Class ElevationSampler
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Échantillonneur Elevation
Permet d'échantillonner les altitudes à des endroits spécifiques.
L'exemple ci-dessous montre comment utiliser cette classe pour déterminer le point le plus élevé sur le trajet de Denver à Grand Junction dans le Colorado, le représenter sur une carte et enregistrer la carte dans Google Drive.
// Get directions from Denver to Grand Junction.
const directions = Maps.newDirectionFinder()
.setOrigin('Denver, CO')
.setDestination('Grand Junction, CO')
.setMode(Maps.DirectionFinder.Mode.DRIVING)
.getDirections();
const route = directions.routes[0];
// Get elevation samples along the route.
const numberOfSamples = 30;
const response = Maps.newElevationSampler().samplePath(
route.overview_polyline.points,
numberOfSamples,
);
// Determine highest point.
let highestLocation = null;
let highestElevation = Number.MIN_VALUE;
for (const sample of response.results) {
if (sample.elevation > highestElevation) {
highestElevation = sample.elevation;
highestLocation = sample.location;
}
}
// Add the path and marker to a map.
const map = Maps.newStaticMap()
.addPath(route.overview_polyline.points)
.addMarker(highestLocation.lat, highestLocation.lng);
// Save the map to your drive
DriveApp.createFile(
Utilities.newBlob(map.getMapImage(), 'image/png', 'map.png'),
);
Voir aussi
Documentation détaillée
sampleLocation(latitude, longitude)
Renvoie les données d'altitude pour un seul point (lat/lng).
// Gets the elevation of Times Square using a point.
const data = Maps.newElevationSampler().sampleLocation(40.759011, -73.984472);
Logger.log(data.results[0].elevation);
Paramètres
Nom | Type | Description |
latitude | Number | latitude du point à échantillonner |
longitude | Number | la longitude du point à échantillonner ; |
Renvois
Object
: objet JSON contenant les données d'altitude, comme décrit ici
sampleLocations(points)
Renvoie des données d'altitude pour une série de points (lat/lng).
// Gets the elevation of Times Square and Central Park using points.
const data = Maps.newElevationSampler().sampleLocations([
// Times Square
40.759011,
-73.984472,
// Central Park
40.777052,
-73.975464,
]);
Logger.log(`Times Square: ${data.results[0].elevation}`);
Logger.log(`Central Park: ${data.results[1].elevation}`);
Paramètres
Nom | Type | Description |
points | Number[] | un tableau de paires latitude/longitude |
Renvois
Object
: objet JSON contenant les données d'altitude, comme décrit ici
sampleLocations(encodedPolyline)
Renvoie les données d'altitude des points d'une polyligne encodée.
// Gets the elevation of Times Square and Central Park using a polyline.
const data = Maps.newElevationSampler().sampleLocations('yvwwF|aqbMwoBiw@');
Logger.log(`Times Square: ${data.results[0].elevation}`);
Logger.log(`Central Park: ${data.results[1].elevation}`);
Paramètres
Nom | Type | Description |
encodedPolyline | String | une polyligne encodée de points à échantillonner |
Renvois
Object
: objet JSON contenant les données d'altitude, comme décrit ici
samplePath(points, numSamples)
Renvoie des données d'altitude pour un certain nombre d'échantillons le long d'une ligne, définie à l'aide d'une série de points.
// Gets the elevation of five points between Times Square and Central Park.
const data = Maps.newElevationSampler().samplePath(
[
// Times Square
40.759011,
-73.984472,
// Central Park
40.777052,
-73.975464,
],
5,
);
for (let i = 0; i < data.results.length; i++) {
Logger.log(data.results[i].elevation);
}
Paramètres
Nom | Type | Description |
points | Number[] | un tableau de paires latitude/longitude définissant un chemin à échantillonner |
numSamples | Integer | le nombre de points à échantillonner le long du chemin de points ; |
Renvois
Object
: objet JSON contenant les données d'altitude, comme décrit ici
samplePath(encodedPolyline, numSamples)
Renvoie les données d'altitude pour un certain nombre d'échantillons le long d'une ligne, définie à l'aide d'une polyligne encodée.
