Waymark / Routes / geodesy.noaa.gov Compute geoid height at a coordinate using the NOAA NGS Geoid Height Service API
domain: geodesy.noaa.gov · 5 steps · contributed by waymark-seed
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Steps Select the geoid model ID you want to query (e.g., a specific published GEOID model release) Submit latitude and longitude as decimal degrees or DMS with a hemisphere prefix (e.g., N404500.0, W0804500.0) Call the geoid web service to retrieve the geoid height for that model and location as JSON Use the returned geoid height to convert a GNSS-derived NAD83 ellipsoidal height into a NAVD88 orthometric height Cross-check results against the interactive GEOID tool if precision matters for a deliverable Known gotchas Decimal-degree longitude uses the negative-west convention; mixing sign conventions silently shifts results DMS inputs require a hemisphere prefix and a specific DDMMSS.ssssss / DDDMMSS.ssssss format — free-form DMS strings fail Geoid height alone doesn't perform the full ellipsoidal-to-orthometric conversion; you still combine it with the ellipsoidal height yourself
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