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Die Besprechung ueber das Vorgehen ihrer Aufgaben ergab:
- die Transformation in polarstereographische Koordinaten und der nachfolgende Uebergang zu den Bildpunkten von ASAR
Eckpunkte und Aufloseung des ASAR-Bildes variieren frei -> allgemeingueltiges Programm fuer den Uebergang der Output erfolgt als Vektor in der Form x, y, Freiboardhoehe; eventuell die Floatangabe
fbh_bildkoordinaten.py
1 from polar_projection import *
2 from read_asar import *
3 import string
4
5 def fit_freeboard_ASAR(filename1,filename2,resolution):
6 """filename1: ASAR data file, filename2: freeboard data file, resolution: ASAR image data resolution
7 creates new coordinate system defined by corners of ASAR image and selects freeboard values within
8 ASAR image box and returns an array containing normalized image coordinates and corresponding
9 freeboard values:
10 [x_coordinate, y_coordinate, freeboardheight(cm)]"""
11
12 sgn=-1 #Antarctica
13 lat1,lon1,lat2,lon2,lat3,lon3,lat4,lon4=read_asar_corners(filename1)
14
15 ASAR_1=[lat1,lon1]
16 ASAR_2=[lat2,lon2]
17 ASAR_3=[lat3,lon3]
18 ASAR_4=[lat4,lon4]
19
20 ASAR_1p=mapll(ASAR_1[0],ASAR_1[1],sgn) #computing polarstereographic coordinates
21 ASAR_2p=mapll(ASAR_2[0],ASAR_2[1],sgn)
22 ASAR_3p=mapll(ASAR_3[0],ASAR_3[1],sgn)
23 ASAR_4p=mapll(ASAR_4[0],ASAR_4[1],sgn)
24
25 X=int(abs(ASAR_2p[0]-ASAR_1p[0])/resolution) #image size in pixel
26 Y=int(abs(ASAR_4p[1]-ASAR_1p[1])/resolution)
27
28 # polarstereographic coordinate system
29 y00,x00,y01,x01,y02,x02,y03,x03=int(ASAR_1p[1]),int(ASAR_1p[0]),int(ASAR_4p[1]),int(ASAR_4p[0]),int(ASAR_3p[1]),int(ASAR_3p[0]),int(ASAR_2p[1]),int(ASAR_2p[0])
30 # new coordinate system with normalized coordinates
31 y10,x10,y11,x11,y12,x12,y13,x13=0,0,1,0,1,1,0,1
32
33 # calculating transformation matrix:
34 P0=array([[x00, x01, x02, x03],[y00,y01,y02,y03],[1.0,1.0,1.0,1.0]])
35 P1=array([[x10, x11, x12, x13],[y10,y11,y12,y13],[1.0,1.0,1.0,1.0]])
36
37 Faktor1=dot(P1,transpose(P0))
38 Faktor2=inverse(dot(P0,transpose(P0)))
39 A=dot(Faktor1,Faktor2) # Transformation matrix
40
41 # reading freeboard data
42 lon=[]
43 lat=[]
44 fbh=[]
45 datei = open (filename2, 'r')
46 line=datei.readline()
47 k=-1
48 while line!="":
49 k=k+1
50 data=string.split(line)
51 lon.append(float(data[0]))
52 lat.append(abs(float(data[1])))
53 fbh.append(float(data[2]))
54 line=datei.readline()
55
56 polar=mapll(array(lat),array(lon),sgn)
57
58 # calculating new coordinates for freeboard data
59 x_neu=[]
60 y_neu=[]
61 for x,y in zip(polar[0],polar[1]):
62 x_neu.append(dot(array([A[0,0],A[0,1]]),array([x,y]))+A[0,2])
63 y_neu.append(dot(array([A[1,0],A[1,1]]),array([x,y]))+A[1,2])
64
65 # cutting off non-corresponding data values
66 m=-1
67 index_vec=[]
68 for xn,yn in zip(x_neu,y_neu):
69 m=m+1
70 if xn<=1. and xn >=0. and yn<=1. and yn >=0.:
71 index_vec.append(m)
72
73 x_bild=[]
74 y_bild=[]
75 fbh_bild=[]
76 for i in index_vec:
77 x_bild.append(x_neu[i])
78 y_bild.append(y_neu[i])
79 fbh_bild.append(fbh[i])
80
81 x_y_fbh=array([x_bild,y_bild,fbh_bild])
82
83 return x_y_fbh
Die benötigten Module polar_projection.py und read_asar.py sind auf der Seite der Arbeitsgruppe 0 AG0_ASAR_Einlesen zu finden.
