Measuring the World
Why Elevation Follows Gravity: The Geoid Beneath Every Height
GNSS measures height above a mathematical ellipsoid, but practical elevation depends on gravity, the geoid, and a physical definition of level.
From the Index
Tag: NSRS Modernization
Stories about the modernization of the United States National Spatial Reference System and what changes mean for surveyors and readers.
Measuring the World
The New NSRS Is Coming: A Field-to-Office Guide for Surveyors
An entry-level, field-to-office guide to NATRF2022, NAPGD2022, SPCS2022, epochs, height modernization, and preparing survey workflows for the modernized National Spatial Reference System.