## GRASS GIS 6.4.4 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 GPL'ed), image processing and geographic information system (GIS).

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imagery commands:

i.atcorr | Performs atmospheric correction using the 6S algorithm.
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.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 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 up to 4 images and extends colormap; creates map *.mosaic
i.in.spotvgt | Import of SPOT VGT NDVI file into a raster map
i.landsat.acca | Performs Landsat TM/ETM+ Automatic Cloud Cover Assessment (ACCA).
i.landsat.rgb | Performs auto-balancing of colors for LANDSAT images.
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 LANDSAT TM bands 1-5, & 7
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.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 | Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data
i.topo.corr | Computes topographic correction of reflectance.
i.zc | Zero-crossing "edge detection" raster function for image processing.

Help Index | Full Index
© 2003-2014 GRASS Development Team, GRASS GIS 6.4.4 Reference Manual