Coordinates to Tile Pixels
I Am Developing a Tile Overlay Server for Google Maps. I Want to Draw a Point on a Tile for a Specific Location. How Can I Convert the Real World Coordinates...
I am developing a tile overlay server for google maps. I want to draw a point on a tile for a specific location. How can i convert the real world coordinates to tile pixel coordinates?
I have calculated a tile's bounds so i know if a given point is inside it. My problem is where in the tile should i draw it.
Interpolation works ok for longitude but not for latitude, which is normal for mercatoric maps.
Unfortunately my trigonometry skills are a bit rusty. Could someone give me a hint?
I am using 256x256 pixel tiles. The zoom level, x and y are also given for a tile.
1 Answer
I found the answer here. I had to tweak it a bit:
var offset = 256 << (z-1) - (256 << (z-1))/Math.PI * Math.log((1 + Math.sin(lat * Math.PI / 180)) / (1 - Math.sin(lat * Math.PI / 180))) / 2;
circley = offset - 256*y;
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