Satellite-measured ground motion near the address (InSAR Norge)
ground_motion13 fieldsNot in the demo
Available with: bought bundle or agreed plan (all fields) · Pricing
What this does not say
Quoted verbatim from the section’s warnings field, exactly as the API returns it. They are not translated: a translation would show something other than what your response actually contains.
- One row summarising every InSAR persistent scatterer within 100 m of the address point, from all ascending and descending Sentinel-1 tracks that see it (dataset_count). min_los_velocity_mm_yr is the strongest movement away from the satellite and max_los_velocity_mm_yr the strongest toward it, in mm per year along the line of sight. measurement_from and measurement_to are the first and last radar acquisition of the dataset; a single point can lack some of them.
- Loaded kommune by kommune from NGU's query API (there is no national file to download), so the section has records only where a load has been run: GET /coverage, source ground_motion, lists the kommuner loaded and the date each one was completed. An address in a kommune that is not listed gets no record, and that says nothing about its ground.
- InSAR measures how far a radar reflector (a roof edge, a wall, a mast, a rock) moves toward or away from a satellite along its line of sight. It is not a survey of the building or the plot and it does not say the building moves; a reflector can move on its own.
- Velocities are relative to a local reference per ~5 x 5 km processing tile (NGU adjusts each tile so the peak of the velocity histogram is 0 mm/year): they show local differences, not absolute ground movement. Negative is away from the satellite. The vertical-equivalent figures divide the line-of-sight velocity by its upward component and so assume purely vertical movement; east-west or slope movement makes them wrong. Dense vegetation, farmland, snow and fast-moving ground give no points or false values.
- No scatterer within 100 m means the radar saw no stable reflector there (vegetation, water, shadow, a newly built house) or the area is not loaded yet (GET /coverage, source ground_motion). Absence is not stability.
- 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.
Fields
7 of 13 fields are value fields — the ones that decide whether a record actually says anything. The rest are context: identifiers, codes and timestamps.
| Field | Type | Role |
|---|---|---|
| scatterer_count_100m | integer | null | value |
| scatterer_count_50m | integer | null | context |
| nearest_distance_m | integer | null (m) | value |
| dataset_count | integer | null | context |
| median_los_velocity_mm_yr | number | null | value |
| min_los_velocity_mm_yr | number | null | value |
| max_los_velocity_mm_yr | number | null | value |
| median_vertical_equivalent_mm_yr | number | null | value |
| most_negative_vertical_equivalent_mm_yr | number | null | value |
| measurement_from | date | null | context |
| measurement_to | date | null | context |
| release | string | null | context |
| updated_at | timestamp | null | context |
Fetch this section
Send the key in the X-API-Key header. The section can be fetched with the rest of the address, or on its own with pagination.
curl --fail-with-body --silent --show-error \ -H "X-API-Key: $APPROACH_API_KEY" \ 'https://api.approach.no/api/v1/addresses/285717643?include=ground_motion' # paginated, one section at a time curl --fail-with-body --silent --show-error \ -H "X-API-Key: $APPROACH_API_KEY" \ 'https://api.approach.no/api/v1/addresses/285717643/sections/ground_motion?limit=25'
Why it cannot be tried here
This section is not part of the public demo projection. That is a licensing and privacy decision, not a sign the data is missing: it is served to customers granted the section.