MOPEX Online Manual
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Mosaic Modules: Fiducial Image Frame
Output Directory Keyword: OUTPUT_DIR
Default Output Directory: <output_dir>
Depends on: Input files
Important Notes: Running this module will overwrite any pre-existing FIF.tbl file in the output directory.
PURPOSE
-
This module creates a unified grid coordinate system and defines the
spatial boundaries which will include all BCD images. The output FIF
table is required for later modules to run. It can be generated by
this module, or set as an input using a pre-existing table.
PARAMETER BLOCK
-
&FIDUCIALIMAGEFRAMEIN
Edge_Padding = 10,
CROTA2 = A,
Projection_Type = "TAN",
Coordinate_System = "J2000",
&END
INPUTS
Edge_Padding: (int) This number specifies how much extra space (arcseconds) will be added to the four edges of the final mosaiced image.
CROTA2: (float) defines the orientation (degrees East of North). CROTA2 = 0 indicates North up and East left. CROTA = A uses the average of the input BCD image orientations.
Projection: This parameter specifies the projection type of the output mosaic. The SIN and TAN projections are implemented using the fast direct plane-to-plane coordinate transformation. The rest of the projections in the WCS library - LIN, AZP, STG, ARC, ZPN, ZEA, AIR, CYP, CAR, MER, CEA, COP, COD, COE, COO, BON, PCO, GLS, PAR, AIT, MOL, CSC, QSC, TSC, NCP, DSS, PLT - are implemented as a two step plane-sky-plane projection.
Coordinate_system: The coordinate system of the output mosaic. The choices are J2000 (Equatorial), Galactic, or Ecliptic. The default is J2000.
OUTPUTS
Generated Headers List Table (header_list.tbl): this file lists the World Coordinate Systems (WCS) information from each of the BCD image headers. The information is used to make the Fiducial Image Frame table.
Generated FIF Table (FIF.tbl or user selection): this text file is used by later modules for putting together a mosaiced image with specified pixel size, orientation and the final image size. The module overwrites any input FIF table specified in the namelist. Note that the output mosaic will always use the set of keywords CDELT1, CDELT2 and CROTA2, even if the input images use the CD matrix convention.
The outputs of this module are written to the top output directory specified in the namelist.
DISCUSSION
This module creates a table which is required for any mosaicking using MOPEX. If this module does not run, an existing FIF table has to be specified, otherwise later modules will not run. After this module is run once, the output FIF table can be modified manually, and the Mosaic Geom module used to produce a mosaic of only a subset of the entire BCD dataset.Even if the input images use the CD matrix convention, the output mosaic images (and by extension the interpolated images) will use the set of keywords CDELT1, CDELT2 and CROTA2, since the mosaic image is undistorted.
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