L4E_differential_measurements

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geological survey
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geological survey

low altitudes
uav swarm
coarse scan
differential measure
monitoring subsidence
whale watching
gravity measurements
magsurvey
georanger
geosurvey ip

Differential measurements

differential tensor gravity
differential magnetic field
differential thermal imaging
differential hyperspectral imaging
differential precision LIDAR
differential Interferometric SAR

information can be derived from measurements performed at regular time intervals (for example, each day) at the same time of day, to aid in the detection of changes, such as:

(onset of) oil leakage from a pipeline (through differential thermal imaging, or, differential gas analysis)
detection and monitoring of surface subsidence, for example, as a result of extracting oil and gas (through differential LIDAR, or, differential Interferometric Synthetic Aperture RADAR)
depletion of an oil well over time (through differential tensor gravity)

to detect		use
leakage from a buried pipeline		differential thermal imaging
depletion of an oil reservoir		differential gravity
ground deformation following gas extraction		differential Interferometric SAR
depletion of a mineral deposit		differential magnetic
leakage of gas from a pipeline		differential hyperspectral imaging

Following a suggestion by Tara Schiek at Shell International E & P