There really is no “true” elevation data only relative to its reference.
Thank you for the wonderful help This is something that baffles me a bit until I completely understand it. Origin for a GEOID would be determined by my location from the GEOID. Origin to me for WGS84 would be at the ellipsoid. (I guess where is the origin start for vertical? kind of like 0,0 for X,Y or Y,X (N,E). Is the vertical benchmark I happen to get from them based on Mean Sea Level (MSL) in reference to a GEOID or WGS84 ellipsoid… sorry I get confused exactly what I get here. Then as you say, if no other monuments etc with good vertical benchmark elevation, would have to run a level loop. I guess say in my case for simplicity, I would need at least (1) KNOWN point very close to my property and set base on it, and plug in provided LLH. Thank you is a typical “GIS Portal”? it is an account you create with the city/county for access to surveys on record and obviously GIS data? Is it typical for them to charge for this information, or shouldn’t it be public record without fees typically? I haven’t really had a need for vertical, but now do. I guess I would need to do the same for a known ground elevation also but just don’t know how to get that known ground height? I know I can also use FG to LOCALIZE to Northing and Easting coordinates in the field. I can load a GEOID for my region also, but I want to know the actual vertical GROUND elevation of my property at each of the 4 corner points? But it still reads vertical based on WGS84. I can also do this in MicroSurvey FieldGenius (FG) and assign NAD83 or a State Plane coordinate system for Northing and Eastings instead of Lat Long. How do I get the actual GROUND ELEVATION reading of each of those property points using ROVER? Not just the ellipsoid height, but the physical ground elevation? Do I have to locate a KNOWN point close by in the area as a reference or control point then the rest base from there? How do I get the known coordinates and actual ground elevation that matches that known physical point so I can load it into the BASE? It records my LLH (or XYZ) using WGS84 in METERS. So say I measure the points using ReachView Survey. I know ReachView uses WGS84 ellipsoid for vertical height.įor the sake of simplicity, I’ll measure 4 points of my property boundary using a Reach RS ROVER and a Reach RS BASE.
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