Building-level ground subsidence from InSAR (vertical velocity and differential settlement)

Kilde

Approach model over NGU InSAR Norway (Sentinel-1) and building footprints

Geografi

Adressepunktet

Regnes som foreldet etter

120 døgn

Tilgang

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models

Tilgjengelig med: kjøpt kvote eller avtalt plan (alle felt) · Priser

Hva dette ikke sier

Gjengitt ordrett fra seksjonens warnings-felt, slik API-et returnerer det. Vi oversetter dem ikke: en oversettelse ville vist noe annet enn det svaret ditt faktisk inneholder.

• Estimate, not a survey or a geotechnical assessment: velocities of radar reflectors (roofs, walls, ground) within the building footprint plus 20 m, as a trend over the InSAR measurement period (measurement_from to measurement_to), relative to NGU's local reference per processing tile. It does not say the building is damaged or will be.
• Method insar-building-v1. vertical_mm_per_year is the median per-point vertical velocity, negative = moving down. With geometry_mode asc_desc the ascending and descending tracks are combined into east and vertical velocity (north neglected); with los_only each point's line-of-sight velocity is divided by its upward component, which assumes purely vertical movement and is wrong where the ground moves sideways or down a slope. settlement_p90_mm_per_year is the 90th percentile of settlement (positive = going down). differential_mm_per_year_per_10m is the tilt of a robust (Tukey biweight) plane fitted to the points, per 10 m: uneven settlement, the part that cracks foundations.
• Fewer than 5 usable points (los_up at least 0.3, coherence at least 0.5) leaves every figure and the class null; points_used says how many were found. Roof and ground reflectors are mixed, so a roof that moves with temperature or a settling terrace can dominate a small sample. No record means the kommune's InSAR points are not loaded or the pipeline has not reached it; absence is not stability.
• subsidence_class: attention when settlement is at least 5 mm/yr, settlement_p90 at least 8 mm/yr or differential at least 1.0 mm/yr per 10 m; stable when settlement is under 2 mm/yr and differential under 0.5 mm/yr per 10 m (about the noise level of the product); slow otherwise. These are Approach screening thresholds, not a standard.
• Footprints: footprint_source names the outline used. 'osm' is an OpenStreetMap outline matched to the Matrikkel building number (ODbL, © OpenStreetMap contributors); 'address_point' means no outline was held and a 20 m disc around the address point was used. FKB building outlines are not used.
• Licence: NLOD 2.0 (Norwegian Licence for Open Government Data), stated by NGU on https://insar.ngu.no/. The service contains modified Copernicus Sentinel data. Attribution: Geological Survey of Norway (NGU), InSAR Norway, with NORCE, NVE and the Norwegian Space Agency.
• validation lists each figure the model is checked by, against the reference named in it. value null with status not_yet_computed means the check has not been run on the data yet; it is not a pass.

Felter

5 av 18 felter er verdifelter — de som avgjør om en post faktisk sier noe. Resten er kontekst: identifikatorer, koder og tidsstempler.

Hent denne seksjonen

Send nøkkelen i X-API-Key-headeren. Seksjonen kan hentes med resten av adressen, eller alene med paginering.

curl --fail-with-body --silent --show-error \
  -H "X-API-Key: $APPROACH_API_KEY" \
  'https://api.approach.no/api/v1/addresses/285717643?include=ground_subsidence'

# paginert, én seksjon om gangen
curl --fail-with-body --silent --show-error \
  -H "X-API-Key: $APPROACH_API_KEY" \
  'https://api.approach.no/api/v1/addresses/285717643/sections/ground_subsidence?limit=25'

Hvorfor den ikke kan prøves her

Seksjonen er ikke en del av den offentlige demoprojeksjonen. Det er en lisens- og personvernavgjørelse, ikke et tegn på at dataene mangler: de serveres til kunder med tilgang til seksjonen.