SVC / GRAV
Gravity (AIRGrav)
Gravity surveying measures variations in the earth gravitational field caused by density differences below the surface. SGL offers gravity surveying with its own Airborne Inertially Referenced Gravimeter, AIRGrav, the only purpose-built airborne gravimeter currently flying commercial surveys. It can be flown in an efficient light aircraft during normal daytime conditions, and easily combined with magnetic and radiometric instruments.
Measures: density contrast
AIRGrav, in full
SVC / MAG-TF
Magnetic Total Field
Magnetic total field surveying measures variations in the earth magnetic field produced by magnetic minerals in the rocks below. It traces structure, dykes, faults and buried basement across forest, desert and water, and is routinely flown in combination with gravity and radiometric instruments to increase the survey benefits.
Measures: magnetic susceptibility
SVC / MAG-GR
Magnetic Gradient
Magnetic gradient surveying measures the rate of change of the magnetic field, sharpening the edges of magnetic bodies and resolving near surface detail that total field data alone can blur. SGL Caravans are modified to carry a triaxial magnetic gradiometer system; the current Nova Scotia survey is a magnetic gradient and radiometric program.
Measures: field gradient, triaxial
The Nova Scotia survey
SVC / EM
Electromagnetic
Electromagnetic surveying induces currents in the ground and measures the response, mapping conductive bodies and resistivity with depth. The Twin Otters can be equipped with SGFEM, SGL four frequency domain electromagnetic system, with the transmitter and receiver carried in wingtip pods.
Measures: electrical conductivity
SVC / SPEC
Gamma-ray Spectrometer
Gamma ray spectrometry measures natural radiation from potassium, uranium and thorium in the surface layer, mapping geology and alteration. SGL aircraft carry up to 63 litres of detector crystals. SGL also provides environmental monitoring services using gamma ray spectrometers and specialized processing to detect and quantify natural and anthropogenic radiation.
Measures: K / U / Th radioelements
SVC / CH4
Methane Mapping (SGMethane)
SGMethane provides accurate methane mapping and monitoring from the air, part of SGL environmental monitoring work alongside its gamma ray spectrometer services.
Measures: methane concentration
SVC / LIDAR
Scanning LiDAR
A digital elevation model (DEM) derived from SGL scanning LiDAR (Light Detection and Ranging) system, or a combination of radar and laser profiler data, is a standard product on all SGL surveys. The terrain model underpins terrain corrections and the final data products.
Product: digital elevation model
SVC / PROC
Data Processing and Interpretation
SGL offers a full range of data enhancement programs and integrated interpretation services by experienced geoscientists. Products, in digital and hard copy, include contour, colour or shaded relief maps of any parameter; NASVD processed spectrometer data; filtered line or grid products; computed depth to basement; digital terrain models; two or three dimensional modeling; cultural editing; and complete geophysical interpretative reports.
Output: maps, grids, models, reports
Papers and available data
Survey block planner
What does a grid cost in line kilometres?
Every survey starts as a block and a line spacing. Enter the block size and the spacing the target needs, and the planner returns the flying the grid requires. Tie lines and transit flying are extra, and a real quote starts with a conversation.
Enter a block to see the line kilometres.
Formula: lines = floor(block height in m / spacing in m) + 1 · line km = lines x block width in km. Worked example at the defaults: 151 lines x 40 km = 6,040 line km. See also SGL helicopters on survey in Kuwait, on the services video.
