[GRASS-user] Projection errors

[Paul Shapley]

Hi Users,

I'm having the problem of projecting a source map (landsat 8 image) into a
target location (Ordnance Survey UK) in Grass 7.

I have tried the r.pack/unpack method but i get the following error:-

'WARNING: Projection information does not match. Proceeding...'

The resulting view shows both images but the landsat image is many
kilometres to the north of where it should overlap.
Have also made 'PROJ2'(see below) with the same n,s,e,w as 'PROJ1'(see
below) but still the same result as above.

As i understand it the underlying Landsat images are in the WGS84/lon-lat
format.
I'm wondering should i use m.proj to first convert the co-ordinates to
OrdSurvey?

I seem to recall just using 'r.proj' in the past with no problems at all
but now i get error:-

'WARNING: pj_transform() failed: latitude or longitude exceeded limits'

I'm a little confused as to which module to use to get around this problem.

g.region
-b
north latitude:   89:59:47.524206N
south latitude:   49:45:56.915978N
west longitude:   18:03:37.69897W
east longitude:   0:02:23.60354W
center longitude: 9:03:00.651255W
center latitude:  69:52:52.220092N

'PROJ1' - DEFAULT_WIND

proj:       99
zone:       0
north:      5848507.5
south:      5605492.5
east:       540907.5
west:       300892.5
cols:       540915
rows:       5848815
e-w resol:  1
n-s resol:  1
top:        1.000000000000000
bottom:     0.000000000000000
cols3:      1
rows3:      1
depths:     1
e-w resol3: 1
n-s resol3: 1
t-b resol:  1

'PROJ2' - DEFAULT_WIND

proj:       99
zone:       0
north:      1230000
south:      -123
east:       660000
west:       -66
cols:       108220
rows:       1169781
e-w resol:  5
n-s resol:  5
top:        1.000000000000000
bottom:     0.000000000000000
cols3:      10000
rows3:      10000
depths:     1
e-w resol3: 5
n-s resol3: 5
t-b resol:  1

Thanks,

-- 
*Paul J. Shapley*
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