plotting latitude on to a (Mercator projection) SVG map
latitude-longitude, mapping
Solution
In your calculations of `lattest` and `mapOffsetY` inside `secondconvert()` you're using variable `width` where Raphael's solution uses `worldMapWidth`. Fixing that you get closer to the expected result, though still not precise.
Problem
I want to convert (google sourced) longitude and latitude coordinates to x and y to place points on a SVG map I can get the longitude converted to X but I can't nail latitude. http://jsfiddle.net/chrisloughnane/an3BZ/17/ - red dots = place holders - green dot = calculated position from longitude/latitude I have read so much about Mercator projections and other projection systems API's I am now completely confused. I also followed Proj4JS library threads but couldn't find an example that was close to my task. I attempted to emulate this solution, unfortunately I got something wrong. Could someone please have a look at my jsfiddle and see if it's an obvious mistake. The second test function secondconvert(latitude, longitude) (bottom of javascript pane) provides me with a reasonably accurate x coordinate i.e. if I manually enter the y coordinate `b.ylat` change to `265` it covers my left red dot place holder nearly perfectly. I think I'm close, any help would be really appreciated. tia. Original SVG from here.