blob: 5482745f8c319a83ca65b9d54907828cb4afd031 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
Appendix
========
Sample WCSDVARR extension header::
XTENSION= 'IMAGE ' / Image extension
BITPIX = -32 / array data type
NAXIS = 2 / number of array dimensions
NAXIS1 = 65
NAXIS2 = 33
PCOUNT = 0 / number of parameters
GCOUNT = 1 / number of groups
EXTVER = 1 / Distortion array version number
EXTNAME = 'WCSDVARR' / WCS distortion array
CRVAL2 = 0.0 / Coordinate system value at reference pixel
CRPIX1 = 0.0 / Coordinate system reference pixel
CRPIX2 = 0.0 / Coordinate system reference pixel
CRVAL1 = 0.0 / Coordinate system value at reference pixel
CDELT1 = 64 / Coordinate increment along axis
CDELT2 = 64 / Coordinate increment along axis
Sample science extension keywords defining a lookup table distortions::
CPERROR1= 0.058602706 / Maximum error of dgeo correction for axis 1
CPDIS1 = 'Lookup ' / Prior distortion function type
DP1 = 'EXTVER: 1.0' / Version number of WCSDVARR extension containing
DP1 = 'NAXES: 2.0' / Number of independent variables in distortion f
DP1 = 'AXIS.1: 1.0' / Axis number of the jth independent variable in
DP1 = 'AXIS.2: 2.0' / Axis number of the jth independent variable in
CPERROR2= 0.072911568 / Maximum error of dgeo correction for axis 2
CPDIS2 = 'Lookup ' / Prior distortion function type
DP2 = 'EXTVER: 2.0' / Version number of WCSDVARR extension containing
DP2 = 'NAXES: 2.0' / Number of independent variables in distortion f
DP2 = 'AXIS.1: 1.0' / Axis number of the jth independent variable in
DP2 = 'AXIS.2: 2.0' / Axis number of the jth independent variable in
|
