---
name: "imagery_graphical"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/imagery_graphical"
---

# imagery\_graphical(1grass)

.img-list { margin: 0; padding: 0; list-style-type: none; } .img-list li { padding: 5px; overflow: auto; } .img-list li:hover { background-color: #eee; } .img-list li a { color: initial; text-decoration: none; display: block; } .img-list li img { width: 10%; float: left; margin: 0 15px 0 0; background: white; object-fit: scale-down; } .img-list li img.default-img { max-height: 5ex; } .img-list li .desc { margin: 0px; } .img-list li .name { margin: 5px; display: block; color: #409940; font-weight: bold; font-style: italic; }

## Graphical index of GRASS GIS modules

Go to imagery introduction \| topics

### Imagery modules:

- •

  `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.signatures` `Manage imagery classification signature files`

- •

  `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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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual