iGage
iG8 User Manual
65
The displayed Ellipsoid height (4290.1518) is the Ground Mark (GM) elevation.
Ground Mark (GM) 4290.1518 sFeet = 1307.6409 m Ellipsoid
When you click on the ‘Store in Point List’ button, the point is stored in the .RW5 file with raw data (it is not just a
Stored Point (SP)).
Here is a snippet showing the two lines that ‘Store in Point List’ generates:
GPS,PN1,LA40.441040975179,LN-111.513363514941,EL1309.754897,--BB
--GS,PN1,N 7437123.6609,E 1540829.5613,EL4344.9974,--BB
Discussion:
This ‘GPS,’ line has the base position in DD.MMSSsssssss, the height is the ellipsoid height of the antenna L1 Phase
Center (PC) in meters. This is the ‘raw’ data for the base point.
This ‘--GS line’ is the grid coordinates and Orthometric Height of the Ground Mark in sFeet: 4344.9974
The point list entry (File: Points) looks like this:
This point matches the --GS line in the raw file. Note that the elevation is the orthometric height of the Ground Mark.
After the base begins transmitting, the Base Info screen on the iG8 display displays the Phase Center with Ellipsoid
Height in meters:
B: 4 0:4 4:1 0.4 09 7
L: 1 11: 51: 33. 63 51
H: 1 309 .75 49m
Canc el
The displayed height ‘ H:’ is the antenna Phase Center ellipsoid height in meters.
.REF File Description
When you finish setting up the base, SurvCE prompts you to ‘Save Settings to File’:
You always should click on ‘Yes’.
This is the .REF file that is generated: