Hello All, I recently came across, the site
http://spatialreference.org/ref/epsg/24378/ which can show
coordinates of projection EPSG:24378 once we click on the map, I am
interested to put the same functionality on my locally hosted html
file and perform the coordinate calculation client side, i.e no server
side calculations from http://spatialreference.org . The code
referred was map.js in the HTML file which is as follows:
function init(code) {
m = new OpenLayers.Map('map', {'maxResolution': 360/512});
m.addLayer(new OpenLayers.Layer.WMS('',
'http://labs.metacarta.com/wms-c/Basic.py', {'layers':'basic'}));
m.addLayer(new OpenLayers.Layer.Markers(''));
m.zoomToMaxExtent();
m.marker = new OpenLayers.Marker(new OpenLayers.LonLat(0,0));
m.layers[1].addMarker(m.marker);
if (window.bounds) {
m.addLayer(new OpenLayers.Layer.Boxes());
m.layers[2].addMarker(new OpenLayers.Marker.Box(bounds));
}
m.events.register('moveend', m, function() {
var c = this.getCenter();
this.marker.moveTo(this.getLayerPxFromLonLat(c));
document.getElementById("out").innerHTML = "Waiting...";
document.getElementById("in").innerHTML = [c.lon,c.lat].join(", ");
var json = '{"type":"Feature", "geometry":{"type":"Point", "coordinates":[' +
c.lon + ', '+ c.lat + ']},"properties":{}}';
var s = document.createElement("script");
s.src = "/projection/?json=" + escape(json) +
"&inref=EPSG:4326&outref="+code+"&callback=project_out"
document.body.appendChild(s);
});
if (window.bounds) {
m.setCenter(bounds.getCenterLonLat());
} else {
m.zoomToMaxExtent();
}
}
function project_out(data) {
if (data.coordinates) {
document.getElementById("out").innerHTML = data.coordinates.join(", ");
} else if (data.error) {
if (window.console) {
console.log(data.error);
}
document.getElementById('out').innerHTML = 'An error occurred.';
}
}
while the html only has following script:
var bounds = new OpenLayers.Bounds(70.329999999999998, 28.0,
97.450000000000003, 35.549999999999997);
defining bounds of this specific projection:
How can i use this code locally, i want to place it in e.g examples folder of
OL 2.9 source, and make it work, but the projection information is missing
which is as follows in WKT:
PROJCS["Kalianpur 1975 / India zone I",
GEOGCS["Kalianpur 1975",
DATUM["Kalianpur_1975",
SPHEROID["Everest 1830 (1975 Definition)",6377299.151,300.8017255,
AUTHORITY["EPSG","7045"]],
TOWGS84[295,736,257,0,0,0,0],
AUTHORITY["EPSG","6146"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4146"]],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
PROJECTION["Lambert_Conformal_Conic_1SP"],
PARAMETER["latitude_of_origin",32.5],
PARAMETER["central_meridian",68],
PARAMETER["scale_factor",0.99878641],
PARAMETER["false_easting",2743195.5],
PARAMETER["false_northing",914398.5],
AUTHORITY["EPSG","24378"],
AXIS["Easting",EAST],
AXIS["Northing",NORTH]]
.
Any help or source code will be highly appreciated.
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