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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="">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.
            |      | 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
            |      | Import of SPOT VGT NDVI file into a raster map
            |  i.landsat.acca     |  Performs  Landsat  TM/ETM+  Automatic Cloud Cover Assessment
            | 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
            |     | Menu driver for the photo imagery programs.
            | i.pca   | Principal components analysis (PCA) for image processing.
            |    | Interactively mark fiducial or reseau points on an image.
            |   | Creates control points on an image to be ortho-rectified.
            |     |  Interactively  select  and  modify  the imagery group camera
       reference file.
            |      | Interactively creates or modifies entries in a  camera  initial
       exposure station file for imagery group referenced by a sub-block.
            |   | 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
            |     | 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