Garmin GPS - Re: Can DEM2TOPO use USGS data from Seamless to show topo data below sealevel?

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Re: Can DEM2TOPO use USGS data from Seamless to show topo data below sealevel?

Happy Trails

2008-01-16, 4:33 am

On Wed, 16 Jan 2008 06:20:23 GMT, Gerry Snyder
<mesmerizerfan@gmail.com> wrote:

>With help from this group I have succeeded in making some topo maps for
>my Garmin Etrex, but now I have a problem.
>
>I will be going on a birding trip in the Salton Sea area of California,
>and wanted to generate a map. The process works, but there are no
>contour lines below an elevation of 0, which is where the interesting
>areas are.
>
>DEM2TOPO (v 2.9) has a setting for Sea level threshold, but setting it
>to a negative value does not extend the contours.
>
>Anyone have a suggestion for anything else to try, either in getting the
>data from Seamless or in running DEM2TOPO?

Gerry

If you cannot find another way to do it, and you can export/import
either .shp or .dxf files, email me your points and I'll email you
back a file of countour lines above 0, below 0, or any combination.

- Tom

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