"JAXA Earth API for JavaScript" examples on the Observable by the JAXA Earth Observation Research Center
Digital Surface Model - JAXA AW3DDigital Surface Model (JAXA AW3D) data on the OpenLayersSea Level Rise SimulatorCross Section Shape of the Mt. Fuji - JAXA AW3DDraw Hillshade Maps - JAXA AW3DDraw Hillshade Maps on the OpenLayers
Correlation between elevation and land surface temperature by using satellite data
je = require("https://data.earth.jaxa.jp/api/javascript/v1.2.3/jaxa.earth.umd.js");
//Central part of honshu, Japan 日本の中部地方
center = ({lat: 35.71, lng: 138.19})
//Hokkaido, Japan 日本の北海道
//center = ({lat: 43.50, lng: 143.00})
//Rocky Mountains, USA アメリカのロッキー山脈
//center = ({lat: 44.3, lng: -110.0})
//The Alps, Europe ヨーロッパのアルプス山脈
//center = ({lat: 47.0, lng: 8.0})
//Mt. Kilimanjaro, Africa アフリカのキリマンジャロ山
//center = ({lat: -3.0, lng: 37.35})
elevationImage = await je.getImage({
collection: "https://s3.ap-northeast-1.wasabisys.com/je-pds/cog/v1/JAXA.EORC_ALOS.PRISM_AW3D30.v3.2_global/collection.json",
band: "DSM",
width: size, //pixels
height: size, //pixels
bbox: [center.lng - margin,center.lat - margin,center.lng + margin,center.lat + margin], //[west, south, east, north]
});
elevationData = elevationImage.getData();
elevationColorMap = new je.image.ColorMap(elevationData.min, elevationData.max, "jet");
je.image.createImage(elevationData, elevationColorMap).getCanvas();
lstImage = await je.getImage({
collection: "https://s3.ap-northeast-1.wasabisys.com/je-pds/cog/v1/JAXA.G-Portal_GCOM-C.SGLI_standard.L3-LST.daytime.v3_global_monthly/collection.json",
date: new Date(Date.UTC(2021, 12-1)),
band: "LST",
width: size, //pixels
height: size, //pixels
bbox: [center.lng - margin,center.lat - margin,center.lng + margin,center.lat + margin], //[west, south, east, north]
});
lstData = lstImage.getData();
lstColorMap = new je.image.ColorMap(lstData.min, lstData.max, "jet");
je.image.createImage(lstData, lstColorMap).getCanvas();
array = {
const array = [];
for(let k=0;k<size * size;k++){
//ignore NaN (such as sea, no data) and elevation 0[m] (sea)
//NaN（非数値。外洋やデータが観測されていない部分など）や標高0m（海など）を無視
if(isNaN(elevationData.data[k])) continue;
if(elevationData.data[k] < 1) continue;
if(isNaN(lstData.data[k])) continue;
array.push({
elevation: elevationData.data[k],
lst: lstData.data[k] - 273.15 //change unit from [K] to [deg C] 単位を[ケルビン]から[℃]に変換
});
}
return array;
}
Plot.plot({
x: {
grid: true,
domain: [0, elevationData.max],
},
y: {
grid: true,
},
marks: [
Plot.dot(array, {x: "elevation", y: "lst", strokeOpacity: 0.1, r: 2}),
Plot.linearRegressionY(array, {x: "elevation", y: "lst", stroke: "red", strokeWidth: 5})
]
})
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