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Re: [ferret_users] pt_in_poly



Ansley Manke a écrit :
Hi Patrick
We certainly can include it. Do you have a nice example or two that I could show in the documentation? Often a relevant example from a real application is more useful than some simplified example I might come up with.


Here is an example made today for a colleague.
He wanted to calculate variables on a circumpolar area defined
by a frontier given by specific properties of waters.

Patrick

--
LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ
Data Analysis and Visualization Engineer
ICMC - IPSL Climate Modelling Centre
--

!---------------------------------------------------
! Read a lon, lat text file with position of polygon
! Southern Ocean - SAF
let nblines={spawn: "wc -l SAF.txt | cut -f 1 -d' '"}
def axis/x=1:`nblines`:1 vector_length

def grid/x=vector_length vector_grid
file/var=XP0,YP0/g=vector_grid SAF.txt

!---------------------------------------------------
! Duplicate first point and add extra points to consider 
! the modulo aspect of longitudes and go down to -90N in latitudes
let XP1 = XCAT(XP0[I=1],XP0)
let XP2 = XCAT(XP1,`XP0[I=1]+360`)
let XP3 = XCAT(XP2,`XP0[I=1]+360`)

let YP1 = XCAT(-90,YP0)
let YP2 = XCAT(YP1,YP0[I=1])
let YP3 = XCAT(YP2,-90)

!---------------------------------------------------
use etopo60

! Define rose according to range of XP0 (-180:180)
def axis/x=-180:180:1/units="degrees_east"/modulo/edges myxaxis
let nrose=rose[gx=myxaxis]

!---------------------------------------------------
! Plot a basemap
shade/pal=grayscale/nokey/nolab nrose[d=2] ; go land 1 

! Draw the limit line 
plot/vs/line/nolab/d=1/o XP0, YP0
! Draw the closed polygon to be used
polygon/pat=lite_up_right_to_left/pal=black/nolab/d=1/over XP3, YP3

!---------------------------------------------------
! Define a gridded mask 1x1 degrees from the polygon
let circum = if pt_in_poly(nrose[d=2],XP3[d=1],YP3[d=1]) gt 0 then 1

! Overlay the gridded mask 
shade/over/pal=red/nokey/nolab circum

!---------------------------------------------------
! Save the mask
save/clobber/file=circum.nc circum

