[GIS] How to get the values returned by an OpenLayers bounds object in Longitude / Latitude format

coordinate systemopenlayers-2

I've created a map and added a layer using the OpenLayers library:

map = new OpenLayers.Map('map');
var gphy = new OpenLayers.Layer.Google("Google Physical", {type: G_PHYSICAL_MAP});
map.addLayer(gphy);

The map loads and I can center my map:

map.setCenter(new OpenLayers.LonLat(-114.922485, 56.400224), 4);

I've then created a box handler, but the bounds returned aren't in Longitude / Latitude format. When drawing a box around the center of my map, my bound object returns the following:

left-bottom=(278,245) right-top=(304,211)

How can I convert these values into Longitude / Latitude?

The resolution thanks to unicoletti:

map.getLonLatFromPixel(new OpenLayers.Pixel(bounds.left, bounds.bottom))

Best Answer

Assuming that those are pixel coordinates you can use:

map.getLonLatFromPixel

or one of the other pixel to lat/lon conversion functions of the map object. Check the documentation relevant to your OL version for a detailed explanation.

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I'm new to openlayers but this helped me you only need a center point (long lat) and a radius don't forget the function createGeodesicPolygon

Creating vector features onload in OpenLayers

there is a link to a demo

var origin = "new OpenLayers.Geometry.Point(Long Lat)"; 
//then set the radius here 
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hope that helps

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you can catch your opened(active) popup with this way:

map.popups[a]

you can change so update its content:

map.popups[a].contentHTML = 'Test Content';
map.popups[a].redraw();

or

map.popups[a].setContentHTML = 'Test Content'

you can show or hide your popup:

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map.popups[a].hide();

you can update position of your popup:

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As the last question, i dont understand very well what you want? but try to use removeFeatures instead of destroyFeatures....

i hope it helps you...

Best Answer

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[GIS] How to make a predetermined polygon (circle) from 4 coordinates, the radius and center Longitude and Latitude in OpenLayers

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