MISR: In-Flight Radiometric Calibration and Characterization Plan

is the affected area is about 30 pixels. Data Quality Indicators within the Level 1A product willflag this condition.4.2.7 Sub-pixel illuminationProblem: During crosstrack scanning of a subpixel spot across the array, there have beencases reported where the DN of the adjacent pixel decreases as the image approaches the pixel. Asthe signal is know to increase for this case, the data clearly misrepresent to scene. This situationseems to occur when there is illumination of the channel-stop, however the magnitude of the errorseems to be camera and band dependent.Cause: The cause of this phenomena has yet to be determined. It is clearly electrical innature, as no optical absorption or scattering mechanism can account for the observation.Impact on the Level 1B1 algorithm: It is rare that an actual scene will illuminate the arrayin this manner, where a large signal falls on the channel stop, and little energy falls on the activepixel element. In the event a DN value less than the offset for that line is recorded, a data qualityindicator will report the problem.4.3 ARCHIVAL OF PREFLIGHT INSTRUMENT DATAThe preflight camera reports and calibrations are maintained in both hardcopy andelectronic form. Reports include:• pinhole response (providing verification of focus, stray-light, hysteresis, and pointsource-function(PSF) determination);• radiometric calibration (providing response coefficients, signal-to-noise verification,pixel uniformity of response, and short-term stability)• spectral calibration (including out-of-band response);• polarization verification;• radiometric model (including the nominal flight integration time).This electronic archive provides a traceable path to the camera verification,characterization, and calibration data sets. An algorithm description, data analysis procedure, anduncertainty analysis will also be provided for each test.4.4 SPACECRAFT INTEGRATION4.4.1 Calibration panel exchangeDuring testing of the calibration diffuse panels it was determined that the spatialuniformity of the Flight panels was superior to that of the Engineering Model units. Further,37In-flight Calibration Plan, JPL D-13315