{
 "title": "CityTwin worked model of Brasov, Romania: the values behind the four figures on cortexprime.world",
 "published": "2026-10-07",
 "what_this_is": "Per-neighbourhood values extracted, unchanged, from the Brasov city model of CityTwin (model generated 2026-08-02). The public demonstration export of the model is a reduced one and does not carry the sealing layer or the surface temperature layer, so the values are published here.",
 "territory": {
  "units": "15 neighbourhoods of Brasov that have a mapped boundary",
  "boundaries": "OpenStreetMap contributors, Open Database Licence",
  "note": "The sums cover these 15 polygons, not the whole administrative territory of the municipality. It is not an official municipal dataset."
 },
 "figures": {
  "neighbourhoods": {
   "value": 15,
   "how_to_check": "count the rows below"
  },
  "impervious_surface_historic_centre_2021": {
   "value": 73.7,
   "unit": "per cent of area",
   "neighbourhood": "Centrul istoric (Cetatea)",
   "how_to_check": "column impervious_pct_2021, highest of the 15"
  },
  "surface_temperature_spread": {
   "value": 11.1,
   "unit": "degrees Celsius",
   "warmest": {
    "neighbourhood": "Scriitorilor",
    "mean_c": 46.3
   },
   "coolest": {
    "neighbourhood": "Prund-Schei",
    "mean_c": 35.2
   },
   "how_to_check": "largest minus smallest value of column surface_temp_mean_c"
  },
  "newly_sealed_2018_2021": {
   "value": 65.3,
   "unit": "hectares",
   "sum_newly_sealed_ha": 65.26,
   "sum_unsealed_ha": 0.0,
   "sum_net_change_ha": 65.26,
   "how_to_check": "sum of column ha_newly_sealed, rounded to one decimal. Newly sealed and net change are equal here only because no area was unsealed in the period; they are different quantities."
  }
 },
 "sources": [
  {
   "used_for": "ha_newly_sealed, ha_unsealed, ha_net_change",
   "product": "Copernicus Land Monitoring Service, High Resolution Layer Imperviousness Density Change 2018-2021 (IMDC)",
   "resolution": "20 m",
   "period": "2018 to 2021",
   "retrieved": "2026-08-02",
   "service": "public WMS of the producer, layer HRL_NVLCC_IMDC_20m",
   "url": "https://land.copernicus.eu/en/products/high-resolution-layer-imperviousness",
   "method": "Pixel values 0 to 200 are the change in imperviousness density in percentage points with an offset of 100; 201 is unchanged non-impervious land; 255 is outside coverage and excluded. One 20 m pixel is 400 square metres, measured in EPSG:3035. Hectares are the sum of the percentage points over the pixels inside the polygon, divided by 100, times 0.04. Increases and decreases are summed separately. It is the Copernicus change product, not a subtraction of two yearly layers."
  },
  {
   "used_for": "impervious_pct_2021, impervious_pct_2018",
   "product": "Copernicus Land Monitoring Service, High Resolution Layer Imperviousness Density, reference years 2021 and 2018",
   "resolution": "10 m",
   "retrieved": "2026-08-02 (2021), 2026-08-01 (2018)",
   "url": "https://land.copernicus.eu/en/products/high-resolution-layer-imperviousness/imperviousness-density-2021",
   "method": "Mean of the pixel values, 0 to 100 per cent each, over the pixels inside the polygon, in EPSG:3035. Pixels without data are excluded."
  },
  {
   "used_for": "surface_temp_mean_c, surface_temp_vs_city_mean_c",
   "product": "Landsat 9, Collection 2 Level-2, Surface Temperature band, USGS and NASA",
   "resolution": "30 m",
   "acquired": "2026-06-29, 09:02 UTC, 4.5 per cent cloud over the scene",
   "retrieved": "2026-08-02",
   "method": "Official USGS scaling. Mean over the clear pixels inside the polygon; cloud, cloud shadow, cirrus, snow and water are removed with the QA_PIXEL band. City mean on the same pass: 40.5 degrees Celsius."
  }
 ],
 "limits": [
  "Sealing is measured only inside the 15 neighbourhood polygons. The latest Copernicus reference year is 2021, so later change is not included.",
  "Surface temperature is the temperature of the surface (asphalt, roofs, grass) on one late-morning satellite pass. It is not air temperature and not a summer average.",
  "Imperviousness describes land cover in the reference year. It is not a simulation of temperature."
