Update ODR.py

The arclist file in the more complete ODR orbit files downloaded from http://www.deos.tudelft.nl/AS/pieter/Local/ERS/index.html (contains ERS-2 orbit files beyond 2003) has slight format change and the original hard coded line parser no longer works. The updated version should work both for the new and old versions of arclist.

components/isceobj/Orbit/ODR.py

@@ -184,15 +184,17 @@ def parse(self):
 
     def parseLine(self,line):        
         arc = Arc()
-        arc.number = line[0:3] # Arc number
-        arc.start = datetime.datetime.strptime(line[5:17],'%y%m%d %H:%M') # Starting time for the arc
-        arc.stop = datetime.datetime.strptime(line[20:32],'%y%m%d %H:%M') # End time for the arc
-        arc.slrResidual = line[34:38] # Satellite laser ranging residual in cm        
-        arc.crossOver = line[39:43]
-        arc.altimeter = line[45:49]
-        arc.repeat = line[51:57] # Repeat cycle in days
-        arc.version = line[58:61] # Version number
-        arc.precise = datetime.datetime.strptime(line[63:78],'%y%m%d %H:%M:%S') # Starting time of the precise segment of the arc
+        ###### Change to also work for the new arclist format in the recalcuated ODR orbit files.#######
+        arc.number = line.split()[0] # Arc number
+        arc.start = datetime.datetime.strptime(" ".join(line.split()[1:3]),'%y%m%d %H:%M') # Starting time for the arc
+        arc.stop = datetime.datetime.strptime(" ".join(line.split()[4:6]),'%y%m%d %H:%M') # End time for the arc
+        ###### commented the following because it is not always present in the new arclist file ############
+        # arc.slrResidual = line[34:38] # Satellite laser ranging residual in cm        
+        # arc.crossOver = line[39:43]
+        # arc.altimeter = line[45:49]
+        # arc.repeat = line[51:57] # Repeat cycle in days
+        # arc.version = line[58:61] # Version number
+        arc.precise = datetime.datetime.strptime(" ".join(line.split()[-2:]),'%y%m%d %H:%M:%S') # Starting time of the precise segment of the arc
 
         return arc