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 2025-05-23-10-05-12 cloud cover : 0.00% INFO - L8 2025-05-23-10-05-12: sand: 0.00% ,whitewater: 0.00% ,water: 0.00% INFO - L8 2025-05-23-10-05-12: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 ERROR - L8 2025-05-23-10-05-12: 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 - L8 2025-05-23-10-05-35 cloud cover : 0.00% INFO - L8 2025-05-23-10-05-35: sand: 0.00% ,whitewater: 0.07% ,water: 23.62% INFO - L8 2025-05-23-10-05-35: 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: 2 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 89 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 89 INFO - L8 2025-05-30-10-11-23 cloud cover : 0.00% INFO - L8 2025-05-30-10-11-23: sand: 0.00% ,whitewater: 0.00% ,water: 36.03% INFO - L8 2025-05-30-10-11-23: 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 116 INFO - Number of shoreline points after removing points within 300m of cloud mask 116 INFO - Number of shoreline points before removing points within 30m of no data pixel 116 INFO - Number of shoreline points after removing points within 30m of no data pixel 116 INFO - L8 2025-05-30-10-11-47 cloud cover : 0.00% INFO - L8 2025-05-30-10-11-47: sand: 0.00% ,whitewater: 0.00% ,water: 36.03% INFO - L8 2025-05-30-10-11-47: 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 - Extracting shorelines for L9 Minimum Shoreline Length: 500 INFO - L9 2025-05-31-10-05-10 cloud cover : 0.00% INFO - L9 2025-05-31-10-05-10: sand: 0.00% ,whitewater: 0.00% ,water: 39.81% INFO - L9 2025-05-31-10-05-10: 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: 0 shorelines INFO - L9 2025-05-31-10-05-34 cloud cover : 0.00% INFO - L9 2025-05-31-10-05-34: sand: 0.00% ,whitewater: 0.00% ,water: 37.70% INFO - L9 2025-05-31-10-05-34: 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 101 INFO - Number of shoreline points after removing points within 300m of cloud mask 101 INFO - Number of shoreline points before removing points within 30m of no data pixel 101 INFO - Number of shoreline points after removing points within 30m of no data pixel 101 INFO - L9 2025-06-07-10-11-21 cloud cover : 0.00% INFO - L9 2025-06-07-10-11-21: sand: 0.00% ,whitewater: 0.00% ,water: 32.82% INFO - L9 2025-06-07-10-11-21: 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 116 INFO - Number of shoreline points after removing points within 300m of cloud mask 116 INFO - Number of shoreline points before removing points within 30m of no data pixel 116 INFO - Number of shoreline points after removing points within 30m of no data pixel 116 INFO - L9 2025-06-07-10-11-45 cloud cover : 0.00% INFO - L9 2025-06-07-10-11-45: sand: 0.00% ,whitewater: 0.00% ,water: 32.89% INFO - L9 2025-06-07-10-11-45: 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 116 INFO - Number of shoreline points after removing points within 300m of cloud mask 116 INFO - Number of shoreline points before removing points within 30m of no data pixel 116 INFO - Number of shoreline points after removing points within 30m of no data pixel 116