 ],
 "attribution": "Contains modified Copernicus Land Monitoring Service information (2018-2021). Landsat data courtesy of the U.S. Geological Survey. Neighbourhood boundaries (c) OpenStreetMap contributors.",
 "rows": [
  {
   "neighbourhood": "Tractorul",
   "ha_newly_sealed": 21.96,
   "ha_unsealed": 0.0,
   "ha_net_change": 21.96,
   "mean_change_percentage_points": 2.34,
   "change_pixels_20m": 23469,
   "impervious_pct_2021": 37.9,
   "impervious_pct_2018": 35.2,
   "impervious_pixels_10m": 93895,
   "surface_temp_mean_c": 42.9,
   "surface_temp_vs_city_mean_c": 2.5,
   "surface_temp_clear_pixels_30m": 10434
  },
  {
   "neighbourhood": "Bartolomeu Nord",
   "ha_newly_sealed": 12.61,
   "ha_unsealed": 0.0,
   "ha_net_change": 12.61,
   "mean_change_percentage_points": 1.13,
   "change_pixels_20m": 27880,
   "impervious_pct_2021": 23.0,
   "impervious_pct_2018": 22.0,
   "impervious_pixels_10m": 111531,
   "surface_temp_mean_c": 41.0,
   "surface_temp_vs_city_mean_c": 0.5,
   "surface_temp_clear_pixels_30m": 12385
  },
  {
   "neighbourhood": "Stupini",
   "ha_newly_sealed": 9.68,
   "ha_unsealed": 0.0,
   "ha_net_change": 9.68,
   "mean_change_percentage_points": 0.34,
   "change_pixels_20m": 71294,
   "impervious_pct_2021": 6.1,
   "impervious_pct_2018": 5.3,
   "impervious_pixels_10m": 285186,
   "surface_temp_mean_c": 38.0,
   "surface_temp_vs_city_mean_c": -2.4,
   "surface_temp_clear_pixels_30m": 31662
  },
  {
   "neighbourhood": "Bartolomeu",
   "ha_newly_sealed": 6.74,
   "ha_unsealed": 0.0,
   "ha_net_change": 6.74,
   "mean_change_percentage_points": 0.5,
   "change_pixels_20m": 33418,
   "impervious_pct_2021": 21.2,
   "impervious_pct_2018": 21.2,
   "impervious_pixels_10m": 133679,
   "surface_temp_mean_c": 40.0,
   "surface_temp_vs_city_mean_c": -0.5,
   "surface_temp_clear_pixels_30m": 14854
  },
  {
   "neighbourhood": "Astra",
   "ha_newly_sealed": 6.58,
   "ha_unsealed": 0.0,
   "ha_net_change": 6.58,
   "mean_change_percentage_points": 1.64,
   "change_pixels_20m": 10003,
   "impervious_pct_2021": 59.4,
   "impervious_pct_2018": 55.1,
   "impervious_pixels_10m": 40048,
   "surface_temp_mean_c": 45.8,
   "surface_temp_vs_city_mean_c": 5.3,
   "surface_temp_clear_pixels_30m": 4442
  },
  {
   "neighbourhood": "Triaj-Hărman",
   "ha_newly_sealed": 2.55,
   "ha_unsealed": 0.0,
   "ha_net_change": 2.55,
   "mean_change_percentage_points": 0.47,
   "change_pixels_20m": 13428,
   "impervious_pct_2021": 19.5,
   "impervious_pct_2018": 21.3,
   "impervious_pixels_10m": 53688,
   "surface_temp_mean_c": 41.3,
   "surface_temp_vs_city_mean_c": 0.9,
   "surface_temp_clear_pixels_30m": 5966
  },
  {
   "neighbourhood": "Noua-Dârste",
   "ha_newly_sealed": 2.28,
   "ha_unsealed": 0.0,
   "ha_net_change": 2.28,
   "mean_change_percentage_points": 0.51,
   "change_pixels_20m": 11093,
   "impervious_pct_2021": 39.1,
   "impervious_pct_2018": 38.9,
   "impervious_pixels_10m": 44396,
   "surface_temp_mean_c": 41.3,
   "surface_temp_vs_city_mean_c": 0.9,
   "surface_temp_clear_pixels_30m": 4932
  },
  {
   "neighbourhood": "Prund-Schei",
   "ha_newly_sealed": 1.26,
   "ha_unsealed": 0.0,
   "ha_net_change": 1.26,
