imagery_graphical -

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i.albedo Computes broad band albedo from surface reflectance.

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i.aster.toar Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN.

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i.atcorr Performs atmospheric correction using the 6S algorithm.

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i.band.library Prints available semantic label information used for multispectral data.

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i.biomass Computes biomass growth, precursor of crop yield calculation.

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i.cca Canonical components analysis (CCA) program for image processing.

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i.cluster Generates spectral signatures for land cover types in an image using a clustering algorithm.

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i.colors.enhance Performs auto−balancing of colors for RGB images.

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i.eb.eta Actual evapotranspiration for diurnal period (Bastiaanssen, 1995).

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i.eb.evapfr Computes evaporative fraction and root zone soil moisture.

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i.eb.hsebal01 Computes sensible heat flux iteration SEBAL 01.

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i.eb.netrad Net radiation approximation (Bastiaanssen, 1995).

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i.eb.soilheatflux Soil heat flux approximation (Bastiaanssen, 1995).

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i.emissivity Computes emissivity from NDVI, generic method for sparse land.

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i.evapo.mh Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.

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i.evapo.pm Computes potential evapotranspiration calculation with hourly Penman−Monteith.

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i.evapo.pt Computes evapotranspiration calculation Priestley and Taylor formulation, 1972.

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i.evapo.time Computes temporal integration of satellite ET actual (ETa) following the daily ET reference (ETo) from meteorological station(s).

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i.fft Fast Fourier Transform (FFT) for image processing.

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i.gensig Generates statistics for i.maxlik from raster map.

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i.gensigset Generates statistics for i.smap from raster map.

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i.group Creates, edits, and lists groups of imagery data.

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i.his.rgb Transforms raster maps from HIS (Hue−Intensity−Saturation) color space to RGB (Red−Green−Blue) color space.

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i.ifft Inverse Fast Fourier Transform (IFFT) for image processing.

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i.image.mosaic Mosaics several images and extends colormap.

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i.in.spotvgt Imports SPOT VGT NDVI data into a raster map.

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i.landsat.acca Performs Landsat TM/ETM+ Automatic Cloud Cover Assessment (ACCA).

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i.landsat.toar Calculates top−of−atmosphere radiance or reflectance and temperature for Landsat MSS/TM/ETM+/OLI

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i.maxlik Classifies the cell spectral reflectances in imagery data.

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i.modis.qc Extracts quality control parameters from MODIS QC layers.

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i.oif Calculates Optimum−Index−Factor table for spectral bands

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i.ortho.camera Select and modify the imagery group camera reference file.

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i.ortho.elev Select or modify the target elevation model.

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i.ortho.init Interactively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub−block.

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i.ortho.photo Menu driver for the photo imagery programs.

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i.ortho.rectify Orthorectifies an image by using the image to photo coordinate transformation matrix.

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i.ortho.target Select or modify the imagery group target.

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i.ortho.transform Computes a coordinate transformation based on the control points.

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i.pansharpen Image fusion algorithms to sharpen multispectral with high−res panchromatic channels

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i.pca Principal components analysis (PCA) for image processing.

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i.rectify Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points.

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i.rgb.his Transforms raster maps from RGB (Red−Green−Blue) color space to HIS (Hue−Intensity−Saturation) color space.

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i.segment Identifies segments (objects) from imagery data.

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i.signatures Manage imagery classification signature files

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i.smap Performs contextual image classification using sequential maximum a posteriori (SMAP) estimation.

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i.spectral Displays spectral response at user specified locations in group or images.

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i.target Targets an imagery group to a GRASS location and mapset.

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i.tasscap Performs Tasseled Cap (Kauth Thomas) transformation.

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i.topo.corr Computes topographic correction of reflectance.

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i.vi Calculates different types of vegetation indices.

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i.zc Zero−crossing "edge detection" raster function for image processing.