Global Magnetic Drifter Pilot Project Data Format
Data format
The APS magnetic sensor made a measurement for 128 seconds every 20 minutes. Those 128 samples were averaged into one value of X,Y and Z magnetic field value. Every 4 hours the data were sent via Iridium to the Argo drifter database website
Once a day (every 24 hrs) a calibration cycle was run where 256 sequential raw data values were recorded. The data fields are ascii with an identifying first character to describe the type of data.
S: status line
S 000000000066760 123 270 2011.08.13 23:03:06 47.651360 -129.042221 8
S drifter_id rec_# day date time latitude longitude ?
M: measurement
M 1 -62475.9 -32540.4 -10721.9 19.39 47.9019 -128.9508 1.6 2011 224.80556 17.49
M meas_# xf yf zf temperature latitude longitude ? yr decimal_julian _day
E:
E 12.7 0
E battery_voltage ?
C: Calibration header
C 8 2011 225.12518
C id yr decimal_julian_day
c: calibration measurement
Data Snippet
S 000000000066760 123 270 2011.08.13 23:03:06 47.651360 -129.042221 8 M 1 -62475.9 -32540.4 -10721.9 19.39 47.9019 -128.9508 1.6 2011 224.80556 17.49 M 2 -62149.4 -32226.8 -10609.6 19.43 47.8619 -128.9498 1.0 2011 224.81944 17.27 M 3 -62421.8 -32850.4 -10549.6 19.51 47.8224 -128.9495 1.9 2011 224.83333 17.27 M 4 -62947.0 -33441.8 -10522.6 19.46 47.7834 -128.9499 1.6 2011 224.84723 17.37 M 5 -62645.0 -33261.3 -10306.0 19.86 47.7435 -128.9506 1.0 2011 224.86111 17.66 M 6 -61973.9 -32076.1 -10387.2 20.56 47.7046 -128.9503 1.0 2011 224.87500 17.64 M 7 -62114.1 -32533.0 -10342.7 20.15 47.6654 -128.9503 1.0 2011 224.88889 17.32 M 8 -32815.3 -42382.6 31311.9 19.62 47.6257 -128.9497 9.9 2011 224.90320 17.39 M 9 -31184.2 -42279.9 31509.2 17.91 0.0000 0.0000 0.0 2011 224.91708 17.24 M 10 -45160.4 -50575.0 39316.0 16.88 47.5499 -128.9567 7.4 2011 224.93097 16.96 M 11 -40946.5 -76445.5 39887.3 16.53 0.0000 0.0000 0.0 2011 224.94485 17.00 M 12 -41006.2 -75652.7 39661.8 16.64 47.6047 -129.0018 4.2 2011 224.95872 17.12 E 12.7 0 S 000000000066760 124 268 2011.08.14 03:02:21 47.946709 -129.119843 4 C 8 2011 225.12518 c 233 -27366.5 -76053.9 14041.0 17.27 c 234 -27193.7 -75863.6 13992.4 17.27 c 235 -25388.9 -77275.0 14923.7 17.27 c 236 -21542.5 -79203.1 16757.6 17.27 c 237 -23558.5 -81968.0 17548.2 17.27 c 238 -22028.9 -75012.1 14805.1 17.27 c 239 -19353.7 -71871.7 14504.2 17.27 c 240 -17910.5 -70902.9 14708.6 17.27 c 241 -17443.3 -74650.7 16259.2 17.27 c 242 -18313.7 -74747.0 15952.4 17.27 c 243 -19878.5 -72758.9 14633.6 17.27 c 244 -24924.9 -74086.3 13708.0 17.27 c 245 -16604.9 -76572.9 17397.1 17.59 c 246 -21436.9 -75726.1 15272.2 17.59 c 247 -20259.3 -72515.8 14418.2 17.59 c 248 -18604.9 -76481.5 16556.9 17.59 c 249 -20592.1 -74784.2 15167.7 17.59 c 250 -17628.9 -71157.0 14911.4 17.59 c 251 -22889.7 -77703.1 15707.4 17.59 c 252 -20086.5 -73319.6 14772.8 17.59 c 253 -16953.7 -70584.4 15005.5 17.59 c 254 -19488.1 -73028.8 14866.7 17.59 c 255 -13804.9 -63347.5 14500.1 17.59 c 256 -16940.9 -64388.0 13245.8 17.34 S 000000000066760 125 323 2011.08.14 03:03:29 47.942814 -129.044510 8 C 7 2011 225.12518 c 204 -35148.9 -77591.9 14191.4 16.95 c 205 -40998.5 -73769.4 13098.5 16.95 c 206 -39830.5 -74034.4 13034.3 16.95 c 207 -47622.5 -69247.5 12978.6 16.95 c 208 -49222.5 -68372.8 13234.5 17.27 c 209 -37699.3 -74434.2 12976.9 17.27 c 210 -38915.3 -82531.2 16941.2 17.27 c 211 -35740.9 -77267.5 14070.3 17.27
"Doc" and "Happy" remain on shore for the present time
"Sneezy", "Bashful" and "Grumpy" have stopped working as of 6/13/13
"Dopey" stopped working 8/9/13
"Sleepy" stopped working 10/4/13