<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=US-ASCII"> <META content="MSHTML 6.00.6000.16762" name=GENERATOR></HEAD> <BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial" bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=role_document face=Arial color=#000000 size=2> <DIV>The coordinates used in Marler's Inventory for locating thermal features were devised by the USGS for their post-15 earthquake mapping in the 1960s and early 1970s. the system consists of a grid of squares that measure 1000 feet east-west and 1000 feet north-south. The northermost tier of these squares is row "A", and these are numbered from west to east -- A1, A2, A3, etc.</DIV> <DIV> </DIV> <DIV>The next tier to the south is (logically, I trust) B, then C, etc.</DIV> <DIV> </DIV> <DIV>Within any one of these squares -- say for example H8, a thermal feature is located by measuring eastward, then southward from the northwest corner of the square. So, Daisy Geyser is located in grid square H8, 280 feet east and 55 feet south of the northwest corner of H8. </DIV> <DIV> </DIV> <DIV>I do not know -- does anybody ? -- just why the apparent origins were chosen where they were, since for example the Upper Basin's A1 is way up on the plateau northwest of Biscuit Basin. I'm sure the USGS had established survey points out there somewhere, but if any exist now, I don't know where they are.</DIV> <DIV> </DIV> <DIV>Anyhow, this was done for each of the geyser basins -- Upper, Midway, Lower, Norris, West Thumb, and Shoshone (they didn't do Heart Lake or Gibbon) -- as well as Mud Volcano and Mammoth. These grids are shown on the Thermal Maps just discussed on this list in the last couple of days.</DIV> <DIV> </DIV> <DIV>Scott Bryan</DIV> <DIV>-----------</DIV> <DIV> </DIV> <DIV> <DIV>In a message dated 12/15/2008 7:29:17 P.M. US Mountain Standard Time, jack.ashe@yahoo.com writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT style="BACKGROUND-COLOR: transparent" face="Times New Roman" color=#000000 size=2> <DIV>Apologies if this has been discussed before. I am new to this list so I  searched the archives 2 years but could not find a match for this issue.</DIV> <DIV>I have been reading Marler's Inventory  (from early 70's) and he uses a unique method for defining the location of thermal features that may have been placed on an unpublished USGS map according to the introduction in the GOSA materials  It seems that his inventory is more complete than the Research Coordination Network.   Is there a method to convert his system to something more traditional  (lat-long or UTM)? This would presumably be a spread sheet or a formula for making the conversion or at least a list of the reference points he used.</DIV> <DIV>Jacques Ashe</DIV> <DIV>Helena, Montana</DIV></FONT></BLOCKQUOTE></DIV></FONT><BR><BR><BR><DIV CLASS="aol_ad_footer" ID="6882df769eff32842f5bae171deaeafd"><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Make your life easier with all your friends, email, and favorite sites in one place. <a href="http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000010">Try it now</a>.</FONT></DIV></BODY></HTML>