GRASS GIS 5.7 Reference Manual
This reference manual details the use of modules distributed with
Geographic Resources Analysis Support System (GRASS), an open source (GNU
GPL'ed), image processing and geographic information system (GIS).
imagery commands:
- i.cca - Canonical components analysis (cca) program for image processing.
- i.class -
- i.cluster - An imagery function that generates spectral signatures for land cover types in an image using a clustering algorithm. The resulting signature file is used as input for i.maxlik, to generate an unsupervised image classification.
- i.fft - Fast Fourier Transform (FFT) for image processing.
- i.fusion.brovey - Brovey transform to merge multispectral and high-res panchromatic channels
- i.gensig - Generates statistics for i.maxlik from raster map layer.
- i.gensigset - Generate statistics for i.smap from raster map layer.
- i.group - An imagery function that creates and edits groups and subgroups of imagery files. The interactive version provides extended functionality.
- i.his.rgb - Hue-intensity-saturation (his) to red-green-blue (rgb) raster map color transformation function.
- i.ifft - Inverse Fast Fourier Transform (ifft) for image processing.
- i.maxlik - An imagery function that classifies the cell spectral reflectances in imagery data based on the spectral signature information generated by either i.cluster, i.class, or i.gensig.
- i.ortho.photo -
- i.pca - Principal components analysis (pca) program for image processing.
- i.points -
- i.rectify - Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points
- i.rgb.his - Red-green-blue (rgb) to hue-intensity-saturation (his) raster map color transformation function.
- i.smap - An imagery function that performs contextual image classification using sequential maximum a posteriori (SMAP) estimation.
- i.spectral - i.spectral - displays spectral response at user specifified locations in images
- i.target - This program targets an imagery group to a GRASS location and mapset
- i.tasscap - i.tasscap - Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data
- i.zc - Zero-crossing "edge detection" raster function for image processing.
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