usgs-ned

usgs-ned

Library for use with the The National Map - Elevation Point Query Service of the USGS (formerly known as NED).

The Elevation Point Query Service returns the elevation in international feet or meters for a specific latitude/longitude (NAD 1983) point from the USGS Elevation Service hosted at the NGTOC. Input parameters: x (longitude), y (latitude), units (Feet, Meters), output (XML, JSON). Latitude and longitude must be specified in decimal degrees with southern latitudes and western longitudes represented as negative values.

Installation

Use a package manager (e.g., NPM or Yarn) to install the package named usgs-ned.

npm install usgs-ned

Use

import { getElevationData, MeasurementUnits, WKId } from "usgs-ned";

// Call the webs service.

const elevationData = await getElevationData({
  x: -122.57539940320193,
  y: 47.258260494342196,
  units: MeasurementUnits.Feet,
  wkid: WKId.gps,
  includeDate: true,
});

// The expected result should be similar to this.

const expectedResult = {
  location: {
    x: -122.57539940320193,
    y: 47.258260494342196,
    spatialReference: {
      wkid: 4326,
      latestWkid: 4326,
    },
  },
  locationId: 0,
  value: 13.34829010234212,
  rasterId: 42167,
  resolution: 1,
  attributes: {
    AcquisitionDate: new Date(2020, 2, 1)
  },
};