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Newlyn Harbour Lighthouse

Dealing with Vertical Datum, the Mariners’ Way

Before 3D GIS, we were able to measure miles below the sea and miles beyond our own atmosphere to a great level of accuracy, so how did we do it? There are a few methods for working between vertical coordinate systems, but the one I want to discuss is possibly...


Mapping Rwanda: Surges Forward in UAS Mapping Use

This entry is part 4 of 8 in the series June 2017From cadastral to precision agriculture to humanitarian aid, UAS are making a big difference while mapping Rwanda. (Above: Course participants examine an orthomosaic in Pix4Dmapper during software training.) After Rwanda made waves in the news early last year for allegedly...


Shifting Ground: USGS on Earth Movement after an Earthquake

This entry is part 3 of 8 in the series June 2017Ken Hudnut, science advisor for risk reduction, US Geological Survey, talks GPS and earthquakes. Editor’s note: In many ways, we are all participants in a grand scientific endeavor that’s on the cusp of helping humankind prepare for some of...