Burst id and absolute orbit number (#64)

* Format change on `burst_id`; keeping the absolute orbit number inside `Sentinel1BurstSlc`

* updates on test_bursts.py

Co-authored-by: Seongsu Jeong <[email protected]>

Author: seongsujeong

src/s1reader/s1_burst_slc.py

@@ -152,6 +152,7 @@ class Sentinel1BurstSlc:
     border: list # list of lon, lat coordinate tuples (in degrees) representing burst border
     orbit: isce3.core.Orbit
     orbit_direction: str
+    abs_orbit_number: int  # Absolute orbit number
     # VRT params
     tiff_path: str  # path to measurement tiff in SAFE/zip
     i_burst: int

src/s1reader/s1_reader.py

@@ -487,7 +487,7 @@ def burst_from_xml(annotation_path: str, orbit_path: str, tiff_path: str,
                           last_valid_samples[last_line])
 
 
-        burst_id = f't{track_number}_{id_burst}_{subswath_id.lower()}'
+        burst_id = f't{track_number:03d}_{id_burst}_{subswath_id.lower()}'
 
 
         #Extract burst-wise information for Calibration, Noise, and EAP correction
@@ -502,7 +502,7 @@ def burst_from_xml(annotation_path: str, orbit_path: str, tiff_path: str,
                                       (n_lines, n_samples), az_fm_rate, doppler,
                                       rng_processing_bandwidth, pol, burst_id,
                                       platform_id, center_pts[i],
-                                      boundary_pts[i], orbit, orbit_direction,
+                                      boundary_pts[i], orbit, orbit_direction, orbit_number,
                                       tiff_path, i, first_valid_sample,
                                       last_sample, first_valid_line, last_line,
                                       range_window_type, range_window_coeff,

tests/test_bursts.py

@@ -28,9 +28,10 @@ def test_burst(bursts):
         [-2056.701472691132, 353389.9614836443, -54143009.57327797]]
 
     for i, burst in enumerate(bursts):
-        expected_burst_id = f't71_{151200 + i}_iw3'
+        expected_burst_id = f't071_{151200 + i}_iw3'
         assert burst.burst_id == expected_burst_id
         assert burst.i_burst == i
+        assert burst.abs_orbit_number == 32518
 
         assert burst.radar_center_frequency == 5405000454.33435
         assert burst.wavelength == 0.05546576