Changeset 4800 for trunk/Ohana/src/libautocode/doc/notes.txt

Timestamp:

Aug 16, 2005, 3:04:36 PM (21 years ago)

Author:

eugene

Message:

moving to internal vs external measure/average: R,D + dR,dD.
NOTE * dR,dD now represent 1.0 arcsec, not 0.01 arcsec.

* all use has been updated to match

File:

• trunk/Ohana/src/libautocode/doc/notes.txt (modified) (2 diffs)

trunk/Ohana/src/libautocode/doc/notes.txt

@@ -14 +14 @@
     - fits_fread_datatable_NAME
     - fits_fwrite_datatable_NAME
-
-  
 
 FITS db APIs
@@ -112 +110 @@
   - unlock file
 
+
+---
+
+DVO tables
+
+I am converting all DVO tables to have an internal representation of
+the table with the necessary precision (ie, double for RA & DEC, etc),
+and a set of external representations in which the precision and
+available columns are truncated to fit a specific representation.  the
+autocode tables then include the internal name (ie, measure.d) and the
+external versions (ie, measure-elixir.d, etc).  
+
+To pursue this, I have modifed the definion of measure.d to replace,
+eg, dR with dR_PS.  I am now compiling all of ohana and looking for
+places where the new name is needed in the code, stopping the
+compilation.  (In the process, I am being forced to clean up the
+relphot - at least - coding problems: unused variables, undeclared
+functions, etc).  After I have made the changes, I will search for all
+instances of dR_PS and return them to their original.
+
+The only things to watch for in this process are units for the
+values.  In the older code, the value of measure.dR was interpreted as
+1/100th of an arcsec.  Everywhere this was the interpretation must be
+changed to make the value represent 1 arcsec.  This will also be an
+issue for the internal magnitude representations, which all use
+millimags...
+