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-9.14       -46.4
-8.74       -46.3
-8.2        -46.22
-7.41       -46.19
-6.83       -46.17
-6.24       -46.14
-5.72       -46.11
-5.27       -46.08
-4.39       -46.05
-3.95       -46.04
-3.9        -46.03
-3.89       -46.02
-3.65       -46.03
-3.25       -46.06
-2.76       -46.01
-2.16       -45.9
-1.47       -45.82
-1.03       -45.78
-0.41       -45.73
0.06        -45.71
0.72        -45.68
1.39        -45.66
1.51        -45.67
1.53        -45.67
1.61        -45.71
1.88        -45.87
2.28        -46.11
2.62        -46.32
2.91        -46.55
3.28        -46.84
3.57        -47.06
3.79        -47.24
4.15        -47.49
4.54        -47.75
5.04        -48
5.52        -48.16
6.17        -48.24
6.85        -48.29
7.5         -48.3
8.35        -48.29
8.86        -48.27
9.62        -48.26
10.57       -48.25
11.2        -48.25
11.83       -48.25
12.43       -48.27
13.19       -48.31
13.92       -48.35
14.65       -48.34
15.35       -48.27
16.02       -48.16
16.5        -48.1
17.01       -48
17.5        -47.9
17.97       -47.8
18.4        -47.72
18.86       -47.66
19.2        -47.6
19.53       -47.54
19.84       -47.5
20.24       -47.48
20.38       -47.44
20.81       -47.27
21.03       -47.17
21.27       -47.07
21.51       -46.98
21.78       -46.91
21.99       -46.86
22.47       -46.8
22.79       -46.78
23.48       -46.7
24.09       -46.65
24.66       -46.61
25.21       -46.62
25.75       -46.68
26.14       -46.76
26.6        -46.91
27.19       -47.09
27.76       -47.29
28.28       -47.48
28.62       -47.6
28.95       -47.72
29.26       -47.84
29.5        -47.92
29.67       -47.99
29.71       -48.03
29.75       -48.04
29.8        -48.05
29.99       -48.06
30          -48.02
30          -48.02
30.02       -47.99
30.05       -48.01
30.16       -48.03
30.32       -48.04
30.52       -48.04
30.58       -48.05
30.65       -48.05
31          -48.1
31.09       -48.11
31.25       -48.11
31.64       -48.12
32.14       -48.08
32.3        -48.08
32.51       -48.11
32.67       -48.12
32.89       -48.11
33.25       -48.12
33.51       -48.13
33.73       -48.15
34.04       -48.2
34.25       -48.24
34.48       -48.31
34.77       -48.37
35.02       -48.44
35.33       -48.5
35.64       -48.55
35.92       -48.56
36.29       -48.57
36.88       -48.58
37.27       -48.6
37.8        -48.62
38.33       -48.62
38.86       -48.6
39.46       -48.59
40.04       -48.58
40.46       -48.58
41.04       -48.56
41.63       -48.52
42.18       -48.47
42.76       -48.41
43.38       -48.34
43.94       -48.26
44.46       -48.17
45.02       -48.05
45.5        -47.93
45.99       -47.81
46.31       -47.74
46.54       -47.67
46.83       -47.57
47.06       -47.48
47.38       -47.35
47.64       -47.15
47.79       -46.99
47.93       -46.76
48.1        -46.53
48.31       -46.25
48.58       -45.98
48.95       -45.7
49.37       -45.5
49.82       -45.35
50.25       -45.24
50.69       -45.19
51.28       -45.2
51.89       -45.26
52.55       -45.36
53.27       -45.55
53.96       -45.8
54.53       -46.04
55.12       -46.26
55.7        -46.44
56.25       -46.55
56.91       -46.64
57.62       -46.69
58.22       -46.71
58.86       -46.71
59.53       -46.64
60.22       -46.5
60.87       -46.29
61.46       -46.07
62.07       -45.8
62.7        -45.58
63.38       -45.4
64.16       -45.29
64.94       -45.2
65.75       -45.1
66.3        -45.01
66.81       -44.99
67.43       -44.99
67.59       -44.99
67.77       -44.99
67.99       -45.03
68.46       -44.95
68.58       -44.95
68.74       -44.99
69.21       -45.09
70          -45.23
70.87       -45.35
71.63       -45.49
72.25       -45.73
72.98       -46.07
73.72       -46.31
74.64       -46.49
75.66       -46.66
76.83       -46.83
77.81       -46.97
78.7        -47.11
79.61       -47.27
80.58       -47.4
81.53       -47.49
82.26       -47.52
82.88       -47.55
83.67       -47.58
84.66       -47.63
85.51       -47.69
85.94       -47.74
86.53       -47.81
87.27       -47.96
88.02       -48.12
88.69       -48.24
89.31       -48.33
90.03       -48.44
90.56       -48.53
90.92       -48.56
91.25       -48.54
91.67       -48.43
92.08       -48.29
92.46       -48.14
92.94       -47.9
93.4        -47.63
93.86       -47.37
94.21       -47.22
94.63       -47.1
95.01       -47
95.34       -46.95
95.87       -46.92
96.61       -46.99
97.55       -47.15
98.42       -47.29
99.1        -47.42
99.93       -47.59
100.6       -47.69
101.01      -47.7
101.78      -47.74
102.64      -47.83
103.44      -47.91
103.94      -47.93
104.7       -47.97
105.34      -48.02
105.94      -48.08
106.61      -48.16
107.46      -48.31
108.26      -48.44
109.11      -48.56
109.63      -48.65
110.11      -48.72
110.83      -48.81
111.28      -48.88
111.81      -48.97
112.36      -49.07
112.92      -49.15
113.26      -49.2
113.52      -49.23
113.93      -49.27
114.25      -49.3
114.51      -49.31
114.75      -49.33
115.02      -49.38
115.3       -49.43
115.53      -49.46
115.72      -49.51
115.99      -49.58
116.24      -49.67
116.58      -49.83
116.97      -50.04
117.03      -50.04
117.48      -50.19
118.04      -50.39
118.63      -50.59
118.95      -50.71
119.49      -50.88
119.68      -50.93
119.85      -50.99
120         -51.01
120         -51.01
120.06      -51.05
120.21      -51.11
120.49      -51.17
120.96      -51.21
121.25      -51.22
121.83      -51.29
122.45      -51.38
122.97      -51.43
123.16      -51.44
123.4       -51.45
123.69      -51.45
124.09      -51.45
124.47      -51.45
124.75      -51.47
125.17      -51.46
125.51      -51.42
125.88      -51.31
126.18      -51.18
126.51      -51.03
126.86      -50.86
127.23      -50.73
127.63      -50.61
128.15      -50.59
128.65      -50.66
129.07      -50.75
129.57      -50.88
130.03      -51.01
130.49      -51.15
131.02      -51.33
131.39      -51.46
131.7       -51.52
132.23      -51.58
132.75      -51.6
133.16      -51.59
133.76      -51.6
134.48      -51.62
135.04      -51.63
135.53      -51.62
136.11      -51.59
136.72      -51.59
137.53      -51.65
138.34      -51.71
139         -51.74
139.77      -51.76
140.72      -51.8
141.74      -51.85
142.62      -51.85
143.23      -51.84
143.95      -51.84
144.65      -51.86
145.49      -51.91
146.14      -52.07
146.77      -52.27
147.27      -52.48
147.54      -52.59
147.82      -52.69
148.16      -52.81
148.59      -52.99
148.9       -53.16
149.26      -53.32
149.76      -53.47
150.23      -53.6
150.54      -53.79
150.84      -54.05
151.01      -54.19
151.19      -54.26
151.55      -54.32
152.04      -54.37
152.57      -54.33
153.15      -54.23
153.59      -54.13
154.09      -54.03
154.63      -53.92
155.08      -53.82
155.58      -53.71
156.04      -53.62
156.58      -53.52
157.09      -53.45
157.52      -53.42
157.96      -53.42
158.55      -53.49
159.21      -53.63
159.73      -53.76
160.19      -53.92
160.63      -54.11
160.86      -54.3
161.14      -54.47
161.45      -54.64
161.8       -54.83
162.16      -55.04
162.55      -55.26
163.03      -55.51
163.4       -55.72
163.8       -55.91
164.24      -56.11
164.71      -56.29
165.13      -56.46
165.42      -56.62
165.69      -56.79
165.76      -56.84
165.79      -56.87
165.89      -56.9
166.03      -56.95
166.28      -57.07
166.71      -57.3
167.07      -57.51
167.52      -57.74
168.12      -58.02
168.67      -58.17
169.25      -58.23
169.89      -58.28
170.42      -58.31
171.05      -58.27
171.85      -58.16
172.47      -58.03
173.16      -57.87
173.88      -57.75
174.51      -57.61
175.2       -57.47
175.94      -57.32
176.56      -57.2
177.18      -57.09
177.92      -57.01
178.71      -56.96
179.39      -56.9

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