> Yes, there is supposed to be map data from a WMS 
> at:http://sdmdataaccess.nrcs.usda.gov/Spatial/SDM.wms?

Still no idea what that is supposed to look like.
Your map actually asks for
   http://www.tchdgis.org/googlemaps/wms2kml.kml
and it's simple enough to put that into maps.google.com and see what
we get.
Not much it seems ...

You can also paste that url directly in your browser and see if the
xml looks sensible.
I can see things like
 <LatLonBox>
  <north>72</north>
  <south>18</south>
  <east>-66</east>
  <west>-178.5</west>
  </LatLonBox>
which covers about half the earth's surface, are you expecting that?

The actual overlay images url in your kml is things like
http://SDMDataAccess.nrcs.usda.gov/Spatial/SDM.wms?VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&WIDTH=1024&HEIGHT=1024&LAYERS=SurveyAreaPolyOutline&TRANSPARENT=TRUE&FORMAT=image/png

and if we paste that directly in a browser we get an error message,
not an image -
<ServiceException>Error getting BBOX and extent area from WMS request
string (shorthand BBOX filter). Value cannot be null. Parameter name:
input

Looks like the 'conversion' is duff and the map can't get an image to
overlay.

cheers, Ross K

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