| # Serving Notes |
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| FireWx-FM predicts 12-hour active-fire occupancy on a native 5 km grid. This page records the serving choices needed for full-map inference. |
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| ## Use The Fixed Channel Contract |
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| The model consumes a 16-channel tensor in `[channel, y, x]` order. The channel list and units are defined in: |
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| ```text |
| models/metadata/input_channels.json |
| docs/inference_contract.md |
| ``` |
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| Two details are especially important: |
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| - The CAPE channel is NOAA HRRR CAPE for the 0-3000 m above-ground layer. |
| - Continuous channels are z-score normalized with `models/metadata/input_normalization_stats.json`. |
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| ## Apply The No-Exposure Serving Contract |
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| The released checkpoint is served with channels `14` and `15` zeroed after normalization: |
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| - `14`: housing density. |
| - `15`: population. |
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| The output should therefore be interpreted as active-fire occupancy probability under the released no-exposure serving contract. |
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| ## Use Overlap-Window Inference |
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| Training uses 32 by 32 crops to sample sparse active-fire labels. That crop size is not the full-map serving tile size. For CONUS-scale inference, use the default serving settings: |
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| | Setting | Value | |
| |---|---:| |
| | Window | `256` | |
| | Stride | `64` | |
| | Halo crop | `32` | |
| | Phase shifts | `0,4,8,12` along y and x | |
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| The phase ensemble evaluates shifted versions of the same input and averages the shifted-back probability maps. This reduces dependence on tile origin and produces a smoother full-domain probability field. |
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| ## Preserve Validity Masks |
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| The validity masks are numeric input features: |
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| - `dynamic_valid`: dynamic weather-input validity after cache construction. |
| - `static_valid`: fraction of static layers valid after reprojection. |
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| They are not output masks. They should be supplied with the physical channels so sanitized missing values are not confused with true zeros. |
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