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 WARNING - L8 2025-08-07-22-26-09: Skipped due to cloud cover 53.97% > threshold 10.00% WARNING - L8 2025-08-07-22-26-33: Skipped due to cloud cover 55.65% > threshold 10.00% INFO - L8 2025-08-16-22-20-26 cloud cover : 0.00% INFO - L8 2025-08-16-22-20-26: sand: 0.00% ,whitewater: 0.00% ,water: 2.57% INFO - L8 2025-08-16-22-20-26: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 ERROR - L8 2025-08-16-22-20-26: 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. WARNING - L8 2025-08-23-22-26-13: Skipped due to cloud cover 63.44% > threshold 10.00% WARNING - L8 2025-08-23-22-26-37: Skipped due to cloud cover 52.17% > threshold 10.00% INFO - Extracting shorelines for L9 Minimum Shoreline Length: 500 INFO - L9 2025-07-30-22-26-03 cloud cover : 2.91% INFO - L9 2025-07-30-22-26-03: sand: 0.00% ,whitewater: 0.87% ,water: 53.77% INFO - L9 2025-07-30-22-26-03: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 37 shorelines. Number of shorelines after filtering shorelines: 4 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 1269 INFO - Number of shoreline points after removing points within 300m of cloud mask 1026 INFO - Number of shoreline points before removing points within 30m of no data pixel 1026 INFO - Number of shoreline points after removing points within 30m of no data pixel 1026 INFO - L9 2025-07-30-22-26-27 cloud cover : 2.68% INFO - L9 2025-07-30-22-26-27: sand: 0.00% ,whitewater: 0.95% ,water: 53.63% INFO - L9 2025-07-30-22-26-27: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 33 shorelines. Number of shorelines after filtering shorelines: 4 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 1277 INFO - Number of shoreline points after removing points within 300m of cloud mask 1069 INFO - Number of shoreline points before removing points within 30m of no data pixel 1069 INFO - Number of shoreline points after removing points within 30m of no data pixel 1069 INFO - L9 2025-08-08-22-20-24 cloud cover : 0.00% INFO - L9 2025-08-08-22-20-24: sand: 0.00% ,whitewater: 0.50% ,water: 9.19% INFO - L9 2025-08-08-22-20-24: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 6 shorelines. Number of shorelines after filtering shorelines: 3 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 401 INFO - Number of shoreline points after removing points within 300m of cloud mask 401 INFO - Number of shoreline points before removing points within 30m of no data pixel 401 INFO - Number of shoreline points after removing points within 30m of no data pixel 397 INFO - L9 2025-08-24-22-20-30 cloud cover : 0.00% INFO - L9 2025-08-24-22-20-30: sand: 0.00% ,whitewater: 0.00% ,water: 12.35% INFO - L9 2025-08-24-22-20-30: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 34 shorelines. Number of shorelines after filtering shorelines: 4 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 430 INFO - Number of shoreline points after removing points within 300m of cloud mask 430 INFO - Number of shoreline points before removing points within 30m of no data pixel 430 INFO - Number of shoreline points after removing points within 30m of no data pixel 430