid:  modif_airy
north:      52.3
south:      52.15
west:       -7.4
east:       -6.85
nsres:      0.15
ewres:      0.55
rows:       1
cols:       1

The Lat/Long region (bigger than the one above I think)
g.region -p
projection: 3 (Latitude-Longitude)
zone:       0
datum:      wgs84
ellipsoid:  wgs84
north:      54N
south:      52N
west:       9W
east:       5W
nsres:      0:00:00.187198
ewres:      0:00:00.1872
rows:       38462
cols:       76923

So I've done a r.patch of two 'tiles' in the Irish Grid Database called 
ubermap. I exit grass, open it in the 'latlong' location and try to do 
r.proj

r.proj input=ubermap location=Ireland mapset=osmaps output=waterford1 
method=nearest

Input Projection Parameters: +proj=tmerc +lat_0=53.5000000000 
+lon_0=-8.0000000000 +k_0=1.0000350000 +x_0=200000.0000000000 
+y_0=250000.0000000000 +a=6377340.189 +rf=299.3249646 +no_defs 
+towgs84=482.530,-130.596,564.557,-1.042,-0.214,-0.631,8.15
Input Unit Factor: 1

Output Projection Parameters: +proj=latlong +a=6378137 
+rf=298.257223563 +no_defs +towgs84=0.000,0.000,0.000
Output Unit Factor: 1
ERROR: Input map is outside current region

And I'm stuck... as I've really got no idea what I'm doing here any 
help would be appreciated.

Regards
de John
EI7IG