Imagery tools
To learn more about these tool in general, go to Imagery introduction.
| Name | Description |
|---|---|
| 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 | 6S - Second Simulation of Satellite Signal in the Solar Spectrum. |
| 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 | The resulting signature file is used as input for i.maxlik, to generate an unsupervised image classification. |
| 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 | Classification is based on the spectral signature information generated by either i.cluster, g.gui.iclass, or i.gensig. |
| 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.svm.predict | Predict with a Support Vector Machine |
| i.svm.train | Train a Support Vector Machine |
| 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 | Uses red and nir bands mostly, and some indices require additional bands. |
| i.zc | Zero-crossing "edge detection" raster function for image processing. |