BOARD02386

• Board Meeting Date: 3/8/1972
• Description: Agenda or Table of Contents, Minutes, Memos
• Board Meetings - Doc Type: Meeting

I

I have a pile of pictures here. I think
I'll skip some of them and hope we don't have
to skip lunch. These came from an aerial
flight last October. starting up north Fort
Collins. coming down over Horsetooth and Carter
reservoir. up the Big Thompson drainage system.
over Lake Estes. then up over Dillion reservoir.
the Moffat system. over several lakes in the
Denver area. up the South Platte. then on to
Leadville flying continuous photo coverage down
the Arkansas. then down over the Russell Lakes
and San Luis Lakes. out over the plains area.
over Cucharas reservoir, and waving back and
forth with our airplane along the Arkansas to
the Great Plains reservoirs and John Martin
reservoir. and finally terminating at Lamar.

I

Our photographs are over about an BOO-mile
flight line. and as I said, I will have some
examples of that. We used a photographic tech-
nique of which some of you may not be familiar.
Normally. if you go up with your camera with a
roll of Kodachrome or Ektachrome color film, if
you see a blue subject. you get a blue picture
on your film, if it is green. you get green. if
it is red. you get req on your film. (slide)
And there is a band of color out beyond the
red - we will call it the near infrared - which
normally doesn't register on color film. We
used a special type of color film here which is
infrared sensitive and will register in the
infrared band. It is particularly sensitive in
the blue band. so we put in a filter and mask
out the blue band. and we start to pick out the
false colors. Items that are green on the
ground will show up blue in the photo. Items
that have a red subject show up green in the
photo. We have a picture of the Federal Center
where many of the buildings which have red
gravel roofs will show up as green on this
photograph.

Infrared bands which we can't see with our
eyes, show up as red on this infrared film. Why

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