Diff for "\AG1_Freibord"

Differences between revisions 2 and 13 (spanning 11 versions)

Die Besprechung ueber das Vorgehen ihrer Aufgaben ergab:

die Transformation in polarstereographische Koordinaten und der nachfolgende Uebergang zu den Bildpunkten von ASAR
Eckpunkten und Aufloseung des ASAR-Bildes variieren frei -> allgemeingueltiges Programm fuer den Uebergang des Outputs erfolgt als Vektor in der Form x, y, Freiboardhoehe(fbh)

fbh_bildkoordinaten.py

   1 from polar_projection import *
   2 from read_asar import *
   3 from read_icesat import *
   4 from LinearAlgebra import *
   5 from Numeric import *
   6 
   7 def fit_freeboard_ASAR(filename1,filename2):
   8     """filename1: ASAR data file, filename2: freeboard data file
   9        creates new coordinate system defined by corners of ASAR image and selects freeboard values within ASAR image box
  10        returns an array containing normalized image coordinates and corresponding freeboard values:
  11        [x_coordinate, y_coordinate, freeboardheight(cm)]"""
  12     
  13     sgn=-1  #Antarctica
  14     ASAR=array(read_asar_corners(filename1))
  15     ASAR_p=zeros(8)
  16     for k in arange(0,7,2):       #computing polarstereographic coordinates
  17         ASAR_p[k:k+2]=mapll(ASAR[k],ASAR[k+1],sgn)
  18    
  19     # polarstereographic coordinate system
  20     y00,x00,y01,x01,y02,x02,y03,x03=int(ASAR_p[1]),int(ASAR_p[0]),int(ASAR_p[7]),int(ASAR_p[6]),int(ASAR_p[5]),int(ASAR_p[4]),int(ASAR_p[3]),int(ASAR_p[2])
  21     # new coordinate system with normalized coordinates  
  22     y10,x10,y11,x11,y12,x12,y13,x13=0,0,1,0,1,1,0,1
  23 
  24     # calculating transformation matrix:
  25     P0=array([[x00, x01, x02, x03],[y00,y01,y02,y03],[1.0,1.0,1.0,1.0]])
  26     P1=array([[x10, x11, x12, x13],[y10,y11,y12,y13],[1.0,1.0,1.0,1.0]])
  27 
  28     Faktor1=dot(P1,transpose(P0))
  29     Faktor2=inverse(dot(P0,transpose(P0)))
  30     A=dot(Faktor1,Faktor2)  # Transformation matrix 
  31 
  32     # reading freeboard data and computing geographic into polarstereographic coordinates
  33     ICESAT_p,fbh=read_icesat(filename2,sgn)
  34 
  35     # calculating new coordinates for freeboard data
  36     x_neu=[]
  37     y_neu=[]
  38     for x,y in zip(ICESAT_p[0],ICESAT_p[1]):
  39         x_neu.append(dot(array([A[0,0],A[0,1]]),array([x,y]))+A[0,2])
  40         y_neu.append(dot(array([A[1,0],A[1,1]]),array([x,y]))+A[1,2])
  41 
  42     # cutting off non-corresponding data values  
  43     m=-1
  44     index_vec=[]
  45     for xn,yn in zip(x_neu,y_neu):
  46         m=m+1
  47         if xn<=1. and xn >=0. and yn<=1. and yn >=0.:
  48             index_vec.append(m)
  49 
  50     x_bild=[]
  51     y_bild=[] 
  52     fbh_bild=[]
  53     for i in index_vec:
  54         x_bild.append(x_neu[i])
  55         y_bild.append(y_neu[i])
  56         fbh_bild.append(fbh[i])
  57 
  58     x_y_fbh=array([x_bild,y_bild,fbh_bild])
  59 
  60     return x_y_fbh

   1 import string
   2 from polar_projection import *
   3 from scipy import io
   4 
   5 def read_icesat(filename,sgn):
   6     data=io.read_array(filename)
   7     polar=mapll(data[:,1],data[:,0],sgn)
   8     fbh=data[:,2]
   9     return polar,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

Zum Testen hängt man an das obige Programm folgende Zeilen an:

   1 filename1='ASA_IMP_1PNDPA20060617_043346_000000162048_00362_22460_2136.N1'
   2 filename2='LonLatFre_1706_6.xyz'
   3 ergebnis=fit_freeboard_ASAR(filename1,filename2)

