Description of ER2 Navigation During CEPEX Oct. 14, 1993 John del Corral, SIO The ER2 navigation data was provided by the Aircraft Data Facility at NASA-Ames Research Center, Moffett Field, California. The original ascii data files were converted to NetCDF by the CEPEX Data Integration Group at Scripps Institution of Oceanography. This data was recorded by the Navigation Data Recorder on board the ER2. Catalog of ER2 Navigation During CEPEX, Submitted by NASA, Ames Oct. 14, 1993 John del Corral,SIO Temporal Span: March 4 - April 8 1993 GMT Number of files: 16 File list: ER2 data set index File: < the data file name > year: < the year eg 1993 > julday: < julian day from the beginnig of year eq 32 = Feb. 1 > month: < the month number 1 .. 12 > day: < day of the month 1 .. 31 > hour: < decimal hour so 14.5 = 2:30 PM > lon: < degrees East Longitude [min] [max] > lat: < degrees North Latitude [min] [max] > File: ER2 NAVIGATION INDEX File: er2.nav.flight1.cdf year: 1993 julday: 63 month: 3 day: 4 hour: 23.668056 29.483334 lon: 145.865005 177.423340 lat: -19.291666 -17.676666 File: er2.nav.flight2.cdf year: 1993 julday: 68 month: 3 day: 9 hour: 21.520834 22.670834 lon: 177.380005 178.936661 lat: -17.803333 -16.573334 File: er2.nav.flight3.cdf year: 1993 julday: 71 month: 3 day: 12 hour: 22.015278 29.868055 lon: 177.236664 190.106674 lat: -17.918333 -2.000000 File: er2.nav.flight4.cdf year: 1993 julday: 74 month: 3 day: 15 hour: 21.531666 28.060278 lon: 177.330002 189.228333 lat: -17.094999 -2.005000 File: er2.nav.flight5.cdf year: 1993 julday: 75 month: 3 day: 16 hour: 22.688889 30.119444 lon: 171.458328 187.931671 lat: -17.798334 -5.855000 File: er2.nav.flight6.cdf year: 1993 julday: 76 month: 3 day: 17 hour: 23.520834 29.659721 lon: 174.028336 179.994995 lat: -17.776667 -2.000000 File: er2.nav.flight7.cdf year: 1993 julday: 79 month: 3 day: 20 hour: 22.187500 30.031944 lon: 165.063339 177.440002 lat: -17.885000 -1.966667 File: er2.nav.flight8.cdf year: 1993 julday: 82 month: 3 day: 23 hour: 22.029167 28.611111 lon: 177.241669 183.779999 lat: -17.924999 -2.000000 File: er2.nav.flight9.cdf year: 1993 julday: 84 month: 3 day: 25 hour: 21.470833 28.356945 lon: 169.893326 177.511673 lat: -17.934999 -2.005000 File: er2.nav.flight10.cdf year: 1993 julday: 87 month: 3 day: 28 hour: 22.008333 28.719444 lon: 169.881668 177.494995 lat: -17.820000 -2.000000 File: er2.nav.flight11.cdf year: 1993 julday: 89 month: 3 day: 30 hour: 22.493055 28.793056 lon: 175.820007 178.220001 lat: -17.791666 -4.548333 File: er2.nav.flight12.cdf year: 1993 julday: 93 month: 4 day: 3 hour: 19.245832 27.907778 lon: 168.903336 181.389999 lat: -18.375000 -1.983333 File: er2.nav.flight13.cdf year: 1993 julday: 94 month: 4 day: 4 hour: 22.004168 26.272223 lon: 177.258331 179.818329 lat: -17.808332 -14.188334 File: er2.nav.flight14.cdf year: 1993 julday: 95 month: 4 day: 5 hour: 20.015278 26.755556 lon: 177.291672 185.948334 lat: -17.798334 -2.005000 File: er2.nav.flight15.cdf year: 1993 julday: 97 month: 4 day: 7 hour: 19.891666 27.056944 lon: 177.389999 201.911667 lat: -17.760000 21.296667 File: er2.nav.flight16.cdf year: 1993 julday: 98 month: 4 day: 8 hour: 18.720833 21.579166 lon: 201.928329 219.990005 lat: 21.219999 30.711666 Data File Format: NetCDF Filename description: er2.nav.flightNN.cdf - Where NN is the flight number during CEPEX Example Header: netcdf er2.nav.flight16 { dimensions: number_of_samples = 3798 ; max_number_of_characters = 12 ; variables: char Time_Day(number_of_samples, max_number_of_characters) ; Time_Day:Name = "Time and Day" ; Time_Day:Units = "HH:MM:SS/DD" ; Time_Day:Time Convention = "24-hour Clock" ; char Time_Source_ID(number_of_samples, max_number_of_characters) ; Time_Source_ID:Name = "Time Source Identifier" ; Time_Source_ID:Units = "G: GOES; I: Internal Time Source" ; char Latitude(number_of_samples, max_number_of_characters) ; Latitude:Name = "Latitude" ; Latitude:Units = "hDD:MM.t" ; Latitude:Units h = "hemisphere (N: Northern, S: Southern)" ; Latitude:Units DD = "Degrees Latutude" ; Latitude:Units : = "Separator between degrees and minutes" ; Latitude:Units MM.t = "Minutes and tenths of minutes of longitude (with a decimal point)" ; char Longitude(number_of_samples, max_number_of_characters) ; Longitude:Name = "Longitude" ; Longitude:Units = "hDDD:MM.t" ; Longitude:Units h = "hemisphere (W: Western, E: Eastern)" ; Longitude:Units DDD = "Degrees Longitude" ; Longitude:Units : = "Separator between degrees and minutes" ; Longitude:Units MM.t = "Minutes and tenths of minutes of longitude (with a decimal point)" ; char