Unmanned Systems Source has released an article designed to help surveyors decide when to use photogrammetry or LiDAR for surveying and mapping via drone. Drone technology has made a huge impact on aerial mapping and surveying. Drones offer many advantages including the ability to capture photos at predefined elevations and at a predetermined overlap percentage. Today, drones mounted with LiDAR systems can map these same areas quickly, affordably and with far less logistical issues.