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GRASS GIS 6.4.3 Reference Manual
Geographic Resources Analysis Support System, commonly referred to as GRASS, is a <a
href="http://en.wikipedia.org/wiki/Geographic_information_system">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). Go to imagery introduction
Go back to help overview
imagery commands:
| i.atcorr | Performs atmospheric correction using the 6S algorithm.
| i.cca | Canonical components analysis (cca) program for image processing.
| i.class | Generates spectral signatures for an image by allowing the user to
outline regions of interest.
| 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 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 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+.
| 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.ortho.photo | Menu driver for the photo imagery programs.
| i.pca | Principal components analysis (PCA) for image processing.
| i.photo.2image | Interactively mark fiducial or reseau points on an image.
| i.photo.2target | Creates control points on an image to be ortho-rectified.
| i.photo.camera | Interactively select and modify the imagery group camera
reference file.
| i.photo.init | Interactively creates or modifies entries in a camera initial
exposure station file for imagery group referenced by a sub-block.
| i.photo.rectify | Orthorectifies an image by using the image to photo coordinate
transformation matrix.
| i.points | Mark ground control points on image to be rectified.
| 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.vpoints | Set registration points for an imagery group from a vector map or
keyboard entry.
| i.zc | Zero-crossing "edge detection" raster function for image processing.
Full Index
© 2003-2013 GRASS Development Team, GRASS GIS 6.4.3 Reference Manual