Ellipsoidal height vs elevation?

[marjo]

Hi!

I wonder what the difference is between the ellipsoidal height and elevaition

[michaelL (Michael Lambert)]

Here’s an old thread with a good amount of discussion on what it all means and how it is applied to different use cases.

Orthometric Heights

I am trying to get more surveying use out (initially setting GCP’s) of my Emlid solutions and have had a specific scenario pop up a few times recently that I am trying to work around. We started using our drone to capture topographic information for our pre-bid services and at that stage we have very little or no information to come off of. Because of this I have had to do localizations to keep my surveys on the same basis as the information we have been provided by the surveyors/engineers. I h…

[TB_RTK]

Funny. Reading the linked thread, I got all carried away, forgot how old that topic was and almost posted "have you solved this yet? "

[julia.shestakova]

Hi @marjo,

Sorry for the late comments!

In short, the Ellipsoidal height is the height in WGS84 or the datum of the base if you work in RTK. The Elevation field contains the height in the height system you’ve chosen for the project when you created it.

If you’ve left ellipsoidal heights as the vertical datum, the values in these two fields will be the same. However, if you selected a geoid model, the Elevation field will contain the height of the point in it.