Re: [udig-users] WGS84 problem

[Jody Garnett <jody.garnett@xxxxxxxxx>]

The correct solution here is to define a custom CRS that actually matches the data; the uDig environment has the tools to do this; what is needed is a bit of research / reading.

I do not think there is a need to look functions; the data is *correct* - we just need to have the proper description so that uDig can use it.

Did you want to mess with the unit setting a bit? I do not have any sample data so I feel a bit like I am making suggestions from the side line.

There is some scary background reading here: http://docs.geotools.org/latest/userguide/library/referencing/internal.html

But really all the same settings are available from WKT; it would be easier to read the standard or ask the person who gave you the data for the correct WTK (or ".prj" file).

-- 
Jody Garnett

On Thursday, 8 September 2011 at 9:39 PM, andrea antonello wrote:

While scaling a projected system might be useful, I don't think that
it makes much (physical) sense to scale a geographic coordinate
system.
So I assume there is no way to scale the WGS84 system (but I might be
wrong) from the projection definition.

Perhaps through the new sld functions that geotools added lately? But
I would not know how. Jody?

Ciao,
Andrea



On Wed, Sep 7, 2011 at 2:13 PM, Jody Garnett <jody.garnett@xxxxxxxxx> wrote:

You can define your own custom "CRS" for the layer.
1. right click on the layer (after you have loaded it)
2. choose the CRS property page
3. select a good normal WGS84 starting point (such as "EPSG:4326") it should
look something like this:
GEOGCS["WGS 84",
  DATUM["World Geodetic System 1984",
    SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]],
    AUTHORITY["EPSG","6326"]],
  PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
  UNIT["degree", 0.017453292519943295],
  AXIS["Geodetic longitude", EAST],
  AXIS["Geodetic latitude", NORTH],
  AUTHORITY["EPSG","4326"]]
4. Switch to the tab that lets you define your own
5. Modify the "well known text" description so that the axis information is
different (and matches your data)
I hunted down some examples for you here:
- http://docs.geoserver.org/latest/en/user/advanced/crshandling/customcrs.html
it looks like the "scale factor" may actually just allow you to do what you
want? The "Well known text" is actually a standard defined by the OGC - so
if you really get stuck you can read the standard?
--
Jody Garnett

On Wednesday, 7 September 2011 at 5:38 PM, Mirza Hadzic wrote:

Hello, I have problem with dataset (MySQL) which is stored in integer WGS84
coords, so it is multiplied by 1 million. For example coordinate 24.002525
is stored as 24002525 (same rule for both coords). Is there any magic in
uDig to display this?
_______________________________________________
udig-users mailing list
udig-users@xxxxxxxxxxxxxxxxxxxxx
http://lists.refractions.net/mailman/listinfo/udig-users


_______________________________________________
udig-users mailing list
udig-users@xxxxxxxxxxxxxxxxxxxxx
http://lists.refractions.net/mailman/listinfo/udig-users