On Fri, 12 Mar 2010, Markus Neteler wrote:
On Fri, Mar 12, 2010 at 8:38 PM, Martin Landa <[email protected]> wrote:
Hi,
2010/3/12 Massimo Di Stefano <[email protected]>:
"location wizard -> select epsg code -> search for : 3004"
in the paste release (build less than 1 month ago) after select the
epsg:code(3004)
grass prompt me to the window :
http://img534.imageshack.us/img534/8254/schermata20100312a09564.png
to select the +towgs parameters
with the latest svn version this window doesn't appair and the locaqtion is
created using the defaults parameters :
...
it seems to be bug in g.proj -
g.proj epsg=3004 datum=-1
no output is printed...
When you add -t, it works:
g.proj epsg=3004 datum=-1 -t
The fact that the -t flag needs to be specified, suggests that somehow
when g.proj is querying GDAL for a projection description for EPSG code
3004, it is coming back fully specified, i.e. with complete towgs84
parameters, and thus g.proj thinks the datum information is already all
specified and correct, so it doesn't even offer the option of modifying it
unless the user requests to override the datum information in the input
co-ordinate system with the -t flag. (I'm sure there is a logical reason
for working like that although it doesn't immediately come to mind at the
minute!)
I'm not very sure what's going on though. I will look into it, although it
might be 2-3 days before I have an answer.
Paul
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