imagery(1grass)

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version 8.5.0 · 9 versions
, in alpine 3.24, ubuntu stonking

💖 imagery(1grass) — aka the GRASS User's Manual page, but make it ✨aesthetic✨ 💖

okay bestie, so this is the imagery(1grass) page out of the GRASS 8.5.0 Reference Manual — the GRASS User's Manual, the whole vibe, the main character of geo-docs. Sit down, grab a boba, we're gonna get through this together. 🧚

🌸 GRASS 8.5.0 Reference Manual 🌸

So. Geographic Resources Analysis Support System, which everybody and their groupchat calls GRASS, is a Geographic Information System (GIS). She's the girl who does it ALL: geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. She's out here in academic and commercial settings all around the world, plus serving many governmental agencies and environmental consulting companies. Lowkey an icon, highkey employed. 👑

This reference manual details the use of modules distributed with Geographic Resources Analysis Support System (GRASS), an open source (GNU GPLed), image processing and geographic information system (GIS). Periodt. That's the whole résumé and it ATE.

Go to Imagery introduction | topics

Go back to help overview

💅 ✨ Imagery commands: ✨ 💅

This is the roster. The whole friend group. Every single one of these i.* girlies is in the groupchat, no cap:

  • 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.

The navigation breadcrumbs, so you never get lost in the mall: Main index | Topics index | Keywords index | Graphical index | Full index. 🫶

And that's the page!! Every single i.* module accounted for, nothing skipped, we did NOT leave anyone on read. 💜

okay bye babes, mwah — this was the GRASS 8.5.0 Reference Manual, imagery(1grass), © 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual. Go slay some imagery 💅🌺✨

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