Tag Archives: geodesy

Weekly xyHt News Links: 6/16/17

RIEGL has received the Sebastian Sizgoric Technical Achievement Award at this year’s JALBTCX conference in Savannah, Georgia.  Record attendance for GEO Business 2017 Identified Technologies Aligns with DJI to Offer Best-in-class Commercial Drone Solution Survey and Mapping Company Partners with Leading Unmanned and Manned Flight Service Experts Aeroscout launches UAV helicopter for high-altitude flight Congress increases funding...

Foundations for Computing Error Ellipses, figure 2

Part 1: Foundations for Computing Error Ellipses

Standard Error Rectangle and Error Ellipse What is an error ellipse? One of the advantages of a least-squares adjustment over other methods is that a byproduct of the adjustment is not only the most probable values for the unknown coordinates but also standard deviations on these values Suppose for a moment that we are computing...

Equations 1, 2, 3 & 4: combined factor grid distance, elevation factor

GNSS & Educational Equations: A Grid-to-Ground Project

When planning GNSS control surveys on highway projects, it is important to understand the limitations of GNSS. Most highway projects are long, and linear distances that are wide open horizontally and vertically and are ideal for GNSS surveying. However, in rural and city areas, tree canopies and high-rise buildings will obstruct the GNSS signals, so...