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 2025-06-13-22-20-00 cloud cover : 0.00% INFO - L8 2025-06-13-22-20-00: sand: 0.00% ,whitewater: 0.00% ,water: 0.40% INFO - L8 2025-06-13-22-20-00: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 ERROR - L8 2025-06-13-22-20-00: 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 2025-06-22-22-13-55: Skipped due to cloud cover 11.71% > threshold 10.00% INFO - L8 2025-06-22-22-14-19 cloud cover : 4.68% INFO - L8 2025-06-22-22-14-19: sand: 0.00% ,whitewater: 0.13% ,water: 50.33% INFO - L8 2025-06-22-22-14-19: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 4 shorelines. Number of shorelines after filtering shorelines: 2 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 322 INFO - Number of shoreline points after removing points within 300m of cloud mask 254 INFO - Number of shoreline points before removing points within 30m of no data pixel 254 INFO - Number of shoreline points after removing points within 30m of no data pixel 250 INFO - L8 2025-06-29-22-20-08 cloud cover : 0.00% INFO - L8 2025-06-29-22-20-08: sand: 0.00% ,whitewater: 0.00% ,water: 0.09% INFO - L8 2025-06-29-22-20-08: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 ERROR - L8 2025-06-29-22-20-08: 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 2025-07-15-22-20-13 cloud cover : 0.00% INFO - L8 2025-07-15-22-20-13: sand: 0.00% ,whitewater: 0.59% ,water: 1.63% INFO - L8 2025-07-15-22-20-13: 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 87 INFO - Number of shoreline points after removing points within 300m of cloud mask 87 INFO - Number of shoreline points before removing points within 30m of no data pixel 87 INFO - Number of shoreline points after removing points within 30m of no data pixel 84 INFO - Extracting shorelines for L9 Minimum Shoreline Length: 500 WARNING - L9 2025-06-14-22-13-47: Skipped due to cloud cover 29.18% > threshold 10.00% WARNING - L9 2025-06-14-22-14-10: Skipped due to cloud cover 53.08% > threshold 10.00% INFO - L9 2025-06-30-22-13-55 cloud cover : 0.00% INFO - L9 2025-06-30-22-13-55: sand: 0.00% ,whitewater: 0.18% ,water: 52.16% INFO - L9 2025-06-30-22-13-55: Less than 50 sand pixels detected within reference shoreline buffer. Using find_wl_contours1 INFO - Number of shorelines before removing shorelines < 500m: 17 shorelines. Number of shorelines after filtering shorelines: 1 shorelines INFO - Number of shoreline points before removing points within 300m of cloud mask 521 INFO - Number of shoreline points after removing points within 300m of cloud mask 521 INFO - Number of shoreline points before removing points within 30m of no data pixel 521 INFO - Number of shoreline points after removing points within 30m of no data pixel 520 INFO - L9 2025-06-30-22-14-19 cloud cover : 0.00% INFO - L9 2025-06-30-22-14-19: sand: 0.00% ,whitewater: 0.22% ,water: 51.49% INFO - L9 2025-06-30-22-14-19: 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 226 INFO - Number of shoreline points after removing points within 300m of cloud mask 226 INFO - Number of shoreline points before removing points within 30m of no data pixel 226 INFO - Number of shoreline points after removing points within 30m of no data pixel 223 WARNING - L9 2025-07-16-22-14-00: Skipped due to cloud cover 14.79% > threshold 10.00% INFO - L9 2025-07-16-22-14-24 cloud cover : 0.00% INFO - L9 2025-07-16-22-14-24: sand: 0.00% ,whitewater: 1.82% ,water: 50.62% INFO - L9 2025-07-16-22-14-24: 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 253 INFO - Number of shoreline points after removing points within 300m of cloud mask 253 INFO - Number of shoreline points before removing points within 30m of no data pixel 253 INFO - Number of shoreline points after removing points within 30m of no data pixel 249