s1_burst_slc: add __str__ and bbox properties (#72)

* s1_burst_slc: add __str__ and bbox properties

* provide more detail for bbox return values

Author: scottstanie

src/s1reader/s1_burst_slc.py

@@ -172,6 +172,11 @@ class Sentinel1BurstSlc:
     burst_noise: s1_annotation.BurstNoise #Thermal noise correction
     burst_eap: s1_annotation.BurstEAP #EAP correction
 
+    def __str__(self):
+        return f"Sentinel1BurstSlc: {self.burst_id} at {self.sensing_start}"
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}(burst_id={self.burst_id})"
 
     def as_isce3_radargrid(self):
         '''Init and return isce3.product.RadarGridParameters.
@@ -622,3 +627,9 @@ def swath_name(self):
         '''Swath name in iw1, iw2, iw3.'''
         return self.burst_id.split('_')[1]
 
+    @property
+    def bbox(self):
+        '''Returns the (west, south, east, north) bounding box of the burst.'''
+        # Uses https://shapely.readthedocs.io/en/stable/manual.html#object.bounds
+        # Returns a tuple of 4 floats representing (west, south, east, north) in degrees.
+        return self.border[0].bounds