   "mean_change_percentage_points": 0.25,
   "change_pixels_20m": 12693,
   "impervious_pct_2021": 15.8,
   "impervious_pct_2018": 14.1,
   "impervious_pixels_10m": 50803,
   "surface_temp_mean_c": 35.2,
   "surface_temp_vs_city_mean_c": -5.2,
   "surface_temp_clear_pixels_30m": 5645
  },
  {
   "neighbourhood": "Centrul Nou",
   "ha_newly_sealed": 0.79,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.79,
   "mean_change_percentage_points": 0.17,
   "change_pixels_20m": 11307,
   "impervious_pct_2021": 57.0,
   "impervious_pct_2018": 54.4,
   "impervious_pixels_10m": 45193,
   "surface_temp_mean_c": 44.9,
   "surface_temp_vs_city_mean_c": 4.5,
   "surface_temp_clear_pixels_30m": 5018
  },
  {
   "neighbourhood": "Est-Zizin",
   "ha_newly_sealed": 0.42,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.42,
   "mean_change_percentage_points": 0.09,
   "change_pixels_20m": 11751,
   "impervious_pct_2021": 24.3,
   "impervious_pct_2018": 25.9,
   "impervious_pixels_10m": 46978,
   "surface_temp_mean_c": 42.0,
   "surface_temp_vs_city_mean_c": 1.5,
   "surface_temp_clear_pixels_30m": 5225
  },
  {
   "neighbourhood": "Brașovechi",
   "ha_newly_sealed": 0.36,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.36,
   "mean_change_percentage_points": 0.22,
   "change_pixels_20m": 4139,
   "impervious_pct_2021": 55.0,
   "impervious_pct_2018": 53.7,
   "impervious_pixels_10m": 16563,
   "surface_temp_mean_c": 44.5,
   "surface_temp_vs_city_mean_c": 4.0,
   "surface_temp_clear_pixels_30m": 1840
  },
  {
   "neighbourhood": "Centrul istoric (Cetatea)",
   "ha_newly_sealed": 0.03,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.03,
   "mean_change_percentage_points": 0.05,
   "change_pixels_20m": 1591,
   "impervious_pct_2021": 73.7,
   "impervious_pct_2018": 72.4,
   "impervious_pixels_10m": 6332,
   "surface_temp_mean_c": 44.4,
   "surface_temp_vs_city_mean_c": 3.9,
   "surface_temp_clear_pixels_30m": 704
  },
  {
   "neighbourhood": "Florilor-Craiter",
   "ha_newly_sealed": 0.0,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.0,
   "mean_change_percentage_points": 0.0,
   "change_pixels_20m": 2922,
   "impervious_pct_2021": 60.5,
   "impervious_pct_2018": 57.4,
   "impervious_pixels_10m": 11701,
   "surface_temp_mean_c": 45.6,
   "surface_temp_vs_city_mean_c": 5.2,
   "surface_temp_clear_pixels_30m": 1300
  },
  {
   "neighbourhood": "Valea Cetății",
   "ha_newly_sealed": 0.0,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.0,
   "mean_change_percentage_points": 0.0,
   "change_pixels_20m": 4323,
   "impervious_pct_2021": 33.1,
   "impervious_pct_2018": 32.5,
   "impervious_pixels_10m": 17249,
   "surface_temp_mean_c": 38.8,
   "surface_temp_vs_city_mean_c": -1.6,
   "surface_temp_clear_pixels_30m": 1915
  },
  {
   "neighbourhood": "Scriitorilor",
   "ha_newly_sealed": 0.0,
   "ha_unsealed": 0.0,
   "ha_net_change": 0.0,
   "mean_change_percentage_points": 0.0,
   "change_pixels_20m": 1223,
   "impervious_pct_2021": 46.1,
   "impervious_pct_2018": 51.9,
   "impervious_pixels_10m": 4875,
   "surface_temp_mean_c": 46.3,
   "surface_temp_vs_city_mean_c": 5.9,
   "surface_temp_clear_pixels_30m": 541
  }
 ]
}