Category Archives: Aerial/UAS

OS 3D GIS Urban Canyon GNSS

Improving GNSS in the Urban Canyon

To prepare you for the this blog post, I wish to point out that I am a geospatial expert and can hold my own around the ins and outs of survey, so going to an event at the Ordnance Survey on “3D mapping for the improvement of GNSS in urban areas” was an eye-opener. You...

The 2017 Flooding of Missouri’s Meramec River

Missouri’s Meramec River is one of the largest free-flowing waterways in the state. With a source southwest of St. Louis, in Dent County, and the mouth at the Mississippi River in Arnold, some 20 miles south of St. Louis, its meandering 220 miles drain nearly 4,000 square miles in a watershed covering six Missouri counties....

Assessing the Potential

UAS-based Topobathymetric Lidar Surveys Understanding stream channel and floodplain morphology is critical for a number of efforts—from hydraulic modeling and stream-restoration design to aquatic habitat assessment. These applications require description of conditions both inside the channels and in the adjacent riparian zones. Gathering these data has typically relied on individuals on the ground or in...

Aerial Imagery to the Rescue

Events in 2017 demonstrated without any doubts or reservations how vitally important georeferenced aerial imagery is in assessing damage and supporting relief efforts following a natural calamity. Last September, an impromptu consortium of companies in North America mobilized their forces and collected and analyzed mountains of data at near cost to help out in what...

Mexico City’s Transportation Revolution

Using drones, lidar, and BIM, enterprising surveyors and geospatial engineers designed and constructed the city’s first high-speed train system. Editor’s Note: Lessons learned from a problematic rail project in Mexico City prompted an initiative to pull out all technological stops for a subsequent new rail line. An innovative, tech-savvy firm that had demonstrated its capabilities...

Seven Standards for Delivering High-quality sUAS Imagery

I recently attended a pre-bid conference where the customer was interested in small unmanned aircraft system (sUAS) imagery over a large enough area that mosaicking of the images was desired. What I thought would be a fairly straightforward conference turned into a knot of questions and exasperation. “How can we do this without ground control?”...