You can’t unless you know which X & Y you want/mean. It is NOT correct to say that y is latitude and x is longitude!! XY means you use a cartesian coordinate system (the map = flat rectangle) instead of lat & lon which are angles from the center of a spheroid or ellipsoid (the globe = a 3D object).
We call the transformation from 3D globe to flat map a projection. There are endless ways of projecting. Choose one of those projections and do the math and then you go from lat-lons to y-es and x-es... For a nice overview of all this see e.g. https://kartoweb.itc.nl/geometrics Yours, -- Barend Köbben Senior Lecturer/Researcher – ITC-GIP Thesis Coordinator STAMP & M-CARTO (Joined Erasmus Mundus MSc in Cartography) University Twente, PO Box 217, 7500 AE Enschede (The Netherlands) +31-(0)53 4874 253 / room 1303 Langezijds (Hallenweg 8) On 18/08/2025, 21:53, "Luca Bertoncello" <lucab...@lucabert.de> wrote: Am 18.08.2025 um 17:34 schrieb Robert Hewlett: > First step, make sure you are not crossing over. > > You say x y but latitude longitude is y x. Yes, I know... y is latitude and x is longitude... How can I calculate them? Thanks Luca Bertoncello (lucab...@lucabert.de)
