i have a map in bitmap format.The size of picture is 1024 x 720. i need each pixel in the map represent the latitude and longitude. The latitude is from 2.85667000 to 4.01666940. The longitude is from 99.70000000 to 101.46667000. The format of latitude and longitude are decimal. Beside that, when i key in the value of latitud and longitud in text box. it can show which pixel in the picture is related to that value.