-  ⇤ ← Revision 2 as of 2008-07-09 09:17:16 → 
  Size: 3008
  Editor: NinaMaass
  Comment:
+   ← Revision 13 as of 2008-07-10 13:49:07 → ⇥
  Size: 3423
  Editor: DennisBruening
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 4:
-  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
+  Eckpunkten und Aufloseung des ASAR-Bildes variieren frei -> allgemeingueltiges Programm fuer den Uebergang
  des Outputs erfolgt als Vektor in der Form x, y, Freiboardhoehe(fbh)
 Line 9:
-fbh_bildkoordinaten.py
+'''fbh_bildkoordinaten.py'''
 Line 12:
-from geo_polar import *
+from polar_projection import *
 Line 14:
-import string
+from read_icesat import *
from LinearAlgebra import *
from Numeric import *
-Line 16:
+Line 18:
-def fit_freeboard_ASAR(filename1,filename2,resolution):
    """filename1: ASAR data file, filename2: freeboard data file, resolution: data resolution"""
+def fit_freeboard_ASAR(filename1,filename2):
    """filename1: ASAR data file, filename2: freeboard data file
       creates new coordinate system defined by corners of ASAR image and selects freeboard values within ASAR image box
       returns an array containing normalized image coordinates and corresponding freeboard values:
       [x_coordinate, y_coordinate, freeboardheight(cm)]"""
-Line 20:
+Line 25:
-    lat1,lon1,lat2,lon2,lat3,lon3,lat4,lon4=read_asar_corners(filename1)
    
    ASAR_1=[lat1,lon1]      
    ASAR_2=[lat2,lon2]      
    ASAR_3=[lat3,lon3]      
    ASAR_4=[lat4,lon4]     

    ASAR_1p=mapll(ASAR_1[0],ASAR_1[1],sgn)  #computing polarstereographic coordinates
    ASAR_2p=mapll(ASAR_2[0],ASAR_2[1],sgn)
    ASAR_3p=mapll(ASAR_3[0],ASAR_3[1],sgn)
    ASAR_4p=mapll(ASAR_4[0],ASAR_4[1],sgn)

    X=int(abs(ASAR_2p[0]-ASAR_1p[0])/resolution)  #image size in pixel
    Y=int(abs(ASAR_4p[1]-ASAR_1p[1])/resolution)
+    ASAR=array(read_asar_corners(filename1))
    ASAR_p=zeros(8)
    for k in arange(0,7,2):       #computing polarstereographic coordinates
        ASAR_p[k:k+2]=mapll(ASAR[k],ASAR[k+1],sgn)
-Line 36:
+Line 31:
-    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])
+    y00,x00,y01,x01,y02,x02,y03,x03=int(ASAR_p[1]),int(ASAR_p[0]),int(ASAR_p[7]),int(ASAR_p[6]),int(ASAR_p[5]),int(ASAR_p[4]),int(ASAR_p[3]),int(ASAR_p[2])
-Line 48:
+Line 43:
-    # reading freeboard data
    lon=[]
    lat=[]
    fbh=[]
    datei = open (filename2, 'r')
    line=datei.readline()
    k=-1
    while line!="":
        k=k+1
        data=string.split(line)
        lon.append(float(data[0]))
        lat.append(abs(float(data[1])))
        fbh.append(float(data[2]))
        line=datei.readline()

    polar=mapll(array(lat),array(lon),sgn)
+    # reading freeboard data and computing geographic into polarstereographic coordinates
    ICESAT_p,fbh=read_icesat(filename2,sgn)
-Line 68:
+Line 49:
-    for x,y in zip(polar[0],polar[1]):
+    for x,y in zip(ICESAT_p[0],ICESAT_p[1]):
-Line 72:
+Line 53:
     # cutting off non-corresponding data values
-Line 91:
+Line 72:
+}}}
-Line 92:
+Line 74:
+{{{#!python
import string
from polar_projection import *
from scipy import io

def read_icesat(filename,sgn):
    data=io.read_array(filename)
    polar=mapll(data[:,1],data[:,0],sgn)
    fbh=data[:,2]
    return polar,fbh
-Line 93:
+Line 85:
+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'''

Zum Testen hängt man an das obige Programm folgende Zeilen an: 
{{{#!python
filename1='ASA_IMP_1PNDPA20060617_043346_000000162048_00362_22460_2136.N1'
filename2='LonLatFre_1706_6.xyz'
ergebnis=fit_freeboard_ASAR(filename1,filename2)
}}}

{{attachment:schemabild.jpg}}

{{attachment.schemabild2.jpg}}