Even though PIX4Dmatic picks up the “ellipsoidal height” column in the .csv, I don’t think it converts it (automatically, anyways). The .csv out of Emlid Flow 360 starts out with orthmetric feet and I like to keep it that way once the coordinates are corrected so I can see the changes. Pix4Dmatic saw the ellipsoidal height as feet, not meters and threw off the model elevation inspite of labeling that column “Ellipsoidal Height”.
I had to manually take the corrected ellipsoidal height and subtract it from the geoid height at a given lat, long to get the orthometric height in meters (using this ellipsoidal to orthometric converter: GEOID18 Interactive Computation | GEOID | Data & Imagery | National Geodetic Survey, then from there I convert to feet. I wish there was an app that did this for me. Anyone know of a simpler way???
I’m using NAD83 / California zone 4 & NAVD88(GEIOD18) heights.
As far as the elevation changers, I believe that I hadn’t download the necessary GEOID18 file onto my phone. Mention of this need is buried deep in an Emlid doc. Apparently, I was making this Emlid Flow projects in the field where there was poor internet and the file never downloaded to my phone thus the poor elevation interpretation. Also, starting a new known point with OPUS solution from NAD83(2011) satellite helped.