Level 1 data includes airborne gravity measurements. The line data are hosted in the following folder:

**/AGAP/DataLevel_1/GRAVITY/GRAVITY_v2/AIRGrav_AGAPv2_Lines**

(Nomenclature: AIRGrav_AGAPv2_Lines.xyz – Geosoft format ASCII file)**/AGAP/DataLevel_1/GRAVITY/Esri_Shapefiles/AIRGrav_Attitudev2_Flights_Shapefiles**

(Nomenclature: AIRGrav_Attitudev2_Flight_###.shp – ESRI Shapefile Points)

Variable Name | Format | Units | Description |
---|---|---|---|

LAT | F15.7 | degrees | Latitude decimal degrees WGS-84 |

LONG | F15.7 | degrees | Longitude decimal degrees WGS-84 |

DATE | A9 | YYYYMMDD | Date |

DAY | A5 | DDD | Day of year |

TIME | A11 | seconds | UTC seconds past midnight (rolls over) |

FIDUCIAL | F11.2 | seconds | UTC seconds past midnight (continuous) |

PSX | F15.2 | m | Polar stereographic X WGS-84 |

PSY | F15.2 | m | Polar stereographic Y WGS-84 |

LAMX | F15.2 | m | Lambert conic conformal X WGS-84 |

LAMY | F15.2 | m | Lambert conic conformal Y WGS-84 |

WGSHGT | f11.2 | m | Height WGS-84 (height above GRS80 ellipsoid) |

FX | F15.2 | mGal | Gravimeter X acceleration |

FY | F15.2 | mGal | Gravimeter Y acceleration |

FZ | F15.2 | mGal | Gravimeter Z acceleration |

EotGrav | F15.2 | mGal | Eotvos and latitude corrected gravity, unfiltered |

FACor | F11.2 | mGal | Free air correction |

IntCor | F11.2 | mGal | Intersection levelling correction |

FAGrav70s | F11.2 | mGal | Free air gravity, 70s full wavelength filter |

FAGrav100s | F11.2 | mGal | Free air gravity, 100s full wavelength filter |

FAGrav140s | F11.2 | mGal | Free air gravity, 140s full wavelength filter |

Notes:

70s full wavelength filter = 0% pass at 52.5s, 100% pass at 105s

= approx 2.6 km half-wavelength resolution at 75 m/s flying speed

100s full wavelength filter = 0% pass at 75s, 100% pass at 150s

= approx 3.7 km half-wavelength resolution at 75 m/s flying speed

140s full wavelength filter = 0% pass at 105s, 100% pass at 210s

= approx 5.2 km half-wavelength resolution at 75 m/s flying speed

-Positions are for the gravimeter, not the GPS antenna.

-2 Hz data rate

-Line numbering convention used:

The llll.xx where llll is the line number and xx tracks the order in which segments

of the line were flown. For example, line 270.02 is the second segment or reflight flown

of the planned line 270.

In the case of ferry “bonus” lines, the .xx extension is the order in which the ferry lines

were flown in the flight. For example, 2029.03 is the 3rd ferry line in flight 29.

Line numbers are limited to 4 digits plus extension with no letters. The following system

was used to translate LDEO planned lines into a format which fit into 4 digits:

LDEO Scheme | SGL Scheme | |
---|---|---|

Ferry “Bonus” Lines | Not planned, numbered as they happen. 20000 – 20999 |
Not planned, numbered as they happen. 20ff, where ff is flight number |

Dome A Flight Lines | 270 – 760 | 270-760 |

Dome A Tie Lines | 10090 – 10310 | 1090-1310 |

Fuji Tie Lines | F01 – F11 | Renamed to match Dome A segments |

Recovery Trend Lines | R01 – R06 | 4001-4006 (4001-4003 not flown, 4007-4012 added instead) |

Vostok Tie Lines | V01 – V14 | Renamed to match Dome A segments |

South Pole Flight Lines | S01 – S07 | Renamed to match Dome A segments |

– Some flights are actually two flights processed together. Flights break down as follows:

001 ::: FLT-1 and 2 from Pole to AGAPS

003 ::: FLT-3

004 ::: FLT-4 and 5 (FLT-5 was a compensation)

006 ::: FLT-6

007 ::: FLT-7

008 ::: FLT-8 and 9

010 ::: FLT-10 and 11

012 ::: FLT-12

013 ::: FLT-13

014 ::: FLT-14

016 ::: FLT-16

017 ::: FLT-17 and 18

019 ::: FLT-19 and 20

021 ::: FLT-21 and 22

023 ::: FLT-23

024 ::: FLT-24 and 25

026 ::: FLT-26 and 27

029 ::: FLT-28 and 29 (FLT-28 was a compensation, gravity not processed for that portion of flight)

030 ::: FLT-30 and 31

032 ::: FLT-32 and 33

034 ::: FLT-34

035 ::: FLT-35 and 36

037 ::: FLT-37 and 38

039 ::: FLT-39

040 ::: FLT-40 and 41

042 ::: FLT-42 and 43

044 ::: FLT-44

045 ::: FLT-45

046 ::: FLT-46

047 ::: FLT-47

048 ::: FLT-48 and 49

050 ::: FLT-50 and 51

052 ::: FLT-52