For this job, actually I will can CORS also.
The stips for the work are NAD83(86) and NGVD29, based on onsite control.
I'm good backing in CORS to NAD83(93) in my area but I don't want to do it for NAD83(86) except for an academic exercise.:cool:
You can use NADCON to go back from HARN NAD83(93) to NAD83(86). I've done this plus NAD83(86) to NAD27 for my fellow geologists. I stamp "MODELED" all over the NAD83(86) and/or NAD27 coordinates to show that they are derived from a math model.
The question is, "Does the client really wants NAD83(86)?"
Gene Kooper, post: 427381, member: 9850 wrote: You can use NADCON to go back from HARN NAD83(93) to NAD83(86). I've done this plus NAD83(86) to NAD27 for my fellow geologists. I stamp "MODELED" all over the NAD83(86) and/or NAD27 coordinates to show that they are derived from a math model.
The question is, "Does the client really wants NAD83(86)?"
For sure it's 86, they have been using it for a long time, pre 1990, so they are not changing.
I've never actually surveyed with GPS in 86 (did some with instruments), there is a nearby town that has it for their local control and you have to use it if you work for them.
I won't be shifting from NADCON over, they have control points onsite and that's fixed for this control, they also stipulate that NGVD29 is to be used with GEOID 12B, which will be easy enough.
Again, elevations in 29 on their control points.
This is an ongoing topo/drone project and we will tie existing control and new panel points and some id points.
