First step, make sure you are not crossing over. You say x y but latitude longitude is y x.
All the best On Mon, Aug 18, 2025 at 6:40 AM Luca Bertoncello <[email protected]> wrote: > Hi list! > > Sorry, I'm OT, but I don't know other one that (hopefully!) can help > me... > > So, my problem: I have a map, generated from Tiles (generated from OSM, > but this is not very important). > The map is NOT the whole word, just a little part. > In my currently test case, about 2°x2° and this is 1792x1536 pixel. > > I need to calculate the X,Y position starting from the coordinates > (latitude, longitude). > I searched many procedures in Internet, but I cannot locate a marker at > the wanted place... > > I tried to ignore that the word is almost a sphere and calculate the X,Y > as this is flat (X and Y are the size of the map related to the delta of > coordinates), but the position is always wrong. > > Now, I'm not very good (AKA: very bad!) in geometry, so I really don't > know how to solve my problem. > > I'm working in PHP, but a generic example of the procedure is enough. > > Can someone help me? > > Thanks a lot > Luca Bertoncello > ([email protected]) >
