Terrain correction systems

A data processing system for processing measured potential field data from a moving platform potential field survey for mapping a field, the system comprising:

• data memory for storing measured potential field data, said measured potential field data comprising data defining a time series of potential field measurements captured by a potential field measurement instrument mounted on a moving platform, each of said measurements having associated data defining positions of said measurements as a function of time, and for storing terrain data defining a spatial variation of terrain surveyed by said potential field survey;
• and
• program memory for storing processor control code;
• and
• a processor coupled to said data memory and to said program memory to load and implement said control code, said control code comprising code to cause the processor to:
• input, to said processor, said measured potential field data and said associated data for said measurements;
• input, to said processor, said terrain data;
• determine, by said processor, time-domain correction data to be applied to said measured potential field data in the time-domain, said determining comprising:
• using said terrain data and said associated data defining positions of said measurements as a function of time;
• and
• compensating, by said processor, for a bandwidth of said potential field measuring instrument, wherein said compensating for said bandwidth comprises filtering, by said processor, said time-domain correction data using a filter matched to an impulse response of said instrument;
• and
• adjust, by said processor, said measured potential field data defining said time series of potential field measurements using said time-domain correction data to provide terrain corrected measured potential field data for said mapping of said field.