% Time-stamp: <1999-03-01 08:38:42 dph> 
% MIT Directory: ~dph/h2/ASC/ICD
% CfA Directory: /dev/null
% File: CO_AspHist_ICD.txt
% Author: D. Huenemoerder
% Original version: 990122
%====================================================================

DocID: dph005  ICD for Aspect Histogram


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Regarding:      Aspect Histogram: Processing and Data Products
ICD Version:    1.0
Today's Date:   08 Feb 1999

Submitted_by:   Kenny Glotfelty

Item number:    dph005.0001
Page:           pages 4 & 7.
                
Problem:	Synopsis: history mechanism proposed is inconsistent with all
		other tools in system.

		The history mechanism used by all other tools is
		described in ASC-FITS-1.4 which describes the HISTORY
		keywords used to record the inputs & outputs.
		
		The asphist ICD calls for an extra extension to put
		the entire parameter file.  This would make it
		inconsistent with all other tools.
		
		This extension should be removed from the ICD.


Dependendies:   No dependencies.  If there are specific parameters that need to 
		get added to header then they should be itemized
		specifically.  This will allow any tools that need to
		access the values of the parameters to do so without
		having to parse the embedded par file.

		Just to follow this up a little...
		
		My reaction is based in part on a decision that
		pre-dates my current role.  There was a meeting some
		time ago between some subset of SDS + Arnold + Janet +
		others to work out the history mechanism for all the
		tools.  There were two extremes: all parameters get
		recorded in history keys or only inputs & outputs
		stored in history keys.  The decision was to go with
		only storing the inputs and outputs in the history
		keys ... and each tool would then have a hand full of
		parameters that it would propagate to the output file
		as individual keywords.


Reply:          reluctantly accept
                
Due Date:       990215

Status:         Accepted for version 1.0
		990301 revised.
		CLOSED.


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Regarding:      Aspect Histogram: Processing and Data Products
Version:        1.0
Date:           990209
Submitted_by:   j.davis
Item number:    dph005.0002
Page:           7
                
Problem:        alternate coordinate system keywords should be of form
		"CXXXma" instead of "mCXXXn", as per "FITS Keyword
		Conventions..." (SDS 7.2, 11 Jan 99).
                
Dependencies:   FITS Keyword Conventions for ASC Data Model files.

Reply:          There several "conventions", 2 of which are given in
		the CXC "FITS Keyword Conventions" document.
                
Due Date:       990215

Status:         open, pending ruling from JCM, AR.
		990210 JCM reccommends: TBD, pending resolution of
		  CTYPEmk adoption.  Arnold says CTYPEmk is the one;
 		  kCTYPm is for multi-dimensional table elements
 		  (e.g., a column of images).
		990301 Updated text - made "generic" pending
		specification of correct keywords.  Added appendix w/
		explicit examples of coords.
		OPEN.