[Gvsig_english] About gvSIG - Unsuported CRS
Sergio Clark
sergio.clark at iver.es
Mon Oct 22 08:39:44 CEST 2007
Hi Carol,
EPSG are the acronym of European Petroleum Survey Group, which is a
group created in 1986. Nowadays, it's called Surveying and Positioning
Committee, and comprises specialists working in areas of surveying,
geodesy, cartography...
Every pair formed by Reference System+Coordinates System is codificated
by a number (for example: ED50+UTM huso 30 is EPSG: 23030). In your
case, 29184 is the EPSG code for SAD69+UTM huso24.
Greetings!
Sergio.
--
Sergio Clark
Equipo gvSIG
IVER T.I., S.A.
www.iver.es
www.gvsig.com
Carol escribió:
> Javier and Diego,
>
> I installed the gvSIG version 1.1 in my computer.
> I got to solve the problem about the projection system: how did you
> say, I had to create a new view first, change the projection system to
> the system that my layers are and after this add the layers.
> My Reference System is in EPSG 29184: SAD69, coordinates UTM, fuso 24.
> It´s ok now!
> I would like to know what means EPSG??? Why don´t appear SAD69 in my
> view instead EPSG???
>
> Carol.
>
>
>
>
>
> 2007/10/19, Javier Carrasco <jcarrasco at prodevelop.es
> <mailto:jcarrasco at prodevelop.es>>:
>
> Hi Diego,
> You are right, Carol don't need to make a datum transformation
> because both CRSs use the same datum so it's not useful to select
> a manual transformation. I was wrong.
> The problem is that we can't select the correct CRS of the layer
> beacase gvSIG say "CRS not supported" and "Finalize" button is
> disabled, so the coordinates conversion is not being done.
>
> Javi.
>
>
> -----Mensaje original-----
> De: gvsig_internacional-bounces at runas.cap.gva.es
> <mailto:gvsig_internacional-bounces at runas.cap.gva.es> en nombre de
> Diego Guerrero Sevilla
> Enviado el: vie 19/10/2007 11:14
> Para: Users and Developers mailing list
> Asunto: Re: [Gvsig_english] About gvSIG - Unsuported CRS
>
> Hi.
>
> In this case it's not necesary to perform a transformation (only a
> conversion
> operation is performed automatly) because the view CRS and the
> layer CRS have
> the same Datum (29118,29195,29100,29101 are proyected CRS based on
> 4291). You
> only need to select CRS for the view before adding the layers,
> and to select
> the layer CRS when adding it.
>
> Bests. Diego.
>
> On Friday 19 October 2007 08:36:12 Javier Carrasco wrote:
> > Not exactly.
> > When you select one CRS for your view and then add a layer in
> another CRS,
> > gvSIG reprojects the layer to the view CRS. The problem is that
> at this
> > moment transformations are not defined for the projected Brazil
> CRSs and
> > you have to know the transformation parameters to make a manual
> > transformation.
> >
> > Javi.
> >
> > -----Mensaje original-----
> > De: gvsig_internacional-bounces at runas.cap.gva.es
> <mailto:gvsig_internacional-bounces at runas.cap.gva.es> en nombre de
> Carol
> > Enviado el: jue 18/10/2007 20:01
> > Para: Users and Developers mailing list
> > Asunto: Re: [Gvsig_english] About gvSIG - Unsuported CRS
> >
> > Ok, I understood.
> > So, the gvSIG don´t allow that the user CHANGE the projection
> system,
> > neither realize a transformation of coordinates, right?
> > At least, not now, ok?
> >
> > Thanks.
> >
> > 2007/10/18, Javier Carrasco <jcarrasco at prodevelop.es
> <mailto:jcarrasco at prodevelop.es>>:
> > > Your shapefiles are not in EPSG 4291 (SAD69 in Lat/Long) but in a
> > > projected system (SAD69/UTM or SAD69/Brazil Polyconic with
> EPSG codes
> > > 29118-29195,29100,29101).
> > >
> > > When you add a layer to a view you have to select (in the
> combo a the
> > > bottom of the form) the CRS of the shapefile. The problem is
> that at this
> > > moment those CRS are not suported. You can select "Manual
> transformation"
> > > in the "Choose reference system" dialog to select the apropiate
> > > parameters of transformation if you know those parameters.
