[GIS] get the coordinates of country borders from Google Maps

coordinate systemgoogle earthgoogle maps

I need to get the coordinates of a country's border (e.g., Iraq) from Google Maps. How can I do that?

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Best Answer

Get the x,y coordinates of the boundaries of countries from the following website Natural Earth (thanks, Devdatta Tengshe) which has more accurate data than others I've tried. Then use ArcGIS 10.2 to open the map shape file and select the boundaries you need. Go to data management tools --features-- features vertices to points and open the generated table. Add two new fields (lat, long) to the table. (I use geometry calculations.) Export the table to get the desired data.

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[GIS] Google earth Borders on Google maps

No, it is not possible for you to access the underlying geometry that is used to represent these borders in Google Earth. Nor is it possible to use them separately in Google Maps as KML.

Your best bet would be to find a My Maps layer (if you can find one).

[GIS] reset “latlng” coordinates on Google Maps

It is actually possible to place your top left corner at 0,0 and your bottom right at 50,50, if you want this. Of course you can place bottom right corner at 10,10, too, or whatever, within the limits: -90/+90 for latitude and -180/+180 for longitude.

The proportion should be:

/*
****************************************** 
Custom Projection - CARTESIAN
******************************************
*/

function CartesianProjection() {
    // map size at zoom 0 is equal to tile size
    this.tileSize = 256;
};

CartesianProjection.prototype.fromLatLngToPoint = function(latLng) {
    var x = (latLng.lng() / 50) * this.tileSize;
    var y = (latLng.lat() / 50) * this.tileSize;
    return new google.maps.Point(x, y);
};

CartesianProjection.prototype.fromPointToLatLng = function(point, noWrap) {
    var lng = (point.x / this.tileSize) * 50;
    var lat = (point.y / this.tileSize) * 50;
    return new google.maps.LatLng(lat, lng, noWrap);
};

Then you should place the center of the map to LatLng(25,25) in the Map options.

Best Answer

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[GIS] Google earth Borders on Google maps

[GIS] reset “latlng” coordinates on Google Maps

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