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I have some points in NAD83. I know how to convert their location to NAD27 (need to do this to match some old data), but how can I convert the elevations to match?
So, I think it would actually be a conversion between NGVD 29 and NAVD88, right? Anyway, I know the conversion isn't the same everywhere because of differences in the geoid or whatever, but wouldn't it be pretty close to the same in one area of a city?
you can use Corpscon (http://crunch.tec.army.mil/software/corpscon/corpscon.html) ton find the elevation difference between NGVD29 and NAVD88 datums in your area of interest (using lat long or Northing-Easting of your project area), then right click points group>edit points, in the panorama, CTRL+A to select all your points,then right click anywhere on the table area, select Datum, and type the elevation difference between the datums (be careful if you need to add or subtract).
I found that Vertcon will do what I want. There is also a Vertcon plugin for Google Earth that works pretty well. I was able to use that to get what I need.
