Installation

    npm install
    grunt

(Tests will fail after a fresh checkout, because tile e008/n53.dt0 must be added to 'examples'-folder.)

Usage of Terrain

const path = require('path'); const dted = require(path.join(__dirname, 'index.js'));

const fetcher = new dted.FileSystemTileFetcher('./dted'); const terrain = new dted.Terrain(fetcher);

async function run(lat, lon) { const tile = await terrain.fetchTileAt(lat, lon) console.log(Altitude: ${tile.getAltitudeAt(lat, lon)} m ${(tile.getAltitudeAt(lat, lon) * 3.2808).toFixed(2)} ft);

const alt = await terrain.getAltitudeAt(lat, lon)
console.log(`Altitude: ${alt} m ${(alt * 3.2808).toFixed(2)} ft`);

}

run(45.689300, -118.848903)

Usage of Tile

var dted = require('lethexa-dted');

var buffer = ...dted-data...
var tile = dted.Tile( buffer );

// Iterate all altitude-values and their position
tile.forEachPosition( function(lat, lon, alt) {
	console.log('Position: ', lat, lon, alt);
});

// Find the next altitude-value
var alt = tile.getAltitudeAt(lat, lon);