Older DEM files

[cnwfan]

I don't generally ask questions however I am looking to back date my DEM data 1/3rd to pre 2009 around the Boone Iowa area for the Kate Shelley, but having not any luck with dates that pre date the new bridge that went in Aug of 2009. When I originally did data the data was from seamless site and I think it was 1983, still a little dated data then. Any help in the quest is greatly needed ! New Data has the new bridge in place.

[eric]

I can check my archive -- at one point I had the CNW across Iowa saved for DEM and markers.

Any specific file name?

[cnwfan]

Thanks , I think I found something that works but just the same would like to see what you got one. The one I found works but it still has the ROW of the Ft dodge. That has been cut down grade wise east of yard at Boone. Doesn't matter on file name.

[eric]

Unfortunately, I have a collection of a couple hundred zip files and no idea what's in each of them. It's not as with the HGT files with lat and long in the filename... you have to grab it from a text file buried in the zip.

It might be easier for you to just manually adjust the terrain where you need to by raising it with the track piece or flattening it.


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[cnwfan]

Interesting enough I found a archive of sorts here https://portal.opentopography.org/da....012021.4269.1 That has what I needed I just spliced the new version on a new route grabbed the tiles and transferred. Now I have the old terrain as it was pre new bridge . Not sure how old the file is with the system they used. USGS_13_n42w095_20100929 assuming 2010?