New Post: Projections for Hawaii

Mogikanin, thanks for your reply. I now know enough more to make my post a little clearer. I have previously gotten DotSpatial from Nuget and I have updated to the latest version 1.6. And I have recently downloaded the source code just for browsing purposes as I do not plan to make any changes and to recompile.

There are two Datum's that exist (actually there are hundreds like you say, but only two of interest for me). One is a NAD83(Conus) datum and the other is a NAD83(Hawaii) datum. The Nad83(Conus) datum is the one exposed in KnownCoordinateSystems and it is named UtmNad1983. All of the other projections in DotSpatial, except those named OldHawaiian, produce results that are identical with a fraction of a centimeter. OldHawaiian produces results that are hundreds of meters different.

However, using a NAD83(Hawaii) datum and comparing a NAD83(Conus) datum in other applications produces Northing and Easting coordinates that are different by approximately 50cm in both Easting and Northing. I have been unable to find the NAD83(Hawaii) datum in DotSpatial nor any datum that gives results that matches those obtained from other sources. My two other sources are a Trimble GPS R8 receiver, for one, and the application Geosoft Oasis/montaj for another.

So this is a request that the NAD83(Hawaii) datum be included in DotSpatial and exposed in KnownCoordinateSystems.