Data model: plParam

General description: These files contain the settings for the low-level plate routines: the ones that actually create the plFanuc files. For SDSS-III, some of these settings are actually relevant only for what happens earlier so are not actually used.

Naming convention: plParam-PLATERUN.par

Approximate size: 5 kbytes.

File type: Yanny

Read by products: plate

Written by products: platedesign

Required header keywords:

• obsPres (float32): typical pressure (parameter not used in SDSS-III
• obsRH (float32): typical relative humidity (parameter not used in SDSS-III)
• tropLR (float32): tropospheric lapse rate (deg K /meter) (parameter not used in SDSS-III)
• wave (float32): wavelength for differential refraction (parameter set elsewhere in SDSS-III)
• optDistScale (float32): plate scale, mm/deg (parameter set elsewhere in SDSS-III)
• optDistParity (int32): +1 if (x,y) right handed, -1 if (x,y) left handed (parameter set elsewhere in SDSS-III)
• optDistXcenter (float32): X center of radial distortions (mm) (parameter set elsewhere in SDSS-III)
• optDistYcenter (float32): Y center of radial distortions (mm) (parameter set elsewhere in SDSS-III)
• optDistCoeff (float32): coefficients for radial distortion (parameters set elsewhere in SDSS-III)
• qualityHoles (float32): locations of quality holes (parameter not set in SDSS-III)
• guideSelection (float32): parameter for guide star selection (set elsewhere in SDSS-III)
• spectrographs[2] (int32): which spectrographs are being used? (parameter set elsewhere in SDSS-III)
• guideReach (float32): reach parameters for guide fibers (parameters set elsewhere in SDSS-III)
• cSkyReach (float32): reach parameter for coherent sky (parameter not set in SDSS-III)
• bendDistScale (float32): scale parameter for plate bending distortion in shop
• bendDistParity (int32): same parity setting as optDistParity above
• bendDistXcenter (float32): X center of radial distortions during plate bending in shop (mm)
• bendDistYcenter (float32): X center of radial distortions during plate bending in shop (mm)
• bendDistCoeff (float32): coefficients for radial distortion during plate bending in shop
• plateShapeScale (float32): scale parameter for "plate shape" in shop (deflection in Z direction)
• plateShapeParity (int32): same parity setting as optDistParity above
• plateShapeXcenter (float32): X center for plate shape coefficients during plate bending in shop (mm)
• plateShapeYcenter (float32): X center for plate shape coefficients during plate bending in shop (mm)
• plateShapeCoeff (float32): coefficients for plate shape (deflection in Z direction) during plate bending in shop
• tempShop (float32): temperature of plate during drilling (deg C)
• ZOffset (float32): drilling offset (mm)
• ZOffsetR (float32): drilling offset (mm)
• thermalExpand (float32): percentage expansion per deg C (REALLY? PERCENTAGE??)
• maxRadius (float32): maximum hole position radius (mm)
• objectCodesFile (string): name of codes file for drilling language for an object or guide
• trapCodesFile (string): name of codes file for drilling language for a light trap
• endCodesFile (string): name of codes file for drilling language to end drilling
• alignCodesFile (string): name of codes file for drilling language for an alignment hole
• flatDistScale (float32): scale parameter for distortion from the drill configuration to the flat configuration
• flatDistParity (int32): same parity setting as optDistParity above
• flatDistXcenter (float32): X center for drill to flat distortion (mm)
• flatDistYcenter (float32): Y center for drill to flat distortion (mm)
• flatDistCoeff (float32): coefficients for drill to flat distortion (mm)

Notes on case: This file is case sensitive.

Note on distortion coefficients: They all refer to polynomial terms in radius (in mm), starting with r^0.

Example file: plParam-jun08.par