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<DIV>In a message dated 9/14/2006 11:41:16 PM Mountain Standard Time,
r.keam@auckland.ac.nz writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>The
postings on this matter lead me to ask: Does a very detailed map <BR>of
the locations of the springs on Geyser Hill, and indeed the whole <BR>area
back to OF Lodge exist? (I have a recollection of being told <BR>that
this was the case during a very early conversation I had with <BR>Scott
Bryan.)</FONT></BLOCKQUOTE>
<DIV>
<DIV>Depending on the definition of "very detailed," the maps produced by the
USGS (commonly known as the "Thermal Maps") during the 1960s and to some extent
updated (or at least, added to) during the early 1970s are available. The scale
is 1 inch = 200 feet. These maps exist for the entire Upper Geyser
Basin (also for Norris Geyser Basin and West Thumb Geyser Basin, and for
portions of the Midway Geyser Basin and Lower Geyser Basin (plus other areas
such as Mud Volcano). Duplicated from the copies that were given to me as a
personal gift by Dr. Donald E. White circa 1980, these maps are now
available from the GosaStore.</DIV></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>
If so, and if also a reasonably accurate location for <BR>the camera is known,
then it ought to be possible quite readily to <BR>determine the direction of
the line-of-sight to the steam cloud that <BR>appears to show something
erupting. If the line-of-sight intersects <BR>the location of a thermal
spring, then this becomes a prime candidate <BR>for the source of the
cloud.</FONT></BLOCKQUOTE>
<DIV></DIV>
<DIV>For the NPS, we have been working on doing exactly this. Not only for
directly visible features, but also for those steam clouds that rise from behind
the tree-covered ridge. And as previously pointed out, wind or fog or
intervening steam clouds and etc. can lead one astray.</DIV>
<DIV> </DIV>
<DIV>Scott Bryan</DIV></FONT></BODY></HTML>