Hi all!
I want to create a new location in GRASS GIS using a file that uses the ITRF
datum 1992 and get the error:
g.proj returned the following informational message:
WARNING: Datum ITRF_1992 not recognised by GRASS and no parameters found
What can I do? anyone can help me?
thank you a lot!
--
View this message in context: http://osgeo-org.1560.n6.nabble.com/datum-itrf-92-not-recognised-tp5002046.html
Sent from the Grass - Users mailing list archive at Nabble.com.
On Sat, Sep 15, 2012 at 7:51 AM, tigrida <adriana.mata@ipicyt.edu.mx> wrote:
Hi all!
I want to create a new location in GRASS GIS using a file that uses the ITRF
datum 1992 and get the error:g.proj returned the following informational message:
WARNING: Datum ITRF_1992 not recognised by GRASS and no parameters foundWhat can I do? anyone can help me?
I have downloaded a test dataset from
http://mapserver.inegi.org.mx/data/mgm/?s=geo&c=1298
--> Polígonos de Localidades Urbanas Geoestadísticas de Zonas
Pendientes por Asignar (7.43 Kb)
which reports
ogrinfo -so LOCALIDADES_URBANAS.shp LOCALIDADES_URBANAS
INFO: Open of `LOCALIDADES_URBANAS.shp'
using driver `ESRI Shapefile' successful.
Layer name: LOCALIDADES_URBANAS
Geometry: Polygon
Feature Count: 7
Extent: (3349667.844974, 487959.061402) - (3928899.605898, 990833.558894)
Layer SRS WKT:
PROJCS["North_America_Lambert_Conformal_Conic",
GEOGCS["ITRF92",
DATUM["ITRF_1992",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Lambert_Conformal_Conic_2SP"],
PARAMETER["False_Easting",2500000.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",-102.0],
PARAMETER["Standard_Parallel_1",17.5],
PARAMETER["Standard_Parallel_2",29.5],
PARAMETER["Latitude_Of_Origin",12.0],
UNIT["Meter",1.0]]
CVE_ENT: String (254.0)
CVE_LOC: String (254.0)
CVE_MUN: String (254.0)
NOM_LOC: String (254.0)
Here I see
http://svn.osgeo.org/gdal/trunk/gdal/data/gdal_datum.csv
-> 1042,Mexican Datum of 1993,geodetic,ITRF1992 at epoch
1988.00.,1993,7019,8901,1160,Geodetic survey.,"Realised by a frame of
15 active GPS stations observed and adjusted in the ITRF1992. Includes
ties to tide gauges. Replaces NAD27 (code 6267).","National
Densifications per http://www.sirgas.org. See also
www.fig.net/pub/cairo/papers/ts_13/ts13_03_hansen.pdf.",OGP,"2010/11/02",2009.087
2010.090,0,
and
https://svn.osgeo.org/gdal/trunk/gdal/data/geoccs.csv
4481,Mexican Datum of 1993,1042,Mexican Datum of
1993,1042,9001,7019,8901,1,0,6500
I found also EPSG code 4481:
http://www.epsg-registry.org/
--> retrieve by code: 4481
--> Mexican Datum of 1993 to WGS 84 (1)
The values are all 0 (so I suspect that towgs84=0,0,0).
I found also this discussion:
http://forums.esri.com/Thread.asp?c=93&f=984&t=273181
The best is to ask this question (feel free to forward what I wrote
here) at the PROJ4
mailing list where many experts read (I'll follow the disussion there, too):
http://lists.maptools.org/mailman/listinfo/proj
Then we may be able to add the missing definition to GRASS GIS.
Markus
On Sat, Sep 15, 2012 at 2:39 PM, Markus Neteler <neteler@osgeo.org> wrote:
On Sat, Sep 15, 2012 at 7:51 AM, tigrida <adriana.mata@ipicyt.edu.mx> wrote:
Hi all!
I want to create a new location in GRASS GIS using a file that uses the ITRF
datum 1992 and get the error:g.proj returned the following informational message:
WARNING: Datum ITRF_1992 not recognised by GRASS and no parameters found
...
For the record, here the answer:
http://lists.maptools.org/pipermail/proj/2012-September/006413.html
On Tue, Sep 18, 2012 at 11:00 PM, Clifford J Mugnier <cjmce@lsu.edu> wrote:
Unless you are concerned at the centimeter level of precision, I would
equate ITRF92 as being identical with WGS84.Clifford J. Mugnier, c.p., c.m.s.
Chief of Geodesy
LSU Center for GeoInformatics (ERAD 266)
Dept. of Civil Engineering (P.F. Taylor 3531)
LOUISIANA STATE UNIVERSITY
...
From: proj-bounces@lists.maptools.org
Hence I have updated GRASS 6.4 to 7 accordingly in r53227 - r53229.
My test data set:
http://mapserver.inegi.org.mx/data/mgm/?s=geo&c=1298
--> Polígonos de Localidades Urbanas Geoestadísticas de Zonas
Pendientes por Asignar (7.43 Kb)
imports (I believe) properly now:
GRASS 6.4.3svn (newLocation5):/tmp > g.proj -w
PROJCS["Lambert Conformal Conic",
GEOGCS["grs80",
DATUM["ITRF92",
SPHEROID["Geodetic_Reference_System_1980",6378137,298.257222101]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]],
PROJECTION["Lambert_Conformal_Conic_2SP"],
PARAMETER["standard_parallel_1",17.5],
PARAMETER["standard_parallel_2",29.5],
PARAMETER["latitude_of_origin",12],
PARAMETER["central_meridian",-102],
PARAMETER["false_easting",2500000],
PARAMETER["false_northing",0],
UNIT["Meter",1]]
Please try from SVN or tomorrow's snapshot and report any inconsistencies
(or success :). The test is to reproject to a different projection and check the
precision.
Markus