Hi, I am trying to run Leaflet and Process API simple code by using the geometry parameter. When I call the RGB image with evalscript, it duplicates all images to fit the screen.
At the bottom of the code, ‘3_NDVI’ layer works correctly, but when the geometry parameter is given as an input, a white image is displayed.
Can you help me solve these two problems?
<html>
<link
rel="stylesheet"
href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
crossorigin=""
/>
<script
src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
crossorigin=""
></script>
<script>
/*************************
# Sentinel Hub OAuth2 + Process API Leaflet
How to use:
1) enter SentinelHub client ID and secret
(go to SH Dashboard -> User settings -> OAuth clients -> "+")
2) open this file in browser
*************************/
const CLIENT_ID = "ec765b75-3708-4e9a-MASK";
const CLIENT_SECRET = ".^F[XXGS2De}RO)-MASK";
const fromDate = "2020-07-01T00:00:00.000Z";
const toDate = "2020-09-01T00:00:00.000Z";
const dataset = "S2L2A";
const evalscript = `//VERSION=3
function setup() {
return {
input: ["B02", "B03", "B04"],
output: { bands: 3 }
};
}
function evaluatePixel(sample) {
return [2.5 * sample.B04, 2.5 * sample.B03, 2.5 * sample.B02];
}
`;
// Promise which will fetch Sentinel Hub authentication token:
const authTokenPromise = fetch(
"https://services.sentinel-hub.com/oauth/token",
{
method: "post",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: `grant_type=client_credentials&client_id=${encodeURIComponent(
CLIENT_ID
)}&client_secret=${encodeURIComponent(CLIENT_SECRET)}`,
}
)
.then((response) => response.json())
.then((auth) => auth["access_token"]);
// We need to extend Leaflet's GridLayer to add support for loading images through
// Sentinel Hub Process API:
L.GridLayer.SHProcessLayer = L.GridLayer.extend({
createTile: function (coords, done) {
const tile = L.DomUtil.create("img", "leaflet-tile");
const tileSize = this.options.tileSize;
tile.width = tileSize;
tile.height = tileSize;
const nwPoint = coords.multiplyBy(tileSize);
const sePoint = nwPoint.add([tileSize, tileSize]);
const nw = L.CRS.EPSG3857.project(
this._map.unproject(nwPoint, coords.z)
);
const se = L.CRS.EPSG3857.project(
this._map.unproject(sePoint, coords.z)
);
authTokenPromise.then((authToken) => {
// Construct Process API request payload:
// https://docs.sentinel-hub.com/api/latest/reference/#tag/process
const payload = {
input: {
bounds: {
properties: {
crs: "http://www.opengis.net/def/crs/EPSG/0/4326",
},
geometry: {
type: "Polygon",
coordinates: [
[
[
37.039246559143066,
39.243321766546885
],
[
37.03971862792969,
39.240928698337044
],
[
37.04358100891113,
39.24139402354953
],
[
37.04315185546875,
39.24358765797508
],
[
37.039246559143066,
39.243321766546885
]
]
]
}
},
data: [
{
dataFilter: {
timeRange: {
from: fromDate,
to: toDate,
},
mosaickingOrder: "mostRecent",
},
processing: {},
type: dataset,
},
],
},
output: {
width: 512,
height: 512,
responses: [
{
identifier: "default",
format: {
type: "image/jpeg",
},
},
],
},
evalscript: evalscript,
};
// Fetch the image:
fetch("https://services.sentinel-hub.com/api/v1/process", {
method: "post",
headers: {
Authorization: "Bearer " + authToken,
"Content-Type": "application/json",
Accept: "*/*",
},
body: JSON.stringify(payload),
})
.then((response) => response.blob())
.then((blob) => {
const objectURL = URL.createObjectURL(blob);
tile.onload = () => {
URL.revokeObjectURL(objectURL);
done(null, tile);
};
tile.src = objectURL;
})
.catch((err) => done(err, null));
});
return tile;
},
});
L.gridLayer.shProcessLayer = function (opts) {
return new L.GridLayer.SHProcessLayer(opts);
};
const sentinelHub = L.gridLayer.shProcessLayer();
// OpenStreetMap layer:
let osm = L.tileLayer("http://{s}.tile.osm.org/{z}/{x}/{y}.png", {
attribution:
'© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors',});
let baseUrl = "https://services.sentinel-hub.com/ogc/wms/3abdcd69-52ca-45f5-be4e-1d21b852015e";
sentinelHubNDVI = L.tileLayer.wms(baseUrl, {
attribution: '© <a href="http://www.sentinel-hub.com/" target="_blank">Sentinel Hub</a>',
urlProcessingApi:"https://services.sentinel-hub.com/ogc/wms/3abdcd69-52ca-45f5-be4e-1d21b852015e",
maxcc:100,
minZoom:6,
maxZoom:16,
preset:"3_NDVI",
layers:"3_NDVI",
//bbox: "4128822.5198520813,4754994.655564247,4148390.3990930864,4774562.534805251",
geometry: "POLYGON((37.03889075625871 39.24440048681443,37.03906241763566 39.241043572470225,37.04442683566545 39.24120976012829,37.04408351291154 39.244566666519425,37.03889075625871 39.24440048681443))",
transparent:"true",
});
// configure Leaflet:
let baseMaps = {
OpenStreetMap: osm,
};
let overlayMaps = {
"Sentinel Hub Process API": sentinelHub,
'NDVI': sentinelHubNDVI,
};
let map = L.map("map", {
center: [39.243276, 37.042575], // lat/lng in EPSG:4326
zoom: 16,
layers: [osm, sentinelHub],
});
L.control.layers(baseMaps, overlayMaps).addTo(map);
</script>
