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GRASS GIS 8.3.0 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

       Go back to help overview

   Imagery commands:
       i.albedo                                                     Computes broad band albedo from surface reflectance.

       i.aster.toar                                                 Calculates Top of Atmosphere Radiance/Reflectance/Brightness
                                                                    Temperature from ASTER DN.

       i.atcorr                                                     Performs atmospheric correction using the 6S algorithm.

       i.band.library                                               Prints  available  semantic  label  information   used   for
                                                                    multispectral data.

       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.colors.enhance                                             Performs auto-balancing of colors for RGB images.

       i.eb.eta                                                     Actual evapotranspiration for diurnal period  (Bastiaanssen,
                                                                    1995).

       i.eb.evapfr                                                  Computes evaporative fraction and root zone soil moisture.

       i.eb.hsebal01                                                Computes sensible heat flux iteration SEBAL 01.

       i.eb.netrad                                                  Net radiation approximation (Bastiaanssen, 1995).

       i.eb.soilheatflux                                            Soil heat flux approximation (Bastiaanssen, 1995).

       i.emissivity                                                 Computes  emissivity  from  NDVI,  generic method for sparse
                                                                    land.

       i.evapo.mh                                                   Computes evapotranspiration calculation modified or original
                                                                    Hargreaves formulation, 2001.

       i.evapo.pm                                                   Computes   potential   evapotranspiration  calculation  with
                                                                    hourly Penman-Monteith.

       i.evapo.pt                                                   Computes evapotranspiration calculation Priestley and Taylor
                                                                    formulation, 1972.

       i.evapo.time                                                 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.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 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 several images and extends colormap.

       i.in.spotvgt                                                 Imports SPOT VGT NDVI data into a raster map.

       i.landsat.acca                                               Performs Landsat TM/ETM+ Automatic  Cloud  Cover  Assessment
                                                                    (ACCA).

       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 spectral bands

       i.ortho.camera                                               Select and modify the imagery group camera reference file.

       i.ortho.elev                                                 Select or modify the target elevation model.

       i.ortho.init                                                 Interactively  creates  or  modifies  entries  in  a  camera
                                                                    initial  exposure  station file for imagery group referenced
                                                                    by a sub-block.

       i.ortho.photo                                                Menu driver for the photo imagery programs.

       i.ortho.rectify                                              Orthorectifies  an  image  by  using  the  image  to   photo
                                                                    coordinate transformation matrix.

       i.ortho.target                                               Select or modify the imagery group target.

       i.ortho.transform                                            Computes  a  coordinate  transformation based on the control
                                                                    points.

       i.pansharpen                                                 Image  fusion  algorithms  to  sharpen  multispectral   with
                                                                    high-res panchromatic channels

       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.segment                                                    Identifies segments (objects) from imagery data.

       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                                                    Performs Tasseled Cap (Kauth Thomas) transformation.

       i.topo.corr                                                  Computes topographic correction of reflectance.

       i.vi                                                         Calculates different types of vegetation indices.

       i.zc                                                         Zero-crossing  "edge  detection"  raster  function for image
                                                                    processing.

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       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual