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.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 | i.fusion.brovey |
i.gensig | Generates statistics for i.maxlik from raster map layer. |
i.gensigset | Generate statistics for i.smap from raster map layer. |
i.group | Creates and edits groups and subgroups of imagery files. |
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.image.mosaic | i.image.mosaic |
i.in.spotvgt | i.in.spotvgt |
i.landsat.rgb | i.landsat.rgb |
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.oif | i.oif |
i.ortho.photo | i.ortho.photo |
i.pca | Principal components analysis (pca) program 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 | Red-green-blue (rgb) to hue-intensity-saturation (his) raster map color transformation function. |
i.smap | Performs contextual image classification using sequential maximum a posteriori (SMAP) estimation. |
i.spectral | i.spectral |
i.target | Targets an imagery group to a GRASS location and mapset. |
i.tasscap | i.tasscap |
i.zc | Zero-crossing "edge detection" raster function for image processing. |