TAG: Survey Scene

Establishing orthometric heights using GNSS — Part 8

August 3, 2016By
Figure-2-T

Upcoming Survey Scene newsletters will carry additional columns in this series. Basic procedures and tools for determining valid published NAVD 88 GNSS-derived orthometric heights for constraints These columns have provided the reader with basic concepts, routines and procedures for understanding, analyzing, evaluating and estimating GNSS-derived ellipsoid and orthometric heights. In my last column, Part 7 (June 2016), we analyzed the changes in adjusted heights... read more

Establishing orthometric heights using GNSS — Part 7

June 2, 2016By
Figure 1. Leveling Network Design Used in the General Adjustment of the North American Vertical Datum of 1988 (Figure 3 from the report).

Basic procedures and tools for determining valid NAVD 88 heights for constraints To date, the six parts of “Establishing Orthometric Heights Using GNSS” have provided the reader with basic concepts, routines and procedures for understanding, analyzing, evaluating and estimating GNSS-derived ellipsoid and orthometric heights. In Part 5 of this series, we discussed National Geodetic Survey’s NGS 59 guidelines and methods for evaluating the results... read more

GNSS and the real-time network: The surveyor’s best friend

May 4, 2016By
North SmaRTK GNSS RTK Receiver being used to survey the forest population in Switzerland. (Wikimedia Commons)

A lot of talk is being made about UAVs these days and how this technology is going to revolutionize many industries, with surveying being one of the biggest users. I won’t deny the impact this new tool is going to have on our profession (as written in my last column). But I don’t think it will compare to the use... read more

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Establishing orthometric heights using GNSS — Part 6

April 6, 2016By

Basic procedures and tools for ensuring GNSS-derived orthometric heights meet the project’s desired accuracy To date, this series of columns has addressed the following topics: basic concepts of GNSS-derived heights, National Geodetic Survey’s (NGS) guidelines for establishing GNSS-derived ellipsoid heights (NGS 58), differences between hybrid and scientific geoid models, procedures and tools for detecting GNSS-derived ellipsoid height data outliers, and basic... read more

Unlicensed UAV services threaten survey profession

March 2, 2016By
drone-in-flight-free-to-use

Unless one has lived under a rock for the past few years, it is hard to miss the influx of unmanned aerial vehicles (UAV), otherwise known as drones. Once considered expensive toys for hobbyists, these vehicles have become the hottest ticket in town for gathering aerial photography and video with professionals and amateurs alike. Miniaturization of cameras, batteries and GPS receivers has... read more

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Establishing orthometric heights using GNSS — Part 5

February 3, 2016By
Figure 9. Plot depicting the changes in adjusted heights due to constraining all published NAVD 88 leveling-derived orthometric heights except for station Phaniel (using GEOID12B) .

Basic procedures and tools for ensuring GNNS-derived orthometric heights meet the project’s desired accuracy
In the latest installment of our ongoing series, the focus switches from GNSS-derived ellipsoid heights to procedures and tools for ensuring GNNS-derived orthometric heights meet the project's desired accuracy. read more

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Data is the crop: GNSS used by surveyors and farmers

January 6, 2016By
Photo credit: ViaMoi via Foter.com / CC BY-NC-ND

As technology continues to march forward, and storage and data evaluation use grows, the surveyor and the farmer will begin to use each other’s skillsets to increase their own productivity. So how do we get there? First, we must establish how each side uses their prospective GPS tools. read more

Establishing orthometric heights using GNSS — Part 4

December 2, 2015By

Part 1 of this series appeared in the June Survey Scene newsletter, Part 2 appeared in the August newsletter, and Part 3 appeared in the October newsletter. Upcoming Survey Scene newsletters will carry additional columns in this series. Basic Procedures and Tools for Ensuring GNNS-Derived Ellipsoid Heights Meet the Project’s Desired Accuracy In Part 1 of this series, I discussed the basic concepts of GNSS-derived... read more