[Spice_discussion] RE: [Spice_announce] Geometry Engine

Mon, 24 Feb 2003 09:54:50 -0600

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All of the geometric events in that list seem to involve three bodies (i.e.
angular separation between body 1 and body 2, as seen from a spacecraft.) I
think it would be very convenient for particles and fields instruments to
have simple, 2 body events (e.g. range between spacecraft and planet body
center less than X or planetocentric latitude of spacecraft greater than Y.)

Frank

-----Original Message-----
From: Diane Conner [mailto:Diane.Conner@jpl.nasa.gov]
Sent: Friday, February 21, 2003 12:19 PM
To: spice@dcs04.jpl.nasa.gov
Subject: Fwd: [Spice_announce] Geometry Engine

>Date: Wed, 19 Feb 2003 09:00:33 -0800
>From: Lee Elson <Lee.Elson@jpl.nasa.gov>
>Subject: [Spice_announce] Geometry Engine
>Sender: spice_announce-admin@naif.jpl.nasa.gov
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>
>As part of an ongoing effort to increase the functionality of the 
>SPICE Toolkit, we at NAIF are planning the development of SPICELIB 
>routines that will allow the user to determine time windows or 
>"schedules" when certain geometric constraints are met. To make this 
>development process as efficient as possible, we'd like to determine 
>which geometric constraints would offer the most "bang for the buck" 
>in terms of useful functionality. Listed below are brief 
>descriptions of what we've come up with (in a loose arrangement of 
>decreasing priority):
>
>1)"Distance" -- determine time intervals during which the apparent 
>distance between 2 specified bodies, as viewed from a specified 
>observing body, satisfies a specified constraint (e.g. less than, 
>equal to, greater than, between values)
>
>2)"Phase"-- determine time intervals during which the apparent 
>observer-target-Sun angle satisfies a specified constraint.
>
>3)"Eclipse"-- determine time intervals during which one body is 
>eclipsed by another as viewed by an observer.
>
>4)"Occultation/transit"-- determine time intervals during which one 
>body is occulted/transited by another as viewed by an observer.
>
>5)"Time from periapsis/apoapsis"-- determine time intervals during 
>which a body in orbit is within a specified time interval from 
>periapsis/apoapsis.
>
>6)"Elevation"-- determine time intervals during which the elevation 
>of an object, in a specified reference frame, satisfies a specified 
>constraint.
>
>7)"Viewed Latitude/longitude"-- determine time intervals during 
>which a viewed location (latitude/longitude) satisfies a specified 
>constraint.
>
>8)"Nadir separation"-- determine time intervals during which the 
>angle between an observed object and the nadir direction satisfies a 
>specified constraint.
>
>9)"Separation"-- determine time intervals during which the angular 
>separation of 2 bodies (as seen by an observer) satisfies a 
>specified constraint.
>
>10)"Incidence/emission/solar longitude"-- determine time intervals 
>during which the incidence/emission/solar longitude angle satisfies 
>a specified constraint.
>
>11)"Orbital longitude"-- determine time intervals during which the 
>orbital longitude of an object, relative to an observer, satisfies a 
>specified constraint.
>
>12)"Angular velocity"-- determine time intervals during which the 
>angular velocity of one object relative to another satisfies a 
>specified constraint.
>
>13)"Apparent diameter"-- determine time intervals during which the 
>apparent diameter of a body satisfies a specified constraint.
>
>14)"Elongation"-- determine time intervals during which the 
>elongation (angular separation of a body from the sun) of a body 
>satisfies a specified constraint.
>
>15)"Relative velocity"-- determine time intervals during which the 
>velocity of one body relative to another satisfies a specified 
>constraint.
>
>16) "User supplied"-- determine time intervals during which a 
>function provided by the user satisfies a specified constraint.
>
>In addition to the time oriented "windows/schedules" discussed 
>above, it is possible (but more work) to have other solutions. An 
>example might be to find a range of viewed latitudes and longitudes 
>for a specified time window.
>
>The main purpose of this note is to solicit your input. Are the 16 
>constraints listed above of any use to you? Are there others that 
>would be more useful?
>
>Regards,
>Lee Elson
>Lee.Elson@jpl.nasa.gov
>818-354-4223
>
>
>
>_______________________________________________
>Spice_announce mailing list
>Spice_announce@naif.jpl.nasa.gov
>http://naif.jpl.nasa.gov/mailman/listinfo/spice_announce

