Author: GRASS Development Team

## GRASS GIS 6.2.3 Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS, is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.

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).

### Quick Introduction

- GRASS startup manual page
- How to start with GRASS
- Introductions
  - 2D raster map processing
  - 3D raster map (voxel) processing
  - Image processing
  - Database management
  - Vector map processing and network analysis
  - Projections and spatial transformations
  - SQL support
  - Display drivers
  - GRASS variables and environment variables
- The GRASS Extensions Manager (GEM)

display commands:

d.ask | Prompts the user to select a GRASS data base file from among files displayed in a menu on the graphics monitor.
d.barscale | Displays a barscale on GRASS monitor.
d.colorlist | Output a list of all available display colors with a configurable separator (default is comma).
d.colors | Allows the user to interactively change the color table
d.colortable | To display the color table associated with a raster map layer.
d.correlate | prints a graph of the correlation between data layers (in pairs)
d.erase | Erase the contents of the active display frame with user defined color
d.extend | Set window region so that all currently displayed raster, vector and sites maps can be shown in a monitor.
d.extract | Select and extract vectors with mouse into new vector map
d.font.freetype | Selects the font in which text will be displayed on the user's graphics monitor.
d.font | Selects the font in which text will be displayed on the user's graphics monitor.
d.frame | Manages display frames on the user's graphics monitor.
d.geodesic | Displays a geodesic line, tracing the shortest distance between two geographic points along a great circle, in a longitude/latitude data set.
d.graph | Program for generating and displaying simple graphics on the display monitor.
d.grid | Overlays a user-specified grid in the active display frame on the graphics monitor.
d.his | Displays the result obtained by combining hue, intensity, and saturation (his) values from user-specified input raster map layers.
d.histogram | Displays a histogram in the form of a pie or bar chart for a user-specified raster file.
d.info | Display information about the active display monitor
d.labels | Displays text labels (created with v.label) to the active frame on the graphics monitor.
d.legend | Displays a legend for a raster map in the active frame of the graphics monitor.
d.linegraph | Generates and displays simple line graphs in the active graphics monitor display frame.
d.m | Display manager for GRASS
d.mapgraph | Generates and displays simple graphics on map layers drawn in the active graphics monitor display frame.
d.measure | Measures the lengths and areas of features drawn by the user in the active display frame on the graphics monitor.
d.menu | Creates and displays a menu within the active frame on the graphics monitor.
d.mon | To establish and control use of a graphics display monitor.
d.monsize | Selects/starts specified monitor at specified size
d.mvmon | Moves displayed maps to another monitor
d.nviz | Create fly-through script to run in NVIZ
d.out.file | Saves active display monitor to graphics file in home directory
d.out.gpsdrive | Export display monitor to a GpsDrive compatible backdrop image
d.out.png | Saves active display monitor to PNG file in home directory
d.path | Find shortest path for selected starting and ending node
d.polar | Draws polar diagram of angle map such as aspect or flow directions
d.profile | Interactive profile plotting utility with optional output.
d.rast.arrow | Draws arrows representing cell aspect direction for a raster map containing aspect data.
d.rast.edit | d.rast.edit
d.rast | Displays and overlays raster map layers in the active display frame on the graphics monitor
d.rast.leg | Displays a raster map and its legend on a graphics window
d.rast.num | Overlays cell category values on a raster map layer displayed to the graphics monitor.
d.redraw | Redraws the current display frame in the GRASS monitor
d.resize | Resizes active display monitor
d.rgb | Displays three user-specified raster map layers as red, green, and blue overlays in the active graphics frame.
d.rhumbline | Displays the rhumbline joining two user-specified points, in the active frame on the user's graphics monitor.
d.save | Create a list of commands for recreating screen graphics.
d.slide.show | Slide show of GRASS raster/vector maps
d.split | Divides active display into two frames & displays maps/executes commands in each frame.
d.text.freetype | Draws text in the graphics monitor's active display frame using TrueType fonts.
d.text | Draws text in the active display frame on the graphics monitor using the current font.
d.title | Outputs a TITLE for a raster map layer in a form suitable for display by d.text.
d.vect.chart | Displays charts of GRASS vector data in the active frame on the graphics monitor
d.vect | Displays GRASS vector data in the active frame on the graphics monitor.
d.vect.thematic | Displays thematic vectormap
d.what.rast | Allows the user to interactively query the category contents of multiple raster map layers at user specified locations within the current geographic region.
d.what.vect | Allows the user to interactively query a vector map layer at user-selected locations within the current geographic region.
d.where | Identifies the geographic coordinates associated with point locations in the active frame on the graphics monitor.
d.zoom | Allows the user to change the current geographic region settings interactively, with a mouse.

Help Index | Full Index
© 2003-2007 GRASS Development Team