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Imagery tools

• i.albedo Computes broad band albedo from surface reflectance.
• i.aster.toar Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN.
• i.atcorr 6S - Second Simulation of Satellite Signal in the Solar Spectrum.
• i.band.library Prints available semantic label information used for multispectral data.
• i.biomass Computes biomass growth, precursor of crop yield calculation.
• i.cca Canonical components analysis (CCA) program for image processing.
• i.cluster The resulting signature file is used as input for i.maxlik, to generate an unsupervised image classification.
• i.colors.enhance Performs auto-balancing of colors for RGB images.
• i.eb.eta Actual evapotranspiration for diurnal period (Bastiaanssen, 1995).
• i.eb.evapfr Computes evaporative fraction and root zone soil moisture.
• i.eb.hsebal01 Computes sensible heat flux iteration SEBAL 01.
• i.eb.netrad Net radiation approximation (Bastiaanssen, 1995).
• i.eb.soilheatflux Soil heat flux approximation (Bastiaanssen, 1995).
• i.emissivity Computes emissivity from NDVI, generic method for sparse land.
• i.evapo.mh Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.
• i.evapo.pm Computes potential evapotranspiration calculation with hourly Penman-Monteith.
• i.evapo.pt Computes evapotranspiration calculation Priestley and Taylor formulation, 1972.
• i.evapo.time Computes temporal integration of satellite ET actual (ETa) following the daily ET reference (ETo) from meteorological station(s).
• i.fft Fast Fourier Transform (FFT) for image processing.
• i.gensig Generates statistics for i.maxlik from raster map.
• i.gensigset Generates statistics for i.smap from raster map.
• i.group Creates, edits, and lists groups of imagery data.
• i.his.rgb Transforms raster maps from HIS (Hue-Intensity-Saturation) color space to RGB (Red-Green-Blue) color space.
• i.ifft Inverse Fast Fourier Transform (IFFT) for image processing.
• i.image.mosaic Mosaics several images and extends colormap.
• i.in.spotvgt Imports SPOT VGT NDVI data into a raster map.
• i.landsat.acca Performs Landsat TM/ETM+ Automatic Cloud Cover Assessment (ACCA).
• i.landsat.toar Calculates top-of-atmosphere radiance or reflectance and temperature for Landsat MSS/TM/ETM+/OLI
• i.maxlik Classification is based on the spectral signature information generated by either i.cluster, g.gui.iclass, or i.gensig.
• i.modis.qc Extracts quality control parameters from MODIS QC layers.
• i.oif Calculates Optimum-Index-Factor table for spectral bands
• i.ortho.camera Select and modify the imagery group camera reference file.
• i.ortho.elev Select or modify the target elevation model.
• i.ortho.init Interactively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.
• i.ortho.photo Menu driver for the photo imagery programs.
• i.ortho.rectify Orthorectifies an image by using the image to photo coordinate transformation matrix.
• i.ortho.target Select or modify the imagery group target.
• i.ortho.transform Computes a coordinate transformation based on the control points.
• i.pansharpen Image fusion algorithms to sharpen multispectral with high-res panchromatic channels
• i.pca Principal components analysis (PCA) for image processing.
• i.rectify Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points.
• i.rgb.his Transforms raster maps from RGB (Red-Green-Blue) color space to HIS (Hue-Intensity-Saturation) color space.
• i.segment Identifies segments (objects) from imagery data.
• i.signatures Manage imagery classification signature files
• i.smap Performs contextual image classification using sequential maximum a posteriori (SMAP) estimation.
• i.spectral Displays spectral response at user specified locations in group or images.
• i.svm.predict Predict with a Support Vector Machine
• i.svm.train Train a Support Vector Machine
• i.target Targets an imagery group to a GRASS location and mapset.
• i.tasscap Performs Tasseled Cap (Kauth Thomas) transformation.
• i.topo.corr Computes topographic correction of reflectance.
• i.vi Uses red and nir bands mostly, and some indices require additional bands.
• i.zc Zero-crossing "edge detection" raster function for image processing.