calcArea: Calculate the Areas of Polygons
In PBSmapping: Mapping Fisheries Data and Spatial Analysis Tools
Description
Usage
Arguments
Details
Value
Author(s)
See Also
Examples
Description
Calculate the areas of polygons found in a PolySet.
Usage
1
calcArea (polys, rollup = 3)
Arguments
polys
PolySet to use.
rollup
level of detail in the results; 1 = PIDs
only, by summing all the polygons with the same PID, 2 =
outer contours only, by subtracting holes from their parent, and
3 = no roll-up.
Details
If rollup equals 1, the results contain an area for each
unique PID only. When it equals 2, they contain entries
for outer contours only. Finally, setting it to 3 prevents
roll-up, and they contain areas for each unique (PID,
SID).
Outer polygons have positive areas and inner polygons negative areas.
When polygons are rolled up, the routine sums the positive and
negative areas and consequently accounts for holes.
If the PolySet's projection attribute equals
"LL", the function projects the PolySet in UTM first.
If the PolySet's zone attribute exists, it uses it for
the conversion. Otherwise, it computes the mean longitude and uses
that value to determine the zone. The longitude range of zone
i is -186 + 6i < x <= -180 + 6i degrees.
Value
PolyData with columns PID, SID (may be
missing), and area. If the projection equals "LL" or
"UTM", the units of area are square kilometres.
Author(s)
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2013-04-10
See Also
calcCentroid,
calcLength,
calcMidRange,
calcSummary,
locatePolys.
Examples
1
2
3
4
5
6
7
8
9
10
local(envir=.PBSmapEnv,expr={
#--- load the data (if using R)
if (!is.null(version$language) && (version$language == "R"))
data(nepacLL,envir=.PBSmapEnv)
#--- convert LL to UTM so calculation makes sense
attr(nepacLL, "zone") <- 9
nepacUTM <- convUL(nepacLL)
#--- calculate and print the areas
print(calcArea(nepacUTM))
})
Example output
sh: 1: cannot create /dev/null: Permission denied
-----------------------------------------------------------
PBS Mapping 2.70.5 -- Copyright (C) 2003-2020 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/local/lib/R/site-library/PBSmapping/doc/PBSmapping-UG.pdf
Packaged on 2018-06-05
Pacific Biological Station, Nanaimo
All available PBS packages can be found at
https://github.com/pbs-software
To see demos, type '.PBSfigs()'.
-----------------------------------------------------------
convUL: Converting coordinates within the northern hemisphere.
PID area
1 0 5.573726e+05
2 1 6.300381e+06
3 15 8.967819e+04
4 33 3.207198e+04
5 39 6.813302e+03
6 47 9.310090e+03
7 60 1.006880e+04
8 67 1.041737e+04
9 68 4.230791e+03
10 74 5.406475e+03
11 88 4.375389e+03
12 89 1.997024e+03
13 109 3.235804e+03
14 133 1.967937e+03
15 148 2.667601e+03
16 155 2.833465e+03
17 158 2.977172e+03
18 173 4.666767e+03
19 178 1.322215e+03
20 192 8.303504e+03
21 225 1.485232e+03
22 228 6.858324e+02
23 263 1.037473e+03
24 272 5.388982e+03
25 281 9.365769e+02
26 292 9.032412e+02
27 296 3.021929e+02
28 347 2.121584e+03
29 375 5.433573e+02
30 384 3.395853e+02
31 389 4.661454e+03
32 390 5.651404e+02
33 394 4.903152e+02
34 397 8.575281e+02
35 440 2.211727e+02
36 453 1.259021e+03
37 480 2.410199e+03
38 501 3.903431e+02
39 527 4.749897e+02
40 543 6.741911e+02
41 545 8.426110e+02
42 554 4.474327e+02
43 555 4.960560e+02
44 586 1.685368e+02
45 598 4.166715e+02
46 616 1.506424e+02
47 622 4.762893e+02
48 624 2.226559e+02
49 625 3.388461e+02
50 635 4.474264e+02
51 650 3.872434e+02
52 698 5.377822e+02
53 709 3.577049e+02
54 723 4.565756e+02
55 726 3.994991e+02
56 831 2.836407e+02
57 850 5.524838e+02
58 880 1.795207e+02
59 889 1.496277e+02
60 893 1.226877e+02
61 896 4.149567e+02
62 914 1.415734e+02
63 929 1.824923e+02
64 935 5.569482e+02
65 939 1.908028e+02
66 952 1.863538e+02
67 969 1.122716e+02
68 983 1.749225e+02
69 995 3.363498e+02
70 1035 1.485838e+02
71 1048 2.537314e+02
72 1070 8.275666e+01
73 1081 1.362039e+02
74 1084 8.968803e+01
75 1088 1.403633e+02
76 1101 1.925266e+02
77 1147 2.838530e+02
78 1162 3.840849e+02
79 1169 4.833114e+02
80 1216 1.624006e+02
81 1248 1.564446e+02
82 1260 1.923819e+02
83 1269 1.424737e+02
84 1297 1.549615e+02
85 1313 1.139319e+02
86 1330 3.174336e+02
87 1341 1.245480e+02
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PBSmapping documentation built on Jan. 15, 2021, 3:41 p.m.
