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


ERROR - Skipping L8 2025-04-05-22-00-41 due to cloud cover percentage exceeding cloud threshold: 38.41% > 10.00%.


INFO - Extracting shorelines for L9 Minimum Shoreline Length: 500


INFO - 
Processing image L9 2025-04-13-22-00-31
INFO - L9 2025-04-13-22-00-31 cloud cover : 0.00%
INFO - L9 2025-04-13-22-00-31: sand: 0.00% ,whitewater: 0.00% ,water: 0.00%
INFO - L9 2025-04-13-22-00-31: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1
ERROR - L9 2025-04-13-22-00-31: 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/python3.10/site-packages/coastsat/SDS_shoreline.py", line 686, in extract_shorelines
    contours_mwi, t_mndwi = find_wl_contours1(
  File "/home/ubuntu/.local/lib/python3.10/site-packages/coastsat/SDS_shoreline.py", line 981, in find_wl_contours1
    raise ValueError("no valid pixels found in reference shoreline buffer.")
ValueError: no valid pixels found in reference shoreline buffer.

INFO - 
Processing image L9 2025-04-13-22-00-55
INFO - L9 2025-04-13-22-00-55 cloud cover : 0.00%
INFO - L9 2025-04-13-22-00-55: sand: 0.00% ,whitewater: 0.03% ,water: 62.91%
INFO - L9 2025-04-13-22-00-55: 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 518
INFO - Number of shoreline points after removing points within 300m of cloud mask 518
INFO - Number of shoreline points before removing points within 30m of no data pixel 518
INFO - Number of shoreline points after removing points within 30m of no data pixel 518