Use 0 for water missing tiles, not 1 (#16)

* write zeros, not ones, for water

* version for water change

Author: scottstanie

sardem/download.py

@@ -367,10 +367,9 @@ def _write_zeros(self, local_filename):
         shape = (3601, 3601)
         if self.data_source == "NASA_WATER":
             dtype = np.uint8
-            data = np.ones(shape, dtype=dtype) * 255
         else:
             dtype = np.int16
-            data = np.zeros(shape, dtype=dtype)
+        data = np.zeros(shape, dtype=dtype)
         data.tofile(local_filename)
 
     def download_all(self):

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="sardem",
-    version="0.11.2",
+    version="0.11.3",
     author="Scott Staniewicz",
     author_email="scott.stanie@gmail.com",
     description="Create upsampled DEMs for InSAR processing",