Clementine Basemap Regeneration These versions converted to GeoTiff and geoJpeg2000 format using GDAL. --for Jpeg2000 ll=lossless and ly=lossy --32bit ISIS files were scaled to 8bit using "-scale .048 0.5 1 255" --The 128ppd mosaic also further stretched usings a stdev 2 stretch. --Resolution 128 ppd = ~236 m/p and 256 ppd = ~118 m/p -Trent Hare thare@usgs.gov April, 2009 The lunar base map was regenerated utilizing the ULCN2005 control network. This product supercedes the original base map created in 1998, and also the warped product generated to reflect the shift from the original control point positions to the new positions in the 2005 control network. The ingestion, calibration, and merging exposure pairs were performed using ISIS2 software. The remaining processing was performed using ISIS3 software. The geometric control was verified and camera angles adjusted for the images showing obvious offset of features between overlapping images. If there were images in the original mosaic but not included in the ULCN2005 network, the camera pointing for these images were updated and included in the mosaic. The photometric corrections were applied to the level1 images, and then projected to either a equirectangular or polar stereographic projection. The projected images were then mosaicked together. Radiometric calibration algorithm in ISIS2: -------------------------------------------- Step 1. Global Offset Correction Step_1_DN = raw_DN - C4*OFFSET_MODE_ID - C5 C4 = -8.177 C5 = 15.56 Step 2. Divide by gain Step_2_DN = Step_1_DN / g(GAIN_MODE_ID) GAIN_MODE_ID g(GAIN_MODE_ID) 1 1.0 2 2.907 4 6.906 Step 3. Dark current correction Step_3_DN = Step_2_DN - (DC + C3) C3 = 7.13 Non-linearity correction XMUL = ACO + BCO*Step_3_DN + CCO*(Step_3_DN**2) + DCO*(Step_3_DN**3) Corrected_Step_3_DN = Step_3_DN * XMUL ACO = 1.062 BCO = -.1153E-02 CCO = .6245E-05 DCO = -.1216E-07 Step 4. Temperature-Dependent Offset Correction Step_4_DN = Corrected_Step_3_DN - C2 * u C2 = .003737 * exp(.0908*(T-273.15)) T = Corrected FOCAL_PLANE_TEMPERATURE (The value in the labels is not correct. The value used is taken from an interpolated set of values from ACT) u = t + readout time t = EXPOSURE_DURATION + .0494 readout time = 60.05 + .05*(line # - 1) Step 5. Frame Transfer Correction Step_5_DN = Step_4_DN - ro ro = column_sum*dt/(t+288*dt) column_sum = sum of all 288 Step_4_DN values dt = frame transfer time per row = .00068 t = EXPOSURE_DURATION + .0494 Step 6. Flat-Field and Exposure Time Normalization Step_6_DN = Step_5_DN / (FF*t) FF = Filter-dependent flat-field t = EXPOSURE_DURATION + .0494 The units of Step_6_DN are now in counts/ms. Step 7. Normalize to Sun-Moon distance of 1 AU Step_7_DN = Step_6_DN * (SOLAR_DISTANCE/AU)**2 AU = 149597870 km Step 8a. Conversion to 1 AU Relative Radiance L = Step_7_DN / C1 ( L = Radiance in mW/sr-cm**2 ) CENTER_FILTER_WAVELENGTH C1 415 nm 1.39 750 nm 2.57 900 nm 4.35 950 nm 4.76 1000 nm 2.77 Step 8b. Conversion to Reflectance R = Step_7_DN * CR The following CR values were derived by Eric Eliason on 6/20/96. These are slight improvements over Carle Pieter's values because Eric used the most current flat files and Alfred McEwen's non-linearity correction. For more information, see Eric's memo from 6/20/96. CENTER_FILTER_WAVELENGTH CR 415 nm .021406 750 nm .012266 900 nm .010674 950 nm .010831 1000 nm .024271 Photometric normalization templates for a, b, and cde filters in ISIS3: ----------------------------------------------------------------------- :::::::::::::: /usgs/cdev/contrib/bin/clem_uvvis_a.pvl :::::::::::::: Object = PhotometricModel Group = Algorithm Name = LunarLambertMcEwen EndGroup EndObject Object = NormalizationModel Group = Algorithm Name = MoonAlbedo D = 0.0 E = -0.222 F = 0.5 G2 = 0.39 H = 0.062 Bsh1 = 2.31 EndGroup EndObject :::::::::::::: /usgs/cdev/contrib/bin/clem_uvvis_b.pvl :::::::::::::: Object = PhotometricModel Group = Algorithm Name = LunarLambertMcEwen EndGroup EndObject Object = NormalizationModel Group = Algorithm Name = MoonAlbedo D = 0.0 E = -0.218 F = 0.5 G2 = 0.4 H = 0.054 Bsh1 = 1.6 EndGroup EndObject :::::::::::::: /usgs/cdev/contrib/bin/clem_uvvis_cde.pvl :::::::::::::: Object = PhotometricModel Group = Algorithm Name = LunarLambertMcEwen EndGroup EndObject Object = NormalizationModel Group = Algorithm Name = MoonAlbedo D = 0.0 E = -0.226 F = 0.5 G2 = 0.36 H = 0.052 Bsh1 = 1.35 EndGroup EndObject -------------------------------------------------------- LEVEL2 Map template --------------------------------------------- Group = Mapping ProjectionName = Equirectangular CenterLongitude = 0.0 CenterLatitude = 0.0 LatitudeType = Planetographic LongitudeDirection = PositiveEast LongitudeDomain = 180 Scale = 256.0 End_Group --------------------------------------------- Group = Mapping ProjectionName = PolarStereographic CenterLongitude = 0 CenterLatitude = 90 LatitudeType = Planetographic LongitudeDirection = PositiveEast LongitudeDomain = 180 Scale = 256.0 End_Group --------------------------------------------------------------------------- The ISIS2 formatted files are in /missions/clementine/Map_a_planet/ISIS2/ directory. Full resolution tiles: clembase_30n045_256ppd.isis2.cub lat=(0,60) lon=(0,90) clat=0 clon=0 clembase_30n135_256ppd.isis2.cub lat=(0,60) lon=(90,180) clat=0 clon=0 clembase_30n225_256ppd.isis2.cub lat=(0,60) lon=(-180,-90) clat=0 clon=0 clembase_30n315_256ppd.isis2.cub lat=(0,60) lon=(-90,0) clat=0 clon=0 clembase_30s045_256ppd.isis2.cub lat=(-60,0) lon=(0,90) clat=0 clon=0 clembase_30s135_256ppd.isis2.cub lat=(-60,0) lon=(90,180) clat=0 clon=0 clembase_30s225_256ppd.isis2.cub lat=(-60,0) lon=(-180,-90) clat=0 clon=0 clembase_30s315_256ppd.isis2.cub lat=(-60,0) lon=(-90,0) clat=0 clon=0 clembase_75n090_256ppd.isis2.cub lat=(60,90) lon=(0,180) clat=60 clon=0 clembase_75n270_256ppd.isis2.cub lat=(60,90) lon=(-180,0) clat=60 clon=0 clembase_75s090_256ppd.isis2.cub lat=(-90,-60) lon=(0,180) clat=-60 clon=0 clembase_75s270_256ppd.isis2.cub lat=(-90,-60) lon=(-180,0) clat=-60 clon=0 Reduced resolution tiles: clembase_00n000_002ppd.isis2.cub lat=(-90,90) lon=(-180,180) clat=0 clon=0 clembase_00n000_004ppd.isis2.cub lat=(-90,90) lon=(-180,180) clat=0 clon=0 clembase_00n000_008ppd.isis2.cub lat=(-90,90) lon=(-180,180) clat=0 clon=0 clembase_00n000_016ppd.isis2.cub lat=(-90,90) lon=(-180,180) clat=0 clon=0 clembase_00n000_032ppd.isis2.cub lat=(-90,90) lon=(-180,180) clat=0 clon=0 clembase_00n090_064ppd.isis2.cub lat=(-90,90) lon=(0,180) clat=0 clon=0 clembase_00n270_064ppd.isis2.cub lat=(-90,90) lon=(-180,0) clat=0 clon=0 clembase_45n090_128ppd.isis2.cub lat=(0,90) lon=(0,180) clat=0 clon=0 clembase_45n270_128ppd.isis2.cub lat=(0,90) lon=(-180,0) clat=0 clon=0 clembase_45s090_128ppd.isis2.cub lat=(-90,0) lon=(0,180) clat=0 clon=0 clembase_45s270_128ppd.isis2.cub lat=(-90,0) lon=(-180,0) clat=0 clon=0 Contact: Ella Lee elee@usgs.gov