diff --git a/README.md b/README.md index 4be31ed8e28349b946e67cc1f256a29fb49831e6..5e902f41d7271055b5c03deba43be4aa52ba7326 100644 --- a/README.md +++ b/README.md @@ -19,7 +19,7 @@ task_categories: # NA-SAR NA-SAR is a North America synthetic aperture radar pretraining dataset built -from the NASA OPERA archive. It is intended for self-supervised and masked-image +from NASA OPERA products. It is intended for self-supervised and masked-image pretraining of SAR foundation models. This release is an unsplit pretraining corpus. There are no train/validation/test @@ -30,6 +30,7 @@ appropriate splits. ## Dataset Contents - Samples: 1,099,604 +- Shards: 91 WebDataset tar shards - Patch size: 128 x 128 pixels - RTC views: two spatial views per sample - Temporal RTC acquisitions: prime and secondary @@ -37,9 +38,8 @@ appropriate splits. - Incidence angle: one channel per spatial view - InSAR phase: stored as cos(phi), sin(phi) - Coherence: one channel per spatial view -- DEM elevation: one global-land normalized terrain channel per sample -- DEM relief: one patch-local robust elevation channel per sample -- DEM slope: one normalized slope-degree channel per sample +- DEM elevation: raw elevation in meters +- DEM slope: raw terrain slope in degrees Each tensor sample contains: @@ -55,14 +55,16 @@ Each tensor sample contains: | `coh_view_0` | `(1, 128, 128)` | Coherence for view 0 | | `ifg_view_1` | `(2, 128, 128)` | InSAR phase for view 1 as cos/sin | | `coh_view_1` | `(1, 128, 128)` | Coherence for view 1 | -| `dem` | `(1, 128, 128)` | Elevation normalized to the global-land robust range `[-100 m, 4000 m]` and clipped to `[0, 1]` | -| `dem_relief` | `(1, 128, 128)` | Patch-local robust elevation relief using the patch p5/p95 range, clipped to `[0, 1]` | -| `slope` | `(1, 128, 128)` | Terrain slope in degrees normalized by `[0 deg, 45 deg]` and clipped to `[0, 1]` | +| `dem` | `(1, 128, 128)` | Raw DEM elevation in meters | +| `slope_deg` | `(1, 128, 128)` | Raw terrain slope angle in degrees | + +`dem_relief` and normalized `slope` are not stored in the WebDataset. They are +derived at loading time from the raw `dem` and `slope_deg` arrays. ## Metadata -`metadata_hf.parquet` is the publishable metadata table for the sharded release. -It includes OPERA provenance, patch geometry, quality score, polarization +`metadata.parquet` is the publishable metadata table for the sharded release. It +includes OPERA provenance, patch geometry, quality score, polarization availability, and the following sharding columns: - `sample_key`: sample key inside the WebDataset shard @@ -72,8 +74,8 @@ availability, and the following sharding columns: The metadata is filtered to samples with `quality_score > 0.53`. -`webdataset_summary.json` records the shard count and marks this release with -`dem_extended: true`. +`webdataset_summary.json` records the shard count and DEM storage policy. For +this release, `dem_extended` is `"raw"` and `dem_arrays` is `["dem", "slope_deg"]`. ## Loading With Hugging Face Datasets @@ -99,19 +101,25 @@ print(arrays.files) ## Loading With PyTorch -The repository includes a lightweight PyTorch helper: +The release includes `nasar_dataset.py`, a lightweight PyTorch loader for the +local shard layout: ```python -from nasar_dataset import NASARRTCDataset, NASARInSARDataset +from nasar_dataset import NASARWebRTCDataset, NASARWebInSARDataset -rtc_ds = NASARRTCDataset("/path/to/NA-SAR") -insar_ds = NASARInSARDataset("/path/to/NA-SAR") +rtc_ds = NASARWebRTCDataset("/path/to/NA-SAR-HF") +insar_ds = NASARWebInSARDataset("/path/to/NA-SAR-HF", require_dem=True) ``` -For streaming at scale, use the WebDataset tar shards under `data/`. -Each tar member is a compressed `.npz` tensor file named `{sample_key}.npz`. -`NASARWebInSARDataset` returns a 6-channel InSAR view when collated as -`[cos(phi), sin(phi), coherence, dem, dem_relief, slope]`. +For InSAR, `NASARWebInSARDataset` returns SAR arrays plus DEM-derived channels: + +| Loader output key | Source