96 lines
4.0 KiB
HTML
96 lines
4.0 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<title>UPlanet Sat</title>
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<link rel="stylesheet" href="leaflet.css" />
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<style>
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.map-container {
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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}
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</style>
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</head>
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<body>
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<div id="map" class="map-container"></div>
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<br>
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<script src="leaflet.js"></script>
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<script>
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// const desiredImageWidthInKm = 11; // Now Is calculated from northEastLon - southWestLon
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const tileSizeInPixels = 256;
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function calculateZoomLevel(desiredImageWidthInKm, latitude) {
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const earthEquatorialCircumference = 40075016.686; // Earth's equatorial circumference in meters
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// Calculate the distance covered by one degree of longitude at the given latitude
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const metersPerLongitudeDegree = earthEquatorialCircumference * Math.cos((Math.PI / 180) * latitude) / 360;
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const metersPerPixel = metersPerLongitudeDegree * 360 / (tileSizeInPixels * Math.pow(2, 20));
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// Calculate the number of pixels needed to achieve the desired width
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const numberOfPixelsHorizontally = (desiredImageWidthInKm * 1000) / metersPerPixel;
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// Calculate the appropriate zoom level
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const zoomLevel = Math.log2(tileSizeInPixels * Math.pow(2, 20) / numberOfPixelsHorizontally);
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return zoomLevel;
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}
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// Function to extract URL parameters
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function getUrlParameter(name) {
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name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
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const regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
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const results = regex.exec(location.search);
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return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
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}
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const defaultSouthWestLat = 0.00;
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const defaultSouthWestLon = 0.00;
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const defaultOffsetDegrees = 10.00; // 10° offset
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const southWestLat = parseFloat(getUrlParameter('southWestLat')) || defaultSouthWestLat;
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console.log('Lat:', southWestLat);
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const southWestLon = parseFloat(getUrlParameter('southWestLon')) || defaultSouthWestLon;
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console.log('Lon:', southWestLon);
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const deg = parseFloat(getUrlParameter('deg')) || defaultOffsetDegrees;
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console.log('Offset:', deg);
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// Calculate northEastLat and northEastLon with deg° offset only if parameters are empty
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const northEastLatParam = getUrlParameter('northEastLat');
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const northEastLonParam = getUrlParameter('northEastLon');
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const northEastLat = northEastLatParam ? parseFloat(northEastLatParam) : southWestLat + deg;
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const northEastLon = northEastLonParam ? parseFloat(northEastLonParam) : southWestLon + deg;
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// Calculate the longitudinal distance in degrees
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const lonDistanceInDegrees = Math.abs(northEastLon - southWestLon);
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console.log('lonDistanceInDegrees:', lonDistanceInDegrees);
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// Calculate the desired image width in kilometers
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const earthEquatorialCircumference = 40075016.686; // Earth's equatorial circumference in meters
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const metersPerLongitudeDegree = Math.abs(earthEquatorialCircumference * Math.cos((Math.PI / 180) * southWestLat) / 360);
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const desiredImageWidthInMeters = lonDistanceInDegrees * metersPerLongitudeDegree;
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const desiredImageWidthInKm = desiredImageWidthInMeters / 1000;
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console.log('desiredImageWidthInKm:', desiredImageWidthInKm);
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const centerLat = (southWestLat + northEastLat) / 2;
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const centerLon = (southWestLon + northEastLon) / 2;
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// Provide the latitude for adjustment
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const latitude = centerLat;
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const zoomLevel = calculateZoomLevel(desiredImageWidthInKm, latitude);
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// const zoomLevel = calculateZoomLevel(desiredImageWidthInKm, latitude) + 2;
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console.log('Recommended zoom level:', zoomLevel);
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const map = L.map('map', {
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zoomControl: false // Disable the default zoom control
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}).setView([centerLat, centerLon], zoomLevel);
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L.tileLayer('https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}', {
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attribution: `U Planet | Astroport | ${southWestLat} : ${southWestLon}`
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}).addTo(map);
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</script>
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</body>
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</html>
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