Added code to stripmapStack/topo.py to work with newer GDAL (#196)

* added option to pass segment number through unpackFrame_UAVSAR

* changed type of segment number

* changed segment type in prepareUAVSAR_coregstack

* Revert "changed type of segment number"

This reverts commit a18c6452d4b5c95ce869dab2ee1e3bcf6ff2b1d9.

* Revert "changed segment type in prepareUAVSAR_coregstack"

This reverts commit 6cf3ebadb3a6e119c6084c8e03b8cc68d7eccc3f.

* changed type of segment number in unpackFrame_UAVSAR

* Added code to stripmapStack/topo.py to explicitly create the `geom_reference/hgt.rdr.vrt` file to work with newer GDAL

contrib/stack/stripmapStack/topo.py

@@ -13,6 +13,10 @@ from isceobj.Constants import SPEED_OF_LIGHT
 from isceobj.Util.Poly2D import Poly2D
 
 
+gdal.UseExceptions()
+
+
+
 def createParser():
     '''
     Command line parser.
@@ -416,6 +420,8 @@ def runMultilook(in_dir, out_dir, alks, rlks, in_ext='.rdr', out_ext='.rdr', met
                 options_str = '-of ENVI -a_nodata 0 -outsize {ox} {oy} -srcwin 0 0 {sx} {sy} '.format(
                     ox=out_wid, oy=out_len, sx=src_wid, sy=src_len)
                 gdal.Translate(out_file, ds, options=options_str)
+                dso = gdal.Open(out_file, gdal.GA_ReadOnly)
+                gdal.Translate(out_file+'.vrt', dso, options=gdal.TranslateOptions(format='VRT'))
 
                 # generate ISCE .xml file
                 if not os.path.isfile(out_file+'.xml'):