See the following works by the USGS:

 

Publication: https://pubs.er.usgs.gov/publication/sir20125167

 

Available Data - http://topotools.cr.usgs.gov/

 

Michael Page

Geographer, Emory Center for Digital Scholarship

Lecturer of Geospatial Sciences & Technology, Dept. of Environmental Sciences

Emory University

Atlanta, Georgia USA

Skype: cartographic

Tel 404.548.7210

 

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-------- Original message --------
From: David Hodnefield <[log in to unmask]>
Date: 10/19/16 11:30 (GMT-07:00)
To: [log in to unmask]
Subject: Re: 4 ft contour maps?

Many cities and counties have had their own topo and planimetric maps made.  I have frequently seen contour levels down to one or two feet on the old ones.  In Minnesota, the maps are frequently done as ½, ¼, or 1/8 section.  Those are old fashioned now, as the up to date cities are working with Lidar data.

 

   Description: cid:image001.png@01CD70F3.D84978F0   limiting liability with relevant environmental research

 

David Hodnefield, President

Historical Information Gatherers

 

[log in to unmask]

952-253-2004 ext 111

www.historicalinfo.com

 

From: Maps-L: Map Librarians, etc. [mailto:[log in to unmask]] On Behalf Of Angela R Cope
Sent: Wednesday, October 19, 2016 11:42 AM
To: [log in to unmask]
Subject: 4 ft contour maps?

 

 

 

From: Diaz, Tony A. <[log in to unmask]>
Sent: Wednesday, October 19, 2016 11:21 AM
To: 'Maps-L: Map Librarians, etc.'
Subject: 4 ft contour maps?

 

Does anyone know of local topo maps with 4 ft contour intervals? Specifically, I'm looking for info on the area within the Cucamonga Peak (CA) 7.5' Quad. I came across an uncited reference to such a map, but I can't find anything. 

 

Tony Diaz

caltech