[gdal-dev] Working with USGS NED data

[Stephen Woodbridge]

Hi all,

I plan to download the USGS NED 1/3 arcsec dataset and I noticed it is 
available in 2 formats: ArcGrid and GridFloat

Is one easier, faster, smaller, etc to work with than the other?

My goal is to augment the Tiger road network with Z elevation data.

I'm wondering if there is a tool that already does this, like read a 
shapefile, augment with elevation and write a new shapefile. Or if I 
would need to write a tools that does that. Can postgis be used to do this?

Given a lat,lon, what is the fastest way to get the elevation?

Thank you for any input you can provide.

-Steve