this bug's URL: http://intevation.de/rt/webrt?serial_num=4160
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Subject: v.in.org location= misses lat_ts and datum settings.
Hi,
I'm trying to create a new location from a shapefile's .prj info via the
'v.in.ogr location=' method as the documentation is unclear to me.
When I do this it misses the datum and the standard lat settings.
Here is what is listed in the docs:
The projection used [...] is:
Mercator Projection
Central Meridian = 100
Standard Parallel = -46
False Easting = 0
False Northing = 0
Spheroid/Datum = Clarke 1866
here is the contents of the .prj file:
PROJCS["Clarke_1866_Mercator",GEOGCS["GCS_Clarke_1866",DATUM["D_Clarke_1866",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",100.0],PARAMETER["Standard_Parallel_1",-46.0],UNIT["Meter",1.0]]
here is what the PROJ_INFO ends up as:
G61-cvs> g.proj -p
-PROJ_INFO-------------------------------------------------
name : Mercator
proj : merc
a : 6378206.4
es : 0.006768657997609644
lat_ts : 0
lon_0 : 100
k : 1.000000
x_0 : 0
y_0 : 0
no_defs : defined
-PROJ_UNITS------------------------------------------------
unit : Meter
units : Meters
meters : 1
lat_ts = 0 ??!
G61-cvs> g.region -p
projection: 99 (Mercator)
zone: 0
datum: ** unknown (default: WGS84) **
ellipsoid: a=6378206.4 es=0.006768657997609644
north: -1899000
south: -5288000
west: 4412000
east: 6974000
nsres: 1000
ewres: 1000
rows: 3389
cols: 2562
Datum is missing, can't blame it as I don't understand how Clark 1866 is the
datum either (as specified in the .prj file).
test data:
http://www.niwascience.co.nz/ncco/mec/mec_example.zip
http://www.niwascience.co.nz/ncco/mec/mec_manual.pdf/view_pdf
?
thanks
Hamish
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