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[aprssig] Need some Coordinate and math help

kb2scs at optonline.net kb2scs at optonline.net
Sun Mar 6 02:57:23 UTC 2005


Hi Tom
            Thank you for your help.
If you want to learn all about the DLG-O format then go to the 
following link.
http://rockyweb.cr.usgs.gov/nmpstds/dlgstds.html
And download the first part1,part2,part3 pdf files.
They explain the whole format. But they do not explain on how to 
change utm to lat and long.

The usgs has a viewer with source code. It is fortran. you will find 
it at.
http://mcmcweb.er.usgs.gov/drc/dlgv32pro/index.html

On 5 Mar 2005 at 17:43, Tom Russo wrote:

> On Sat, Mar 05, 2005 at 06:46:42PM -0500, we recorded a bogon-computron collision of the <kb2scs at optonline.net> flavor, containing:
> > Hi All
> >          I am presently working on a new mapping system that uses 
the 
> > USGS DLG 1000k optional format.
> > 
> > What I need is a mathematical formula to take the UTM coordinates 
in 
> > the DLG file and convert them to Lat and long.
> 
> Look at the open source proj4 library, which can do all of that and 
more, 
> and you don't have to code up your own math.  You can find it at
> http://www.remotesensing.org/  (look on the right, under "featured 
links")
> 
> I'm curious how you're reading the DLG-O format --- there seem to 
be no
> open-source DLG-O readers, and I have been unable to find any 
converters to
> more open formats that don't cost a couple hundred bucks.
> 
> -- 
> Tom Russo    KM5VY     SAR502  DM64ux         
http://www.swcp.com/~russo/
> Tijeras, NM  QRPL#1592 K2#398  SOC#236 AHTB#1 
>  "When life gives you lemons, find someone with a paper cut."
> 

Let us hope we never witness the "Silence Of The Hams"
73 DE John  KB2SCS
       E-Mail:            kb2scs at arrl.net
       APRS-SCS     http://www.tapr.org/~kb2scs
       Web Page:     http://www.qsl.net/kb2scs




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