Menu
▾
▴
Re: [Geotools-gt2-users] Transforming from WSG84 to EPSG 3785
|
From: Juan D. <jua...@gm...> - 2013-06-15 23:28:10
|
Hi sorry for the late reply I have had my hands full and I wanted to test
the code. Anyways this is my code
double lat, lon;
lat = Double.parseDouble(ubicacionDM.getUbicacion()
.getVerbatLatitudUbicacion());
lon = Double.parseDouble(ubicacionDM.getUbicacion()
.getVerbatLongitudUbicacion());
System.out.println("Lat: " + lat + " Lon:" + lon);
Coordinate c = new Coordinate(lat, lon);
GeometryFactory gf = new GeometryFactory();
Point p = gf.createPoint(c);
CoordinateReferenceSystem utmCrs = CRS.decode("EPSG:3857");
CoordinateReferenceSystem codigoEPSG =
CRS.decode("EPSG:"+ubicacionDM.getUbicacion().getZona().getEpsgZona());
MathTransform mathTransform1 =
CRS.findMathTransform(CRS.decode("EPSG:32717"), CRS.decode("EPSG:3857"));
Point p1 = (Point) JTS.transform(p, mathTransform1);
System.out.println(p1.getCoordinate());
When I do this get this
Lat: 815612.0 Lon:9948458.0
(-8701259.838602547, -51846.7213966133, NaN)
They should be close to these values (-0.4544682953,-78.1736736245), where
is my mistake. In another forum someone pointed me that I should convert
from UTM to latitude,longitude and latitude,longitude to EPSG:3857
On Thu, Jun 6, 2013 at 12:49 AM, Ben Caradoc-Davies <
Ben...@cs...> wrote:
> As far as I can tell, the example does what was asked for first
> (Google->WGS84) but not what was asked for second in the clarification
> (Google->WGS84/UTM), which is entirely different. That code appears to
> convert from Google eastings/northings to WGS84 latitude/longitude. I have
> not tested it, but I expect that, to convert from WGS 84 / UTM Zone 17S
> (EPSG:32717) eastings/northings in metres to Google Spherical Mercator
> (EPSG:3857) eastings/northings in metres you should use:
>
> CRS.findMathTransform(CRS.**decode("EPSG:32717"), CRS.decode("EPSG:3857"))
>
> Be sure to test it!
>
> Note that both these CRS are in eastings/northings in metres, not
> latitude/longitude. See also the discussion here:
> http://docs.openlayers.org/**library/spherical_mercator.**html<http://docs.openlayers.org/library/spherical_mercator.html>
>
> Kind regards,
> Ben.
>
>
> On 06/06/13 13:33, Juan Diego wrote:
>
>> Thanks, I know understand a little bit better about the codes, but here
>> is my confusion in the following code
>>
>> public static void main(String[] args) throws FactoryException,
>> TransformException {
>> GeometryFactory gf = new GeometryFactory();
>> Coordinate c = new Coordinate(175784.99999999997, 5842215.0);
>>
>> Point p = gf.createPoint(c);
>>
>> CoordinateReferenceSystem utmCrs = CRS.decode("EPSG:3785");
>> MathTransform mathTransform = CRS.findMathTransform(utmCrs,
>> DefaultGeographicCRS.WGS84, false);
>> Point p1 = (Point) JTS.transform(p, mathTransform);
>>
>> System.out.println(p1.**getCoordinate());
>>
>> }
>>
>> Where is he setting the code for the zone, if I wanted to use 32717, how
>> do I set the zone in mathTransform.