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Description Usage Arguments Details Value Author(s) See Also Examples
Description
Calculate the areas of polygons found in a PolySet.
Usage
1 | calcArea (polys, rollup = 3)
|
Arguments
polys |
PolySet to use. |
rollup |
level of detail in the results; |
Details
If rollup equals 1, the results contain an area for each
unique PID only. When it equals 2, they contain entries
for outer contours only. Finally, setting it to 3 prevents
roll-up, and they contain areas for each unique (PID,
SID).
Outer polygons have positive areas and inner polygons negative areas. When polygons are rolled up, the routine sums the positive and negative areas and consequently accounts for holes.
If the PolySet's projection attribute equals
"LL", the function projects the PolySet in UTM first.
If the PolySet's zone attribute exists, it uses it for
the conversion. Otherwise, it computes the mean longitude and uses
that value to determine the zone. The longitude range of zone
i is -186 + 6i < x <= -180 + 6i degrees.
Value
PolyData with columns PID, SID (may be
missing), and area. If the projection equals "LL" or
"UTM", the units of area are square kilometres.
Author(s)
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2013-04-10
See Also
calcCentroid,
calcLength,
calcMidRange,
calcSummary,
locatePolys.
Examples
1 2 3 4 5 6 7 8 9 10 | local(envir=.PBSmapEnv,expr={
#--- load the data (if using R)
if (!is.null(version$language) && (version$language == "R"))
data(nepacLL,envir=.PBSmapEnv)
#--- convert LL to UTM so calculation makes sense
attr(nepacLL, "zone") <- 9
nepacUTM <- convUL(nepacLL)
#--- calculate and print the areas
print(calcArea(nepacUTM))
})
|
Example output
sh: 1: cannot create /dev/null: Permission denied
-----------------------------------------------------------
PBS Mapping 2.70.5 -- Copyright (C) 2003-2020 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/local/lib/R/site-library/PBSmapping/doc/PBSmapping-UG.pdf
Packaged on 2018-06-05
Pacific Biological Station, Nanaimo
All available PBS packages can be found at
https://github.com/pbs-software
To see demos, type '.PBSfigs()'.
-----------------------------------------------------------
convUL: Converting coordinates within the northern hemisphere.
PID area
1 0 5.573726e+05
2 1 6.300381e+06
3 15 8.967819e+04
4 33 3.207198e+04
5 39 6.813302e+03
6 47 9.310090e+03
7 60 1.006880e+04
8 67 1.041737e+04
9 68 4.230791e+03
10 74 5.406475e+03
11 88 4.375389e+03
12 89 1.997024e+03
13 109 3.235804e+03
14 133 1.967937e+03
15 148 2.667601e+03
16 155 2.833465e+03
17 158 2.977172e+03
18 173 4.666767e+03
19 178 1.322215e+03
20 192 8.303504e+03
21 225 1.485232e+03
22 228 6.858324e+02
23 263 1.037473e+03
24 272 5.388982e+03
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