Analyze Ground Zero landforms

2026-05-14 06:02:14 -07:00
parent fcb3d18b0c
commit 2344a11519
4 changed files with 406 additions and 2 deletions
@@ -0,0 +1,189 @@
+{
+  "schema_version": 1,
+  "tile_id": "gz_us_ca_pacifica_utm10n_e544_n4160",
+  "generated_at_utc": "2026-05-14T13:01:54Z",
+  "source_dem": "Data/Terrain/Extracted/gz_us_ca_pacifica_utm10n_e544_n4160/gz_us_ca_pacifica_utm10n_e544_n4160_1m_dem_subset.tif",
+  "source_pixel_size_m": 1.0,
+  "elevation_summary_m": {
+    "sample_count": 1000000,
+    "min": 3.1603012084960938,
+    "max": 96.50570678710938,
+    "mean": 18.240529416484833,
+    "p05": 4.8725638628005985,
+    "p50": 12.865000247955322,
+    "p95": 54.56564807891842
+  },
+  "slope_summary_degrees": {
+    "sample_count": 1000000,
+    "min": 0.0,
+    "max": 53.6228621974196,
+    "mean": 6.626558917878934,
+    "p05": 0.5370162403201985,
+    "p50": 2.775685181729069,
+    "p95": 26.946500130585825
+  },
+  "elevation_bands": {
+    "low_coastal_floor_0_to_5m": {
+      "samples": 57812,
+      "percent": 5.7812
+    },
+    "valley_floor_5_to_15m": {
+      "samples": 549481,
+      "percent": 54.9481
+    },
+    "lower_slope_15_to_30m": {
+      "samples": 248794,
+      "percent": 24.8794
+    },
+    "hillside_30_to_60m": {
+      "samples": 106117,
+      "percent": 10.6117
+    },
+    "upper_hillside_over_60m": {
+      "samples": 37796,
+      "percent": 3.7796000000000003
+    }
+  },
+  "slope_classes": {
+    "flat_0_to_3deg": {
+      "samples": 529571,
+      "percent": 52.957100000000004
+    },
+    "gentle_3_to_8deg": {
+      "samples": 239380,
+      "percent": 23.938000000000002
+    },
+    "moderate_8_to_15deg": {
+      "samples": 65264,
+      "percent": 6.526400000000001
+    },
+    "steep_15_to_30deg": {
+      "samples": 133015,
+      "percent": 13.301499999999999
+    },
+    "very_steep_over_30deg": {
+      "samples": 32770,
+      "percent": 3.277
+    }
+  },
+  "edge_summary": {
+    "north": {
+      "elevation_m": {
+        "sample_count": 10000,
+        "min": 3.1603012084960938,
+        "max": 37.224822998046875,
+        "mean": 19.415938945102692,
+        "p05": 3.7356777787208557,
+        "p50": 25.907390594482422,
+        "p95": 36.860646438598636
+      },
+      "slope_degrees": {
+        "sample_count": 10000,
+        "min": 0.037091884064298766,
+        "max": 45.285121559904184,
+        "mean": 6.473992755423365,
+        "p05": 0.5858426034174887,
+        "p50": 2.6639185518040582,
+        "p95": 30.777157684677253
+      }
+    },
+    "south": {
+      "elevation_m": {
+        "sample_count": 10000,
+        "min": 11.210755348205566,
+        "max": 57.378944396972656,
+        "mean": 19.908063950920106,
+        "p05": 13.963506507873536,
+        "p50": 16.776620864868164,
+        "p95": 43.284688186645496
+      },
+      "slope_degrees": {
+        "sample_count": 10000,
+        "min": 0.02587516366275778,
+        "max": 41.32678432094451,
+        "mean": 5.082426422396511,
+        "p05": 0.36230046773522456,
+        "p50": 2.080124788542048,
+        "p95": 19.327406558284327
+      }
+    },
+    "west": {
+      "elevation_m": {
+        "sample_count": 10000,
+        "min": 3.5281026363372803,
+        "max": 59.69044876098633,
+        "mean": 15.149734993314743,
+        "p05": 3.819321799278259,
+        "p50": 7.0536699295043945,
+        "p95": 55.92644710540772
+      },
+      "slope_degrees": {
+        "sample_count": 10000,
+        "min": 0.01054528995018575,
+        "max": 36.558433388910196,
+        "mean": 7.016524762500618,
+        "p05": 0.5189932134703178,
+        "p50": 2.9155252336441477,
+        "p95": 25.969294198530317
+      }
+    },
+    "east": {
+      "elevation_m": {
+        "sample_count": 10000,
+        "min": 24.61846351623535,
+        "max": 96.50570678710938,
+        "mean": 59.40558109054565,
+        "p05": 25.120229148864745,
+        "p50": 62.73081398010254,
+        "p95": 91.4665027618408
+      },
+      "slope_degrees": {
+        "sample_count": 10000,
+        "min": 0.02531559488807776,
+        "max": 41.51481793089258,
+        "mean": 16.207012238657054,
+        "p05": 1.0952053252236598,
+        "p50": 18.041312205728605,
+        "p95": 33.03249604124476
+      }
+    }
+  },
+  "landform_classification": {
+    "contains_mountains": false,
+    "contains_hills": true,
+    "contains_steep_slopes": true,
+    "contains_river": false,
+    "contains_stream": false,
+    "contains_stream_candidate_from_dem": true,
+    "contains_lake": false,
+    "contains_coastline": false,
+    "coastline_absence_confirmed_by_water_pass": true
+  },
+  "gameplay_masks": {
+    "walkable_or_buildable_first_pass": {
+      "samples": 834215,
+      "percent": 83.42150000000001
+    },
+    "difficult_or_slow_travel_first_pass": {
+      "samples": 165785,
+      "percent": 16.5785
+    },
+    "possible_drainage_or_freshwater_search_zone": {
+      "samples": 172990,
+      "percent": 17.299
+    }
+  },
+  "handling_decisions": {
+    "hills": "Present. Use slope/elevation classes for movement modifiers, resource placement, and visual foliage density.",
+    "mountains": "Not present in this 1 km MVP tile. Defer mountain rules to higher-elevation future tiles.",
+    "river": "Not confirmed from current DEM-only pass. Require NHD or equivalent hydrography before placing real river geometry.",
+    "stream": "DEM suggests low drainage/search zones, but stream presence is not confirmed. Use these zones as candidates for later NHD validation and MVP freshwater placement.",
+    "lake": "Not present in current tile.",
+    "coastline": "Absent inside the current tile. Coastline and bathymetry remain neighbor-tile work."
+  },
+  "notes": [
+    "This is a DEM-only first pass and intentionally does not invent rivers, lakes, or coastline.",
+    "Use confirmed hydrography before committing permanent watercourse geometry.",
+    "The tile has enough hills and slope variation to support movement-cost and resource-placement rules."
+  ]
+}