[Gvsig_english] Gvsig_internacional Digest, Vol 47, Issue 12
Juan Lucas Dominguez Rubio
jldominguez at prodevelop.es
Mon Dec 14 10:25:28 CET 2009
Hello,
I have tested transformation 1780 in gvSIG 1.9 and it works very much as in your screenshot. Video here:
http://www.youtube.com/watch?v=uO77sGgakE0
I get these errors:
0.23 m (near the Baltic Sea)
0.52 m
0.26 m
0.99 m
1.78 m
5.58 m (near Switzerland)
This was done on Windows XP.
Regards,
Juan Lucas Domínguez Rubio
---
Prodevelop SL, Valencia (España)
Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
http://www.prodevelop.es <http://www.prodevelop.es/>
---
________________________________
De: gvsig_internacional-bounces at listserv.gva.es en nombre de Juan Lucas Dominguez Rubio
Enviado el: dom 13/12/2009 17:07
Para: Users and Developers mailing list; gvsig_internacional at listserv.gva.es
Asunto: Re: [Gvsig_english] Gvsig_internacional Digest, Vol 47, Issue 12
Hello, Heinz. Thanks for the screenshot, it's very illustrative.
I have found this little table showing the coordinates of a certain 'Trigonometrischer Punkt':
http://www.geocaching.com/seek/cache_details.aspx?guid=86b14112-20d3-4950-8364-86f983f0484d
I have applied the GSB grid to that and the coordinates I obtained in EPSG:25832 are only 3 cm (0.03 m) away from the coordinates seen in that table, which is a reasonable error. Anybody knows if there is somewhere a larger table showing more official 'Trigonometrischer Punkt' like that one?
Tomorrow I'll test the 1780 transformation with gvSIG 1.9 and tell you what happens.
Regards,
Juan Lucas Domínguez Rubio
---
Prodevelop SL, Valencia (España)
Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
http://www.prodevelop.es <http://www.prodevelop.es/>
---
________________________________
> De: gvsig_internacional-bounces at listserv.gva.es en nombre de Heinz Mundhenk
> Enviado el: sáb 12/12/2009 19:36
> Para: gvsig_internacional at listserv.gva.es
> Asunto: Re: [Gvsig_english] Gvsig_internacional Digest, Vol 47, Issue 12
>
> Hello Juan Lucas Dominquez,
>
> i think the coordinates in the BETA2007testdata.csv are
> first class and basicly used for the grid-calculation BETA2007.gsb.
>
> I have tried the transformation 1780 in gvSIG 1.9 again, but
> with the same bad results ... but nobody is perfect.
>
> For a manual transformation from GK3 EPSG:31467 to ETRS89/UTM32N
> EPSG:25832 i have found some parametersets here
>
> www.crs-geo.eu -> CRS Description -> national CRS
>
> Using the same testdata and the parameterset for the n o r t h
> of former Westgermany the errors are less 1 m. So a seven-
> parameter-transformation with change of the geo-datum in gvSIG 1.9
> in general seems to work. For more details of the last test see the attachment.
>
> By the way, what about a tool for transforming lots of shapes/rasters
> in a batch-mode in future gvSIG-versions (like the batch-project tool in ArcGIS) ? In this context a file with testdata (included in the batch stuff) is very usefull to verify the handling of the transformation.
>
> Greetings
>
> Heinz
-------- Original-Nachricht --------
> Datum: Sat, 12 Dec 2009 12:00:10 +0100
> Von: gvsig_internacional-request at listserv.gva.es
> An: gvsig_internacional at listserv.gva.es
> Betreff: Gvsig_internacional Digest, Vol 47, Issue 12
> Send Gvsig_internacional mailing list submissions to
> gvsig_internacional at listserv.gva.es
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
> or, via email, send a message with subject or body 'help' to
> gvsig_internacional-request at listserv.gva.es
>
> You can reach the person managing the list at
> gvsig_internacional-owner at listserv.gva.es
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Gvsig_internacional digest..."
>
>
> Today's Topics:
>
> 1. Re: No problems reprojecting from GK to UTM usingBETA2007
> (Juan Lucas Dominguez Rubio)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 11 Dec 2009 22:47:14 +0100
> From: "Juan Lucas Dominguez Rubio" <jldominguez at prodevelop.es>
> Subject: Re: [Gvsig_english] No problems reprojecting from GK to UTM
> usingBETA2007
> To: "Users and Developers mailing list"
> <gvsig_internacional at listserv.gva.es>,
> <gvsig_internacional at listserv.gva.es>
> Message-ID:
> <E43C32BC5843E34FB4C00CDFAAAAF7D8017B4DB9 at australia.prodevelop.local>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello, Heinz:
>
> I have done the test you describe and indeed the points in the CSV file
> are not a subset of the GSB grid, but the error is almost zero. If we are
> honest, we'll have to look for an explanation, no? Here is my guess: the CSV
> file was created using the GSB grid. I misunderstood the goal of that
> verification file (perhaps the Australian file too?). They are not used to check
> if the grid works fine. They are used to check that your GIS software knows
> how to deal with the grid. This is my second hypothesis :-)
>
> As for the transformation with code 1780 available in gvSIG, I have used
> it and get the expected errors (< 5m):
>
> 3.43 m
> 2.85 m
> 0.15 m
> etc.