Altitude(number_of_samples, max_number_of_characters) ; Altitude:Name = "Altitude" ; Altitude:Units = "feet (0-70000)" ; char Altitude_Indicator(number_of_samples, max_number_of_characters) ; Altitude_Indicator:Name = "Altitude Indicator" ; Altitude_Indicator:Units = "space if below 70000 feet; + if over 70000 feet" ; Altitude_Indicator:Note = "If over 70000 feet, Altitude contains 70000" ; char True_Air_Speed(number_of_samples, max_number_of_characters) ; True_Air_Speed:Name = "True Air Speed" ; True_Air_Speed:Units = "nautical miles per hour" ; char Aircraft_Pitch(number_of_samples, max_number_of_characters) ; Aircraft_Pitch:Name = "Aircraft Pitch" ; Aircraft_Pitch:Units = "Degrees, given to tenths (with a decimal point). Positive indicates nose up." ; char Aircraft_Roll(number_of_samples, max_number_of_characters) ; Aircraft_Roll:Name = "Aircraft Roll" ; Aircraft_Roll:Units = "Degrees, given to tenths (with a decimal point). Positive indicates right roll, i.e. right wing down." ; char True_Heading(number_of_samples, max_number_of_characters) ; True_Heading:Name = "True Heading" ; True_Heading:Units = "Degrees, given to tenths (with a decimal point). Zero indicates North, positive to the East of North. (90 indicates due East; 180 indicates South; and 270 indicates West." ; char North_South_Velocity(number_of_samples, max_number_of_characters) ; North_South_Velocity:Name = "North South Velocity" ; North_South_Velocity:Units = "nautical miles per hour" ; char East_West_Velocity(number_of_samples, max_number_of_characters) ; East_West_Velocity:Name = "East West Velocity" ; East_West_Velocity:Units = "nautical miles per hour" ; char Vertical_Velocity(number_of_samples, max_number_of_characters) ; Vertical_Velocity:Name = "Vertical Velocity" ; Vertical_Velocity:Units = "feet per second" ; char Ground_Speed(number_of_samples, max_number_of_characters) ; Ground_Speed:Name = "Ground Speed" ; Ground_Speed:Units = "nautical miles per hour" ; char Computed_Ground_Speed(number_of_samples, max_number_of_characters) ; Computed_Ground_Speed:Name = "Computed Ground Speed" ; Computed_Ground_Speed:Units = "nautical miles per hour (Square root of the sum of the squares of the North-South and East-West velocities)" ; char Computed_Wind_Speed(number_of_samples, max_number_of_characters) ; Computed_Wind_Speed:Name = "Computed Wind Speed" ; Computed_Wind_Speed:Units = "nautical miles per second (The vector difference of the True air speed and True heading and North-South and East-West velocities)" ; char Computed_Wind_Direction(number_of_samples, max_number_of_characters) ; Computed_Wind_Direction:Name = "Computed Wind Direction" ; Computed_Wind_Direction:Units = "degrees from North (clockwise is positive)" ; char Computed_Vertical_Velocity(number_of_samples, max_number_of_characters) ; Computed_Vertical_Velocity:Name = "Computed Vertical Velocity" ; Computed_Vertical_Velocity:Units = "feet per second (Computed from the altitude difference and time difference between consecutive records)" ; char Computed_Angle_of_Attack(number_of_samples, max_number_of_characters) ; Computed_Angle_of_Attack:Name = "Computed Angle of Attack" ; Computed_Angle_of_Attack:Units = "degrees, i.e Arcsine (Vertical velocity divided by ground speed)" ; char Static_Air_Temperature(number_of_samples, max_number_of_characters) ; Static_Air_Temperature:Name = "Static Air temperature" ; Static_Air_Temperature:Units = "degrees C (Computed from the first digitized analog value, if recorded" ; char DAV1(number_of_samples, max_number_of_characters) ; DAV1:Name = "Total Temperature" ; DAV1:Units = "-100 degrees C to 0 degrees C " ; char DAV2(number_of_samples, max_number_of_characters) ; DAV2:Name = "Total Pressure" ; DAV2:Units = "0 to +32 of Mercury (absolute)" ; char DAV3(number_of_samples, max_number_of_characters) ; DAV3:Name = "Static Pressure" ; DAV3:Units = "0 to +5 psi (absolute)" ; char DAV4(number_of_samples, max_number_of_characters) ; DAV4:Name = "Differential Pressure" ; DAV4:Units = "-3 to +3 psi (dynamic)" ; // global attributes: :software = "er2nav_2_cdf.c" ; :Author = "Erwin R. Boer @ C4/SIO/UCSD" ; :Date of software completion = "August 18, 1993" ; :FLIGHT YY-FLIGHT_NUMBER = "93-083" ; :DATE MM/DD/YY = "04/08/93" ; :A/C (Tail number of aircraft) = "709" ; :TAKEOFF TIME HH:MM/DD = "18:45/08" ; :LANDING TIME HH:MM/DD = "00:15/08" ; :RECORD UNIT NUMBER (ID number of navigation data recorder) = "2" ; :TITLE1 (To label contents of data records) = "" ; :TITLE2 (To label contents of data records) = "" ; :TITLE3 (To label contents of data records) = "" ; :TITLE4 (To label contents of data records) = "" ; }