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# This file contains several functions to read data from precise orbit files of sentinel-1 data.
# Scripts were created by Wu Wenhao, Wuhan university and adapted by Gert Mulder, TU Delft
import time
import calendar
import numpy as np
import os, sys
from scipy.interpolate import interp1d
import scipy.interpolate as inter
import calendar
def orbit_read(input_EOF_FileName):
try:
import xml.etree.cElementTree as etree
except:
try:
from lxml import etree
except:
#import xml.etree.ElementTree as etree
print('Failed to load lxml.etree or xml.etree.cElementTree')
sys.exit(1)
inTree = etree.parse(input_EOF_FileName)
queryList = {
# orbit inf
'Mission' : './/Earth_Explorer_Header/Fixed_Header/Mission',\
'Validity_Start': './/Earth_Explorer_Header/Fixed_Header/Validity_Period/Validity_Start',\
'Validity_Stop': './/Earth_Explorer_Header/Fixed_Header/Validity_Period/Validity_Stop',\
'orbitABS' : './/Data_Block/List_of_OSVs/OSV/Absolute_Orbit',\
'orbitTime': './/Data_Block/List_of_OSVs/OSV/UTC',\
'orbitX' : './/Data_Block/List_of_OSVs/OSV/X',\
'orbitY' : './/Data_Block/List_of_OSVs/OSV/Y',\
'orbitZ' : './/Data_Block/List_of_OSVs/OSV/Z',\
}
# temp variables and parameters
container = {}
# containerTemp = {}
events = ('end',)
for key in queryList.keys():
try:
vars()[key]
except KeyError or NameError:
vars()[key] = []
for nodes in inTree.findall(queryList[key]):
vars()[key].append(nodes.text)
container[key] = vars()[key]
return container
#--------------------------------------------------------
def interpolate_orbit(input_orbit_dir, date, input_orbit_type, input_interpolation_method, satellite='S1A'):
orbit_time = calendar.timegm(time.strptime(date,'%Y-%m-%dT%H:%M:%S.%f'))
date_start = calendar.timegm(time.strptime(date[:10],'%Y-%m-%d'))
if input_orbit_type == 'POE':
input_orbit_dir = os.path.join(input_orbit_dir, 'precise')
elif input_orbit_type == 'RES':
input_orbit_dir = os.path.join(input_orbit_dir, 'restituted')
L = os.listdir(input_orbit_dir)
Orbit_info = []
if input_orbit_type == 'POE' and satellite == 'S1A':
orbit_type = 'S1A_OPER_AUX_POEORB_OPOD_'
elif input_orbit_type == 'RES' and satellite == 'S1A':
orbit_type = 'S1A_OPER_AUX_RESORB_OPOD_'
elif input_orbit_type == 'POE' and satellite == 'S1B':
orbit_type = 'S1B_OPER_AUX_POEORB_OPOD_'
elif input_orbit_type == 'RES' and satellite == 'S1B':
orbit_type = 'S1B_OPER_AUX_RESORB_OPOD_'
for d in L:
if d.startswith(orbit_type):
start_time = calendar.timegm(time.strptime(d[42:57], '%Y%m%dT%H%M%S'))
end_time = calendar.timegm(time.strptime(d[58:73], '%Y%m%dT%H%M%S'))
if (start_time < orbit_time) and (end_time > orbit_time):
meta = orbit_read(os.path.join(input_orbit_dir, d))
print(d)
for i in range(len(meta['orbitTime'])):
point_time = calendar.timegm(time.strptime(meta['orbitTime'][i][4:-7], '%Y-%m-%dT%H:%M:%S'))
if (point_time > orbit_time-290) and (point_time < orbit_time+290):
Tuple_orbit=(float(hms2sec(meta['orbitTime'][i][4:].split('T')[1])),\
float(meta['orbitX'][i]), float(meta['orbitY'][i]),\
float(meta['orbitZ'][i]))
Orbit_info.append(Tuple_orbit)
set_list=[]
Orbit_info=sorted(Orbit_info)
for element in range(len(Orbit_info)-1):
temp_element =Orbit_info[element][0]
temp_element_add =Orbit_info[element+1][0]
if int(temp_element) != int(temp_element_add):
set_list.append(Orbit_info[element])
Orbit_info=set_list
orbit_Time=[]
orbit_X =[]
orbit_Y =[]
orbit_Z =[]
for element in Orbit_info:
orbit_Time.append(element[0])
orbit_X.append(element[1])
orbit_Y.append(element[2])
orbit_Z.append(element[3])
if len(orbit_X) == 0:
return [], orbit_X, orbit_Y, orbit_Z
del Orbit_info
orbit_Time=np.array(orbit_Time)
orbit_X =np.array(orbit_X)
orbit_Y =np.array(orbit_Y)
orbit_Z =np.array(orbit_Z)
if input_interpolation_method=='cubic':
spl_x=interp1d(orbit_Time,orbit_X,kind='cubic')
spl_y=interp1d(orbit_Time,orbit_Y,kind='cubic')
spl_z=interp1d(orbit_Time,orbit_Z,kind='cubic')
elif input_interpolation_method=='spline':
spl_x = inter.InterpolatedUnivariateSpline (orbit_Time,orbit_X)
spl_y = inter.InterpolatedUnivariateSpline (orbit_Time,orbit_Y)
spl_z = inter.InterpolatedUnivariateSpline (orbit_Time,orbit_Z)
input_time = np.arange((orbit_time - date_start) - 100, (orbit_time - date_start) + 100).astype(dtype='int32')
out_orbit_X=spl_x(input_time)
out_orbit_Y=spl_y(input_time)
out_orbit_Z=spl_z(input_time)
return input_time, out_orbit_X, out_orbit_Y, out_orbit_Z
#----------------------------------------------------------------
def hms2sec(hmsString,convertFlag='float'):
# input hmsString syntax: XX:XX:XX.xxxxxx
secString = int(hmsString[0:2])*3600 + \
int(hmsString[3:5])*60 + \
float(hmsString[6:])
if convertFlag == 'int' :
return int(secString)
elif convertFlag == 'float' :
return float(secString)
else:
return int(secString)
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