Terminology

• scan: set of data taken without changing the configuration
• eg: on,off pattern: on scan,off scan,calOnScan,calOffscan
• Scan number:
• Used to identify a scan. format: ydddnnnnn
• y  -last digit of yr
  
• To resolve 10yr ambiguities..look at the julian date in the header.
  
• ddd daynumber of year
• nnnnn .sequence number that starts over each day..
• 
  
• Pattern: a set of scan used to make an observation:
• eg: position switched onoff
• mapping
• PatternId:
• unique number given to all scans in a pattern. It usually matches the scan number of the first scan in the pattern.
  

---

Intro.

    The wapp correlator was used to take spectral line data.

--> this page is being worked on.

---

Keeping track of the data taken

    At the end of each month, the wapp spectral line files were scanned and some meta data was stored in an idl monthly save file. This included a structure holding the filenames, and a structure hold scan info.

The structures have:

• SLFILEARWS      STRUCT    = -> SLIND Array[64442]  .. 64442 files
• IDL> help,slfilearws,/st
  ** Structure SLIND, 6 tags, length=48, data length=48:
     PATH            STRING    '/share/pserverf.sda3/wappdata/'
     FILE            STRING    'wapp.20040820.a1946.0000.fits'
     SIZE            ULONG         94463936
     TAPENUM         ULONG                0
     I1              LONG                 0    .. i1,i2.. indices into slarws for the scans in this file
     I2              LONG                 1
• SLARWS          STRUCT    = -> SLWAS Array[294439]   294439 scans
• IDL> help,slarws,/st
  ** Structure SLWAS, 31 tags, length=432, data length=418:
     SCAN            LONG         423314477
     ROWSTART        LONG                 0
     FILEINDEX       LONG                 0
     STAT            BYTE         0
     RCVNUM          BYTE        17
     NUMFRQ          BYTE         8
     RECTYPE         BYTE        28
     NUMRECS         LONG                13
     FREQ            FLOAT     Array[8]
     JULDAY          DOUBLE           2453237.8
     SRCNAME         STRING    'FIXEDAZ'
     PROCNAME        STRING    'fixedaz'
     STEPNAME        STRING    'fixedaz'
     PROJID          STRING    'a1946'
     PATID           LONG         423314477
     SECSPERREC      FLOAT           1.00000
     CHANNELS        INT       Array[8]
     BW              FLOAT     Array[8]
     BACKENDMODE     STRING    Array[8]
     LAG0            FLOAT     Array[2, 8]
     BLANKING        BYTE         0
     AZAVG           FLOAT           179.745
     ZAAVG           FLOAT           9.07580
     ENCTMST         FLOAT           14479.0
     RAHRREQ         DOUBLE           1.5003924
     DECDREQ         DOUBLE           27.383586
     RADELTA         FLOAT           1.87982
     DECDELTA        FLOAT       0.000503314
     PNTERRASEC      FLOAT          0.975437
     ALFAANGLE       FLOAT           0.00000
     ALFACEN         BYTE         0
  
  

    Scanning the archive file structures showed some discrepancies between the files struct and the scan structures.

    The current wapp data found under /share/wappdata was also scanned to see how much of the original files were  still available online (or at least online in /share/wappdata).

    Comparing the files on disc and the files from the monthly archive showed the following:

• 64442  files from idl archives (started 20aug2004)
• 44187 files on /share/wappdata (15 were dangling links)
• Comparing the files from the two sources
• 29982 files in the idl archive were no longer in /share/wappdata
• Some files were probably renamed eg: A2010 -> a2010.
  
• 3727 files in on  /share/wappdata are in in the idl archive
• 212 of these were prior to the idl archive start date
• If a file was renamed after the idl archive scanned the directories then it would show up as missing.
• If the wapp data was placed in a directory that the idls canning routine was not aware of then it would also show up as missing.

The table below shows that files in the idl save archives that are currently not on  /share/wappdata.

•  The largest group of missing online files are form a2010.
• This is alfafa. this data was probably shipped to the PI's at cornell.
  

files in idl Archive and not on wappdata

index	project	files in idl arcive	files not on wappdata	Fraction missing
0	A1972	25	6	0.24
1	A2010	57	57	1.00
2	XALFA	65	6	0.09
3	a1653	28	6	0.21
4	a1713	6	4	0.67
5	a1785	9	1	0.11
6	a1850	1	1	1.00
7	a1943	66	30	0.45
8	a1946	366	299	0.82
9	a1956	1256	114	0.09
10	a1961	968	39	0.04
11	a1963	683	146	0.21
12	a1972	18	1	0.06
13	a2004	192	17	0.09
14	a2005	50	33	0.66
15	a2010	29482	21253	0.72
16	a2011	69	23	0.33
17	a2031	92	40	0.43
18	a2032	75	47	0.63
19	a2034	157	106	0.68
20	a2048	8047	430	0.05
21	a2050	86	2	0.02
22	a2055	123	7	0.06
23	a2056	280	125	0.45
24	a2060	681	256	0.38
25	a2088	7	4	0.57
26	a2123	48	22	0.46
27	a2127	11	3	0.27
28	a2133	475	8	0.02
29	a2147	47	23	0.49
30	a2153	142	63	0.44
31	a2156	13	8	0.62
32	a2172	261	118	0.45
33	a2186	6	4	0.67
34	a2187	174	52	0.30
35	a2217	89	65	0.73
36	a2220	95	65	0.68
37	a2221	35	27	0.77
38	a2228	55	41	0.75
39	a2234	178	14	0.08
40	a2267	5	4	0.80
41	a2302	28	5	0.18
42	a2323	1	1	1.00
43	a2326	80	7	0.09
44	a2334	357	20	0.06
45	a2350	134	63	0.47
46	a2355	282	8	0.03
47	a2361	307	22	0.07
48	a2383	133	34	0.26
49	a2411	154	19	0.12
50	a2432	28	9	0.32
51	a2433	230	48	0.21
52	a2507	372	43	0.12
53	p2111	86	23	0.27
54	s1662	32	5	0.16
55	unknown	19	9	0.47
56	vlbi	36	1	0.03
57	x101	515	41	0.08
58	x107	7	7	1.00
59	x108	102	47	0.46

processing: x101/closeout/archive/was/redo/doit.pro