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en:news:ucac4_catalog [2012/10/14 09:35]
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en:news:ucac4_catalog [2016/03/03 16:08] (current)
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 ===== Use with Skychart ===== ===== Use with Skychart =====
 +
 +**A new version is available since March 4 2013 with correction for the following problems with the original data:**
 +  * Correction for the high proper motion stars as describe [[http://​www.usno.navy.mil/​USNO/​astrometry/​optical-IR-prod/​ucac|here]].
 +  * Removal of streak stars specifically present in the galaxy center area. You can read all the detail about streak removal on [[en:​news:​ucac4_streak|this page]]. In the case you need the full UCAC4 data, including the "​streak"​ you can activate a second catalog in the ucac4_streak folder which contain the removed data.
 +\\
  
 A catalog is build with this data is available for use with Skychart software.\\ A catalog is build with this data is available for use with Skychart software.\\
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 To use this catalog start by getting the part you need from the [[en:​download]] page.\\ To use this catalog start by getting the part you need from the [[en:​download]] page.\\
 It is split in three part so you can get only the zone visible from your area, but you need all for a full sky coverage. It is split in three part so you can get only the zone visible from your area, but you need all for a full sky coverage.
-  * ucac4-catalog-south.zip ​  : South zone -90 to -30 +  * ucac4-catalog-v2-south.zip ​  : South zone -90 to -30 
-  * ucac4-catalog-equator.zip : Equatorial zone -30 to +22.5 +  * ucac4-catalog-v2-equator.zip : Equatorial zone -30 to +22.5 
-  * ucac4-catalog-north.zip ​  : North zone +22.5 to +90 +  * ucac4-catalog-v2-north.zip ​  : North zone +22.5 to +90 
-A fourth file ucac4-index.zip contain the optional search index for all the zones. Note that you need to use skychart version 3.7-svn2252 or later in order to use the index.\\+A fourth file ucac4-index-v2.zip contain the optional search index for all the zones. Note that you need to use skychart version 3.7-svn2252 or later in order to use the index.\\
  
 Each file is about 600 MB is size. Each file is about 600 MB is size.
  
-Extract ​all this zip in the same directory (Program Files\Ciel\cat,​ share/​skychart/​cat). As each file is autonomous ​there is two common ​file on each, when prompted for replacement you can respond yes or no without effect.+Extract ​every zip in the same directory (Windows: ​Program Files\Ciel\cat\Linux: /usr/share/​skychart/​cat/, Mac: Applications/​Cartes du Ciel/cat/). As each zip can be used without the other there is two common ​files on each, when prompted for replacement ​by your zip software ​you can respond yes or no to overwrite ​without effect.
  
-Then from Skychart open the menu [[en:​documentation:​catalog|Setup -> Catalog -> Catalog]], click the **Add** button and select the file 4uc.hdr. Click on the first column to make it green.\\+Then from Skychart open the menu [[en:​documentation:​catalog|Setup -> Catalog -> Catalog]], click the **Add** button and select the file ucac4\4uc.hdr. Click on the first column to make it green.\\
 Do not forget to save the default options. Do not forget to save the default options.
 +
 +{{:​en:​news:​config_ucac1.jpg?​300|}} ​ {{:​en:​news:​config_ucac2.jpg?​200|}}
 +
 +Then zoom to a one degree FOV {{:​en:​news:​zoom1.jpg|}} and you must now see the magnitude 16 stars.
  
 My preferred star catalog setting for general use is now: My preferred star catalog setting for general use is now:
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   * 0 OK    * 0 OK 
   * 1 double (UCAC4 combined double star flag is non zero)    * 1 double (UCAC4 combined double star flag is non zero) 
-  * 2 streak, ​magnitude set to 99 (UCAC4 object type flag = 2 and no magnitude from 2MASS or APASS) ​+  * 2 streak, ​the star is put on a separate directory
   * 4 non APASS V or UCAC magnitude ​   * 4 non APASS V or UCAC magnitude ​
   * 8 DSO match ( UCAC4 gc flag >= 5 or leda>0 or x2m>​0)  ​   * 8 DSO match ( UCAC4 gc flag >= 5 or leda>0 or x2m>​0)  ​
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 ===== Build your own catalog ===== ===== Build your own catalog =====
  
-If you have a copy of the UCAC4 DVD, or if you can download the files from [[http://​vizier.cfa.harvard.edu/​viz-bin/​ftp-index?/​ftp/​cats/​bincats/​UCAC4/​bindat|Vizier]],​ you can use Catgen to build your own catalog from the original data files. This allow you to include more or less information for each star depending on your needs. 
  
-You must first convert the binary data on the DVD to ASCII text files using the include u4dump program or my u4conv program.\\  +If you have a copy of the UCAC4 DVD, or if you download the full u4b folder from the [[ftp://​cdsarc.u-strasbg.fr/​cats/​I/​322A/​|CDS]] or a [[http://​casdc.china-vo.org/​mirror/​UCAC/​UCAC4/​|web mirror]], you can use Catgen to build your own catalog from the original data files. This allow you to include more or less information for each star depending on your needs. 
-The advantage of u4conv is it process all the files at a time, add the star identifier, a selected magnitude and the color index after the other data.\\ + 
-You can download u4conv for [[http://​www.ap-i.net/​pub/​skychart/​ucac4/​u4conv.zip|Windows and Linux]] or get the [[https://skychart.svn.sourceforge.net/svnroot/​skychart/​trunk/​tools/​cat/​ucac4/​src/​|source code]]. Run the program in a console to show the syntax help.+You must first copy the DVD content to your disk to correct for the error with the high proper motion stars. See [[http://​www.usno.navy.mil/​USNO/​astrometry/​optical-IR-prod/​ucac|USNO UCAC page]] for more information and to get the script required to correct the binary data. 
 + 
 +Then convert the binary data on the DVD to ASCII text files using the include u4dump program or my u4conv program.\\  
 +The advantage of u4conv is it process all the files at a time, add the star identifier, a selected magnitude and the color index after the other data. It also remove the [[en:​news:​ucac4_streak|streak]] by using the file streaklist.txt.\\ 
 +You can download u4conv for [[http://​www.ap-i.net/​pub/​skychart/​ucac4/​u4conv.zip|Windows and Linux]] or get the [[http://svn.code.sf.net/p/skychart/code/​trunk/​tools/​cat/​ucac4/​src/​|source code]]. Run the program in a console to show the syntax help.\\ 
 +The %%--cddir%% option must point to the folder containing u4b/, not the individual data files.
  
-Then use [[en:​documentation:​catgen|Catgen]] to convert the text files to a binary catalog optimized for chart display. You can start by loading the [[https://skychart.svn.sourceforge.net/svnroot/​skychart/​trunk/​tools/​cat/​ucac4/​ucac4_catalog.prj|project file]] used for the standard catalog.\\+Then use [[en:​documentation:​catgen|Catgen]] to convert the text files to a binary catalog optimized for chart display. You can start by loading the [[http://svn.code.sf.net/p/skychart/code/​trunk/​tools/​cat/​ucac4/​ucac4_catalog.prj|project file]] used for the standard catalog.\\ 
 +If you use Linux or Mac OS, be sure to read the specific notes in the Catgen documentation page.\\
 Use a snapshot more recent than skychart-3.7-2252 to build an index more than 2GB in size. Use a snapshot more recent than skychart-3.7-2252 to build an index more than 2GB in size.
  
en/news/ucac4_catalog.1350200135.txt.gz · Last modified: 2015/11/06 20:35 (external edit)