> > >
> > > It will be possible to customize a CRS in the future. You will
> be able to
> > > create your own CRSs, save and use them.
> > >
> > > Javi
> > >
> > >
> > > -----Mensaje original-----
> > > De: gvsig_internacional-bounces at runas.cap.gva.es
> <mailto:gvsig_internacional-bounces at runas.cap.gva.es> en nombre de
> Carol
> > > Enviado el: jue 18/10/2007 16:26
> > > Para: Users and Developers mailing list
> > > Asunto: Re: [Gvsig_english] About gvSIG
> > >
> > > Yes, I am using EPSG 4291 (SAD69 in Lat/Long).
> > > My shapefiles are in this System: SAD69, that is the Oficial
> System used
> > > in
> > > Brasil.
> > >
> > > Carol.
> > >
> > > 2007/10/18, Javier Carrasco < jcarrasco at prodevelop.es
> <mailto:jcarrasco at prodevelop.es>>:
> > > > Do you know exactly the EPSG code the shapefile is using?
> > > >
> > > >
> > > > -----Mensaje original-----
> > > > De: gvsig_internacional-bounces at runas.cap.gva.es
> <mailto:gvsig_internacional-bounces at runas.cap.gva.es> en nombre de
> Carol
> > > > Enviado el: jue 18/10/2007 13:15
> > > > Para: Users and Developers mailing list
> > > > Asunto: Re: [Gvsig_english] About gvSIG
> > > >
> > > > Hi, Javi!
> > > >
> > > > Thanks very much!
> > > > I´ve just made this and now it seems that worked, but the
> coordinates,
> > >
> > > in
> > >
> > > > the view, appear in format Lat/Long with the numbers in UTM.
> > > > For example:
> > > > Lon = 775298º 25´ 58"
> > > > Lat = 9024725º 33´ 21"
> > > >
> > > > Could you help me again??
> > > > Thanks,
> > > > Carol.
> > > >
> > > > 2007/10/18, Javier Carrasco <jcarrasco at prodevelop.es
> <mailto:jcarrasco at prodevelop.es>>:
> > > > > I think you should change the projection system of the
> view before
> > > >
> > > > adding
> > > >
> > > > > the layers.
> > > > > When adding the layers get sure you select the projection
> system the
> > > > > shapefile is using.
> > > > >
> > > > > I hope it helps.
> > > > > Javi
> > > > >
> > > > >
> > > > > -----Mensaje original-----
> > > > > De: gvsig_internacional-bounces at runas.cap.gva.es
> <mailto:gvsig_internacional-bounces at runas.cap.gva.es> en nombre de
> Carol
> > > > > Enviado el: mié 17/10/2007 14:29
> > > > > Para: gvsig_internacional at runas.cap.gva.es
> <mailto:gvsig_internacional at runas.cap.gva.es>
> > > > > Asunto: [Gvsig_english] About gvSIG
> > > > >
> > > > > Hi!
> > > > >
> > > > > I am working with gvSIG and I found some problems. Can you
> help me?
> > > > > I am sending you the files.
> > > > > The files that are in WORD show the problems when I open
> one table,
> > >
> > > for
> > >
> > > > > example, and when I change the projection system.4291
> > > > >
> > > > > The last problem was:
> > > > > 1- I added the shapes to create a new view;
> > > > > 2- I changed the projection system to SAD69 (projection
> used in
> > >
> > > Brazil);
> > >
> > > > > 3- I got to work in this view normally until I close the
> project;
> > > > > 4- In the next day, when I open my project, the view appeared
> > >
> > > distorced
> > >
> > > > as
> > > >
> > > > > show on the attached file:
> > > > >
> > > > > I haven´t gotten to discover yet what is this and every
> time, I have
> > >
> > > to
> > >
> > > > > add
> > > > > the shapes again.
> > > > >
> > > > > I hope that you can help me.
> > > > >
> > > > > Thanks,
> > > > > Carol.
> > > > >
> > > > >
> > > > > _______________________________________________
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> > > >
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>
>
>
> --
> Diego Guerrero Sevilla.
>
> Instituto de Desarrollo Regional.
> Universidad de Castilla-La Mancha.
>
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