Retrieve a predicted gravity value at a project location from NGS GRAV-D survey data for high-precision geoid/height work

domain: geodesy.noaa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

  1. Confirm the project site falls within GRAV-D survey coverage via the GRAV-D data products page (geodesy.noaa.gov/GRAV-D/data_products.shtml)
  2. Call the Gravity Predictor endpoint following the same lat/lon parameter pattern documented for NGS's other web services (geodesy.noaa.gov/web_services/grav-d.shtml)
  3. Supply an ellipsoid height along with lat/lon, since the predicted gravity value depends on elevation as well as horizontal position
  4. Parse the returned predicted gravity value and feed it into downstream geoid modeling or gravimetric leveling corrections
  5. Fetch the service's metadata endpoint (pattern geodesy.noaa.gov/api/<service>/meta) to confirm exact current parameter names before scripting

Known gotchas

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