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 2025-06-24-10-05-27 cloud cover : 0.00%
INFO - L8 2025-06-24-10-05-27: sand: 0.00% ,whitewater: 0.00% ,water: 50.02%
INFO - L8 2025-06-24-10-05-27: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 112
INFO - Number of shoreline points after removing points within 300m of cloud mask 112
INFO - Number of shoreline points before removing points within 30m of no data pixel 112
INFO - Number of shoreline points after removing points within 30m of no data pixel 112
INFO - L8 2025-06-24-10-05-51 cloud cover : 0.00%
INFO - L8 2025-06-24-10-05-51: sand: 0.00% ,whitewater: 0.00% ,water: 49.89%
INFO - L8 2025-06-24-10-05-51: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 114
INFO - Number of shoreline points after removing points within 300m of cloud mask 114
INFO - Number of shoreline points before removing points within 30m of no data pixel 114
INFO - Number of shoreline points after removing points within 30m of no data pixel 114
INFO - L8 2025-07-01-10-11-40 cloud cover : 0.00%
INFO - L8 2025-07-01-10-11-40: sand: 0.00% ,whitewater: 0.00% ,water: 48.59%
INFO - L8 2025-07-01-10-11-40: 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: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 115
INFO - Number of shoreline points after removing points within 300m of cloud mask 115
INFO - Number of shoreline points before removing points within 30m of no data pixel 115
INFO - Number of shoreline points after removing points within 30m of no data pixel 115
INFO - L8 2025-07-10-10-05-30 cloud cover : 0.00%
INFO - L8 2025-07-10-10-05-30: sand: 0.22% ,whitewater: 0.00% ,water: 50.72%
INFO - L8 2025-07-10-10-05-30: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 112
INFO - Number of shoreline points after removing points within 300m of cloud mask 112
INFO - Number of shoreline points before removing points within 30m of no data pixel 112
INFO - Number of shoreline points after removing points within 30m of no data pixel 112
INFO - L8 2025-07-10-10-05-54 cloud cover : 0.00%
INFO - L8 2025-07-10-10-05-54: sand: 0.00% ,whitewater: 0.00% ,water: 50.46%
INFO - L8 2025-07-10-10-05-54: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 113
INFO - Number of shoreline points after removing points within 300m of cloud mask 113
INFO - Number of shoreline points before removing points within 30m of no data pixel 113
INFO - Number of shoreline points after removing points within 30m of no data pixel 113
WARNING - L8 2025-07-17-10-11-45: Skipped due to cloud cover 18.77% > threshold 10.00%
INFO - L8 2025-07-17-10-12-09 cloud cover : 0.00%
INFO - L8 2025-07-17-10-12-09: sand: 0.00% ,whitewater: 1.36% ,water: 8.64%
INFO - L8 2025-07-17-10-12-09: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L8 2025-07-17-10-12-09: 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 - Extracting shorelines for L9 Minimum Shoreline Length: 500


INFO - L9 2025-07-02-10-05-27 cloud cover : 0.00%
INFO - L9 2025-07-02-10-05-27: sand: 0.00% ,whitewater: 0.00% ,water: 49.85%
INFO - L9 2025-07-02-10-05-27: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 117
INFO - Number of shoreline points after removing points within 300m of cloud mask 117
INFO - Number of shoreline points before removing points within 30m of no data pixel 117
INFO - Number of shoreline points after removing points within 30m of no data pixel 117
INFO - L9 2025-07-02-10-05-51 cloud cover : 0.00%
INFO - L9 2025-07-02-10-05-51: sand: 0.00% ,whitewater: 0.00% ,water: 49.63%
INFO - L9 2025-07-02-10-05-51: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 118
INFO - Number of shoreline points after removing points within 300m of cloud mask 118
INFO - Number of shoreline points before removing points within 30m of no data pixel 118
INFO - Number of shoreline points after removing points within 30m of no data pixel 118
INFO - L9 2025-07-09-10-11-38 cloud cover : 0.00%
INFO - L9 2025-07-09-10-11-38: sand: 0.35% ,whitewater: 2.17% ,water: 48.98%
INFO - L9 2025-07-09-10-11-38: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 3 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 111
INFO - Number of shoreline points after removing points within 300m of cloud mask 111
INFO - Number of shoreline points before removing points within 30m of no data pixel 111
INFO - Number of shoreline points after removing points within 30m of no data pixel 111
WARNING - L9 2025-07-09-10-12-02: Skipped due to cloud cover 44.63% > threshold 10.00%
INFO - L9 2025-07-18-10-05-33 cloud cover : 0.00%
INFO - L9 2025-07-18-10-05-33: sand: 0.22% ,whitewater: 0.00% ,water: 51.67%
INFO - L9 2025-07-18-10-05-33: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 2 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 103
INFO - Number of shoreline points after removing points within 300m of cloud mask 103
INFO - Number of shoreline points before removing points within 30m of no data pixel 103
INFO - Number of shoreline points after removing points within 30m of no data pixel 103
INFO - L9 2025-07-18-10-05-57 cloud cover : 0.00%
INFO - L9 2025-07-18-10-05-57: sand: 0.35% ,whitewater: 0.00% ,water: 51.50%
INFO - L9 2025-07-18-10-05-57: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
INFO - Number of shorelines before removing shorelines < 500m: 1 shorelines. Number of shorelines after filtering shorelines: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 112
INFO - Number of shoreline points after removing points within 300m of cloud mask 112
INFO - Number of shoreline points before removing points within 30m of no data pixel 112
INFO - Number of shoreline points after removing points within 30m of no data pixel 112
WARNING - L9 2025-07-25-10-11-47: Skipped due to cloud cover 20.17% > threshold 10.00%
INFO - L9 2025-07-25-10-12-11 cloud cover : 0.00%
INFO - L9 2025-07-25-10-12-11: sand: 0.00% ,whitewater: 0.00% ,water: 9.55%
INFO - L9 2025-07-25-10-12-11: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L9 2025-07-25-10-12-11: 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.