stripmapStack: expose --filter_strength option in stackStripMap

expose the -f / --filter_strength option in the parser to user so that one is able to change the filtering strength. Default is setted as the hardwired value - 0.8, so previous setting won't be affected.

contrib/stack/stripmapStack/Stack.py

@@ -575,7 +575,7 @@ class run(object):
              configObj.igram = configObj.outDir+'.int'
              configObj.filtIgram = os.path.dirname(configObj.outDir) + '/filt_' + pair[0] + '_'  + pair[1] + '.int'
              configObj.coherence = os.path.dirname(configObj.outDir) + '/filt_' + pair[0] + '_'  + pair[1] + '.cor'
-             configObj.filtStrength = filtStrength
+             #configObj.filtStrength = filtStrength
              configObj.filterCoherence('[Function-2]')
 
              configObj.igram = configObj.filtIgram

contrib/stack/stripmapStack/stackStripMap.py

@@ -56,6 +56,11 @@ def createParser():
             help='sub-band band width')
     parser.add_argument('-u', '--unw_method', dest='unwMethod', type=str, default='snaphu'
        , help='unwrapping method (icu, snaphu, or snaphu2stage)')
+
+    parser.add_argument('-f','--filter_strength', dest='filtStrength', type=str, default=filtStrength,
+            help='strength of Goldstein filter applied to the wrapped phase before spatial coherence estimation.'
+                 ' Default: {}'.format(filtStrength))
+
     parser.add_argument('--filter_sigma_x', dest='filterSigmaX', type=str, default='100'
        , help='filter sigma for gaussian filtering the dispersive and nonDispersive phase')