================================================================================ ICET11 WCR Processed Data Directory Catalog ================================================================================ Last Update: 23 September 2011 Directory (flight number) Total Size FileDescriptors Comment Size File Beg_End Time RadMode-Ants Ants: H1-up beam H2-down_aft(h-pol) V2-down_aft(v-pol) V3-down beam ................................................................................ jul01 (rf01): total 2.0 GB 568M WCR.ICET11.20110701.150116_153905.CPP-H2H1V3.nc 206M WCR.ICET11.20110701.153906_155247.CPP-H2H1V3.nc 526M WCR.ICET11.20110701.155249_162748.CPP-H2H1V3.nc 210M WCR.ICET11.20110701.162749_164147.CPP-H2H1V3.nc 490M WCR.ICET11.20110701.164148_171425.CPP-H2H1V3.nc ................................................................................ jul04 (rf02): WCR not operational ................................................................................ jul06 (rf03): WCR not operational ................................................................................ jul11 (rf04): WCR not operational ................................................................................ jul12 (rf05): WCR not operational ................................................................................ jul15 (rf06): WCR not operational ................................................................................ jul17 (rf07): WCR not operational ................................................................................ jul22 (rf08): Flight to Puerto Rico Open house (outbound research flight) total 1.5 GB (nothing of significant interest in the radar data) 252M WCR.ICET11.20110722.121337_122526.CPP-H2V2H1V3.nc 159M WCR.ICET11.20110722.122527_124616.CPP-H1.nc 383M WCR.ICET11.20110722.124623_130417.CPP-H2V2H1V3.nc 705M WCR.ICET11.20110722.130719_134018.CPP-H2V2H1V3.nc ................................................................................ jul23 (rf09) total 5.9 GB 8.1M WCR.ICET11.20110723.133427_133531.CPP-H1.nc 2.6M WCR.ICET11.20110723.133538_133546.CPP-H2V2H1V3.nc 294M WCR.ICET11.20110723.134140_135525.CPP-H2V2H1V3.nc 46M WCR.ICET11.20110723.135527_140129.CPP-H1.nc 430M WCR.ICET11.20110723.140134_142140.CPP-H2V2H1V3.nc 307M WCR.ICET11.20110723.142142_143608.CPP-H2V2H1V3.nc 44M WCR.ICET11.20110723.144021_144223.CPP-H2V2H1V3.nc 2.5M WCR.ICET11.20110723.144749_144756.CPP-H2V2H1V3.nc 516M WCR.ICET11.20110723.145232_151640.CPP-H2V2H1V3.nc 554M WCR.ICET11.20110723.151642_154238.CPP-H2V2H1V3.nc 648M WCR.ICET11.20110723.154239_161258.CPP-H2V2H1V3.nc 490M WCR.ICET11.20110723.161301_163557.CPP-H2V2H1V3.nc 684M WCR.ICET11.20110723.163558_170759.CPP-H2V2H1V3.nc 700M WCR.ICET11.20110723.170800_174047.CPP-H2V2H1V3.nc 715M WCR.ICET11.20110723.174050_181419.CPP-H2V2H1V3.nc 435M WCR.ICET11.20110723.181421_183443.CPP-H2V2H1V3.nc 2.6M WCR.ICET11.20110723.184048_184056.CPP-H2V2H1V3.nc 4.7M WCR.ICET11.20110723.184817_184855.CPP-H1.nc 13M WCR.ICET11.20110723.184931_185026.CPP-H2H1V3.nc 2.7M WCR.ICET11.20110723.185027_185035.CPP-H2V2H1V3.nc 92M WCR.ICET11.20110723.185301_190459.CPP-H1.nc ................................................................................ jul24 (rf10) total 7.7 GB 40M WCR.ICET11.20110724.163116_163627.CPP-H1.nc 129M WCR.ICET11.20110724.163628_164230.CPP-H2V2H1V3.nc 616M WCR.ICET11.20110724.165043_171931.CPP-H2V2H1V3.nc 670M WCR.ICET11.20110724.171933_175055.CPP-H2V2H1V3.nc 604M WCR.ICET11.20110724.175057_181912.CPP-H2V2H1V3.nc 337M WCR.ICET11.20110724.181914_183501.CPP-H2V2H1V3.nc 59M WCR.ICET11.20110724.183656_184040.CPP-H1V3.nc 610M WCR.ICET11.20110724.184041_190915.CPP-H2V2H1V3.nc 525M WCR.ICET11.20110724.190916_193351.CPP-H2V2H1V3.nc 532M WCR.ICET11.20110724.193557_200052.CPP-H2V2H1V3.nc 633M WCR.ICET11.20110724.200054_203032.CPP-H2V2H1V3.nc 99M WCR.ICET11.20110724.203033_204326.CPP-H1.nc 499M WCR.ICET11.20110724.204328_210648.CPP-H2V2H1V3.nc 545M WCR.ICET11.20110724.210907_213437.CPP-H2V2H1V3.nc 626M WCR.ICET11.20110724.213438_220355.CPP-H2V2H1V3.nc 538M WCR.ICET11.20110724.220356_222907.CPP-H2V2H1V3.nc 558M WCR.ICET11.20110724.222909_225515.CPP-H2V2H1V3.nc 169M WCR.ICET11.20110724.225516_230311.CPP-H2V2H1V3.nc ................................................................................ jul27 (rf11) total 5.0 GB 376M WCR.ICET11.20110727.144810_151430.CPP-H2H1V3.nc 331M WCR.ICET11.20110727.151431_153744.CPP-H2H1V3.nc 376M WCR.ICET11.20110727.153745_160404.CPP-H2H1V3.nc 384M WCR.ICET11.20110727.160405_163101.CPP-H2H1V3.nc 215M WCR.ICET11.20110727.163102_164606.CPP-H2H1V3.nc 5.2M WCR.ICET11.20110727.164607_164630.CPP-H2H1V3.nc 224M WCR.ICET11.20110727.164700_165729.CPP-H2V2H1V3.nc 99M WCR.ICET11.20110727.165814_170510.CPP-H2H1.nc 98M WCR.ICET11.20110727.170823_172111.CPP-H1.nc 144M WCR.ICET11.20110727.172136_173145.CPP-H2H1.nc 156M WCR.ICET11.20110727.173202_174755.CPP-H2H1.nc 410M WCR.ICET11.20110727.174820_180731.CPP-H2V2H1V3.nc 133M WCR.ICET11.20110727.181030_181950.CPP-H2H1V3.nc 321M WCR.ICET11.20110727.182006_184237.CPP-H2H1V3.nc 387M WCR.ICET11.20110727.184238_190944.CPP-H2H1V3.nc 138M WCR.ICET11.20110727.190945_191924.CPP-H2H1V3.nc 268M WCR.ICET11.20110727.191925_193811.CPP-H2H1V3.nc 301M WCR.ICET11.20110727.193813_195918.CPP-H2H1V3.nc 367M WCR.ICET11.20110727.195947_202536.CPP-H2H1.nc 88M WCR.ICET11.20110727.202537_203146.CPP-H2H1.nc 1.2M WCR.ICET11.20110727.203148_203154.CPP-H2H1.nc 52M WCR.ICET11.20110727.203245_203929.CPP-H1.nc 199M WCR.ICET11.20110727.204445_205843.CPP-H2H1.nc ................................................................................ jul28 (rf12) total 4.3 GB 75M WCR.ICET11.20110728.142752_143308.CPP-H2H1V3.nc 111M WCR.ICET11.20110728.143925_144710.CPP-H2H1V3.nc 296M WCR.ICET11.20110728.145640_151724.CPP-H2H1V3.nc 155M WCR.ICET11.20110728.151725_152816.CPP-H2H1V3.nc 228M WCR.ICET11.20110728.152818_154414.CPP-H2H1V3.nc 115M WCR.ICET11.20110728.154416_155217.CPP-H2H1V3.nc 363M WCR.ICET11.20110728.155250_160949.CPP-H2V2H1V3.nc 177M WCR.ICET11.20110728.161253_162521.CPP-H2H1.nc 189M WCR.ICET11.20110728.162548_165035.CPP-H1.nc 251M WCR.ICET11.20110728.165100_170842.CPP-H2H1.nc 199M WCR.ICET11.20110728.170907_172302.CPP-H2H1V3.nc 169M WCR.ICET11.20110728.172303_173455.CPP-H2H1V3.nc 245M WCR.ICET11.20110728.173456_175207.CPP-H2H1V3.nc 246M WCR.ICET11.20110728.175208_180921.CPP-H2H1V3.nc 240M WCR.ICET11.20110728.180922_182610.CPP-H2H1V3.nc 248M WCR.ICET11.20110728.182611_184335.CPP-H2H1V3.nc 302M WCR.ICET11.20110728.184632_190740.CPP-H2H1V3.nc 210M WCR.ICET11.20110728.190741_192224.CPP-H2H1V3.nc 145M WCR.ICET11.20110728.192253_193303.CPP-H2H1.nc 88M WCR.ICET11.20110728.193322_194454.CPP-H1.nc 165M WCR.ICET11.20110728.194529_195707.CPP-H2H1.nc 110M WCR.ICET11.20110728.195750_201211.CPP-H1.nc ................................................................................ jul30 (rf13) total 3.8 GB 96M WCR.ICET11.20110730.143444_144721.CPP-H1.nc 97M WCR.ICET11.20110730.144755_151006.CPP-H1.nc 341M WCR.ICET11.20110730.151032_153431.CPP-H2H1.nc 446M WCR.ICET11.20110730.153457_160613.CPP-H2H1V3.nc 377M WCR.ICET11.20110730.160614_163238.CPP-H2H1V3.nc 220M WCR.ICET11.20110730.163240_164804.CPP-H2H1V3.nc 142M WCR.ICET11.20110730.164852_165829.CPP-H2H1V3.nc 116M WCR.ICET11.20110730.165830_170621.CPP-H2H1V3.nc 360M WCR.ICET11.20110730.170622_173044.CPP-H2H1V3.nc 298M WCR.ICET11.20110730.173046_175059.CPP-H2H1V3.nc 193M WCR.ICET11.20110730.175100_180402.CPP-H2H1V3.nc 327M WCR.ICET11.20110730.180441_182002.CPP-H2V2H1V3.nc 165M WCR.ICET11.20110730.182253_183428.CPP-H2H1V3.nc 212M WCR.ICET11.20110730.183429_184921.CPP-H2H1V3.nc 226M WCR.ICET11.20110730.184923_190514.CPP-H2H1V3.nc 109M WCR.ICET11.20110730.190538_191318.CPP-H2H1.nc 120M WCR.ICET11.20110730.191342_192925.CPP-H1.nc ................................................................................ 