// Gets the elevation of five points between Times Square and Central Park.
const data = Maps.newElevationSampler().samplePath('yvwwF|aqbMwoBiw@', 5);
for (let i = 0; i < data.results.length; i++) {
Logger.log(data.results[i].elevation);
}
Paramètres
Nom | Type | Description |
encodedPolyline | String | une polyligne de points encodée définissant un chemin à échantillonner |
numSamples | Integer | le nombre de points à échantillonner le long du chemin de points ; |
Renvois
Object
: objet JSON contenant les données d'altitude, comme décrit ici
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/07/26 (UTC).
[null,null,["Dernière mise à jour le 2025/07/26 (UTC)."],[[["\u003cp\u003eThe \u003ccode\u003eElevationSampler\u003c/code\u003e class allows you to retrieve elevation data for specific locations or along a path.\u003c/p\u003e\n"],["\u003cp\u003eYou can sample elevation for single points, multiple points defined by latitude/longitude pairs or encoded polylines, and along paths.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003esampleLocation\u003c/code\u003e, \u003ccode\u003esampleLocations\u003c/code\u003e, and \u003ccode\u003esamplePath\u003c/code\u003e methods provide various ways to retrieve elevation data.\u003c/p\u003e\n"],["\u003cp\u003eResults are returned as a JSON object containing elevation, latitude, and longitude information for each sampled point.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eElevationSampler\u003c/code\u003e can be used for tasks such as finding the highest point along a route, as demonstrated in the provided example.\u003c/p\u003e\n"]]],[],null,["# Class ElevationSampler\n\nElevationSampler\n\nAllows for the sampling of elevations at particular locations. \n\nThe example below shows how you can use this class to determine the highest point along the route\nfrom Denver to Grand Junction in Colorado, plot it on a map, and save the map to Google Drive.\n\n```javascript\n// Get directions from Denver to Grand Junction.\nconst directions = Maps.newDirectionFinder()\n .setOrigin('Denver, CO')\n .setDestination('Grand Junction, CO')\n .setMode(Maps.DirectionFinder.Mode.DRIVING)\n .getDirections();\nconst route = directions.routes[0];\n\n// Get elevation samples along the route.\nconst numberOfSamples = 30;\nconst response = Maps.newElevationSampler().samplePath(\n route.overview_polyline.points,\n numberOfSamples,\n);\n\n// Determine highest point.\n\nlet highestLocation = null;\nlet highestElevation = Number.MIN_VALUE;\nfor (const sample of response.results) {\n if (sample.elevation \u003e highestElevation) {\n highestElevation = sample.elevation;\n highestLocation = sample.location;\n }\n}\n\n// Add the path and marker to a map.\nconst map = Maps.newStaticMap()\n .addPath(route.overview_polyline.points)\n .addMarker(highestLocation.lat, highestLocation.lng);\n\n// Save the map to your drive\nDriveApp.createFile(\n Utilities.newBlob(map.getMapImage(), 'image/png', 'map.png'),\n);\n```\n\n#### See also\n\n- [Google Elevation API](/maps/documentation/elevation) \n\n### Methods\n\n| Method | Return type | Brief description |\n|------------------------------------------------------------------------|-------------|-------------------------------------------------------------------------------------------------|\n| [sampleLocation(latitude, longitude)](#sampleLocation(Number,Number)) | `Object` | Returns elevation data for a single point (lat/lng). |\n| [sampleLocations(points)](#sampleLocations(Number)) | `Object` | Returns elevation data for a series of points (lat/lng). |\n| [sampleLocations(encodedPolyline)](#sampleLocations(String)) | `Object` | Returns elevation data for the points in an encoded polyline. |\n| [samplePath(points, numSamples)](#samplePath(Number,Integer)) | `Object` | Returns elevation data for a number of samples along a line, defined using a series of points. |\n| [samplePath(encodedPolyline, numSamples)](#samplePath(String,Integer)) | `Object` | Returns elevation data for a number of samples along a line, defined using an encoded polyline. |\n\nDetailed documentation\n----------------------\n\n### `sample``Location(latitude, longitude)`\n\nReturns elevation data for a single point (lat/lng).