r.in.poly

NAME

r.in.poly - Create raster maps from ascii polygon/line data files in the current directory.

SYNOPSIS

r.in.poly
r.in.poly help
r.in.poly input=string output=string [title="phrase"] [rows=integer]

Parameters:

input=string: Input file
output=string: Raster output file
title="phrase": Title for resultant raster map
rows=integer: Number of rows to hold in memory; Default: 4096

DESCRIPTION

r.in.poly allows the creation of GRASS binary raster maps from ASCII files in the current directory containing polygon and linear features. The input file is a Unix input file, in ascii format, containing the polygon and linear features. The format of this file is described in the section INPUT FORMAT below.

Number of rows to hold in memory is per default 512. This parameter allows users with less memory (or more) on their system to control how much memory r.in.poly uses.

INPUT FORMAT

The input format for the input file consists of sections describing either polygonal areas or linear features. The basic format is:

A                      <for polygonal areas>
    easting northing
    .
    .
    .
=   cat# label
L                      <for linear features>
    easting northing
    .
    .
    .
=   cat# label

The A signals the beginning of a polygon. It must appear in the first column. The L signal the beginning of a linear feature. It also must appear in the first column. The coordinates of the vertices of the polygon, or the coordinates defining the linear feature follow and must have a space in the first column and at least one space between the easting and the northing. To give meaning to the features, the = indicates that the feature currently being processed has category value cat# (which must be an integer) and a label (which may be more than one word, or which may be omitted).

EXAMPLE

An area described by four points:

  A
  591316.80   4926455.50
  591410.25   4926482.40
  591434.60   4926393.60
  591341.20   4926368.70
  = 42 stadium

AUTHOR

Michael Shapiro, U.S.Army Construction Engineering Research Laboratory

Last changed: $Date: 2003/08/23 06:52:42 $

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