>
> Perhaps you have not chosen the right options? I have used gvSIG 1.1.2
> because I am on Windows Vista.
>
>
> Regards,
>
> Juan Lucas Dom?nguez Rubio
> ---
> Prodevelop SL, Valencia (Espa?a)
> Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
> http://www.prodevelop.es <http://www.prodevelop.es/> <http://www.prodevelop.es/>
> ---
>
> ________________________________
>
> > De: gvsig_internacional-bounces at listserv.gva.es en nombre de Heinz
> Mundhenk
> > Enviado el: jue 10/12/2009 18:07
> > Para: gvsig_internacional at listserv.gva.es
> > Asunto: Re: [Gvsig_english] No problems reprojecting from GK to UTM
> usingBETA2007
> >
>
>
> > Dear list,
> >
> > here is another working grid-based reprojektion for Germany.
> >
> > Reprojecting from GK to ETRS89/UTM using grid BETA2007
> >
> > In the next years coordinates from different old SRS in
> > Germany will change to the new projection ETRS89/UTM
> > with EPSG:25832 (Westgermany) and 25833 (Eastgermany).
> >
> > Most old SRS in former Westgermany are based on the Gauss-Krueger-
> > Projektion (GK, EPSG:31466, 31467 and 31468).
> >
> > The transition from GK to UTM can be done with the integrated
> > "transformation on the fly" in gvSIG for errors lower than 5 meters.
> >
> > If you use the grid "BETA2007.gsb", the error is lower than 1 meter.
> >
> > Here you can get the grid and coordinates for a tests :
> >
> > www.crs-geo.eu/BeTA2007
> >
> > files BETA2007.gsb (85 kByte)
> > BETA2007testdaten.csv (12 kByte)
> >
> > On this website you find lots of additional informations.
> >
> > For a test make a dfb-file from the csv-file by selecting all records
> > with Quell-Bezugssystem (source) = DE_DHDN_3GK3
> > and Ziel-Bezugssytem (target) = ETRS89_UTM32.
> >
> > From this dbf-table create the shape (with testpoints)
> > GK3_31467.shp using Quell-X and Quell-Y for X- and Y-coodinates.
> >
> > How to integrate the *.gsb - file in gvSIG 1.9 ?
> >
> > Make a view with SRS-property EPSG:25832 (ETRS89/UTM32) and add the
> > testpoint-shape with the SRS-Property EPSG:31467, using
> grid-transformation
> > (with german-program-surface/skin : NTv2 Format Raster- Datei).
> > In the next window click the button Import and select the
> > previous downloaded grid BETA2007.gsb.
> >
> > Then Export the reprojected shape under the name UTM32_25832.shp and add
> it to
> > the view. Now you can add the fields X and Y and calculate x() and y().
> > Then calculate the difference between Ziel-X and X / Ziel-Y and y.
> > The Errors are lower 0.01 meters ! The testpoints are no grid-points !
> >
> > Observations
> >
> > 1. The reprojektion with the grid does not work in the reverse order
> > from UTM to GK.
> >
> > 2. Reprojection from GK to UTM with gvSIG using the same testpoint-shape
> > and the integrated EPSG-transformations 1780 or 15948 result with
> > errors between 100 and 200 meters ! Why ?
> >
> > Greetings
> >
> > Heinz Mundhenk
> > hmundhenk at gmx.de
> >
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> http://listserv.gva.es/pipermail/gvsig_internacional/attachments/20091211/c70719cb/attachment-0001.htm
>
> ------------------------------
>
> _______________________________________________
> Gvsig_internacional mailing list
> Gvsig_internacional at listserv.gva.es
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
>
>
> End of Gvsig_internacional Digest, Vol 47, Issue 12
> ***************************************************
--
Viele Grüße
Heinz Mundhenk
Tel. 05281 / 163742
e-mail hmundhenk at gmx.de
GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://listserv.gva.es/pipermail/gvsig_internacional/attachments/20091214/b0e9e3ed/attachment.htm
More information about the Gvsig_internacional
mailing list