Posted by Matt on 5/19/2017 to Knowledge Base
To capture horizontal (horizontal datum NAD83) and elevational data (vertical datum NAVD88), the university needed to determine first the required accuracy and if there was an affordable technology solution that could accomplish the task. By working with the GNSS experts at Anatum Field Solutions and their review of Bluetooth GNSS options, the EOS Arrow 200 RTK-GNSS using Esri’s Collector app, paired with an existing campus base station transmitting centimeter-level RTK corrections via the Internet, met all requirements for horizontal accuracy.
However, they needed to capture the vertical datum in NAVD88. This explains the differences between Height Above Ellipsoid captured by Mobile GIS apps and how to convert that elevation data to MSL (NAVD88).