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 2025-06-22-22-12-43 cloud cover : 4.28%
INFO - L8 2025-06-22-22-12-43: sand: 0.00% ,whitewater: 7.58% ,water: 42.01%
INFO - L8 2025-06-22-22-12-43: 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 126
INFO - Number of shoreline points after removing points within 300m of cloud mask 92
INFO - Number of shoreline points before removing points within 30m of no data pixel 92
INFO - Number of shoreline points after removing points within 30m of no data pixel 90
INFO - L8 2025-07-15-22-19-01 cloud cover : 0.00%
INFO - L8 2025-07-15-22-19-01: sand: 0.00% ,whitewater: 27.78% ,water: 20.03%
INFO - L8 2025-07-15-22-19-01: 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: 1 shorelines
INFO - Number of shoreline points before removing points within 300m of cloud mask 156
INFO - Number of shoreline points after removing points within 300m of cloud mask 156
INFO - Number of shoreline points before removing points within 30m of no data pixel 156
INFO - Number of shoreline points after removing points within 30m of no data pixel 154
INFO - Extracting shorelines for L9 Minimum Shoreline Length: 500


INFO - L9 2025-06-21-22-18-50 cloud cover : 0.00%
INFO - L9 2025-06-21-22-18-50: sand: 0.00% ,whitewater: 0.00% ,water: 6.30%
INFO - L9 2025-06-21-22-18-50: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L9 2025-06-21-22-18-50: 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 2025-06-30-22-12-43 cloud cover : 9.84%
INFO - L9 2025-06-30-22-12-43: sand: 0.00% ,whitewater: 12.66% ,water: 30.56%
INFO - L9 2025-06-30-22-12-43: 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 89
INFO - Number of shoreline points before removing points within 30m of no data pixel 89
INFO - Number of shoreline points after removing points within 30m of no data pixel 87
INFO - L9 2025-07-07-22-18-55 cloud cover : 0.00%
INFO - L9 2025-07-07-22-18-55: sand: 0.00% ,whitewater: 0.62% ,water: 49.95%
INFO - L9 2025-07-07-22-18-55: 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 174
INFO - Number of shoreline points after removing points within 300m of cloud mask 174
INFO - Number of shoreline points before removing points within 30m of no data pixel 174
INFO - Number of shoreline points after removing points within 30m of no data pixel 172
INFO - L9 2025-07-23-22-19-03 cloud cover : 0.00%
INFO - L9 2025-07-23-22-19-03: sand: 0.00% ,whitewater: 1.20% ,water: 50.11%
INFO - L9 2025-07-23-22-19-03: 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 169
INFO - Number of shoreline points after removing points within 300m of cloud mask 169
INFO - Number of shoreline points before removing points within 30m of no data pixel 169
INFO - Number of shoreline points after removing points within 30m of no data pixel 167