Various coordinate systems are used during
surveys.
Lynns description in PNLFDCL
directory:
This subdirectory contains all the
data pertaining to the target fiducials on the secondary and
tertiary panels. There is a file for each of the two
reflectors named target.dat in both cases. This file
contains the measured locations of the panel fiducial holes
in the dome C/L coordinate system and units of inches.
These fiducials were measured on a coordinate measuring
machine at RSI when the panels were fabricated.
When calculating reflector errors it
is necessary to have the unit normals to the panel at the
fiducial point. The normals at the fiducial points are
obtained from fortran software included in this
subdirectory. The software is a parametric spline
interpolation system. The reflectors are defined by a
dense set of points and this interpolation system. The
dense set of points is in the file scndry.dat for the
secondary and trtry.dat for the tertiary (these are the ray
trace files pjp..) The data in these files is from the
PSK shaping software and is in the ray trace coordinate
system and units of feet.
The basic function of the fortran
interpolation system is to accept a r,phi parametric
variable pair and calculate the corresponding x,y,z
coordinates on the reflector surface. The software
also produces the surface derivatives which can then be used
to obtain the surface normals and jacobian of the mapping
from parametric space to physical space. The
interpolation system is contained in the two fortran files
interp2d.f and surfac.f which are common to both reflectors
and contained in the upper directory.
The calculation performed here is
the inverse of basic interpolation. Given a physical
point, calculate the corresponding r,phi parametric
variables and then the surface normal and jacobian at that
point. The fortran files scndry_fdcl.f and
trtry_fdcl.f perform these tasks. It starts by reading
the file of reflector data points and initializing the
interpolation system. It reads the file of fiducial
points and finds the corresponding parametric variables with
a root find routine. It then calculates the unit
surface normal and jacobian at that point. All of the
results are output to a file called fiducial.tbl for each
reflector.
There are two sets of files holding
the complete target set.
set # 
targets 
bytes 
fileTimeStamp 
file locations 
1 All reflector targets except the masked over targets on the first row. Includes the 4 vertex points at the beginning. 
1630 
53433  22feb99 
L3/align/PNLFCL/scndry/target.dat 
L3/align/year99/PNLFDCL/scndry/target.dat  
L3/greg/scndry/pnlset/target.dat  
2 all reflector targets and 4 vertex points at the beginning 
1661 
67678 
31oct03 
L3/align/PNLFCL/scndry/archive/target.dat 
L3/align/year99/PNLFDCL/scndry/archive/target.dat  
The optics in the dome is referenced to
the secondary. When aligning a horn (or the tertiary), a
theodolite is used. The steps are:
date of measurement 
#targets 
seet 1st used 
file location 
assumed source of dataset 
121102 
39 
990619  L2/121102/secref2.dsn 
pre 1999 
121031 
50 
990619  L2/AO_align_old_laptop/year12/oct3112/secref1.dsn 

121030  54 
990619  L2/AO_align_old_laptop/year12/oct3012/secref.dsn 

videogrametry
sec 2428jun04 

040628 
54 
040628 
L2/AO_align_old_laptop/year04/jun2804/scndry1/secref.dsn This is from last day of sec videogrammetry. 
040628VidGram? 
040628_o 
54 
040409  L2/AO_align_old_laptop/year04/jun2804/scndry1/secref_old.dsn  031111VidGram 
040508 
54 
040409  L1/040508/pc/secref.dsn 
031111VidGram 
040502 
54 
040409  L2/AO_align_old_laptop/year04/may0204/secref.dsn  031111VidGram 
040501 
54 
040409  L2/AO_align_old_laptop/year04/may0104/secref.dsn  031111VidGram 
040428 
54 
990619  L2/AO_align_old_laptop/year04/april2804/secref.dsn  pre 1999 
040409AM 040409PM 
54 
040409  L3/AO_data_old_desktop/align/year04/april0904/AM/secref.dsn/AO_data_old_desktop/align/year04/april0904/pM/secref.dsn  031111VidGram 
040225 
54 
990619  L3/AO_data_old_desktop/align/year04/feb2504/secref.dsn  pre 1999 
040214 
54 
990619  L3/AO_data_old_desktop/align/year04/feb1404/secref.dsn 
pre 1999 
031111
videogrammetry of secondary 

020331 
54 
991021  L2/AO_align_old_laptop/year02/mar3102/secref.dsn 
jan99jun99Surv 
010801 
54 
991021  L2/AO_align_old_laptop/year01/aug0101/secref.dsn  jan99jun99Surv 
010730 
54 
991021  L2/AO_align_old_laptop/year01/july3001/secref.dsn  jan99jun99Surv 
000201 
54 
991021  L2/AO_align_old_laptop/year00/feb0100/secref.dsn  jan99jun99Surv 
991021 
54 
991021 
L2/AO_align_old_laptop/year99/oct2199/secref.dsn  jan99jun99Surv 
990619 
54 
990619 
L2/AO_align_old_laptop/year99/jun2499/secref.dsn  pre 1999 
06jan99
to 23jun99 survey of secondary with theodolite. 

Table of different design files on disk
Some abbreviations:
location 
suf 
Match ref 
bytes pri,sec,ter 
hdrline 
notes 
L1 
.data 
Y 
566047,566047,566047  64 128 2 
current reference 
L3/align/PNLFCL/scndry 
.data 
Y (w) 
x,574496,x 
64 128 2  only secondary. MIW 
L3/align/PNLFCL/trtry  .data 
Y 
x,x,566047 
64 128 2  only tert. 
L3/align/PNLFCL/year99/scntry  .dat 
Y (w) 
x,574496,x 
64 128 2  only sec. MIW 
L3/align/PNLFCL/year99/trtry  .dat 
Y 
x,x,566047  64 128 2  only tert. 
L3/fnlchk/ 
.dat 
Y 
x,566047,566047 
64 128 2  
L3/greg/scndry/pnlset 
.dat 
Y  x,566047,x 
64 128 2  
L3/greg/trtry/pnlset  .dat 
Y  x,x,566047 
64 128 2  
L3/greg/set11 
.data 
Y 
566048,566048,566048 
64 128 2  
.old 
N 
668354,668424,668354 
64 128 2  2nd line: 1  
.orig 
N 
668358,668428,668555 
64 128 2  2nd line: 1  
L3/greg/set10  .data 
N 
445983,445983,445983 
25 128 1 
looks like fewer blocks. 
.orig 
N 
1269234,1268888,1268206 
25 128 1  2nd line: 1 some lines 3 #, some 4 # 

L3/greg/set8  .data 
N 
x,184489,184489 
25 1 129 
looks like this is old hdrline format 
More info: survey/lynnInfo