PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = " 04 Nov 2002 S.McLaughlin Added paragraph about the MSICAL.TXT document. " RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2001-09-01 NOTE = "N/A" END_OBJECT = TEXT END The CALIB directory contains a set of files that are useful for the calibration of the NEAR MultiSpectral Imager (MSI). The files in the CALIB directory itself are used in conjunction with the MSI calibration software, while the files in the MSIBANDPASS directory are descriptions of the MSI filter responses. For a description of the MSI calibration processes and levels, refer to /NIEROS_2001/DOCUMENT/MSICAL.TXT. The document includes the two forms of the calibration equations applied to MSI images and describes the MSI processing levels such as RAD (image calibrated to units of radiance) and CIFDBL (cleaned and deblurred image calibrated to units of I/F). MSI Bandpass Calibration files: =============================== The /CALIB/MSIBANDPASS directory contains files describing the bandpasses of the filters used in conjunction the NEAR Multispectral Imager. One file is included for each filter, giving the scaled response as a function of wavelength. This information was provided by Scott Murchie. The files are as follows: BAND0450.TAB - 450 nanometer filter BAND0550.TAB - 550 nanometer filter BAND0700.TAB - 700 nanometer filter BAND0760.TAB - 760 nanometer filter BAND0900.TAB - 900 nanometer filter BAND0950.TAB - 950 nanometer filter BAND1000.TAB - 1000 nanometer filter BAND1050.TAB - 1050 nanometer filter MSI Flatfield and Point Spread Function Calibration files: ========================================================== In order to correct for sensitivity and non-uniformity of the MSI system, images were acquired before launch of the interior of a spectralon lined integrating sphere (details given in MURCHIE S., M. ROBINSON, S.E HAWKINS, III, A. HARCH, P. HELFENSTEIN, P. THOMAS, K. PEACOCK, W. OWEN, G. HEYLER, P. MURPHY, E.H. DARLINGTON, A. KEENEY, R. GOLD, B. CLARK, N. IZENBERG, J.F. BELL, III, W. MERLINE, AND J. VEVERKA 1999. Inflight calibration of the NEAR multispectral imager. Icarus 140, 66-91.) For the period of the mission when the transparent cover was used there are two flat fields used. After the cover was removed only one flat field is used, the files named with FLAT?_31C.FIT were used for both periods. The * is an integer representing a particular filter identification number. Non-uniformity correction files used with Cover on ================================================== FLAT0_31C.FIT filter 0 FLAT1_31C.FIT filter 1 FLAT2_31C.FIT filter 2 FLAT3_31C.FIT filter 3 FLAT4_31C.FIT filter 4 FLAT5_31C.FIT filter 5 FLAT6_31Cn.FIT filter 6 FLAT7_31Cn.FIT filter 7 COVERFLATRATIO0.FIT filter 0 COVERFLATRATIO1.FIT filter 1 COVERFLATRATIO2.FIT filter 2 COVERFLATRATIO3.FIT filter 3 COVERFLATRATIO4.FIT filter 4 COVERFLATRATIO5.FIT filter 5 COVERFLATRATIO6.FIT filter 6 COVERFLATRATIO7.FIT filter 7 Non-uniformity correction files used with Cover off =================================================== FLAT0_31C.FIT filter 0 FLAT1_31C.FIT filter 1 FLAT2_31C.FIT filter 2 FLAT3_31C.FIT filter 3 FLAT4_31C.FIT filter 4 FLAT5_31C.FIT filter 5 FLAT6_31CN.FIT filter 6 FLAT7_31CN.FIT filter 7 In order to correct the blurring of MSI images due to the deposition of contaminants of the optic during an aborted spacecraft burn system PSF were derived for each filter (details given in LI, H., M. S. ROBINSON, S. L. MURCHIE, AND J. R. NEUBERT 2000. Remediation of Scattered Light in NEAR MSI Images. Lunar and Planetary Science XXXI, 1790, Lunar and Planetary Institute, Houston. and LI, H., M. S. ROBINSON, S. L. MURCHIE 2001 (in press). Preliminary Remediation of Scattered Light in NEAR MSI Images, Icarus. PSF files ================================================ F1_512PSF_V2.FIT filter 1 F2_512PSF_V1.FIT filter 2 F3_512PSF_V2.FIT filter 3 F4_512PSF_V2.FIT filter 4 F5_512PSF_V2.FIT filter 5 F6_512PSF_V2.FIT filter 6 F7_512PSF_V2.FIT filter 7