1imagery(1)                  GRASS GIS User's Manual                 imagery(1)
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GRASS GIS 8.3.1 Reference Manual

6       Geographic  Resources  Analysis Support System, commonly referred to as
7       GRASS GIS, is a Geographic Information System (GIS) used for geospatial
8       data  management  and analysis, image processing, graphics/maps produc‐
9       tion, spatial modeling, and visualization. GRASS is currently  used  in
10       academic  and  commercial settings around the world, as well as by many
11       governmental agencies and environmental consulting companies.
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13       This reference manual details the use of modules distributed with  Geo‐
14       graphic  Resources Analysis Support System (GRASS), an open source (GNU
15       GPLed), image processing and geographic information system  (GIS).   Go
16       to imagery introduction | topics
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18       Go back to help overview
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20   Imagery commands:
21       i.albedo                                                     Computes broad band albedo from surface reflectance.
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23       i.aster.toar                                                 Calculates Top of Atmosphere Radiance/Reflectance/Brightness
24                                                                    Temperature from ASTER DN.
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26       i.atcorr                                                     Performs atmospheric correction using the 6S algorithm.
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28       i.band.library                                               Prints available semantic label information used for  multi‐
29                                                                    spectral data.
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31       i.biomass                                                    Computes  biomass  growth,  precursor of crop yield calcula‐
32                                                                    tion.
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34       i.cca                                                        Canonical components analysis (CCA) program for  image  pro‐
35                                                                    cessing.
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37       i.cluster                                                    Generates spectral signatures for land cover types in an im‐
38                                                                    age using a clustering algorithm.
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40       i.colors.enhance                                             Performs auto-balancing of colors for RGB images.
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42       i.eb.eta                                                     Actual evapotranspiration for diurnal period  (Bastiaanssen,
43                                                                    1995).
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45       i.eb.evapfr                                                  Computes evaporative fraction and root zone soil moisture.
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47       i.eb.hsebal01                                                Computes sensible heat flux iteration SEBAL 01.
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49       i.eb.netrad                                                  Net radiation approximation (Bastiaanssen, 1995).
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51       i.eb.soilheatflux                                            Soil heat flux approximation (Bastiaanssen, 1995).
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53       i.emissivity                                                 Computes  emissivity  from  NDVI,  generic method for sparse
54                                                                    land.
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56       i.evapo.mh                                                   Computes evapotranspiration calculation modified or original
57                                                                    Hargreaves formulation, 2001.
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59       i.evapo.pm                                                   Computes   potential   evapotranspiration  calculation  with
60                                                                    hourly Penman-Monteith.
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62       i.evapo.pt                                                   Computes evapotranspiration calculation Priestley and Taylor
63                                                                    formulation, 1972.
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68       i.evapo.time                                                 Computes  temporal  integration of satellite ET actual (ETa)
69                                                                    following the daily ET reference (ETo)  from  meteorological
70                                                                    station(s).
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72       i.fft                                                        Fast Fourier Transform (FFT) for image processing.
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74       i.gensig                                                     Generates statistics for i.maxlik from raster map.
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76       i.gensigset                                                  Generates statistics for i.smap from raster map.
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78       i.group                                                      Creates, edits, and lists groups of imagery data.
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80       i.his.rgb                                                    Transforms  raster  maps from HIS (Hue-Intensity-Saturation)
81                                                                    color space to RGB (Red-Green-Blue) color space.
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83       i.ifft                                                       Inverse Fast Fourier Transform (IFFT) for image processing.
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85       i.image.mosaic                                               Mosaics several images and extends colormap.
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87       i.in.spotvgt                                                 Imports SPOT VGT NDVI data into a raster map.
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89       i.landsat.acca                                               Performs Landsat TM/ETM+ Automatic  Cloud  Cover  Assessment
90                                                                    (ACCA).
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92       i.landsat.toar                                               Calculates  top-of-atmosphere  radiance  or  reflectance and
93                                                                    temperature for Landsat MSS/TM/ETM+/OLI
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95       i.maxlik                                                     Classifies the cell spectral reflectances in imagery data.
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97       i.modis.qc                                                   Extracts quality control parameters from MODIS QC layers.
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99       i.oif                                                        Calculates Optimum-Index-Factor table for spectral bands
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101       i.ortho.camera                                               Select and modify the imagery group camera reference file.
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103       i.ortho.elev                                                 Select or modify the target elevation model.
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105       i.ortho.init                                                 Interactively creates or modifies entries in a  camera  ini‐
106                                                                    tial exposure station file for imagery group referenced by a
107                                                                    sub-block.
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109       i.ortho.photo                                                Menu driver for the photo imagery programs.
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111       i.ortho.rectify                                              Orthorectifies an image by using the image to photo  coordi‐
112                                                                    nate transformation matrix.
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114       i.ortho.target                                               Select or modify the imagery group target.
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116       i.ortho.transform                                            Computes  a  coordinate  transformation based on the control
117                                                                    points.
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119       i.pansharpen                                                 Image  fusion  algorithms  to  sharpen  multispectral   with
120                                                                    high-res panchromatic channels
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122       i.pca                                                        Principal components analysis (PCA) for image processing.
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124       i.rectify                                                    Rectifies  an image by computing a coordinate transformation
125                                                                    for each pixel in the image based on the control points.
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127       i.rgb.his                                                    Transforms raster maps from RGB (Red-Green-Blue) color space
128                                                                    to HIS (Hue-Intensity-Saturation) color space.
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130       i.segment                                                    Identifies segments (objects) from imagery data.
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134       i.smap                                                       Performs  contextual  image  classification using sequential
135                                                                    maximum a posteriori (SMAP) estimation.
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137       i.spectral                                                   Displays spectral response at user  specified  locations  in
138                                                                    group or images.
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140       i.target                                                     Targets an imagery group to a GRASS location and mapset.
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142       i.tasscap                                                    Performs Tasseled Cap (Kauth Thomas) transformation.
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144       i.topo.corr                                                  Computes topographic correction of reflectance.
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146       i.vi                                                         Calculates different types of vegetation indices.
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148       i.zc                                                         Zero-crossing  "edge  detection"  raster  function for image
149                                                                    processing.
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152       Main index | Topics index | Keywords index | Graphical index | Full in‐
153       dex
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155       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
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159GRASS 8.3.1                                                         imagery(1)
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