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How to start with GRASS

vector commands: v.buffer Create a buffer around features of given type (areas must contain centroid). v.build.all v.build.all v.build Creates topology for GRASS vector data. v.build.polylines Build polylines from lines. v.category Attach, delete or report vector categories to map geometry. v.clean Toolset to clean vector topology. v.convert.all v.convert Imports older versions of GRASS vectors. v.db.connect prints/sets DB connection for a vector map v.db.select Print vector attributes v.delaunay Create a Delaunay triangulation from an input vector of points or centroids. v.digit v.distance Find the nearest element in vector 'to' for elements in vector 'from'. Various information about this relation may be uploaded to the attribute table of input vector 'from' or printed to stdout. v.external Create a new vector as a read-only link to OGR layer. Available drivers: v.extract Selects vector objects from an existing vector map and creates a new map containing only the selected objects. If 'list', 'file' and 'where' options are not specified, all features of given type and layer are extracted, categories are not changed in that case. v.hull Uses a GRASS vector points map to produce a convex hull vector map v.in.ascii Convert GRASS ascii file or points file to binary vector. v.in.db Create new vector (points) from database table containing coordinates. v.in.e00 Import of E00 file into a vector map. v.in.garmin Upload Waypoints, Routes, and Tracks from a Garmin GPS receiver into a vector map. v.in.ogr Convert OGR vectors to GRASS. Available drivers: v.in.region Create a new vector from current region. v.in.sites.all v.in.sites Converts a GRASS site_lists file into a vector file. v.info Outputs basic information about a user-specified vector map layer. v.kcv Randomly partition points into test/train sets. v.kernel Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally generates a vector density map on vector network with a 1D kernel v.label Create paint labels for GRASS vector file and attached attributes. v.mkgrid Creates a (binary) GRASS vector map of a user-defined grid. v.neighbors Makes each cell value a function of the attribute values assigned to the vector points or centroids around it, and stores new cell values in an output raster map layer. v.net.alloc Allocate subnets for nearest centres (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculation v.net Network maintenance. v.net.iso Split net to bands between cost isolines (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculation v.net.path Find shortest path on vector network. Reads start/end pointsfrom standard input in 2 possible formats: v.net.salesman Create a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is used by this module and created cycle may be sub optimal. v.net.steiner Create Steiner tree for the network and given terminals. Note that 'Minimum Steiner Tree' problem is NP-hard and heuristic algorithm is used in this module so the the result may be sub optimal. v.normal tests for normality for points. v.out.ascii Convert a GRASS binary vector map to a GRASS ASCII vector map v.out.dxf Exports GRASS vector files to DXF file format. v.out.ogr Convert to OGR format. v.out.pov Convert to POV-Ray format, GRASS x,y,z -> POV-Ray x,z,y v.overlay Overlay 2 vector maps. v.patch Creates a new binary vector map layer by combining other binary vector map layers. v.perturb Random location perturbations of GRASS sites. v.proj Allows projection conversion of vector files. v.qcount indices for quadrat counts of sites lists v.random Randomly generate a GRASS vector points map. v.reclass Changes vector category values for an existing vector map according to results of SQL queries or a value in attribute table column. v.sample Sample a raster file at site locations. v.segment Create points/segments from input lines, and positions read from stdin in format: v.select Select features from ainput by features from binput. v.surf.idw Surface interpolation from sites data by Inverse Distance Squared Weighting. v.surf.rst Interpolation and topographic analysis from given point or contour data in vector format to GRASS floating point raster format using regularized spline with tension. v.to.db Load values from vector to database. In uploaded/printed category values '-1' is used for 'no category' and 'null'/'-' if category cannot be found or multiple categories were found. v.to.points Create points along input lines. v.to.rast Converts a binary GRASS vector map layer into a GRASS raster map layer. v.transform Transforms an vector map layer from one coordinate system into another coordinate system. v.type Change the type of geometry elements. v.univar Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points. v.vol.rst Interpolates point data to a G3D grid volume using regularized spline with tension (RST) algorithm v.voronoi Create a Voronoi triangulation from an input vector of points or centroids. v.what.rast Upload raster values at positions of vector points to the table.

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