Description Usage Arguments Details Value Author(s) See Also Examples
Calculate the length of polylines found in a PolySet.
1 |
polys |
PolySet to use. |
rollup |
level of detail in the results; |
close |
Boolean value; if |
If rollup
equals 1
, the results contain an entry for
each unique PID
only. Setting it to 3
prevents roll-up,
and they contain an entry for each unique (PID
, SID
).
If the projection
attribute equals "LL"
, this routine uses
Great Circle distances to compute the surface length of each polyline.
In doing so, the algorithm simplifies Earth to a sphere.
If the projection
attribute equals "UTM"
or 1
, this
routine uses Pythagoras' Theorem to calculate lengths.
PolyData with columns PID
, SID
(may be missing),
and length
. If projection
equals "UTM"
or
"LL"
, lengths are in kilometres. Otherwise, lengths are in the
same unit as the input PolySet.
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2013-04-10
calcArea
,
calcCentroid
,
calcMidRange
,
calcSummary
,
locatePolys
.
1 2 3 4 5 6 7 |
sh: 1: cannot create /dev/null: Permission denied
-----------------------------------------------------------
PBS Mapping 2.70.4 -- Copyright (C) 2003-2018 Fisheries and Oceans Canada
PBS Mapping comes with ABSOLUTELY NO WARRANTY;
for details see the file COPYING.
This is free software, and you are welcome to redistribute
it under certain conditions, as outlined in the above file.
A complete user guide 'PBSmapping-UG.pdf' is located at
/usr/lib/R/site-library/PBSmapping/doc/PBSmapping-UG.pdf
Packaged on 2017-06-28
Pacific Biological Station, Nanaimo
All available PBS packages can be found at
https://github.com/pbs-software
To see demos, type '.PBSfigs()'.
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PID length
1 33 2866.661
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