——
A VOICE:
15
How cloce would your
numbers compare in. the air from those
that are measured on the ground at the
ground at the same time.
Hseve you tried
that aa a control?
How close are the
ground readings with the air readings at
the same time?
MR. CASSIDY:
determine the factors.
Thisis how we
We take a measure-
ment on the surface and then we fly above
it.
e
MR. EISENBUD:
It's ae close as
independent ground readings would be.
MR. LEVINE:
You might give the
figures where you have your aerial and your
ground readings at the came time.
MR. CASSIDY:
Yes, but thet is
actually how we did determine it.
There
416 a spread in data of snbout twenty per
cent.
The big problem of getting this
factor of measuring from the air is not
so much the inaccuracy of radiation data
but the inaccuracy of the altimeter.
Until we got that radar alti-
meter, we had gone all over the 10%..
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