INFO - Please read the following information carefully:

INFO - find_wl_contours2: A method for extracting shorelines that uses the sand water interface detected with the model to refine the threshold that's used to detect shorelines .
  - This is the default method used when there are enough sand pixels within the reference shoreline buffer.

INFO - find_wl_contours1: This shoreline extraction method uses a threshold to differentiate between water and land pixels in images, relying on Modified Normalized Difference Water Index (MNDWI) values. However, it may inaccurately classify snow and ice as water, posing a limitation in certain environments.
  - This is only used when not enough sand pixels are detected within the reference shoreline buffer.

INFO - ---------------------------------------------------------------------------------------------------------------------
INFO - Extracting shorelines for L5 Minimum Shoreline Length: 500


INFO - WARNING: CoastSat has hard-coded the value for the minimum shoreline length for L7 to 200


INFO - Extracting shorelines for L7 Minimum Shoreline Length: 200


INFO - Extracting shorelines for L8 Minimum Shoreline Length: 500


INFO - L8 2025-07-24-22-13-17 cloud cover : 0.00%
INFO - L8 2025-07-24-22-13-17: sand: 0.00% ,whitewater: 0.01% ,water: 57.82%
INFO - L8 2025-07-24-22-13-17: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 19 shorelines. Number of shorelines after filtering shorelines: 3 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 600
INFO - Number of shoreline points after removing points within 300m of cloud mask 600
INFO - Number of shoreline points before removing points within 30m of no data pixel 600
INFO - Number of shoreline points after removing points within 30m of no data pixel 600
INFO - L8 2025-07-24-22-13-41 cloud cover : 0.00%
INFO - L8 2025-07-24-22-13-41: sand: 0.00% ,whitewater: 0.02% ,water: 57.61%
INFO - L8 2025-07-24-22-13-41: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 18 shorelines. Number of shorelines after filtering shorelines: 3 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 598
INFO - Number of shoreline points after removing points within 300m of cloud mask 598
INFO - Number of shoreline points before removing points within 30m of no data pixel 598
INFO - Number of shoreline points after removing points within 30m of no data pixel 598
INFO - L8 2025-07-31-22-19-29 cloud cover : 0.00%
INFO - L8 2025-07-31-22-19-29: sand: 0.00% ,whitewater: 2.71% ,water: 56.19%
INFO - L8 2025-07-31-22-19-29: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 20 shorelines. Number of shorelines after filtering shorelines: 4 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 676
INFO - Number of shoreline points after removing points within 300m of cloud mask 676
INFO - Number of shoreline points before removing points within 30m of no data pixel 676
INFO - Number of shoreline points after removing points within 30m of no data pixel 676
INFO - L8 2025-07-31-22-19-53 cloud cover : 0.00%
INFO - L8 2025-07-31-22-19-53: sand: 0.00% ,whitewater: 0.59% ,water: 12.68%
INFO - L8 2025-07-31-22-19-53: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 5 shorelines. Number of shorelines after filtering shorelines: 2 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 96
INFO - Number of shoreline points after removing points within 300m of cloud mask 96
INFO - Number of shoreline points before removing points within 30m of no data pixel 96
INFO - Number of shoreline points after removing points within 30m of no data pixel 95
INFO - L8 2025-08-09-22-13-25 cloud cover : 0.00%
INFO - L8 2025-08-09-22-13-25: sand: 0.00% ,whitewater: 4.89% ,water: 52.69%
INFO - L8 2025-08-09-22-13-25: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 18 shorelines. Number of shorelines after filtering shorelines: 4 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 688
INFO - Number of shoreline points after removing points within 300m of cloud mask 688
INFO - Number of shoreline points before removing points within 30m of no data pixel 688
INFO - Number of shoreline points after removing points within 30m of no data pixel 688
INFO - L8 2025-08-09-22-13-49 cloud cover : 0.00%
INFO - L8 2025-08-09-22-13-49: sand: 0.00% ,whitewater: 5.10% ,water: 52.35%
INFO - L8 2025-08-09-22-13-49: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 18 shorelines. Number of shorelines after filtering shorelines: 4 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 688
INFO - Number of shoreline points after removing points within 300m of cloud mask 688
INFO - Number of shoreline points before removing points within 30m of no data pixel 688
INFO - Number of shoreline points after removing points within 30m of no data pixel 688
INFO - Extracting shorelines for L9 Minimum Shoreline Length: 500


