OR/14/014 Part 2: Survey logistics - Revision history

Dbk: /* Airborne system */

2015-08-06T08:50:00Z

Airborne system

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	==Airborne system==		==Airborne system==
	[[Image:14014 fig12.jpg\|thumb\|~~center~~\|500px\|'''Figure 12''' Airborne system.]]		[[Image:14014 fig12.jpg\|thumb\|left\|500px\|'''Figure 12''' Airborne system.]]

	==Tests and calibration==		==Tests and calibration==

Dbk: /* Survey aquisition progress */

2015-08-06T08:49:49Z

Survey aquisition progress

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	\| <p align="center">1</p>		\| <p align="center">1</p>
	\|-		\|-
	\| Lost days due to Data / System Noise		\| Lost days due to Data/System Noise
	\| <p align="center">0.5</p>		\| <p align="center">0.5</p>
	\|-		\|-

Dbk: /* Survey aquisition progress */

2015-08-06T08:49:13Z

Survey aquisition progress

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	\|}		\|}
	{{clear}}		{{clear}}
	[[Image:14014fig11a.jpg\|thumb\|~~center~~\|500px\|'''Figure 11''' Production.]]		[[Image:14014fig11a.jpg\|thumb\|left\|500px\|'''Figure 11''' Production.]]
	{{clear}}		{{clear}}

Dbk at 08:48, 6 August 2015

2015-08-06T08:48:56Z

← Older revision		Revision as of 09:48, 6 August 2015
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	\| Survey Speed\|\|:\|\|140 knots		\| Survey Speed\|\|:\|\|140 knots
	\|-		\|-
	\| Magnetometer (x3)\|\|:\|\|Scintrex CS-3 single cell caesium vapour, wing pod(s) and/or tail stinger installation, sensitivity = 0.01 nT , sampling rate = 0.5 s, ambient range 20,000 to 100,000 nT. The general noise envelope was kept below 0.5 nT.		\| Magnetometer (x3)\|\|:\|\|Scintrex CS-3 single cell caesium vapour, wing pod(s) and/or tail stinger installation, sensitivity = 0.01 nT , sampling rate = 0.5 s, ambient range 20 000 to 100 000 nT. The general noise envelope was kept below 0.5 nT.
	\|-		\|-
	\| Digital Acquisition\|\|:\|\|FASDAS		\| Digital Acquisition\|\|:\|\|FASDAS
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	===System log===		===System log===
	The difference between the time a reading is taken and the time it is stored, due to computer processing time and position of the different sensors relative to the GPS antenna was determined in the field. See [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]] for the lag value of the different geophysical systems.		The difference between the time a reading is taken and the time it is stored, due to computer processing time and position of the different sensors relative to the GPS antenna was determined in the field. See [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]] for the lag value of the different geophysical systems.

	===Magnetic tests and calibration===		===Magnetic tests and calibration===
	====MAGNETOMETER COMPENSATION (FOM)====		====MAGNETOMETER COMPENSATION (FOM)====
	The compensation procedure involved the flying, at altitude, over a magnetically quiet area, undertaking aircraft manoeuvres, rolls ± 10°, pitches ± 5° and yaws ± 5°, along headings parallel to the traverse and control line trends. A fluxgate magnetometer monitored these manoeuvre noise effects and the compensator accumulated the results. The compensator returned a Figure of Merit (FOM) value, results of which are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].		The compensation procedure involved the flying, at altitude, over a magnetically quiet area, undertaking aircraft manoeuvres, rolls ± 10°, pitches ± 5° and yaws ± 5°, along headings parallel to the traverse and control line trends. A fluxgate magnetometer monitored these manoeuvre noise effects and the compensator accumulated the results. The compensator returned a Figure of Merit (FOM) value, results of which are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]].

	====PARALLAX CONTROL====		====PARALLAX CONTROL====
	Before the commencement of the survey several lines were flown at standard speed and flying height in opposite directions over a suitable, well controlled magnetic anomaly to establish the parallax of the system (spatial relationship between GPS and magnetometer readings).		Before the commencement of the survey several lines were flown at standard speed and flying height in opposite directions over a suitable, well controlled magnetic anomaly to establish the parallax of the system (spatial relationship between GPS and magnetometer readings).

	The system noise was measured and recorded at the project site before the survey started, see [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].		The system noise was measured and recorded at the project site before the survey started, see [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]].

	====HEADING TEST====		====HEADING TEST====
	The results of the heading test are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].		The results of the heading test are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]].

	===Altimeter calibration===		===Altimeter calibration===
	The radar altimeter was calibrated at the start of the survey. See tabulated results in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].		The radar altimeter was calibrated at the start of the survey. See tabulated results in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]].

