save_kmz: support data in UTM (#1210)

* convert UTM coords to WGS84 in write_kmz_overlay

* check for UTM_ZONE in metadata before converting bbox coords to wgs84

* undo extensive formatting

* empty line at end of file

* fix end of file

src/mintpy/save_kmz.py

@@ -233,6 +233,10 @@ def write_kmz_overlay(data, meta, out_file, inps):
     """
 
     south, north, west, east = ut.four_corners(meta)
+    # convert from UTM to WGS84 when necessary, as KML only natively supports WGS84
+    if "UTM_ZONE" in meta.keys():
+        north, east = ut.utm2latlon(meta, east, north)
+        south, west = ut.utm2latlon(meta, west, south)
 
     # 1. Make PNG file - Data
     print('plotting data ...')