INFO - L9 2025-08-01-22-13-18 cloud cover : 0.88%
INFO - L9 2025-08-01-22-13-18: sand: 0.00% ,whitewater: 4.33% ,water: 54.51%
INFO - L9 2025-08-01-22-13-18: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 27 shorelines. Number of shorelines after filtering shorelines: 4 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 595
INFO - Number of shoreline points after removing points within 300m of cloud mask 528
INFO - Number of shoreline points before removing points within 30m of no data pixel 528
INFO - Number of shoreline points after removing points within 30m of no data pixel 528
INFO - L9 2025-08-01-22-13-42 cloud cover : 0.00%
INFO - L9 2025-08-01-22-13-42: sand: 0.00% ,whitewater: 4.82% ,water: 54.47%
INFO - L9 2025-08-01-22-13-42: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 28 shorelines. Number of shorelines after filtering shorelines: 4 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 675
INFO - Number of shoreline points after removing points within 300m of cloud mask 675
INFO - Number of shoreline points before removing points within 30m of no data pixel 675
INFO - Number of shoreline points after removing points within 30m of no data pixel 675
INFO - L9 2025-08-08-22-19-36 cloud cover : 0.00%
INFO - L9 2025-08-08-22-19-36: sand: 0.00% ,whitewater: 12.23% ,water: 44.70%
INFO - L9 2025-08-08-22-19-36: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 22 shorelines. Number of shorelines after filtering shorelines: 2 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 660
INFO - Number of shoreline points after removing points within 300m of cloud mask 660
INFO - Number of shoreline points before removing points within 30m of no data pixel 660
INFO - Number of shoreline points after removing points within 30m of no data pixel 660
INFO - L9 2025-08-08-22-20-00 cloud cover : 0.00%
INFO - L9 2025-08-08-22-20-00: sand: 0.00% ,whitewater: 0.11% ,water: 20.11%
INFO - L9 2025-08-08-22-20-00: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L9 2025-08-08-22-20-00: Could not map shoreline due to error no valid pixels found in reference shoreline buffer.
Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 1061, in extract_shorelines
    shoreline, t_mndwi = find_shoreline_optical(
                         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 216, in find_shoreline_optical
    contours_mwi, t_mndwi = find_wl_contours1(im_mndwi, cloud_mask, im_ref_buffer)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 1426, in find_wl_contours1
    raise ValueError("no valid pixels found in reference shoreline buffer.")
ValueError: no valid pixels found in reference shoreline buffer.

INFO - L9 2025-08-24-22-19-42 cloud cover : 0.00%
INFO - L9 2025-08-24-22-19-42: sand: 0.00% ,whitewater: 3.08% ,water: 50.33%
INFO - L9 2025-08-24-22-19-42: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 7 shorelines. Number of shorelines after filtering shorelines: 3 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 608
INFO - Number of shoreline points after removing points within 300m of cloud mask 608
INFO - Number of shoreline points before removing points within 30m of no data pixel 608
INFO - Number of shoreline points after removing points within 30m of no data pixel 608
INFO - L9 2025-08-24-22-20-06 cloud cover : 0.00%
INFO - L9 2025-08-24-22-20-06: sand: 0.00% ,whitewater: 0.00% ,water: 18.49%
INFO - L9 2025-08-24-22-20-06: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L9 2025-08-24-22-20-06: Could not map shoreline due to error no valid pixels found in reference shoreline buffer.
Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 1061, in extract_shorelines
    shoreline, t_mndwi = find_shoreline_optical(
                         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 216, in find_shoreline_optical
    contours_mwi, t_mndwi = find_wl_contours1(im_mndwi, cloud_mask, im_ref_buffer)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/.local/lib/python3.12/site-packages/coastsat/SDS_shoreline.py", line 1426, in find_wl_contours1
    raise ValueError("no valid pixels found in reference shoreline buffer.")
ValueError: no valid pixels found in reference shoreline buffer.