>>
>>
>>
>> On Thu, Jun 6, 2013 at 12:22 AM, Ben Caradoc-Davies
>> <Ben...@cs... <mailto:Ben.Caradoc-Davies@**csiro.au<Ben...@cs...>>>
>> wrote:
>>
>> Juan,
>>
>> each UTM zone has a separate EPSG code:
>> http://spatialreference.org/__**ref/epsg/32612/<http://spatialreference.org/__ref/epsg/32612/>
>>
>> <http://spatialreference.org/**ref/epsg/32612/<http://spatialreference.org/ref/epsg/32612/>
>> >
>>
>> The codes follow the pattern:
>>
>> WGS 84 / UTM Zone xxN is:
>> http://spatialreference.org/__**ref/epsg/326xx/<http://spatialreference.org/__ref/epsg/326xx/>
>>
>> <http://spatialreference.org/**ref/epsg/326xx/<http://spatialreference.org/ref/epsg/326xx/>
>> >
>>
>> WGS 84 / UTM Zone xxS is:
>> http://spatialreference.org/__**ref/epsg/327xx/<http://spatialreference.org/__ref/epsg/327xx/>
>>
>> <http://spatialreference.org/**ref/epsg/327xx/<http://spatialreference.org/ref/epsg/327xx/>
>> >
>>
>> The preferred EPSG code for Google Spherical Mercator is now
>> EPSG:3857. See this discussion:
>> http://wiki.openstreetmap.org/**__wiki/EPSG:3857<http://wiki.openstreetmap.org/__wiki/EPSG:3857>
>>
>> <http://wiki.openstreetmap.**org/wiki/EPSG:3857<http://wiki.openstreetmap.org/wiki/EPSG:3857>
>> >
>>
>> Kind regards,
>> Ben.
>>
>>
>> On 06/06/13 11:46, Juan Diego wrote:http://docs.openlayers.**
>> org/library/spherical_**mercator.html<http://docs.openlayers.org/library/spherical_mercator.html>
>>
>> I was reading this
>> http://osgeo-org.1560.x6.__nab**ble.com/convert-wgs84-__**
>> coordinate-to-Google-Map-__**coordinate-system-EPSG-3785-__**
>> with-geotools-and-java-__**td4983362.html<http://nabble.com/convert-wgs84-__coordinate-to-Google-Map-__coordinate-system-EPSG-3785-__with-geotools-and-java-__td4983362.html>
>> <http://osgeo-org.1560.x6.**nabble.com/convert-wgs84-**
>> coordinate-to-Google-Map-**coordinate-system-EPSG-3785-**
>> with-geotools-and-java-**td4983362.html<http://osgeo-org.1560.x6.nabble.com/convert-wgs84-coordinate-to-Google-Map-coordinate-system-EPSG-3785-with-geotools-and-java-td4983362.html>
>> >,
>>
>>
>> In the example given above by guziy
>> <http://osgeo-org.1560.x6.__na**bble.com/template/__**
>> NamlServlet.jtp?macro=user___**nodes&user=219523<http://nabble.com/template/__NamlServlet.jtp?macro=user___nodes&user=219523>
>>
>> <http://osgeo-org.1560.x6.**nabble.com/template/**
>> NamlServlet.jtp?macro=user_**nodes&user=219523<http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=user_nodes&user=219523>
>> >>,
>>
>> in which line is he setting the zone and the hemisphere, he
>> talks about
>> setting UTM 12N, but I dont know how to set the code from each
>> zone.
>>
>> Thanks,
>>
>>
>>
>>
>> ------------------------------**__----------------------------**
>> --__------------------
>>
>> How ServiceNow helps IT people transform IT departments:
>> 1. A cloud service to automate IT design, transition and
>> operations
>> 2. Dashboards that offer high-level views of enterprise services
>> 3. A single system of record for all IT processes
>> http://p.sf.net/sfu/__**servicenow-d2d-j<http://p.sf.net/sfu/__servicenow-d2d-j>
>> <http://p.sf.net/sfu/**servicenow-d2d-j<http://p.sf.net/sfu/servicenow-d2d-j>
>> >
>>
>>
>>
>> ______________________________**___________________
>> GeoTools-GT2-Users mailing list
>> GeoTools-GT2-Users@lists.__sou**rceforge.net<http://sourceforge.net>
>> <mailto:GeoTools-GT2-Users@**lists.sourceforge.net<Geo...@li...>
>> >
>> https://lists.sourceforge.net/**__lists/listinfo/geotools-gt2-**
>> __users<https://lists.sourceforge.net/__lists/listinfo/geotools-gt2-__users>
>>
>> <https://lists.sourceforge.**net/lists/listinfo/geotools-**
>> gt2-users<https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users>
>> >
>>
>>
>> --
>> Ben Caradoc-Davies <Ben...@cs...>
>> Software Engineer
>> CSIRO Earth Science and Resource Engineering
>> Australian Resources Research Centre
>>
>>
>>
> --
> Ben Caradoc-Davies <Ben...@cs...>
> Software Engineer
> CSIRO Earth Science and Resource Engineering
> Australian Resources Research Centre
>
|