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GRASS GIS 7.0.svn Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS, 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).

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imagery commands:
i.albedo Broad Band Albedo from Surface Reflectance.
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.eb.eta actual evapotranspiration for diurnal period (Bastiaanssen, 1995)
i.eb.evapfr Computes evaporative fraction (Bastiaanssen, 1995) and root zone soil moisture (Makin, Molden and Bastiaanssen, 2001)
i.eb.h_SEBAL01
i.eb.soilheatflux Soil heat flux approximation (Bastiaanssen, 1995)
i.emissivity Emissivity from NDVI, generic method for spares land.
i.evapo.time_integration 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.fusion.brovey Brovey transform to merge multispectral and high-res panchromatic channels
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 and subgroups of imagery files.
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 Import of SPOT VGT NDVI file into a raster map
i.landsat.rgb Performs auto-balancing of colors for LANDSAT images.
i.latlong creates a latitude/longitude map
i.maxlik Classifies the cell spectral reflectances in imagery data.
i.modis.qc Extract quality control parameters from Modis QC layers
i.oif Calculates Optimum-Index-Factor table for LANDSAT TM bands 1-5, & 7
i.pca Principal components analysis (pca) program 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.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.sunhours creates a sunshine hours map
i.target Targets an imagery group to a GRASS location and mapset.
i.tasscap Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data
i.vi Calculates different types of vegetation indices.
i.zc Zero-crossing "edge detection" raster function for image processing.



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