Question about Datum

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Topic: Question about Datum (Read 907 times)

NeuroDoc

Jr. Member

Posts: 21

Question about Datum

« on: October 04, 2008, 12:04:18 PM »

I am working on combing and compiling the data for a WA state map. I have been following the tutorial religiously, but I can't figure out the Datum.

What datum does all of this data use? I have assumed, that since it is coming straight from the source, that it is using NAD83, is that correct? If not, then I would have to tell my GPSr what datum to use, correct?

Thanks.


« Last Edit: October 04, 2008, 12:06:13 PM by Neurodoc »	Logged

-Oz-

Map Maker!
Administrator
Hero Member

Posts: 1081

Re: Question about Datum

« Reply #1 on: October 04, 2008, 05:06:09 PM »

Which program are you using? Global Mapper and GPSMapEdit handle datums differently.


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Dan Blomberg
Administrator - GPSFileDepot
GPS Units: Garmin Dakota 20, Garmin GPSMap 60csx, Nuvi 255W, Nuvi 250W

NeuroDoc

Jr. Member

Posts: 21

Re: Question about Datum

« Reply #2 on: October 04, 2008, 06:27:37 PM »

I've been using Global Mapper.


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-Oz-

Map Maker!
Administrator
Hero Member

Posts: 1081

Re: Question about Datum

« Reply #3 on: October 04, 2008, 07:21:30 PM »

Most of the data is in nad83/wgs84 but some of it (as you know) is in nad27. Then there are places like hawaii that use their own datum.

Most files include metadata of some sort that will tell you the datum. If you have questions about specific files let know.


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Dan Blomberg
Administrator - GPSFileDepot
GPS Units: Garmin Dakota 20, Garmin GPSMap 60csx, Nuvi 255W, Nuvi 250W

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