CODEWITHSUNDEEP
javajavascriptactionscript-3geolocationlatitude-longitude
Tyler Egeto
Tyler Egeto

Reputation: 5495

Convert pixel location to latitude/longitude & vise versa

I need to convert latitude longitude values into pixel positions as well as do the opposite. I've found many solutions to go from lat/lng->pixel, but can't find anything on the reverse.

A couple of notes:

A solution in almost any programming language would be fine, as long as it doesn't rely on any platform specific APIs.

This is an example of going from lat/lng->pixel:

var y = Math.round(((-1 * lat) + 90) * (this.MAP_HEIGHT / 180));
var x = Math.round((lng + 180) * (this.MAP_WIDTH / 360));

Upvotes: 10

Views: 15819

Answers (1)

Markcf
Markcf

Reputation: 165

var y = Math.round(((-1 * lat) + 90) * (this.MAP_HEIGHT / 180));
var x = Math.round((lng + 180) * (this.MAP_WIDTH / 360));

Use some algebra and I came out with:

var lat=(y/(this.MAP_HEIGHT/180)-90)/-1
var lng = x/(this.MAP_WIDTH/360)-180

Not completely confident in that math since it was done in my head, but those should work, just make sure to test them first.

Upvotes: 9

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