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.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 | 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 | Mosaics up to 4 images and extends colormap; creates map *.mosaic |
i.in.spotvgt | Import of SPOT VGT NDVI file into a raster map |
i.landsat.rgb | Auto-balancing of colors for LANDSAT images |
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 | Calculates Optimum-Index-Factor table for LANDSAT TM bands 1-5, & 7 |
i.ortho.photo | i.ortho.photo |
i.pca | Principal components analysis (pca) program for image processing. |
i.points | Mark ground control points on image to be rectified. |
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 | 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 | Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data |
i.vpoints | Set registration points for an imagery group from a vector map or keyboard entry. |
i.zc | Zero-crossing "edge detection" raster function for image processing. |