1imagery(1) GRASS GIS User's Manual imagery(1)
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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.
12 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
17 Go back to help overview
19 Imagery commands:
21 i.albedo Computes broad band albedo from surface reflectance.
22 i.aster.toar Calculates Top of Atmosphere Radiance/Reflectance/Brightness
24 Temperature from ASTER DN.
25 i.atcorr Performs atmospheric correction using the 6S algorithm.
27 i.band.library Prints available semantic label information used for multi‐
29 spectral data.
30 i.biomass Computes biomass growth, precursor of crop yield calcula‐
32 tion.
33 i.cca Canonical components analysis (CCA) program for image pro‐
35 cessing.
36 i.cluster Generates spectral signatures for land cover types in an im‐
38 age using a clustering algorithm.
39 i.colors.enhance Performs auto-balancing of colors for RGB images.
41 i.eb.eta Actual evapotranspiration for diurnal period (Bastiaanssen,
43 1995).
44 i.eb.evapfr Computes evaporative fraction and root zone soil moisture.
46 i.eb.hsebal01 Computes sensible heat flux iteration SEBAL 01.
48 i.eb.netrad Net radiation approximation (Bastiaanssen, 1995).
50 i.eb.soilheatflux Soil heat flux approximation (Bastiaanssen, 1995).
52 i.emissivity Computes emissivity from NDVI, generic method for sparse
54 land.
55 i.evapo.mh Computes evapotranspiration calculation modified or original
57 Hargreaves formulation, 2001.
58 i.evapo.pm Computes potential evapotranspiration calculation with
60 hourly Penman-Monteith.
61 i.evapo.pt Computes evapotranspiration calculation Priestley and Taylor
63 formulation, 1972.
64 i.evapo.time Computes temporal integration of satellite ET actual (ETa)
69 following the daily ET reference (ETo) from meteorological
70 station(s).
71 i.fft Fast Fourier Transform (FFT) for image processing.
73 i.gensig Generates statistics for i.maxlik from raster map.
75 i.gensigset Generates statistics for i.smap from raster map.
77 i.group Creates, edits, and lists groups of imagery data.
79 i.his.rgb Transforms raster maps from HIS (Hue-Intensity-Saturation)
81 color space to RGB (Red-Green-Blue) color space.
82 i.ifft Inverse Fast Fourier Transform (IFFT) for image processing.
84 i.image.mosaic Mosaics several images and extends colormap.
86 i.in.spotvgt Imports SPOT VGT NDVI data into a raster map.
88 i.landsat.acca Performs Landsat TM/ETM+ Automatic Cloud Cover Assessment
90 (ACCA).
91 i.landsat.toar Calculates top-of-atmosphere radiance or reflectance and
93 temperature for Landsat MSS/TM/ETM+/OLI
94 i.maxlik Classifies the cell spectral reflectances in imagery data.
96 i.modis.qc Extracts quality control parameters from MODIS QC layers.
98 i.oif Calculates Optimum-Index-Factor table for spectral bands
100 i.ortho.camera Select and modify the imagery group camera reference file.
102 i.ortho.elev Select or modify the target elevation model.
104 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.
108 i.ortho.photo Menu driver for the photo imagery programs.
110 i.ortho.rectify Orthorectifies an image by using the image to photo coordi‐
112 nate transformation matrix.
113 i.ortho.target Select or modify the imagery group target.
115 i.ortho.transform Computes a coordinate transformation based on the control
117 points.
118 i.pansharpen Image fusion algorithms to sharpen multispectral with
120 high-res panchromatic channels
121 i.pca Principal components analysis (PCA) for image processing.
123 i.rectify Rectifies an image by computing a coordinate transformation
125 for each pixel in the image based on the control points.
126 i.rgb.his Transforms raster maps from RGB (Red-Green-Blue) color space
128 to HIS (Hue-Intensity-Saturation) color space.
129 i.segment Identifies segments (objects) from imagery data.
131 i.smap Performs contextual image classification using sequential
135 maximum a posteriori (SMAP) estimation.
136 i.spectral Displays spectral response at user specified locations in
138 group or images.
139 i.target Targets an imagery group to a GRASS location and mapset.
141 i.tasscap Performs Tasseled Cap (Kauth Thomas) transformation.
143 i.topo.corr Computes topographic correction of reflectance.
145 i.vi Calculates different types of vegetation indices.
147 i.zc Zero-crossing "edge detection" raster function for image
149 processing.
150 Main index | Topics index | Keywords index | Graphical index | Full in‐
153 dex
154 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
156GRASS 8.3.1 imagery(1)