-- 
Diane Conner
--------------------------------
1.818.354.8586 voice    1.818.393.4669 Fax       
SPICE:  https://cassini.jpl.nasa.gov/csos/io/spice/
SPICE FILES: ftp://naif.jpl.nasa.gov/pub/naif/CASSINI/kernels/
PDS Archive:  https://cassini.jpl.nasa.gov/pds_archive

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All of the geometric events in that list seem to =
involve three bodies (i.e. angular separation between body 1 and body =
2, as seen from a spacecraft.) I think it would be very convenient for =
particles and fields instruments to have simple, 2 body events (e.g. =
range between spacecraft and planet body center less than X or =
planetocentric latitude of spacecraft greater than Y.)

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>Frank</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Diane Conner [<A =
HREF=3D"mailto:Diane.Conner@jpl.nasa.gov">mailto:Diane.Conner@jpl.nasa.g=
ov</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Friday, February 21, 2003 12:19 PM</FONT>
<BR><FONT SIZE=3D2>To: spice@dcs04.jpl.nasa.gov</FONT>
<BR><FONT SIZE=3D2>Subject: Fwd: [Spice_announce] Geometry =
Engine</FONT>
</P>
<BR>

&gt;Date: Wed, 19 Feb 2003 09:00:33 -0800
 &gt;From: Lee Elson =
&lt;Lee.Elson@jpl.nasa.gov&gt;
 &gt;Subject: [Spice_announce] Geometry Engine
 &gt;Sender: =
spice_announce-admin@naif.jpl.nasa.gov
 &gt;To: spice_discussion@naif.jpl.nasa.gov, =
spice_announce@naif.jpl.nasa.gov
 &gt;X-Accept-Language: en-us, en
 &gt;X-BeenThere: =
spice_announce@naif.jpl.nasa.gov
 &gt;X-Mailman-Version: 2.0.13
 &gt;List-Post: &lt;<A =
HREF=3D"mailto:spice_announce@naif.jpl.nasa.gov">mailto:spice_announce@n=
aif.jpl.nasa.gov</A>&gt;
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ribe</A>&gt;
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FONT>
 &gt;List-Id: General SPICE announcements =
&lt;spice_announce.naif.jpl.nasa.gov&gt;
 &gt;
 &gt;As part of an ongoing effort to increase the =
functionality of the 
 &gt;SPICE Toolkit, we at NAIF are planning the =
development of SPICELIB 
 &gt;routines that will allow the user to determine =
time windows or 
 &gt;&quot;schedules&quot; when certain geometric =
constraints are met. To make this 
 &gt;development process as efficient as possible, =
we'd like to determine 
 &gt;which geometric constraints would offer the most =
&quot;bang for the buck&quot; 
 &gt;in terms of useful functionality. Listed below =
are brief 
 &gt;descriptions of what we've come up with (in a =
loose arrangement of 
 &gt;decreasing priority):
 &gt;
 &gt;1)&quot;Distance&quot; -- determine time =
intervals during which the apparent 
 &gt;distance between 2 specified bodies, as viewed =
from a specified 
 &gt;observing body, satisfies a specified constraint =
(e.g. less than, 
 &gt;equal to, greater than, between values)
 &gt;
 &gt;2)&quot;Phase&quot;-- determine time intervals =
during which the apparent 
 &gt;observer-target-Sun angle satisfies a specified =
constraint.
 &gt;
 &gt;3)&quot;Eclipse&quot;-- determine time intervals =
during which one body is 
 &gt;eclipsed by another as viewed by an =
observer.
 &gt;
 &gt;4)&quot;Occultation/transit&quot;-- determine =
time intervals during which one 
 &gt;body is occulted/transited by another as viewed =
by an observer.
 &gt;
 &gt;5)&quot;Time from periapsis/apoapsis&quot;-- =
determine time intervals during 
 &gt;which a body in orbit is within a specified time =
interval from 
 &gt;periapsis/apoapsis.
 &gt;
 &gt;6)&quot;Elevation&quot;-- determine time =
