[Top] [All Lists]

Re: ANWR (now coordinates)

Subject: Re: ANWR (now coordinates)
From: "Greg Weddig" <>
Date: Mon, 20 Jun 2005 16:06:31 -0000
I don't like to carry extra gear (i.e. gps) with me when I record (as
you know Dan, I carry enough weight with my standard system).  So I
log the GPS coordinates when I get home with Topo USA.  

I purchased the USGS overlay for the program (for northern cal) that
shows the actual USGS 7.5 quad at certain levels of zoom.  When I am
recording somewhere I have a map for (like a national park) I will
mark the disc and track number on the paper map to remind myself where
I was, then I find the DMS coordinates (hours, min, sec) and altitude
when I get home.  If possible I usually also describe the area and
direction I was recording in.

All this is dropped into my database.  It's close enough for my
purposes.  Presumably if I want to convert the location to a different
format (imperial to decimal) it just a matter of a new formula in my


--- In  Dan Dugan <> wrote:
> Bill Rainey, thanks for your reply:
> >The other parameter you want to report to the park is the map
> >datum you used. U.S. Topo maps are still commonly NAD 27
> >CONUS (North American Datum ...Continental United States). My
> >impression is at least GPS units sold in the US default to
> >another datum (WGS 84), altho you can set them to convert
> >screen output to NAD27 CONUS or many others.
> Huh. A different reference point? They've moved Greenwich, or 
> something? How far off are you in the wrong system?
> >Consumer GPS units can sometimes produce startlingly bad
> >short term fixes, so a reality check via map software (e.g.,
> >National Geographic's Topo or several others) at the position
> >you are about to report is usually educational.
> I have TOPO, and plan to hook up a GPS to it. I'm looking for one 
> that's compatible with the Mac (USB) so I don't have to use a
> port dongle thing.
> >The dominant GIS software parks use to map location data
> >'expects' decimal degrees as input, though conversion is not a
> >big deal (assuming the datum is known).
> Thanks!
> -Dan


<Prev in Thread] Current Thread [Next in Thread>
  • Re: ANWR (now coordinates), Greg Weddig <=

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU