(r13) JmmcAsproProjectConception < Jmmc/Software

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---+ Conventions

   * All angles or coordinates are stored internally in *radians*
   * All angles or coordinates mostly are presented to the user in *degrees* (sexagesimal format for coordinates, degrees for distances)
   * double must be used as storage 
   * dates: use ISO8601 format as external format for presentation, Julian days as internal format.

---+ Use cases

JmmcAsproProjectPlots : sample plots

---++ Observability of a source (or list of sources) for a given interferometer

|Inputs| User format | internal format |
|Star name | anything  |  |
|Star coordinate | retrieved from NAME with Simabd, or entered by user (Ra,Dec only?) | RAJ2000,DEJ2000 |
|Observing site location | selection of one supported observatory | [[http://jmmc.fr/~upsa/oischema/http___www.jmmc.fr_aspro-oi_0.1/complexType/InterferometerDescription.html][observatory reference]] |
|Date of observation ( or period of time )|like DDMMYYYYHHMM| (Modified) Julian Day ( precise up to the second )|

Plot outputs:
TODO : How to represent the observability of a list of star onto multi-telescope? The observability of star is a series of time intervals where the star is visible from a location at a given date. This serie is telescope/station dependent (since there may be different horizons). Time intervals are segments of a time-line, at each point of which can be attached a list of properties: azimuth, elevation, airmass, atmospheric refraction, distance from sun, moon or another object (down to binary orbits!). The grouping into segments is meaningful. For mult-telescope observability, the observability is the intersection of all observabilities.


---+++ Is the source visible in the sky ?
---++++ Is the source over the horizon ?
|outputs|Internal/User| Format |
| celestial coordinates | Internal | HA / delta ??  units TBC TBD |
| over the horizon | User | boolean |

---++++ What is the AirMass value ?
GD note: below: nothing to do with airmass. airmass is just proportional to zeta, where zeta is the zenital angle (or more complicated formula if spherical atmosphere). Humidity x airmass give optical absorption. Seeing is proportinal to airmass (TBC).
|Inputs| User format | internal format |
| Seeing | choice or value ? | TBD |
| Humidity / Temperature... | choice or value ? | TBD |

|outputs|Internal/User| Format |
| AirMass | User | double |

What is the best method to get the airmass value?

---++++ Where are the sun / moon  ? 
|Inputs| User format | internal format |
| twilight constraints | angle degrees <br/> GM: est-ce que ASTRO/NAVAL/CIVIL sont des valeurs discrites qui parlent ? | double radians |

|outputs|Internal/User| Format |
| sunrise sunset moonrise moonset moonphase moonIllumination | User | DateTime couples |

Est-ce qu'il faut gerer d'autre planetes sources lumineuses ???
Quelles doit etre la precision pour les ephemerides? 

---++++ Is the star still visible given to a shadowing ???
|Inputs| User format | internal format |
| environment shadowing ( telescopes, mountains, building ....)| angle d'obstruction ( de 0 a 90 degres) en fonction de l'azimuth (repere a definir) | couples of Altitude / Azimuth points ( pointer ver la specification (a faire) ) |
| telescope(s) min elevation | angle degree | angle radians |




|outputs|Internal/User| Format |
|  |  |  |


---+++ What is the formulae of the observability given to the whole previous results?
A-t'on besoin de calculer l'AirMass par station? <span class="red">NON</span>
Est-ce que la voute celeste est la meme pour toutes les stations a un meme moment? <span class="red">NON a cause de l'horizon</span>

S'arrete-ton des le premier critere mauvais ou doit on faire un bilan de pertes...( par ex: une mauvaise airmass compensee par un configuration optique avec moins de pertes) <span class="red">Qu"entends-tu par "s'arrêter?"</span>

Comment gere-t'on l'observalité d'une liste d'etoiles? 
Est simplement la juxtaposition des resultats independants ou y-a t'il des contraintes de gestion par groupe? <span class="lime">Prévoir une gestion par groupe, sans l'approfondir. Laisser la liaison entre les membres d'un groupe possible comme dans un dessin où on groupe des éléments graphiques, sans plus.</span>


---++ Modelling of a source from a given interferometer
TBD

---+ Various informations
---++ Station Coordinates
The software handles station coordinates as described in the OIFITS (see OI_ARRAY table description).
The software accepts only the OIFITS values. All conversions to OIFITS values must be done externally.
---+++ VLTI configuration
Eso defines the coordinates in an proprietary maner. The right way to get the right informations is to read the data from an AMBER oifits ( may be generated by ASPRO ).