\n\n```javascript\n// Gets the elevation of Times Square using a point.\nconst data = Maps.newElevationSampler().sampleLocation(40.759011, -73.984472);\nLogger.log(data.results[0].elevation);\n```\n\n#### Parameters\n\n| Name | Type | Description |\n|-------------|----------|--------------------------------------|\n| `latitude` | `Number` | the latitude of the point to sample |\n| `longitude` | `Number` | the longitude of the point to sample |\n\n#### Return\n\n\n`Object` --- a JSON Object containing the elevation data, as described [here](/maps/documentation/elevation#ElevationResponses)\n\n*** ** * ** ***\n\n### `sample``Locations(points)`\n\nReturns elevation data for a series of points (lat/lng).\n\n```javascript\n// Gets the elevation of Times Square and Central Park using points.\nconst data = Maps.newElevationSampler().sampleLocations([\n // Times Square\n 40.759011,\n -73.984472,\n // Central Park\n 40.777052,\n -73.975464,\n]);\nLogger.log(`Times Square: ${data.results[0].elevation}`);\nLogger.log(`Central Park: ${data.results[1].elevation}`);\n```\n\n#### Parameters\n\n| Name | Type | Description |\n|----------|------------|--------------------------------------|\n| `points` | `Number[]` | an array of latitude/longitude pairs |\n\n#### Return\n\n\n`Object` --- a JSON Object containing the elevation data, as described [here](/maps/documentation/elevation#ElevationResponses)\n\n*** ** * ** ***\n\n### `sample``Locations(encodedPolyline)`\n\nReturns elevation data for the points in an encoded polyline.\n\n```javascript\n// Gets the elevation of Times Square and Central Park using a polyline.\nconst data = Maps.newElevationSampler().sampleLocations('yvwwF|aqbMwoBiw@');\nLogger.log(`Times Square: ${data.results[0].elevation}`);\nLogger.log(`Central Park: ${data.results[1].elevation}`);\n```\n\n#### Parameters\n\n| Name | Type | Description |\n|---------------------|----------|-----------------------------------------|\n| `encoded``Polyline` | `String` | an encoded polyline of points to sample |\n\n#### Return\n\n\n`Object` --- a JSON Object containing the elevation data, as described [here](/maps/documentation/elevation#ElevationResponses)\n\n*** ** * ** ***\n\n### `sample``Path(points, numSamples)`\n\nReturns elevation data for a number of samples along a line, defined using a series of points.\n\n```javascript\n// Gets the elevation of five points between Times Square and Central Park.\nconst data = Maps.newElevationSampler().samplePath(\n [\n // Times Square\n 40.759011,\n -73.984472,\n // Central Park\n 40.777052,\n -73.975464,\n ],\n 5,\n);\nfor (let i = 0; i \u003c data.results.length; i++) {\n Logger.log(data.results[i].elevation);\n}\n```\n\n#### Parameters\n\n| Name | Type | Description |\n|----------------|------------|---------------------------------------------------------------------|\n| `points` | `Number[]` | an array of latitude/longitude pairs defining a path to sample over |\n| `num``Samples` | `Integer` | the number of points to sample along the path of points |\n\n#### Return\n\n\n`Object` --- a JSON Object containing the elevation data, as described [here](/maps/documentation/elevation#ElevationResponses)\n\n*** ** * ** ***\n\n### `sample``Path(encodedPolyline, numSamples)`\n\nReturns elevation data for a number of samples along a line, defined using an encoded polyline.\n\n```javascript\n// Gets the elevation of five points between Times Square and Central Park.\nconst data = Maps.newElevationSampler().samplePath('yvwwF|aqbMwoBiw@', 5);\nfor (let i = 0; i \u003c data.results.length; i++) {\n Logger.log(data.results[i].elevation);\n}\n```\n\n#### Parameters\n\n| Name | Type | Description |\n|---------------------|-----------|--------------------------------------------------------------|\n| `encoded``Polyline` | `String` | an encoded polyline of points defining a path to sample over |\n| `num``Samples` | `Integer` | the number of points to sample along the path of points |\n\n#### Return\n\n\n`Object` --- a JSON Object containing the elevation data, as described [here](/maps/documentation/elevation#ElevationResponses)"]]