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77 lines
2.9 KiB
JavaScript
77 lines
2.9 KiB
JavaScript
2 weeks ago
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//TODO: rewrite exif2geojson module and export
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/** Convert a list of image file or a list of image into geojson
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* reading location in the EXIF tags
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* @constructor
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* @param {Array<Image|File>} img the array to process
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* @param {} options
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* @param {boolean} camera true to get camera info
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* @param {boolean} options.date true to get photo date
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* @param {boolean} options.image true to get image info
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* @param {function} options.loading a callback function that take the number of image to process
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* @param {function} options.onLoad callback function that takes a geojson when loaded
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* @require Exif-JS [https://github.com/exif-js/exif-js]
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*/
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/* global EXIF */
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var exif2geojson;
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(function(){
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// Get fractionnal number
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function getNumber(n) { return n.numerator / n.denominator; }
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// Convert to DMS
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function getDMS(l) {
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if (l) return getNumber(l[0]) + getNumber(l[1]) /60 + getNumber(l[2]) /3600;
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else return null;
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}
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// Constructor
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exif2geojson = function (img, options) {
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options = options || {};
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if (typeof(options.loading) !== "function") options.loading = function(){};
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if (typeof(options.onLoad) !== "function") options.onLoad = function(json){ console.log(json); };
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//
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var json = {
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"type": "FeatureCollection",
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"features": []
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};
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var nb = img.length;
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for (var i=0, f; f=img[i]; i++) {
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EXIF.getData(f, function() {
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// console.log(this);
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if (this.exifdata.GPSLongitudeRef) {
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// json feature
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var fjs = {
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"type": "Feature",
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"properties": {},
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"geometry": {
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"type": "Point",
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"coordinates": []
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}
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};
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json.features.push (fjs)
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fjs.geometry.coordinates = [
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(this.exifdata.GPSLongitudeRef=='E'? 1: -1) * getDMS(this.exifdata.GPSLongitude),
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(this.exifdata.GPSLatitudeRef=='N'? 1: -1) * getDMS(this.exifdata.GPSLatitude)
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];
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if (this.exifdata.GPSAltitude) fjs.geometry.coordinates.push (getNumber(this.exifdata.GPSAltitude));
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fjs.properties.url = this.src || this.name;
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if (this.exifdata.ImageDescription) fjs.properties.description = this.exifdata.ImageDescription;
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if (options.date && this.exifdata.DateTime) fjs.properties.date = this.exifdata.DateTime;
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// Camera info
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if (options.camera) {
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if (this.exifdata.Make) fjs.properties.make = this.exifdata.Make;
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if (this.exifdata.Model) fjs.properties.model = this.exifdata.Model.replace(new RegExp(String.fromCharCode(0),'g'),"");
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}
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// Image info
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if (options.image) {
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fjs.properties.size = this.size;
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fjs.properties.type = this.type;
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if (this.exifdata.ImageHeight) fjs.properties.height = this.exifdata.ImageHeight;
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if (this.exifdata.ImageWidth) fjs.properties.width = this.exifdata.ImageWidth;
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}
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}
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nb--;
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options.loading(nb)
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if (!nb) options.onLoad(json);
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});
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}
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}
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})();
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