diff --git a/components/isceobj/Sensor/GRD/Sentinel1.py b/components/isceobj/Sensor/GRD/Sentinel1.py
index 45e648b..00f9195 100755
--- a/components/isceobj/Sensor/GRD/Sentinel1.py
+++ b/components/isceobj/Sensor/GRD/Sentinel1.py
@@ -261,10 +261,10 @@ class Sentinel1(Component):
 
         self.validateUserInputs()
 
-        if self.xml.startswith('/vsizip'): #Read from zip file
+        if '.zip' in self.xml:
             try:
                 parts = self.xml.split(os.path.sep)
-                zipname = os.path.join(*(parts[2:-3]))
+                zipname = os.path.join('/',*(parts[:-3]))
                 fname = os.path.join(*(parts[-3:]))
 
                 with zipfile.ZipFile(zipname, 'r') as zf:
@@ -291,8 +291,10 @@ class Sentinel1(Component):
         
         ####Read in the orbits
         if self.orbitFile:
-            orb = self.extractPreciseOrbit()
-        else:
+            try:
+                orb = self.extractPreciseOrbit()
+            except:
+                pass
             orb = self.extractOrbit()
 
         self.product.orbit.setOrbitSource('Header')
@@ -423,10 +425,11 @@ class Sentinel1(Component):
 
         nsp = "{http://www.esa.int/safe/sentinel-1.0}"
 
-        if self.manifest.startswith('/vsizip'):
+        if '.zip' in self.manifest:
+
             import zipfile    
             parts = self.manifest.split(os.path.sep)
-            zipname = os.path.join(*(parts[2:-2]))
+            zipname = os.path.join('/',*(parts[:-2]))
             fname = os.path.join(*(parts[-2:]))
 
             try:
@@ -516,13 +519,7 @@ class Sentinel1(Component):
             vec.setVelocity(vel)
             frameOrbit.addStateVector(vec)
 
-
-        orbExt = OrbitExtender(planet=Planet(pname='Earth'))
-        orbExt.configure()
-        newOrb = orbExt.extendOrbit(frameOrbit)
-
-
-        return newOrb
+        return frameOrbit
             
     def extractPreciseOrbit(self):
         '''
@@ -533,10 +530,9 @@ class Sentinel1(Component):
         except IOError as strerr:
             print("IOError: %s" % strerr)
             return
-
-        _xml_root = ElementTree(file=fp).getroot()
+        #_xml_root = ElementTree(file=fp).getroot()
        
-        node = _xml_root.find('Data_Block/List_of_OSVs')
+        node = self._xml_root.find('Data_Block/List_of_OSVs')
 
         print('Extracting orbit from Orbit File: ', self.orbitFile)
         orb = Orbit()
@@ -582,10 +578,10 @@ class Sentinel1(Component):
         if self.calibrationXml is None:
             raise Exception('No calibration file provided')
 
-        if self.calibrationXml.startswith('/vsizip'):
+        if '.zip' in self.calibrationXml:
             import zipfile
             parts = self.calibrationXml.split(os.path.sep)
-            zipname = os.path.join(*(parts[2:-4]))
+            zipname = os.path.join('/',*(parts[:-4]))
             fname = os.path.join(*(parts[-4:]))
             
             try:
@@ -723,7 +719,7 @@ class Sentinel1(Component):
 
         print('Extracting normalized image ....')
 
-        src = gdal.Open(self.tiff.strip(), gdal.GA_ReadOnly)
+        src = gdal.Open('/vsizip//'+self.tiff.strip(), gdal.GA_ReadOnly)
         band = src.GetRasterBand(1)
 
         if self.product.numberOfSamples != src.RasterXSize: