Category Archives: Hydro/Marine

Instructors Brenda Densmore (far right) and Paul Rydlund (far left) bracket their students from a class held in Northborough, MA. Credit: USGS.

Surveying Scientists: The USGS Does It Right

As is often the case in our tightly networked profession, one thing leads to another. In early 2017 I was contacted by the US Geological Survey (USGS) hydrologist, Brenda Densmore, from the USGS Nebraska Water Science Center. Brenda had found me through the NGS State Geodetic Coordinator web page and reached out to me for...

Michelle Japitana

Instructor and Concurrent Chairman, Engineering Sciences Department, Carga State University, Philippines Testimonials for Michelle Japitana were remarkable. (This year we received a record number of nominations from the Philippines, and we wish we could honor all the fine candidates.) Michelle’s nominators noted that her strength in the geospatial community is her research capabilities in the fields...

The SD Moorfowl lifts a Highball from Loch Striven.

Recovering the Bouncing Bombs

Sidescan sonar helps a hydro survey team and a dive club find and raise the famous bouncing bombs from WWII. (Above: The SD Moorfowl lifts a Highball from Loch Striven.) As of May of 2018, it will be 75 years since the famous German dam buster raid by the Royal Air Force. The raid used...

Because lidar is line of sight, there are many areas that cannot be captured from the shore

Yaw, Pitch, and Roll

Nautical lidar works for a waterway bridge replacement project in Boston. Waterway projects can pose major challenges for surveyors and engineers needing survey-grade data because of unpredictable variables in the marine environment. Surveyors face inaccessible areas, tidal changes, marine traffic, and unpredictable weather, as a few examples. The Massachusets department of transportation (MassDOT) undertook an...

Eclipse Background, NASA

Night in the Afternoon: A US Solar Eclipse

What you need to know about the 2017 solar eclipse The upcoming solar eclipse will leave a 70-mile-wide trail of darkness across the United States on August 21, 2017 (see the map of the eclipse path on pages 44-45). This will be a once-in-a-lifetime event for many people. While another total solar eclipse will make...

Surveying a Mile Down

Above: The metrology viewed as a combined model. A 3D surveying company provides highly detailed lidar data on subsea drill centers. This article almost didn’t happen. I first met with ADUS DeepOcean in January 2017, when we discussed how they had captured high-resolution laser data deep in the ocean off Ghana. Today, four months later, I...