{ "schema_version": "1.0.0", "source": { "title": "SRTM-derived N28E085 native HGT posts (Mapzen Skadi)", "url": "https://s3.amazonaws.com/elevation-tiles-prod/skadi/N28/N28E085.hgt.gz", "official_dataset_url": "https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-shuttle-radar-topography-mission-srtm-1", "format_documentation_url": "https://github.com/tilezen/joerd/blob/master/docs/formats.md#skadi", "retrieved_at": "2026-08-30", "gzip_sha256": "0430900f931bfbd53b5f2cd84ecfc4b23150df5ede14120d28368a63025c0120", "hgt_sha256": "dd37e0c91794b8e663acfc1aa8a17b09c5bc43436b9ae6feef5288ad8ea17af2", "source_rows": 3601, "source_columns": 3601, "horizontal_datum": "WGS84", "vertical_datum": "EGM96", "source_resolution_arc_seconds": 1, "resampling": "None: integer elevation posts copied directly from the source HGT" }, "grid_file": "elevation-grid.json", "grid_sha256": "ed666015c0e63d97c2e150aab3dfb5c7d861d5ec07969486244e0f9f6c63a51b", "buffer_m": 400, "extent": { "min_x_m": -540, "max_x_m": 550, "min_y_m": -480, "max_y_m": 490 }, "width_m": 1090, "depth_m": 970, "native_post_count": 1702, "interpolation": "Bilinear interpolation of four native one-arc-second HGT posts, retaining each post and weight below", "caution": "Actual DEM surface samples at approximate geographic locations. Plan bearing, portal location and engineering-to-EGM96 datum tie are unverified. These are not tunnel invert levels, surveyed benchmarks or rock-cover measurements. SRTM dates to 2000.", "points": [ { "id": "Main_Access_Tunnel:1", "label": "Main Access Tunnel · point 1", "kind": "tunnel-plan-vertex", "component": "Main_Access_Tunnel", "plan_xy_m": [ 140, 15 ], "latitude": 28.1576014, "longitude": 85.3318422, "ground_elevation_m": 1410.095636076962, "source_posts": [ { "hgt_row": 3032, "hgt_column": 1194, "crop_row": 17, "crop_column": 27, "elevation_m": 1420, "weight": 0.13436392320785193 }, { "hgt_row": 3032, "hgt_column": 1195, "crop_row": 17, "crop_column": 28, "elevation_m": 1413, "weight": 0.23067607678983928 }, { "hgt_row": 3033, "hgt_column": 1194, "crop_row": 18, "crop_column": 27, "elevation_m": 1412, "weight": 0.23371607681598586 }, { "hgt_row": 3033, "hgt_column": 1195, "crop_row": 18, "crop_column": 28, "elevation_m": 1404, "weight": 0.4012439231863229 } ] }, { "id": "Main_Access_Tunnel:2", "label": "Main Access Tunnel · point 2", "kind": "tunnel-plan-vertex", "component": "Main_Access_Tunnel", "plan_xy_m": [ 55, 15 ], "latitude": 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