22K ICET11.20110512.cdl Processing cdl file 10K wcr2conf_icet11.pro WCR configuration file ................................................................................ ================================================================================ ICET11 WCR Processed Data Files Release Notes ================================================================================ * All WCR data product files (processed data) are in NetCDF and are cataloged above. Additional information about the variables and attributes in the files is provided in the netcdf prototype file ICET11.20110512.cdl. Detailed information about the radar configuration and calibration is given in wcr2conf_icet11.pro. * The data files are saved in directories (rfXX_mmmDD) representing the research flight number and month and date of the flight using the WCR. ATTENTION: If you are reading these notes via the WCR project web page the processed data directories/files are available for download via the web. The access may be password protected. Contact the PI(s) for user/password information. * Revision history: = RevisionDate: 23 September 2011 = RevisionNumber = 1 = Revision_1: Reflectivity, Doppler velocity = ProcessAuthor: Samuel Haimov (haimov@uwyo.edu, atsc-cc@uwyo.edu) * Known specifics of the data in this revision Reflectivity factor: = Reflectivity absolute accuracy has not been fully established for the recently upgraded radar yet. Given the past experience no more than 3 dB uncertainty is expected. The precision for the full received power dynamic range of the radar is expected to be less than 1 dB and should not exhibit significant non-linearities, drift, and receiver frontend temperature dependence. The received power from the near nadir pointing antenna has been calibrated with a corner reflector. The up and down-slant channels are calibrated relative to the down-channel using weather targets. The additional uncertainty for the up antenna and the down-aft antennas w.r.t. the down antenna is about 1 dB. = The receiver stability is temperature dependent and is within 0.5 dB for all the data recorded during this experiment. = The transmitter leak to the first few range gates of the received signals is small (estimated to less than 0.3dB above the mean noise) or not detectable. = The received signal from the up and down antennas can get saturated by weather targets stronger than about +22 dBZ in the first 200-300 m from the radar/aircraft. Surface return for up to 5.5 km AGL may have pixels(data points) in the saturation range (0 to ~+3 dBm). The percentage of saturated data points decreases with range and is small at large ranges. = Cross-antenna talk is possible. Strong down-aft antenna targets may leak to the up antenna return and strong down antenna targets may leak into the down-aft antenna return. The most frequent cross-talk contamination is from surface returns and it is most pronounced in the up beam return. = Down and down-aft Reflectivity in a few range gates above the surface returns (if any) may be cluttered by the surface or near surface targets (typically this is less than 150 m). The clutter is more pronounced for the down-aft beam. = Reflectivity is not corrected for attenuation due to