[Gvsig_english] Projecting EPSG 27700 British National Grid to overlay EPSG 4326 (WGS 1984)

[Rahkonen Jukka]

Hi,

It cannot be EPSG:4324 and the first place to see it is in "UNIT["metre"
EPSG:4326 is using naturally degrees. Have a try with EPSG:3395

http://spatialreference.org/ref/epsg/3395/

-Jukka Rahkonen-

> -----Alkuperäinen viesti-----
> Lähettäjä: gvsig_internacional-bounces at listserv.gva.es 
> [mailto:gvsig_internacional-bounces at listserv.gva.es] Puolesta liam391
> Lähetetty: 25. maaliskuuta 2011 12:51
> Vastaanottaja: gvsig_internacional at listserv.gva.es
> Aihe: Re: [Gvsig_english] Projecting EPSG 27700 British 
> National Grid to overlay EPSG 4326 (WGS 1984)
> 
> Hi Mario,
> 
> Hi Mario,
> 
> I created the view in WGS84, and added the raster. I then 
> added the shp
> using EPSG 27700, and said yes to the "do you want to 
> re-project" pop-up.
> However, the imported shp still does not overly the raster. I 
> think it is a
> problem with the raster, as the latitude/long. values make 
> sense for the
> reprojected shp, but not fro the raster.
> 
> I don't know if the projection info., from "raster 
> properties" would help:
> 
> Projection
>   PROJCS["Mercator",     GEOGCS["WGS 84",       DATUM["WGS_1984",
>         SPHEROID["WGS 84",6378137,298.2572235630016,
>           AUTHORITY["EPSG","7030"]],         
AUTHORITY["EPSG","6326"]],
>       PRIMEM["Greenwich",0],       UNIT["degree",0.0174532925199433],
>       AUTHORITY["EPSG","4326"]],     PROJECTION["Mercator_1SP"],
>     PARAMETER["central_meridian",0],     PARAMETER["scale_factor",1],
>     PARAMETER["false_easting",0],     PARAMETER["false_northing",0],
>     UNIT["metre",1,       AUTHORITY["EPSG","9001"]]],
> 
> Re the error - If I create the view in EPSG 27700, then add 
> the raster and
> try to reproject, GvSig crashes. I could not find the file in the bin
> folder, but I did a print screen of the error msg which pops up:
> http://osgeo-org.1803224.n2.nabble.com/file/n6207258/GVsigerro
rmsg.png 
> 
> Thankyou
> Liam
> 
> 
> 
> Hi Liam,
> 
> reprojecting on the fly must work correctly. You can create a view in 
> EPSG 4326 (geographic coords, WGS84), and load the raster 
> file. Then you 
> load the shp file selecting EPSG 27700 for its current system, and it 
> will notice you that it will be reprojected on the fly. After loading 
> the layer, if you go to the Layer->Export to->SHP menu, 
> you will have 
> the shp file in 4326. Do you say that it doesn't work?
> 
> About the raster reprojecting, if gvSIG crashes, there's a file whose 
> name starts by "hs_err....." in the "bin" 
> folder of your
> gvSIG 
> installation folder. The date will be the same than the crash time. 
> Could you attach it to check what could happen?
> 
> Best regards,
>    Mario
> 
> 
> 
> liam391 escribió:
> > Hello,
> >
> > I am a novice student user of GvSig having used it for 
> basic mapping
> and
> > geoprocessing for about a year.
> >
> > I have Raster files in WGS 1984 coordinate system (from 
> Seazone) and I
> wish
> > to overlay them with shapefiles in EPSG 27700 British 
> National Grid
> (these
> > are from SNH natural spaces and are available free
> >
> http://gateway.snh.gov.uk/pls/htmldb_ddtdb1/f?p=101:1:71723021
34011178865).
> >
> > I have tried to use the reproject tool on the shapefiles 
> but so far I
> have
> > found that either no transformation is available, or 
> GvSig has crashed
> when
> > I have tried to perform one. Projecting on the fly does 
> not seem to
> work;
> > attempting to reproject the raster to match the view 
> projection causes
> a
> > crash and error message. I am running GvSig 1.10 on 
> windows 64 bit.
> >
> > I apologise for the basic question, but haven't found a 
> solution that
> I've
> > understood when looking through the forums,
> >
> > Thanks
> >
> > Liam
> >
> &
> 
> 
> --
> View this message in context: 
> http://osgeo-org.1803224.n2.nabble.com/Projecting-EPSG-27700-B
ritish-National-Grid-to-overlay-EPSG-4326-WGS-1984-> tp6204644p6207258.html
> Sent from the gvSIG users mailing list archive at Nabble.com.
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