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What is desired for Public Online Meteor Database - Expected usage model - What are necessary for us - What embarrass us - Social issue agreements - Technical.

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Presentation on theme: "What is desired for Public Online Meteor Database - Expected usage model - What are necessary for us - What embarrass us - Social issue agreements - Technical."— Presentation transcript:

1 What is desired for Public Online Meteor Database - Expected usage model - What are necessary for us - What embarrass us - Social issue agreements - Technical problems and suggestions - Necessary application interface - UFO series for VMO

2 Expected Usage Model

3 What we will do first We would like to focus on the observation DB, and make it replace our CSV hub. This part has comparatively fewer problems, can be established now.

4 What are necessary for us Essentials - Application interface upload/update/delete/download of observations - Social issue agreement copyright/privacy/registration - Data scheme that enables above Seems not so difficult …..

5 What embarrass us, now VMO data definitions seems having a lot of problems for real use, yet. ex.1 cam_session_code does not exist on XML It should be most important access key to DB. It should be able to decide objectively. How can I update the observations? Unless this, even adding a link seems very difficult. ex2. meteor_code CAM_YYYYMMDD-N_SYSTEM_Mnnn this force difficult handling when the last night observations begun in a same UTC day. ex3. why orbit contains only height but not long/lat ? Can we download orbits that happened near Japan? …. Refer problem list for other points. They are many. VMO registration seems not open to non-IMO members. VMO seems violating the Japanese privacy law. …… It is necessary to clear off all points !

6 Social issue agreements - Observers must not assert copyrights or other rights about numerical data. - Copyright of visual media in DB is basically held by the observer. VMO does not concern it. It should be treated by the law of each observer ’ s country. - Users must provide true name or traceable Email address that will be published by DB. Other private information is optional. All registered information will be published. - Users must provide precise information of systems and the location of the stations in required accuracy. - Users can use encrypted format for precise longitude and latitude of the station. In this case, 0.01 degree rounded readable value should be added. (ex. 139.66 [cniweISPjl24] ). Decryption procedure will be distributed under special agreement. 1) Authorized people must keep the procedure in secret. 2) Program must not show or output precise location in human readable format. - Registration of DB does not mean participation to any organization.  VMO prepares own code registration page (observer, system … )

7 Encryption Purpose : Just hide precise value from public eyes. Sample : Simple secret key encryption, using bit exchange and EOR.

8 Technical problems and suggestions (comment for WGN38-1 Geert et al., : essential points) 1. seems containing two kinds of elements. One is code definitions and the other is data. Code definitions are useful to avoid duplications and fluctuations of description (like wat100N -- Watec Neptune 100). Currently only a part was defined. Code definition elements will be blow,,,,,,,,,,,, Where, is strange. Why combination only for orbits? Are those fixed combination now? So, software_code for each step in may be proper. It will be convenient enough to do code definition manually on VMO site. And almost all of them have no important information for computation. So online applications can be independent from these structures. It will make development of applications much easier.

9 2.Data part of (online applications transaction units, and ) should include all necessary data for computation in itself. This can be done only adding lon/lat/h to. 3.In case of traceable Email address is provided, the name field should allow nickname or abbreviation 4. Encrypted lon/lat with round value should be allowed. 5. Geoidal height should be allowed. ( ex. G+23.4 ) : no comments

10 6. cam_session_code like must exist. This should be client side decidable value. It should include session begin time ( hour and minute ). CAM_YYYYMMDD_hhmm_system ( “ – N “ suffix requires the management of last night observation ) 7. longitude, latitude, height, e_location is needed here for data compactness. 8. capture_software_code, measure_software_code should be here 9. video_fomat_code (PAL/NTSC/DVSD/MPEG4/ ….) should be here. 10. gain seems ambiguous, should be divided cam_gain, auto iris, white_balance ….. ??? 11. storage …. Compression should be treated independently 12. interlaced_order …. EVEN/ODD is ambiguous. Bottom field first? 13. exposure_time ….. How to express for NTSC ? 0.016688333 ? 14. effective_y …. Should be total y pixel even on interlaced video.

11 15. time_keeper_code, time_correction_interval should be here 16. e_time …. Should be e_time_abs : no comments 17. meteor_code should be CAM-YYYYMMDD-hhmm-SYSTEM-M9999 18. time … should be equal to the first pos time, like 2010-01-03T11:59:59.12345 19. duration … = end pos time – begin pos time, right? 20. speed …. Average ? 21. e_*_ra, e_*_dec should be one as e_*_ra_dec 22. pole_ra, pole_dec, e_pole_ra_dec should be added

12 23.Elements below may be worth to add (UA: ?) number_of_ref_stars, lm, e_astronomy, e_linearity, local_clip_name 24.Time should be 5 digits below second for NTSC 25. pos_x, pos_y is raw value, does not have meaning without plate constants. How about pos_ra_raw, pos_dec_raw, e_pos_ra_dec instead. 26. saturation_flag -> staturated_pixels 27. light_sum ? 28. e_time …. e_time_abs? 29. e_pos_ra, e_pos_dec -> e_pos_ra_dec 30.e_pos_line (linearity error) will be useful

13 ---- orbit section is not considered so deeply ------ This is good way to store multiple result of one actual meteor. But how to name the daily updated set? There will be thousands of set. So the keys to select sets will be important -orbit_code : why not exist? How to identify an orbit? -time : at 100km height seems not good idea. How to deal with that has no 100km point or having two 100km point ( like earth grazing meteor). -begin_lon, begin_lat, end_lon, end_lat is needed to search meteors on some region. -total_trajectory_length (km), total_duration will be useful. -entry_angle will be useful -solar_longitude will be very useful -z_avg : ???? Angle distance of observed radiant and modified radiant ? -state : at begin point? -e_e : AU?? -Some other quality measures such as Qd or Qr should be added. -Radiant error should be expressed by e_ellipse_azimus, e_ellipse_a, e_ellipse_b ??.

14 Necessary application layer interface Login - observer_code, password, program_code and One Time Password Upload observations - cam_session with cam_session_code Update / Delete observations - cam_session with cam_session_code, More partial update ? ( - deleted mark for detection of partial download ? ) Download observations - Minimum query condition region, time span, ( first modified time for download the new ones only?). - Packaging? - Data size or date range limit? - What will be downloaded? cam_sessions with locations or over all CSV? Note: We should allow free downloads, but should not allow free SQL queries to public! It is awfully dangerous. SQL has been causing many problems.

15 UFOSeries for VMO If all problems are cleared, the products below may appear UFOCaptueV2.5 : VMO code assignable UFOAnalyzerV2.5 : upload observations to VMO UFOAnalyzerV4 : accuracy computation UFOOrbitV2.5 : download observations from VMO UFOOrbitV3 : upload orbit to VMO UFOOrbitV4 : accuracy computation, using SPICE FireBallInspectorV4 UFORadiantV4


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