Ubuntu Manpage: Go to imagery introduction

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Graphical index of GRASS GIS modules

Go to imagery introduction | topics

Imagery modules:
• 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 Performs atmospheric correction using the 6S algorithm.

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

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

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

• 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 Classifies the cell spectral reflectances in imagery data.

• 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.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.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 Calculates different types of vegetation indices.

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

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