I am looking for a program or web calculator that will allow me to enter a known lat/long or coordinate and report back to me the grid/map convergence for that state plane system (or some other system) location.?ÿ I need to do calculations from true north.?ÿ I know Civil3D has a geodetic analysis feature that allows me to enter a project point and it tells me this and other info.?ÿ Any other ideas?
-Scott
NGS returns the convergence (and scale) in their State Plane and UTM programs. Both are downloadable.
My go to for most simple conversions between SP/UTM/LatLong is Corpscon6
Gives the scale factor and convergence
Works on single conversions or batch files
Can download for free here at: http://www.agc.army.mil/Missions/Corpscon/
Perfect - just what I was loking for.?ÿ Thanks.
So just thinking.....are there any programs that give combined, grid, and elevation scale factors??ÿ The NGS program just gave grid scale factor.
Corpscon6 provides the combined grid factor when converting a point that has an elevation.
I use StarNet?ÿ to do that when needed. It's not what the program is for, but it can easily be tricked onto doing it for you. ?ÿ
Corpscon6 provides the combined grid factor when converting a point that has an elevation.
And the factors are correct IF the output is chosen to be NAVD88.
We dissected the problem toward the end of an old thread
This is from the CORPSCON website just a few moments ago:
KNOWN BUGS
- CORSPCON 6.0 provides an erroneous Combined Scale Factor.?ÿ
Some folks in our organization have an earlier download of Corpscon6 that gives a combined scale factor. Mine, downloaded a few months ago, gives the CSF as -999.00000 on the output screen. I use TBC to get scale factors, which are very close, but not identical, to the ones given by the earlier Corpscon6.?ÿ
I'll have to defer to Trimble on this one.
KNOWN BUGS
- CORSPCON 6.0 provides an erroneous Combined Scale Factor.?ÿ
That note has been there for a long time.?ÿ We tracked down the conditions under which it gave bad CSF and that turned out to be a non-NAVD88 output selection improperly dealt with.
Sin of lat times delta long equals convergence...
Corpscon 6.01 does exactly what I want.?ÿ Thx for the replies.
