USGS DLG files

[Gerald I. Evenden]

>From: KLENKUS1 at VAXC.STEVENS-TECH.EDU
>Date: Thu, 19 May 1994 12:42:06 -0400 (EDT)
>Subject: USGS DLG files
>Precedence: Bulk
>To: grassu-list at max.cecer.army.mil
>
>Ive loaded down the files from the USGS for new jersey
>from edcftp.cr.usgs.gov.  They load up fine to grass
>but Im a little confused as to the coordinate 
>system. The readme file states that it is a ground
>planimetric corrdiate system measured in feet.
>
>Is this  UTM, state planer,  or what?
>
>For an area in the newark-e_NJ map I get x,y's with
>542662.61 4537522.04.
>
>any help would be appreciated
>
>kym lenkus
>davidson laboratory

This is a stinker.  Using -74d10'w 40d44'n as a location for Newark
I get UTM, zone 18 coordinates for NAD83 of:

570366.69  4509489.15 (meters)

or 

570368.57  4509277.73 (meters)

for NAD27.  Neither looks very close.

Using New Jersey State Plane (NAD83):

8943953.57      5062476.70 (us-ft)

or

8902848.13      5062434.63 (us-ft)

NAD27.  Even less close.

But given no other information or better test coordinates, I
would have to assume that the data is in UTM, zone 18, and in meters.
Datum unknown.

Gerald (Jerry) I. Evenden   Internet: gie at charon.er.usgs.gov
voice: (508)563-6766          Postal: P.O. Box 1027
  fax: (508)457-2310                  N.Falmouth, MA 02556-1027