fbh_bildkoordinaten_test.py
1 from polar_projection import *
2 from read_asar import *
3 import string
4
5 def fit_freeboard_ASAR(filename1,filename2,resolution):
6 """filename1: ASAR data file, filename2: freeboard data file, resolution: ASAR image data resolution
7 creates new coordinate system defined by corners of ASAR image and selects freeboard values within
8 ASAR image box returns an array containing normalized image coordinates and corresponding
9 freeboard values:
10 [x_coordinate, y_coordinate, freeboardheight(cm)]"""
11
12 sgn=-1 #Antarctica
13 lat1,lon1,lat2,lon2,lat3,lon3,lat4,lon4=read_asar_corners(filename1)
14
15 ASAR_1=[lat1,lon1]
16 ASAR_2=[lat2,lon2]
17 ASAR_3=[lat3,lon3]
18 ASAR_4=[lat4,lon4]
19
20 ASAR_1p=mapll(ASAR_1[0],ASAR_1[1],sgn) #computing polarstereographic coordinates
21 ASAR_2p=mapll(ASAR_2[0],ASAR_2[1],sgn)
22 ASAR_3p=mapll(ASAR_3[0],ASAR_3[1],sgn)
23 ASAR_4p=mapll(ASAR_4[0],ASAR_4[1],sgn)
24
25 X=int(abs(ASAR_2p[0]-ASAR_1p[0])/resolution) #image size in pixel
26 Y=int(abs(ASAR_4p[1]-ASAR_1p[1])/resolution)
27
28 # polarstereographic coordinate system
29 y00,x00,y01,x01,y02,x02,y03,x03=int(ASAR_1p[1]),int(ASAR_1p[0]),int(ASAR_4p[1]),int(ASAR_4p[0]),int(ASAR_3p[1]),int(ASAR_3p[0]),int(ASAR_2p[1]),int(ASAR_2p[0])
30 # new coordinate system with normalized coordinates
31 y10,x10,y11,x11,y12,x12,y13,x13=0,0,1,0,1,1,0,1
32
33 # calculating transformation matrix:
34 P0=array([[x00, x01, x02, x03],[y00,y01,y02,y03],[1.0,1.0,1.0,1.0]])
35 P1=array([[x10, x11, x12, x13],[y10,y11,y12,y13],[1.0,1.0,1.0,1.0]])
36
37 Faktor1=dot(P1,transpose(P0))
38 Faktor2=inverse(dot(P0,transpose(P0)))
39 A=dot(Faktor1,Faktor2) # Transformation matrix
40
41 # reading freeboard data
42 lon=[]
43 lat=[]
44 fbh=[]
45 datei = open (filename2, 'r')
46 line=datei.readline()
47 k=-1
48 while line!="":
49 k=k+1
50 data=string.split(line)
51 lon.append(float(data[0]))
52 lat.append(abs(float(data[1])))
53 fbh.append(float(data[2]))
54 line=datei.readline()
55
56 polar=mapll(array(lat),array(lon),sgn)
57
58 # calculating new coordinates for freeboard data
59 x_neu=[]
60 y_neu=[]
61 for x,y in zip(polar[0],polar[1]):
62 x_neu.append(dot(array([A[0,0],A[0,1]]),array([x,y]))+A[0,2])
63 y_neu.append(dot(array([A[1,0],A[1,1]]),array([x,y]))+A[1,2])
64
65 # cutting off non-corresponding data values
66 m=-1
67 index_vec=[]
68 for xn,yn in zip(x_neu,y_neu):
69 m=m+1
70 if xn<=1. and xn >=0. and yn<=1. and yn >=0.:
71 index_vec.append(m)
72
73 x_bild=[]
74 y_bild=[]
75 fbh_bild=[]
76 for i in index_vec:
77 x_bild.append(x_neu[i])
78 y_bild.append(y_neu[i])
79 fbh_bild.append(fbh[i])
80
81 x_y_fbh=array([x_bild,y_bild,fbh_bild])
82
83 return x_y_fbh
84
85 filename1='ASA_IMP_1PNDPA20060617_043346_000000162048_00362_22460_2136.N1'
86 filename2='LonLatFre_1706_6.xyz'
87 resolution=0.025
88 ergebnis=fit_freeboard_ASAR(filename1,filename2,resolution)