i.feotio2 - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

NAME

i.feotio2 - Calculates the FeO or TiO2 contents from the Clementine project Moon data.

KEYWORDS

imagery, Moon, Clementine, Chandrayaan1, UVVIS, M3, FeO, TiO2, reflectance

SYNOPSIS

i.feotio2

i.feotio2 --help

i.feotio2 [-t] band0=name band1=name output=name [param0=float] [param1=float] eqname=type [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-t: TiO2 (refl@415, refl@750 & y0Ti, s0Ti)
--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:

band0=name [required]: reflectance band at 750 nm (UVVIS 2, M3 9)
band1=name [required]: reflectance band at 950 nm (UVVIS 4 for FeO/OMAT, M3 19) or at 415 nm (UVVIS 1 for TiO2)
output=name [required]: Name for output raster map
param0=float: Value of theta (FeO) or y0Ti (TiO2)
param1=float: Value of s0Ti (TiO2)
eqname=type [required]: Type of equation; Options: feolucey2000, feolawrence2002, feowilcox2005_setparam, feowilcox2005, feozhang2013, omatlucey2000, omatwilcox2005, tio2lucey2000_setparam, tio2lucey2000; Default: feolucey2000; feolucey2000: FeO (Lucey et al., 2000); feolawrence2002: FeO (lawrence et al., 2002); feowilcox2005_setparam: FeO (Wilcox et al., 2005) set parameter theta; feowilcox2005: FeO (Wilcox et al., 2005); feozhang2013: FeO (Zhang et al., 2013); omatlucey2000: OMAT (Lucey et al., 2000); omatwilcox2005: OMAT (Wilcox et al., 2005); tio2lucey2000_setparam: TiO2 (Lucey et al., 2000) set parameters; tio2lucey2000: TiO2 (Lucey et al., 2000)

DESCRIPTION
NOTES
REFERENCES
AUTHORS

DESCRIPTION

i.feo_tio2 calculates the FeO or TiO2 contents from Clementine data. Clementine UVVIS sensor has five bands, UVVIS1 = 415, UVVIS2 = 750, UVVIS3 = 900, UVVIS4 = 950 and UVVIS5 = 1000 nm.

wt%TiO2 = 3.708 arctan ((R415/R750)-y0Ti)/(R750-s0Ti) (1)

wt%FeO = -137.97 ( R750 sin(theta) + (R950/R750) cos(theta) ) + 57.46	(2)

with theta = 1.3885 rad, the 'average slope of the trends in the mare' from Wilcox et al (2005). Map-a-Planet Explorer mentions this set of equations:

double feolucey2000(double uvvis2, double uvvis4){
	 //\cite{lucey2000lunar}
	 return(17.427*(-atan2f(((uvvis4/uvvis2)-1.19)/(uvvis2-0.08)))-7.565);
}

double feolawrence2002(double uvvis2, double uvvis4){
	 //\cite{lawrence2002iron} 
	 return(5.7*((-0.147+0.372*(-(uvvis4/uvvis2-1.22)/(uvvis2-0.04))+(-0.036)*pow((-(uvvis4/uvvis2-1.22)/(uvvis2-0.04)),2)))+2.15);
}

double feowilcox2005(double uvvis2, double uvvis4){
	  //\cite{wilcox2005mapping}  
	  return(-137.97*((uvvis2*0.9834)+(uvvis4/uvvis2*0.1813))+57.46);
}

double omatlucey2000(double uvvis2, double uvvis4){
	 //\cite{lucey2000lunar}
	 return(sqrtf(pow((uvvis2-0.08),2)+pow(((uvvis4/uvvis2)-1.19),2)));
}

double omatwilcox2005(double uvvis2, double uvvis4){
	 //\cite{wilcox2005mapping}
	 return((uvvis2*0.1813)-((uvvis4/uvvis2)*0.9834));
}

double tio2lucey2000(double uvvis1, double uvvis2){
	 //\cite{lucey2000lunar}
	 return(3.708*pow((atan2f(((uvvis1/uvvis2)-0.42)/(uvvis2-0.0))),5.979));
}

REFERENCES

(1) Lucey, P.G., Blewett, D.T., Jolliff, B.L., 2000. Lunar iron and titanium abundance algorithms based on final processing of Clementine ultraviolet-visible images. J. Geophys. Res. 105(E8): 20297-20305. (2) Wilcox, B.B., Lucey, P.G., Gillis, J.J., 2005. Mapping iron in the lunar mare: An improved approach. J. Geophys. Res. 110(E11):2156-2202. (3) Lawrence, DJ and Feldman, WC and Elphic, RC and Little, RC and Prettyman, TH and Maurice, S and Lucey, PG and Binder, AB, 2002. Iron abundances on the lunar surface as measured by the Lunar Prospector gamma-ray and neutron spectrometers. Journal of Geophysical Research: Planets (1991--2012), 107(E12):13-1.

AUTHORS

Yann Chemin (B.Sc. student), Birkbeck, University of London.

SOURCE CODE

Available at: i.feotio2 source code (history)

Latest change: Monday Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55