Oil & Gas Appraisal It is not often that we do an oil & gas appraisal, but when we do, we work with one of the many skilled Certified Minerals Appraisers (CMA) within the International Institute of Minerals Appraisers (IIMA). Mr. Groff is also a CMA, and all...
Stockpile and Quarry Surveying Groff Engineering has FAA licensed Part 107 sUAS pilots that can safely and legally fly drones to survey quarries and stockpiles. Its pilots and engineers routinely produce datasets that meet ASPRS positional accuracy standards for 3 cm...
