NAME
i.gravity - Bouguer gravity anomaly computation (full slab).
KEYWORDS
imagery,
gravity,
Bouguer,
Eotvos,
Free Air
SYNOPSIS
i.gravity
i.gravity --help
i.gravity gravity_obs=name elevation=name latitude=name flight_azimuth=name flight_velocity=name slab_density=name terrain_corr=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- gravity_obs=name [required]
- Name of the observed gravity map [mGal]
- Default: gravity_obs
- elevation=name [required]
- Name of the elevation map [m]
- Default: dem
- latitude=name [required]
- Name of the latitude map [dd.ddd]
- Default: lat
- flight_azimuth=name [required]
- Name of the flight azimuth map (clockwise from North) [dd.ddd]
- Default: flight_azimuth
- flight_velocity=name [required]
- Name of the flight velocity [kph]
- Default: flight_velocity
- slab_density=name [required]
- Name of the slab density [kg/m3]
- Default: slab_density
- terrain_corr=name [required]
- Name of the terrain correction map []
- Default: terrain_corr
- output=name [required]
- Name of the Bouguer gravity anomaly [mGal]
i.gravity calculates the Bouguer gravity anomaly (after Mussett and Khan).
Bouguer anomaly computation require:
- g_obs=observed gravity
- freeair_corr=free air correction
- bouguer_corr=bouguer correction
- terrain_corr=terrain correction
- latitude_corr=latitude correction
- eotvos_corr=eotvos correction
- International Gravity Formula (mGal), lambda=latitude (dd)
- Eotvos correction (mGal), v=velocity (kph), lambda=latitude (dd), alpha=direction of travel measured clockwise from North
- Free air Correction (mGal), h=height (m)
- Bouguer Correction (mGal), rho=density of slab (Mg/m3), h=height (m)
-
For more details on the algorithms see [1].
i.latlon
[1] Mussett, A.E. and Khan, M.A, M.A. Looking into the Earth: An Introduction to Geological Geophysics.
Yann Chemin, University of London at Birkbeck, United Kingdom.
SOURCE CODE
Available at:
i.gravity source code
(history)
Latest change: Monday Jan 30 19:52:26 2023 in commit: cac8d9d848299297977d1315b7e90cc3f7698730
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual