--- Begin Forwarded Message ---
Date: Thu, 25 Mar 1999 15:44:12 -0500
From: ahudson <[log in to unmask]>
Subject: Re: How to obtain Coordinates from a topographical map <fwd>
Sender: ahudson <[log in to unmask]>
 
 
Getting a close reading is fairly simple. Between the corner reading and the
next lat/long reading on any topo are five 30" units. These vary in size
slightly moving north and south due to curvature, so for widely varying
locations you cant make a template. In your case, you probably can make a
cardboard or plastic template, use the back of a ruler perhaps--marking ove five
units, perhaps using the lengths of long and lat on the topo nearest the center
of your cemetery group. The template for the e-w and n-s readings will be
different. In other words keep it simple, count in 30" units from the corners,
and you should be more than adequately close in your home-made readings. Buying
fancy tools to help you will be a waste of time and money. Take any topo and try
this, before you are out in the field or on deadline, and play with it. I think
you will find it works.
 
Alice Hudson
Map Division, NYPL
______________________________ Reply Separator _________________________________
Subject: How to obtain Coordinates from a topographical map <fwd>
Author:  Johnnie Sutherland <[log in to unmask]> at Internet
Date:    3/25/99 2:23 PM
 
 
--- Begin Forwarded Message ---
Date: Wed, 24 Mar 1999 16:45:20 -0500
From: "William A. Davis" <[log in to unmask]>
Subject: How to obtain Coordinates from a topographical map
Sender: "William A. Davis" <[log in to unmask]>
 
 
 
Maybe I can get some advice on this list.  I am not a map professional by
any means.    I am interested in preserving the location of the many little
family cemeteries that are found throughout Carroll County, KY and other
locations.
 
I was thinking that one way to do this was to record the latitude and
longitude coordinates for each cemetery.   I don't know much about latitude
and longitude except that it tells you where a particular location is.
 
I may someday obtain a GPS device and get the readings at each cemetery,
but for the moment I am wondering how I can obtain a credible approximate
reading by cross-referencing  the numbers along the borders of a USGS
topographical map?
 
I have a topographical map upon which I have marked many of these locations
and would like to convert them into latitude and longitude numbers.
 
I can't tell how to do this just by looking at the map itself.  Could
someone give me some direction?   Could there be any online map server that
I would find helpful?
 
The topographical map does have some cemeteries indicated already, but you
couldn't find them in a web server,  I guess because they are not named.
Have I missed a way to get the server to give the coordinates for these
unnamed cemeteries?
 
And a third question:  Is the USGS still taking information to update their
maps?  And are they incorporating them into new maps or servers?  I thought
I had heard budget cuts were shutting down the production of further maps.
If I still can I'd like to name this maps and get them into the system.
Would they still take the information on a cemetery that's no longer visable?
 
Any thoughts appreciated,
 
 
 
Bill Davis
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