---+++ CHARA configuration
Chara expresses the station coordinates in the same format as OIFITS. Use ASPRO values.

---++ Java astronomy libraries
[[http://www.dartmouth.edu/~physics/faculty/skycalc/flyer.html][JSkyCalc = Java version of skycalc]]<br/>
[[http://mhuss.com/AstroLib.html][AstroLib]]<br/>
[[(URL to be defined)][PAL projet astrogrid (utilisé par APES et topcat)]]

Verifier : conversion coordonnees et ephemeride (au moins soleil et lune)

---++ Various libraries
   * [[http://jas.freehep.org/jas3/][Java Analysis studio 3]] : advanced plot library (svg support)
   * [[http://svgkit.sourceforge.net/][SvgKit]] : svg generation from javascript
   * [[http://www.epic.noaa.gov/java/sgt/][SGT]] : Scientific Graphics Toolkit
   * [[http://www.jfree.org/jfreechart/][JFreeChart 1.0]] : free 100% Java chart library (svg, pdf)
   * [[http://sites.google.com/site/piotrwendykier/][Page perso pour des applications numeriques fft matrices....]]

---++ Various documentation
   * [[http://www.strw.leidenuniv.nl/~mathar/public/matharMIDI20051110.pdf][MIDI Optical Path Differences and Phases]]


S'il faut developper une librairie graphique: http://www.siggraph.org/education/materials/HyperVis/percept/visrules.htm


---+ Main ASPRO functionnalities compared to alternates tools 
   * [[http://obswww.unige.ch/~segransa/apes/usermanual.html][APES]]


---++ Observability plot
   In contrary to APES, ASPRO is not a planetarium (planetarium: has animations/colors, and tries to mimic precisely the visual aspect of the sky).<br/>
   The main information consist in the observability timestamps of a target of a list of targets i.e. a simple list of time intervals could be enough (like the observation scheduler).<br/>
   However, beyond this minimal view the user should have details in a pop up or a contextual window (target rise/set, elevation).<br/>
   The user could add / remove / hide a target that is present in the plot
   
---++ UV coverage plot
   Use the Model Fitting GUI to define & display model parameters and associate a model per target instead of a single model for the current version of ASPRO.<br/>
   This plot should be displayed when a target is selected on the Observability plot.
   The UV tracks are ellipse segments. They have the same properties as for the observability time-line: each point can be tagged with an number of properties (in fact, all the properties of OI_VIS and OI_VIS2). Some properties associate 3 telescopes (OI_T3), and thus 3 uv tracks. Leave a possibility to associate more than 3 telescopes (intensity closure associates 4).
   
---++ Other items 
   * APES 'Select a baseline' widget has an interesting interferometer representation but it's less important. An expert mode without any configuration constraints seems a good idea
   * APES Paf files are specific to the PRIMA instrument and can not be reused. Only Observing blocks (OB) should be considered for ASPRO. See OBX example file: [[%ATTACHURL%/CAL-lam_gru_PCN_MRK23.obx][CAL-lam_gru_PCN_MRK23.obx]] (this is a typical parameter file for preparing observations with AMBER/VLTI). 
   * VMT is focused on a target model and has no observability feature
   * Dealing with aspro setting files is an important feature to keep the user session / history
   * Investigate plotting libraries that provide plot interactivity (batik supports svg format with javascript support ...) 
   1. refresh plot with new data when the user changes anything in widgets 
   2. interactive plot : the user can click on the plot to get information (predefined) or run other widgets
Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
obx	CAL-lam_gru_PCN_MRK23.obx	r1	manage	1.5 K	2009-10-06 - 08:08	GillesDuvert	this is a typical parameter file for pereparing observations with AMBER/VLTI
Topic revision: r13 - 2009-10-26 - LaurentBourges