CODEWITHSUNDEEP
kmlgoogle-earth-pluginutm
user1444402
user1444402

Reputation: 23

set UTM (Universal Transverse Mercator) coordinates property on Google earth api

I'm want to create a kml with UTM coord when I set a new placemark. This is my code but I don't know where I have to set this property

//part of the code
counter++;
placemark= makePlacemark(hitTestResult.getLatitude(), hitTestResult.getLongitude(),
          hitTestResult.getAltitude(), ge.ALTITUDE_ABSOLUTE, 'T');
//set placemark name
placemark.setName("PLM" + counter);
//set the placemark on the map
ge.getFeatures().appendChild(placemark);

var output = placemark.getKml();
alert(output);

function makePlacemark(lat, lng, alt, altMode, iconStr) {
        var icon = ge.createIcon('');
        icon.setHref('http://maps.google.com/mapfiles/kml/paddle/' + iconStr + '.png');

        var style = ge.createStyle('');
        style.getIconStyle().setIcon(icon);
        style.getIconStyle().getHotSpot().set(0.5, ge.UNITS_FRACTION, 0,ge.UNITS_FRACTION);

        var pt = ge.createPoint('');
        pt.set(lat, lng, alt, altMode, false, false);
        var pm = ge.createPlacemark('PLM' + counter);
        pm.setGeometry(pt);
        pm.setStyleSelector(style);

        return pm;
}

You will need to transform (reproject) your coordinates from your UTM projection to epsg:4326

Does it means that Google Earth application uses additional transformations to show the coordinates in UTM? Used it Tools->Options

Upvotes: 1

Views: 6184

Answers (3)

Berwyn
Berwyn

Reputation: 201

as stated in earlier posts you will need to convert your UTM coordinates to long lats

a good tool for this client side is: http://trac.osgeo.org/proj4js

see example:
http://trac.osgeo.org/proj4js/wiki/UserGuide

as also stated in an earlier post : destination coordinates epsg:4326 , the example has them as the source

source for proj4 will be your utms.

with proj4js, and UTM zone 10 north, http://spatialreference.org/ref/epsg/32610/ :

var dest= new Proj4js.Proj(‘EPSG:4236’);     
var Source= new Proj4js.Proj(‘EPSG:32610’);     

// transforming utm ngcoordinates
var p = new Proj4js.Point(489399,5456814);   

Proj4js.transform(source, dest, p);     

var lng= p.x ;
var lat= p.y;

Upvotes: 0

GEsim
GEsim

Reputation: 11

The best server-side coordinate transformation I've found is here:

http://www.jstott.me.uk/phpcoord/

I've used this for years in conjunction with my Google map and GE plugin code.

Anyone know a javascript equivalent?

Upvotes: 0

jlivni
jlivni

Reputation: 4779

The KML spec specifies latitude and longitude on the WGS84 datum. Arbitrary projections are not supported.

You will need to transform (reproject) your coordinates from your UTM projection to epsg:4326 and then enter the latitude and longitude appropriately.

Upvotes: 2

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