Method and apparatus for generating map data from images

An apparatus for mapping a geographical location of a feature in a satellite image, the apparatus comprising:

• a processing unit arranged to:
• obtain an image of a geographical surface, wherein the image comprises a plurality of pixels;
• obtain data indicating the latitude and longitude of each vertex of the image;
• obtain data relating to a grid corresponding to the image;
• receive a grid location of a feature in the image, wherein the grid location identifies a particular grid cell in the grid;
• and
• translate the grid location into a geographical location;
• wherein the processing unit is arranged to translate the grid location into a geographical location by:
• calculating a pixel space location of at least one vertex of the identified grid cell;
• converting the pixel space of the image into a latitude/longitude space based on the obtained data indicating the latitude and longitude of each vertex of the image;
• and
• determining the latitude and longitude of the at least one vertex of the identified grid cell, based on the calculated pixel space location and the latitude/longitude space output by the converting.