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GRASS GIS 8.3.2 Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.

This reference manual details the use of modules distributed with Geographic Resources Analysis Support System (GRASS), an open source (GNU GPLed), image processing and geographic information system (GIS). Go to imagery introduction | topics

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Imagery commands

i.albedoComputes broad band albedo from surface reflectance.
i.aster.toarCalculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN.
i.atcorrPerforms atmospheric correction using the 6S algorithm. available semantic label information used for multispectral data.
i.biomassComputes biomass growth, precursor of crop yield calculation.
i.ccaCanonical components analysis (CCA) program for image processing.
i.clusterGenerates spectral signatures for land cover types in an image using a clustering algorithm.
i.colors.enhancePerforms auto-balancing of colors for RGB images.
i.eb.etaActual evapotranspiration for diurnal period (Bastiaanssen, 1995).
i.eb.evapfrComputes evaporative fraction and root zone soil moisture.
i.eb.hsebal01Computes sensible heat flux iteration SEBAL 01.
i.eb.netradNet radiation approximation (Bastiaanssen, 1995).
i.eb.soilheatfluxSoil heat flux approximation (Bastiaanssen, 1995).
i.emissivityComputes emissivity from NDVI, generic method for sparse land.
i.evapo.mhComputes evapotranspiration calculation modified or original Hargreaves formulation, 2001.
i.evapo.pmComputes potential evapotranspiration calculation with hourly Penman-Monteith.
i.evapo.ptComputes evapotranspiration calculation Priestley and Taylor formulation, 1972.
i.evapo.timeComputes temporal integration of satellite ET actual (ETa) following the daily ET reference (ETo) from meteorological station(s).
i.fftFast Fourier Transform (FFT) for image processing.
i.gensigGenerates statistics for i.maxlik from raster map.
i.gensigsetGenerates statistics for i.smap from raster map.
i.groupCreates, edits, and lists groups of imagery data.
i.his.rgbTransforms raster maps from HIS (Hue-Intensity-Saturation) color space to RGB (Red-Green-Blue) color space.
i.ifftInverse Fast Fourier Transform (IFFT) for image processing.
i.image.mosaicMosaics several images and extends colormap. SPOT VGT NDVI data into a raster map.
i.landsat.accaPerforms Landsat TM/ETM+ Automatic Cloud Cover Assessment (ACCA).
i.landsat.toarCalculates top-of-atmosphere radiance or reflectance and temperature for Landsat MSS/TM/ETM+/OLI
i.maxlikClassifies the cell spectral reflectances in imagery data.
i.modis.qcExtracts quality control parameters from MODIS QC layers.
i.oifCalculates Optimum-Index-Factor table for spectral bands
i.ortho.cameraSelect and modify the imagery group camera reference file.
i.ortho.elevSelect or modify the target elevation model.
i.ortho.initInteractively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.
i.ortho.photoMenu driver for the photo imagery programs.
i.ortho.rectifyOrthorectifies an image by using the image to photo coordinate transformation matrix.
i.ortho.targetSelect or modify the imagery group target.
i.ortho.transformComputes a coordinate transformation based on the control points.
i.pansharpenImage fusion algorithms to sharpen multispectral with high-res panchromatic channels
i.pcaPrincipal components analysis (PCA) for image processing.
i.rectifyRectifies an image by computing a coordinate transformation for each pixel in the image based on the control points.
i.rgb.hisTransforms raster maps from RGB (Red-Green-Blue) color space to HIS (Hue-Intensity-Saturation) color space.
i.segmentIdentifies segments (objects) from imagery data.
i.smapPerforms contextual image classification using sequential maximum a posteriori (SMAP) estimation.
i.spectralDisplays spectral response at user specified locations in group or images.
i.targetTargets an imagery group to a GRASS location and mapset.
i.tasscapPerforms Tasseled Cap (Kauth Thomas) transformation.
i.topo.corrComputes topographic correction of reflectance.
i.viCalculates different types of vegetation indices.
i.zcZero-crossing "edge detection" raster function for image processing.

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