Message-ID: <4Zh13Mi00VcJE46k4p@andrew.cmu.edu>
Reply-To: space+@Andrew.CMU.EDU
From: space-request+@Andrew.CMU.EDU
To: space+@Andrew.CMU.EDU
Date: Wed, 17 Jan 90 01:29:45 -0500 (EST)
Subject: SPACE Digest V10 #434

SPACE Digest                                     Volume 10 : Issue 434

Today's Topics:
			Re: booster pollution
		       Re: Digital terrain data
		    Re: Voyager Update - 01/16/90
			Re: booster pollution
			Re: booster pollution
----------------------------------------------------------------------

Date: 16 Jan 90 21:16:16 GMT
From: vsi1!v7fs1!mvp@apple.com  (Mike Van Pelt)
Subject: Re: booster pollution

In article <19846@watdragon.waterloo.edu> jdnicoll@watyew.waterloo.edu (Brian or James) writes:
>SF authors use nuclear drives in atmosphers with cheerful abandon.

I recall a Larry Niven story, where a fusion-drive ship is conveyed to
orbit by a thruster that was "... air compressed almost to degenerate
matter.  Using a fusion drive in the Earth's atmosphere was good for a
one-way trip to the Organ Banks -- in pieces."
-- 
Mike Van Pelt           I would like to electrocute everyone who uses the 
Headland Technology     word 'fair' in connection with income tax policies.
(was: Video Seven)                   -- William F. Buckley
...ames!vsi1!v7fs1!mvp

------------------------------

Date: 15 Jan 90 22:27:21 GMT
From: spectra!bseeg@nosc.mil  (Bob Seegmiller)
Subject: Re: Digital terrain data

In article <1375@uvm-gen.UUCP> haviland@emily.uvm.edu (tom haviland) writes:
>
>  I couldn't decide what newsgroup to post this in...graphics and space seem
>to be the closest approximation (why isn't there a geography newsgroup?).
>
>  I'm interested in 3-d terrain modelling and I'd like to be able to display
>images of the terrain in different real areas.  Is there any place where one
>can get digitized elevation data for various areas of the country (US)?
>I tried writing the USGS, but all they sent me was info on topographics maps.
>
>Any help would be greatly appreciated...

rather a surprise, that USGS would just send you info on topos, as they
have quite a collection of digital elevation maps (DEMs) covering the
country in both 7.5 second quadrangles and 1 degree DMA (Defense Mapping
Agency) data sources.  Comes on mag tapes.  Ask for their USGeoData
information.  Some areas include demographic data, as well.  And they do
send you some very pretty renderings using ERTS images over the
elevations in their brochure.  Don't know how much it costs, but they'll
tell you.  Both USGS in Reston, Va. and Palo Alto, Ca. should be able to
help.  Sorry I don't have addresses on hand, but they do advertise this
product in _Computer Graphics World (Today?)_ trade magazine (the big
glossy newspaper-sized one).
-- 
/----------------------------------------+-------------------------------------\
| Bob Seegmiller <The usual disclaimer>  | Spectragraphics Corp.               |
| "Till human voices wake us..." - Eliot | .....................               |
| UUCP: ...!nosc!spectra!bseeg           | Sandy Eggo, CA ......               |

------------------------------

Date: 16 Jan 90 23:58:20 GMT
From: usc!cs.utexas.edu!jarvis.csri.toronto.edu!csri.toronto.edu!wayne@apple.com  (Wayne Hayes)
Subject: Re: Voyager Update - 01/16/90

In article <2582@jato.Jpl.Nasa.Gov>
baalke@mars.jpl.nasa.gov (Ron Baalke) writes:
>
>                             Voyager 1
> 
> A TLC test was performed on 1/1 and the X-band TWT
    ^^^
This can't be what I think it is, can it?  A "Tender Loving Care" test?
"You OK, darling?  Comfy-cosy, warm, honey-buns?"

>observation  of omicron Andromedae on 1/3 and playback of  Uranus
>photometric images on 1/4-5 were lost due to the continuing  non-

When did Voyager ONE get images of Uranus?  Or can it actually get useful
info from half way across the solar system?  (Well, ok not half way, but at
least a few A.U.'s away.)


-- 
The 'C' programming language is, at worst, the second best language for any
given application.  Usually, however, it is the best.  --  anon

Wayne Hayes	INTERNET: wayne@csri.toronto.edu	CompuServe: 72401,3525

------------------------------

Date: 16 Jan 90 17:10:15 GMT
From: pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!jarvis.csri.toronto.edu!utgpu!watserv1!watdragon!watyew!jdnicoll@tut.cis.ohio-state.edu  (Brian or James)
Subject: Re: booster pollution


 As well as the chlorine problem, I remember some concern about possible
side effects of NOx compounds produced by the boosters. I understand that
the exhaust of a (for example) hydrogen-oxygen fueled booster would be
primarily H2O, but would there be significant amounts of other compounds
produced, either from incomplete combustion of the fuel, or from chemical
reations caused by the admittedly transient presence of the several thousand
degree exhaust? Again, from my rather dim memory, I recall that there were
reports of large, temporary holes forming in the ozone layer. Since I
that Orion was designed in (Pre-atmospheric test ban), these extra cancer
deaths were felt to be acceptable (and probably difficult, if not flat
m possible to detect against the normal cancer death rate.). Maybe
France can use Orion:) . SF authors use nuclear drives in atmosphers with
cheerful abandon. I recall reading one were the viewpoint character says
something like "OK, we're over the 'burbs. Switch to photon drive." I
suspect the author has -no- idea just how much energy the 'thinly
populated' suburbs were about to receive. (As yet another aside,
would there have been any EMP side effects from Orion?)
							James Nicoll

------------------------------

Date: 16 Jan 90 10:14:01 GMT
From: mcsun!ukc!icdoc!syma!andy@uunet.uu.net  (Andy Clews)
Subject: Re: booster pollution

From article <1990Jan15.164939.29641@utzoo.uucp>, by henry@utzoo.uucp (Henry Spencer):
> The main problem is that solid rockets put out all kinds of garbage, some
> of it with enough chlorine content to possibly be an ozone issue.

I read in the UK-based "Green Magazine" that every Shuttle launch causes
the eventual destruction of 1 million tonnes of atmospheric ozone due to
the chlorine compounds in the SRBs. Can anyone confirm or (hopefully)
deny this?

-- 
Andy Clews, Computing Service, Univ. of Sussex, Brighton BN1 9QN, ENGLAND
JANET: andy@syma.sussex.ac.uk   BITNET: andy%syma.sussex.ac.uk@uk.ac
Voice: +44 273 606755 ext.2129

------------------------------

End of SPACE Digest V10 #434
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