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impact-comms-update
Browse fileschanges from the NASA-IMPACT O&C team
README.md
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@@ -63,11 +63,11 @@ Masks are a single band with values:
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## Data Splits
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The 3,854 chips have been randomly split into training (80%) and validation (20%)
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## Dataset Creation
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### Query and Scene Selection
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First, a set of 5,000 chips
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### Chip Generation
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In the final step, the three scenes for each chip
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## Data Splits
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The 3,854 chips have been randomly split into training (80%) and validation (20%) with corresponding ids recorded in cvs files `train_data.txt` and `validation_data.txt`.
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## Dataset Creation
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### Query and Scene Selection
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First, a set of 5,000 chips was defined based on samples from the USDA CDL to ensure a representative sampling across the CONUS. Next, for each chip, the corresponding HLS S30 scenes between March and September 2022 were queried, and scenes with low cloud cover were retrieved. Then, three scenes are selected among the low cloudy scenes to ensure a scene from early in the season, one in the middle, and one toward the end. The three final scenes were then reprojected to CDL's projection grid (`EPSG:5070`) using bilinear interpolation.
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### Chip Generation
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In the final step, the three scenes for each chip were clipped to the bounding box of the chip, and 18 spectral bands were stacked together. In addition, a quality control was applied to each chip using the `Fmask` layer of the HLS dataset. Any chip containing clouds, cloud shadow, adjacent to cloud or missing values was discarded. This resulted in 3,854 chips.
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