array | Default normalization | +| --- | --- | --- | +| `dem_view_0/1` | `dem` | global elevation, `(-100 m, 4000 m) -> [0, 1]` | +| `dem_relief_view_0/1` | `dem` | patch-local p5/p95 relief -> `[0, 1]` | +| `slope_view_0/1` | `slope_deg` | slope degrees, `(0 deg, 45 deg) -> [0, 1]` | + +These normalization ranges can be changed through the loader constructor. ## Preprocessing Notes @@ -132,16 +140,17 @@ zero-padded after preprocessing. InSAR phase is stored as cosine and sine channels instead of wrapped phase radians to avoid phase discontinuities at the wrap boundary. -DEM channels are static for the spatial patch and are shared across both orbit -views. Elevation values are derived from aligned Copernicus DEM patches in -meters, then stored as normalized float32 arrays. The `dem` channel preserves an -absolute elevation signal using a fixed global-land range; `dem_relief` preserves -local terrain contrast; `slope` stores terrain steepness normalized from degrees. +DEM arrays are static for the spatial patch and shared across both orbit views. +`dem` is raw elevation in meters. `slope_deg` is raw terrain slope in degrees. +Derived terrain features, including global-normalized DEM, patch-local relief, +and normalized slope, are intentionally computed during loading rather than +stored as processed arrays. ## Source and Scope -The source data comes from OPERA SAR products over North America. Users should -follow the applicable terms and citation guidance for OPERA source products. +The source SAR data comes from NASA OPERA products over North America. Terrain +comes from aligned DEM patches. Users should follow the applicable terms and +citation guidance for OPERA and DEM source products. ## Intended Use @@ -156,3 +165,5 @@ self-supervised pretraining. It is not an evaluation benchmark by itself. - Missing RTC polarizations are represented by zero-padded channels. 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still clipping extremes. DEM_ELEVATION_NORM_STATS = (-100.0, 4000.0) DEM_SLOPE_DEG_NORM_STATS = (0.0, 45.0) +DEM_NODATA_VALUE = -9999.0 +DEM_RELIEF_PERCENTILES = (5.0, 95.0) DEMElevationNormStats = tuple[float, float] def _read_tif(path: str | Path) -> np.ndarray: @@ -129,11 +131,54 @@ def _read_dem_global_and_relief( return _center_crop(dem_global[np.newaxis]), _center_crop(dem_relief[np.newaxis]) +def _normalize_dem_global_and_relief_array( + arr: np.ndarray, + norm_stats: DEMElevationNormStats = DEM_ELEVATION_NORM_STATS, + nodata: float | None = DEM_NODATA_VALUE, + relief_percentiles: DEMElevationNormStats = DEM_RELIEF_PERCENTILES, +) -> tuple[np.ndarray, np.ndarray]: + """Normalize a raw DEM array into global elevation and local relief channels.""" + arr = np.squeeze(arr).astype(np.float32, copy=False) + valid = np.isfinite(arr) + if nodata is not None and np.isfinite(nodata): + valid &= arr != np.float32(nodata) + + p1, p99 = norm_stats + denom = max(float(p99) - float(p1), 1e-6) + dem_global = np.zeros_like(arr, dtype=np.float32) + dem_global[valid] = np.clip((arr[valid] - np.float32(p1)) / np.float32(denom), 0.0, 1.0) + + dem_relief = np.zeros_like(arr, dtype=np.float32) + values = arr[valid] + if values.size: + low, high = np.percentile(values, relief_percentiles) + relief_denom = max(float(high - low), 1e-6) + dem_relief[valid] = np.clip((arr[valid] - np.float32(low)) / np.float32(relief_denom), 0.0, 1.0) + return _center_crop(dem_global[np.newaxis]), _center_crop(dem_relief[np.newaxis]) + + def _read_slope(path: str | Path, norm_stats: DEMElevationNormStats = DEM_SLOPE_DEG_NORM_STATS) -> np.ndarray: """Read slope degrees as (1, 128, 128) float32, clipped/scaled to [0, 1].""" return _read_dem(path, norm_stats) +def _normalize_slope_array( + arr: np.ndarray, + norm_stats: DEMElevationNormStats = DEM_SLOPE_DEG_NORM_STATS, + nodata: float | None = DEM_NODATA_VALUE, +) -> np.ndarray: + """Normalize raw slope degrees to [0, 1].""" + arr = np.squeeze(arr).astype(np.float32, copy=False) + valid = np.isfinite(arr) + if nodata is not None and np.isfinite(nodata): + valid &= arr != np.float32(nodata) + p0, p1 = norm_stats + denom = max(float(p1) - float(p0), 1e-6) + out = np.zeros_like(arr, dtype=np.float32) + out[valid] = np.clip((arr[valid] - np.float32(p0)) / np.float32(denom), 0.0, 1.0) + return _center_crop(out[np.newaxis]) + + def _read_rtc_band(path: str | Path, log_scale: bool, alpha: float) -> np.ndarray: """Read one RTC band and return a (H, W) float32 array, optionally log-compressed.""" with rasterio.open(path) as src: @@ -332,7 +377,7 @@ def _load_insar_item( slope = np.zeros((1, 128, 128), dtype=np.float32) else: missing = [str(path) for path in (dem_path, slope_path) if not path.exists()] - raise FileNotFoundError(f"Missing DEM sidecar for {patch_id}: {missing}") + raise FileNotFoundError(f"Missing DEM files for {patch_id}: {missing}") # DEM is static per spatial patch, so both orbit views receive the same channel. item["dem_view_0"] = dem item["dem_view_1"] = dem.copy() @@ -504,12 +549,13 @@ class NASARInSARDataset(_NASARBase): min_quality_score: float | None = None, include_dem: bool = True, missing_dem: str = "error", + dem_norm_stats: DEMElevationNormStats = DEM_ELEVATION_NORM_STATS, ) -> None: super().__init__(nasar_root, parquet_path, years=years, min_quality_score=min_quality_score) if missing_dem not in {"error", "zeros"}: raise ValueError("missing_dem must be one of: error, zeros") self.dem_root = self.raw_root / DEFAULT_DEM_SUBDIR if include_dem else None - self.dem_norm_stats = DEM_ELEVATION_NORM_STATS + self.dem_norm_stats = dem_norm_stats self.missing_dem = missing_dem def __getitem__(self, idx: int) -> dict: @@ -677,7 +723,10 @@ class NASARWebInSARDataset(_NASARShardDataset): shuffle_shards: bool = True, shuffle_buffer: int = 2048, seed: int = 0, - require_dem: bool = True, + require_dem: bool = False, + dem_norm_stats: DEMElevationNormStats = DEM_ELEVATION_NORM_STATS, + dem_relief_percentiles: DEMElevationNormStats = DEM_RELIEF_PERCENTILES, + slope_norm_stats: DEMElevationNormStats = DEM_SLOPE_DEG_NORM_STATS, ) -> None: super().__init__( nasar_root=nasar_root, @@ -687,10 +736,19 @@ class NASARWebInSARDataset(_NASARShardDataset): seed=seed, ) self.require_dem = require_dem - - @staticmethod - def _decode_static_dem(key: str, z) -> dict[str, np.ndarray]: - if {"dem", "dem_relief", "slope"}.issubset(z.files): + self.dem_norm_stats = dem_norm_stats + self.dem_relief_percentiles = dem_relief_percentiles + self.slope_norm_stats = slope_norm_stats + + def _decode_static_dem(self, key: str, z) -> dict[str, np.ndarray]: + if {"dem", "slope_deg"}.issubset(z.files): + dem, dem_relief = _normalize_dem_global_and_relief_array( + z["dem"], + norm_stats=self.dem_norm_stats, + relief_percentiles=self.dem_relief_percentiles, + ) + slope = _normalize_slope_array(z["slope_deg"], norm_stats=self.slope_norm_stats) + elif {"dem", "dem_relief", "slope"}.issubset(z.files): dem = _copy_npz_array(z["dem"]) dem_relief = _copy_npz_array(z["dem_relief"]) slope = _copy_npz_array(z["slope"]) @@ -701,7 +759,8 @@ class NASARWebInSARDataset(_NASARShardDataset): else: raise KeyError( f"Sample {key} has no DEM arrays. Expected static keys " - "'dem', 'dem_relief', 'slope' in the extended NA-SAR WebDataset." + "'dem' and 'slope_deg' for raw DEM, or legacy processed " + "'dem', 'dem_relief', 'slope' arrays." ) return { "dem_view_0": dem, diff --git a/webdataset_summary.json b/webdataset_summary.json index d0345702eecf4933e1280841afa0f1508ce1171b..a70f093f4afbbae9875d05bffdf3fbbf88b89243 100644 --- a/webdataset_summary.json +++ b/webdataset_summary.json @@ -5,10 +5,14 @@ "shards": 91, "failures": 0, "target_shard_gb": 10.0, - "dem_extended": true, + "dem_extended": "raw", "dem_arrays": [ "dem", - "dem_relief", - "slope" - ] + "slope_deg" + ], + "dem_note": "dem is raw elevation in meters; slope_deg is raw slope angle in degrees. Derived DEM relief and normalized slope are computed by the dataloader.", + "raw_dem_repair": { + "shards": 91, + "samples": 1099604 + } }