Hi Justin. Thanks for your quick answer!
I'm currently using geotools 2.4 and I don't want to switch to 2.5 yet given
the fact that the project I'm on is to be used by the comunity of my city,
so I would like to work with the more stable possible version.
In this version, I tried to make a CRS.decode("EPSG:4694") but didn't
success.
What I am willing to do (the intentions at least) you can see it in this
little piece of non-working code: (you can say it is pseudo code)
public double distance(Node orig, Node dest){
// POSGAR = EPSG:4694
double dist;
Point x,y;
dist = -1;
x = ((Point) orig.getObject());
y = ((Point) dest.getObject());
try {
GeodeticCalculator gc = new
GeodeticCalculator(CRS.decode("EPSG:4694));
gc.setStartingGeographicPoint(x.getX(),x.getY());
gc.setDestinationGeographicPoint(y.getX(), y.getY());
dist = gc.getOrthodromicDistance();
System.out.println("Distance between nodes in meter: "+ dist);
}catch(Exception e){
e.printStackTrace();
}
return dist;
}
Two problems arise: First, the one about EPSG:4694 not been recognized.
Second, the one about the coordinates of points, which are incredible big
numbers.
What I am probably not understanding is what is the meaning of "projected
coordinates", or how are coordinates projected.
Anyway, I am trying to do just a simple operation of distance in meters,
given the fact that I will need to tell blind people how to get from one
place to another with my software.
Thanks in advance
Fran
Justin Deoliveira-4 wrote:
>
> Hi Fran,
>
> I am not exactly sure I understand the problem. Working with the graph
> in projected coordinates should work just fine, there should be no need
> to transform the coordinates to lat/long, unless you have that
> requirement.
>
> As for EPSG:4694, i notice that it is supported in recent version of
> geotools:
>
> GEOGCS["POSGAR 94",
> DATUM["Posiciones Geodesicas Argentinas 1994",
> SPHEROID["GRS 1980", 6378137.0, 298.257222101,
> AUTHORITY["EPSG","7019"]],
> AUTHORITY["EPSG","6694"]],
> PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
> UNIT["degree", 0.017453292519943295],
> AXIS["Geodetic longitude", EAST],
> AXIS["Geodetic latitude", NORTH],
> AUTHORITY["EPSG","4694"]]
>
> Which version are you using?
>
> -Justin
>
> FranGM wrote:
>> Hi there.
>> I've got a shapefile of my city which a turned into a graph. Now I wanted
>> to
>> use a DijkstraShortestPathFinder. To create a weighter I want to find out
>> the length of each edge of the graph (the orthodromic distance between
>> its
>> nodes).
>> Each Node has a "getObject" method from where you can get a Point with
>> coordinates. What I would like to know is how are this coordinates (big
>> doubles with around 7 non decimal ciphers) related to "real coordinates"
>> (lat/long).
>> Thing is, my data seems to be in ARGENTINA POSGAR94, zone 4, datum WGS84
>> (as
>> I can read in the readme file). I found over the net that this
>> corresponds
>> to EPSG:4694, but it seems that the GeodeticCalculator class does not
>> know
>> about it.
>> In other words, I think I'm getting troubled with something that is
>> probably
>> easy.
>> May anyone lend me a hand in this subject?
>>
>> Thanks in advance
>>
>> Fran
>>
>
>
> --
> Justin Deoliveira
> The Open Planning Project
> http://topp.openplans.org
>
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