intervals during which the elevation 
 &gt;of an object, in a specified reference frame, =
satisfies a specified 
 &gt;constraint.
 &gt;
 &gt;7)&quot;Viewed Latitude/longitude&quot;-- =
determine time intervals during 
 &gt;which a viewed location (latitude/longitude) =
satisfies a specified 
 &gt;constraint.
 &gt;
 &gt;8)&quot;Nadir separation&quot;-- determine time =
intervals during which the 
 &gt;angle between an observed object and the nadir =
direction satisfies a 
 &gt;specified constraint.
 &gt;
 &gt;9)&quot;Separation&quot;-- determine time =
intervals during which the angular 
 &gt;separation of 2 bodies (as seen by an observer) =
satisfies a 
 &gt;specified constraint.
 &gt;
 &gt;10)&quot;Incidence/emission/solar =
longitude&quot;-- determine time intervals 
 &gt;during which the incidence/emission/solar =
longitude angle satisfies 
 &gt;a specified constraint.
 &gt;
 &gt;11)&quot;Orbital longitude&quot;-- determine =
time intervals during which the 
 &gt;orbital longitude of an object, relative to an =
observer, satisfies a 
 &gt;specified constraint.
 &gt;
 &gt;12)&quot;Angular velocity&quot;-- determine time =
intervals during which the 
 &gt;angular velocity of one object relative to =
another satisfies a 
 &gt;specified constraint.
 &gt;
 &gt;13)&quot;Apparent diameter&quot;-- determine =
time intervals during which the 
 &gt;apparent diameter of a body satisfies a =
specified constraint.
 &gt;
 &gt;14)&quot;Elongation&quot;-- determine time =
intervals during which the 
 &gt;elongation (angular separation of a body from =
the sun) of a body 
 &gt;satisfies a specified constraint.
 &gt;
 &gt;15)&quot;Relative velocity&quot;-- determine =
time intervals during which the 
 &gt;velocity of one body relative to another =
satisfies a specified 
 &gt;constraint.
 &gt;
 &gt;16) &quot;User supplied&quot;-- determine time =
intervals during which a 
 &gt;function provided by the user satisfies a =
specified constraint.
 &gt;
 &gt;In addition to the time oriented =
&quot;windows/schedules&quot; discussed 
 &gt;above, it is possible (but more work) to have =
other solutions. An 
 &gt;example might be to find a range of viewed =
latitudes and longitudes 
 &gt;for a specified time window.
 &gt;
 &gt;The main purpose of this note is to solicit your =
input. Are the 16 
 &gt;constraints listed above of any use to you? Are =
there others that 
 &gt;would be more useful?
 &gt;
 &gt;Regards,
 &gt;Lee Elson
 &gt;Lee.Elson@jpl.nasa.gov
 &gt;818-354-4223
 &gt;
 &gt;
 &gt;
 &gt;_______________________________________________
 &gt;Spice_announce mailing list
 &gt;Spice_announce@naif.jpl.nasa.gov
 &gt;<A =
HREF=3D"http://naif.jpl.nasa.gov/mailman/listinfo/spice_announce" =
TARGET=3D"_blank">http://naif.jpl.nasa.gov/mailman/listinfo/spice_announ=
ce</A>

<P><FONT SIZE=3D2>-- </FONT>
<BR><FONT SIZE=3D2>Diane Conner</FONT>
<BR><FONT SIZE=3D2>--------------------------------</FONT>
<BR><FONT SIZE=3D2>1.818.354.8586 voice&nbsp;&nbsp;&nbsp; =
1.818.393.4669 Fax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=3D2>SPICE:&nbsp; <A =
HREF=3D"https://cassini.jpl.nasa.gov/csos/io/spice/" =
TARGET=3D"_blank">https://cassini.jpl.nasa.gov/csos/io/spice/</A></FONT>=

<BR><FONT SIZE=3D2>SPICE FILES: <A =
HREF=3D"ftp://naif.jpl.nasa.gov/pub/naif/CASSINI/kernels/" =
TARGET=3D"_blank">ftp://naif.jpl.nasa.gov/pub/naif/CASSINI/kernels/</A><=
/FONT>
<BR><FONT SIZE=3D2>PDS Archive:&nbsp; <A =
HREF=3D"https://cassini.jpl.nasa.gov/pds_archive" =
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