GRASS GIS manual: i.gravity

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]

DESCRIPTION
NOTES
SEE ALSO
REFERENCES
AUTHORS

DESCRIPTION

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

NOTES

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].

REFERENCES

[1] Mussett, A.E. and Khan, M.A, M.A. Looking into the Earth: An Introduction to Geological Geophysics.

AUTHORS

Yann Chemin, University of London at Birkbeck, United Kingdom.

Last changed: $Date: 2013-02-12 21:52:30 +0100 (Tue, 12 Feb 2013) $

SOURCE CODE

Available at: i.gravity source code (history)