NAME
d.measure - Measures the lengths and areas of features
drawn by the user in the active display frame on the graphics monitor.
(GRASS Display Program)
SYNOPSIS
d.measure
d.measure help
d.measure
[c1=name]
[c2=name]
DESCRIPTION
d.measure provides the user with an interactive
way to measure the lengths and areas of lines and polygons
drawn by the user in the active frame on the graphics
monitor. Lines and polygons are drawn using a pointing
device (mouse). Each line segment is drawn in colors
c1 and c2. A mouse button menu indicates
that the user can find out the geographic coordinates of
the cursor location, draw line segments between
user-specified vertices, and quit d.measure. Lines
and polygons are defined by the series of vertices marked
by the user. If more than two successive vertices are
drawn, d.measure prints the area encompassed
(d.measure will assume the area is closed even if
the user has not joined the first and last vertices). Line
lengths are stated in the same units as those of the
current LOCATION. Areas are stated in hectares, square
miles, and square meters.
Lines and polygons drawn using d.measure will
overlay (not overwrite) whatever display currently appears
in the active frame on the graphics monitor. The user can,
for example, run
d.rast or
d.vect prior to running
d.measure, and use raster and/or vector maps
as a backdrop.
OPTIONS
The user can specify the colors in which line segments will
be drawn by setting the values of c1 and
c2 on the command line. Default line colors (see
below) will be used if the user does not specify the values
of c1 and c2 on the command line.
Parameters:
- c1=name
- The first color in which each line segment is drawn,
while being positioned.
Options: red, orange, yellow, green, blue, indigo, violet, magenta, brown,
gray, white, and black
Default: white
- c2=name
- The second color in which each line segment is drawn,
after its vertices are fixed.
Options: Same as c1.
Default: white
NOTES
d.measure uses all segments drawn by the user when computing area.
If the user draws an area within another area, the combined
area of both regions will be output.
SEE ALSO
d.display
d.frame
d.graph
d.mapgraph
d.rast
d.vect
d.where
AUTHORS
James Westervelt,
Michael Shapiro,
U.S. Army Construction Engineering
Research Laboratory