	==Quality control of production data==		==Quality control of production data==
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	===Height control===		===Height control===
	The survey was acquired on a drape surface. The figure 'Map of the height deviation from planned drape' in Appendix 3 presents the deviation from the planned drape.		The survey was acquired on a drape surface. The figure 'Map of the height deviation from planned drape' in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 Tests and calibrations results ]] presents the deviation from the planned drape.


	[[Category:OR/14/014 Project/logistics and processing report \| 03]]		[[Category:OR/14/014 Project/logistics and processing report \| 03]]

Dbk: Protected "OR/14/014 Part 2: Survey logistics" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

2015-05-05T15:06:56Z

Protected "OR/14/014 Part 2: Survey logistics" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

← Older revision	Revision as of 16:06, 5 May 2015
(No difference)

Dbk: /* Data checking and editing */

2015-04-13T10:43:48Z

Data checking and editing

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	All acquired data were thoroughly checked at each field base prior to delivery to the Johannesburg processing centre, including checking of line and flight numbers and spike checking in all major data channels. Upon receipt of the data in Johannesburg, these procedures were repeated, beginning again from the raw (untouched) data and providing a backup check of data quality.		All acquired data were thoroughly checked at each field base prior to delivery to the Johannesburg processing centre, including checking of line and flight numbers and spike checking in all major data channels. Upon receipt of the data in Johannesburg, these procedures were repeated, beginning again from the raw (untouched) data and providing a backup check of data quality.

	The line data was checked for noise, flight path separation, height deviation, gaps and spikes using in-house CGG ATLAS software. The magnetic diurnal was checked and later corrected as described in [[OR/14/~~014 Part 3~~: ~~Data Processing~~\| Part 3: Data Processing ]].		The line data was checked for noise, flight path separation, height deviation, gaps and spikes using in-house CGG ATLAS software. The magnetic diurnal was checked and later corrected as described in [[OR/14/014_Part_3:_Data_processing \| Part 3: Data Processing ]].

	All lines passed the basic QC check.		All lines passed the basic QC check.

Dbk: /* HEADING TEST */

2015-04-13T10:43:08Z

HEADING TEST

← Older revision		Revision as of 11:43, 13 April 2015
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	====HEADING TEST====		====HEADING TEST====
	The results of the heading test are presented in Appendix 3.		The results of the heading test are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].

	===Altimeter calibration===		===Altimeter calibration===

Dbk: /* Altimeter calibration */

2015-04-13T10:42:57Z

Altimeter calibration

← Older revision		Revision as of 11:42, 13 April 2015
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	===Altimeter calibration===		===Altimeter calibration===
	The radar altimeter was calibrated at the start of the survey. See tabulated results in Appendix 3.		The radar altimeter was calibrated at the start of the survey. See tabulated results in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].

	==Quality control of production data==		==Quality control of production data==

Dbk: /* PARALLAX CONTROL */

2015-04-13T10:42:46Z

PARALLAX CONTROL

← Older revision		Revision as of 11:42, 13 April 2015
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	Before the commencement of the survey several lines were flown at standard speed and flying height in opposite directions over a suitable, well controlled magnetic anomaly to establish the parallax of the system (spatial relationship between GPS and magnetometer readings).		Before the commencement of the survey several lines were flown at standard speed and flying height in opposite directions over a suitable, well controlled magnetic anomaly to establish the parallax of the system (spatial relationship between GPS and magnetometer readings).

	The system noise was measured and recorded at the project site before the survey started, see Appendix 3.		The system noise was measured and recorded at the project site before the survey started, see [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].

	====HEADING TEST====		====HEADING TEST====

Dbk: /* MAGNETOMETER COMPENSATION (FOM) */

2015-04-13T10:42:31Z

MAGNETOMETER COMPENSATION (FOM)

← Older revision		Revision as of 11:42, 13 April 2015
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	===Magnetic tests and calibration===		===Magnetic tests and calibration===
	====MAGNETOMETER COMPENSATION (FOM)====		====MAGNETOMETER COMPENSATION (FOM)====
	The compensation procedure involved the flying, at altitude, over a magnetically quiet area, undertaking aircraft manoeuvres, rolls ± 10°, pitches ± 5° and yaws ± 5°, along headings parallel to the traverse and control line trends. A fluxgate magnetometer monitored these manoeuvre noise effects and the compensator accumulated the results. The compensator returned a Figure of Merit (FOM) value, results of which are presented in Appendix 3.		The compensation procedure involved the flying, at altitude, over a magnetically quiet area, undertaking aircraft manoeuvres, rolls ± 10°, pitches ± 5° and yaws ± 5°, along headings parallel to the traverse and control line trends. A fluxgate magnetometer monitored these manoeuvre noise effects and the compensator accumulated the results. The compensator returned a Figure of Merit (FOM) value, results of which are presented in [[OR/14/014_Appendix_3:_Tests_and_calibrations_results \| Appendix 3 ]].

	====PARALLAX CONTROL====		====PARALLAX CONTROL====