absorption and scattering. It could be significant in the presence of cloud liquid water and precipitation. Polarization: The radar transmits and receives only linearly polarized microwaves. The orientation of the polarization in a 3-D moving platform constantly changes. In the processed data files the polarization orientation is noted with symbols 'h' and 'v' and their corresponding IDs of 1 and 0, respectively. The convention for this is based on the antennas fixed position with respect to the aircraft coordinate system and is as follow: 'h' and 'v' refer to their corresponding horizontal and vertical polarizations when a WCR beam is pointing horizontally and laterally w.r.t.the platform longitudinal axis of rotation(roll) For ICE-T, on an experimental basis, a new dual-pol down-aft antenna was installed with its 2 orthogonal polarizations rotated +45 deg w.r.t. the longitudinal x-axis of the aircraft (think of 45 deg roll). This rotation is not accounted for in the naming of the polarization and the antenna installation do not follow the above convention. For more information on how to handle these polarizations, if needed, contact Samuel Haimov (haimov@uwyo.edu) or Dave Leon (leon@uwyo.edu). Velocity: = A new installation of the radar antennas was built for this experiment. It was needed in order to accommodate a new dual-polarimetric antenna pointing down-aft. The limited beam-pointing calibration data showed that the antenna orientations for both the near nadir-pointing antenna and the new down-aft pointing antenna have changed in comparison with the older installation (used for PLOWS 2009-2010 experiment). The calibration data is not sufficient to establish with high accuracy the new pointing angles. This adds to the uncertainty of the Doppler velocity errors. = Corrected Doppler velocity from the down-pointing beams may have bias of +- 1.0 m/s and uncertainty of +-1.0 m/s or more. Typical bias and uncertainty are less than +-0.5 m/s. It is our belief that the bias is mainly due to changes in the antennas pointing angles caused by flexing of the aircraft fuselage not represented in the IRS data. In addition the fuselage expands with altitude and this also changes slightly the antenna pointing directions. Errors in the IRS(navigation) data have an effect as well. For this particular experiment there is also added uncertainty due to the unknown accuracy of the beam-pointing angle calibration. = Corected Doppler velocity accuracy from the up-pointing antenna is not quantified with a known reference target. The analysis of appropriate weather targets suggests a maximum bias of ~1 m/s. = The errors in the beam pointing angles for the up and down beams as well as some other errors lead to possible discontinuity in the mean vertical Doppler velocity profile at the flight level. The discrepancy is generally less than 0.3 m/s and typically within 0.1 m/s. It is not established which beam is contributing more to this error. Given that the aircraft flexes/expands differently at the up antenna location and the 2 down antenna locations as well as the dependence of these distortions on the altitude and attitude of the aircraft there is no single optimal correction (optimal set of beam angles) for all conditions. = The Doppler data frequently exhibit folded velocity regions for this experiment. We do not make an attempt to unfold due to difficulties of automating this process. Typically unfolding any specific data segment is not difficult. For help on this you may contact Samuel Haimov (haimov@uwyo.edu). * Known corrupted data not fixed in this revision: ================================================================================