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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Hawaii GIS |
| Date: |
07/31/2002 03:19:24 PM |
| From: |
Mike Flannigan |
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It sounds very familiar. I noticed on a trip to Hawaii this year that
the entire GNIS database of features is off by the same, consistent,
~100 meters you notice. As I recall, features are really east of the
location given in GNIS. Not sure what the problem is, but I
suspect it is datum related. GNIS appears to be NAD27 for the
lower 48, but it's not well documented in my version.
Mike Flannigan
Thomas Harris wrote:
> Hi List:
> We are having some difficulty with out Hawaii GIS. I received USGS
> DRG's that are in UTM NAD27. Overlaying our Hawaii roads coverage
> reveals a uniform offset in the DRG data of over 100 meters. We have
> confidence in our road data because of field validation with GPS. I
> suspect that the problem is perhaps unique to Hawaii. Does this
> problem sound familiar to anyone working with Hawaii data?
> Thanks in advance,
> Thomas
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