East Bay Chapter CLSA

CLSA July Webinar "Demystifying Reference Frames and 3D Datums"

Wednesday, July 12th, 2017 at 11am - 12pm Friday, July 14th

Location: Webinar

This event is in the past.

Hello All,

Our State CLSA is presenting their July Webinar on Demystifying Reference Frames and 3D Datums. These webinars are free for Members of the State Chapter and $25 for guests (fee can be used toward membership if desired).

 Greg Helmer - GA Helmer Consulting

Program Description:

If my Quad Map is in NAD27 and my GIS land base is in NAD83, my local control network is in the 2011.00 epoch and the satellite orbits are in WGS84... or maybe it's ITRF14 or 08... oh, I'm so confused. And then there's elevations. If I'm using Geoid12B with NAVD88, and I need to know local MLLW, do I need to stand on my head and drink from a tide gauge to face up?

It's no wonder that really-smart people are so confused. And it's going to get worse. The proposed modernization of the National Spatial Reference System in 2022 promises to bring coordinates and elevations into closer alignment with GNSS orbits, and to introduce an additional transformation parameter in the form of a Euler pole and rotational velocity. Stay tuned. This webinar attempts to walk through the concepts of basic geodesy from plane coordinates, to earth-centered-earth-fixed cartesian coordinates, to spherical coordinates in inertial space, and 14-parameter transformation models; and yes, Euler poles, as well as gridded velocity models. If your head is not spinning by then, we will touch briefly on geopotential heights.

Please click on the link below for more information and registration details:




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East Bay Chapter CLSA

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