Encoder les LatLng d'un tableau Array avec encodePath

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Encoder un tableau Array de LatLng avec la méthode encodePath

L'encodage permet de compresser les données nécessaires à la construction d'une polyline ou d'un plygone. Ce gain de poids peut être exploité lors du stockage des données dans une base de données ou pour accélérer leur transfert sur le réseau ( JSON ou XML ).

Pour encoder un tableau Array de LatLng, il suffit d'utiliser la méthode encodePath présente dans la bibliothèque Geometry Library.

La valeur retournée est une chaîne de caractères {string}.

/**
 * Le tableau Array nommé tableauLatLng
 * contient l'ensemble des LatLng à encoder.
 */
var tableauLatLng = [ 
	new google.maps.LatLng(47.42968024, 1.08501332),
	new google.maps.LatLng(47.40863250, 1.11052710),
	new google.maps.LatLng(47.39847023, 1.11339735),
	 ...... etc ....
	new google.maps.LatLng(47.44568696, 1.13191347),
	new google.maps.LatLng(47.42924237, 1.11475930),
	new google.maps.LatLng(47.42968024, 1.08501332)
];

/**
 * La variable donneesEncodees reçoit la chaîne encodée.
 */
var donneesEncodees = google.maps.geometry.encoding.encodePath( tableauLatLng );
		

Attention : n'oubliez pas d'ajouter la bibliothèque geometry lorsque vous appelez le script de l'API Google Maps v3 :

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=geometry"></script>

Résultat de l'encodage d'un tableau Array de LatLng avec la méthode encodePath

Array de LatLng (données brutes) Données une fois encodées

Exemple de code pour encoder les LatLng d'un tableau Array avec la méthode encodePath

<!DOCTYPE html>
<html lang="fr">
	<head>
		<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
		<meta charset="UTF-8" />
		<title>Titre de votre page</title>
		<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=geometry"></script>
		<script type="text/javascript">
			function initialisation(){
				var tableauLatLng = [ 
					new google.maps.LatLng(47.42968024, 1.08501332),
					new google.maps.LatLng(47.40863250, 1.11052710),
					new google.maps.LatLng(47.39847023, 1.11339735),
					new google.maps.LatLng(47.39037110, 1.12169048),
					new google.maps.LatLng(47.38365268, 1.12185672),
					new google.maps.LatLng(47.38165632, 1.11851140),
					new google.maps.LatLng(47.37288439, 1.10740204),
					new google.maps.LatLng(47.36714826, 1.10688532),
					new google.maps.LatLng(47.35506845, 1.12241454),
					new google.maps.LatLng(47.35010468, 1.11578959),
					new google.maps.LatLng(47.33439640, 1.10724253),
					new google.maps.LatLng(47.33108483, 1.10631308),
					new google.maps.LatLng(47.32853327, 1.09485991),
					new google.maps.LatLng(47.30160900, 1.10598661),
					new google.maps.LatLng(47.29840202, 1.10812351),
					new google.maps.LatLng(47.29454306, 1.13122139),
					new google.maps.LatLng(47.27219886, 1.16206063),
					new google.maps.LatLng(47.28556521, 1.17337523),
					new google.maps.LatLng(47.28860459, 1.17412885),
					new google.maps.LatLng(47.28491752, 1.18243258),
					new google.maps.LatLng(47.28441775, 1.19723765),
					new google.maps.LatLng(47.28902962, 1.21528003),
					new google.maps.LatLng(47.29238933, 1.21570011),
					new google.maps.LatLng(47.29361222, 1.21934918),
					new google.maps.LatLng(47.29417247, 1.22333091),
					new google.maps.LatLng(47.28662943, 1.24256654),
					new google.maps.LatLng(47.28366097, 1.24364529),
					new google.maps.LatLng(47.27825985, 1.24329305),
					new google.maps.LatLng(47.27573009, 1.24215510),
					new google.maps.LatLng(47.25727671, 1.26495846),
					new google.maps.LatLng(47.25593912, 1.27499997),
					new google.maps.LatLng(47.24097996, 1.28797848),
					new google.maps.LatLng(47.22337195, 1.30168767),
					new google.maps.LatLng(47.22001712, 1.30278253),
					new google.maps.LatLng(47.21696491, 1.30451841),
					new google.maps.LatLng(47.19387363, 1.32202901),
					new google.maps.LatLng(47.19120800, 1.32376882),
					new google.maps.LatLng(47.18622236, 1.32666077),
					new google.maps.LatLng(47.17355812, 1.34353633),
					new google.maps.LatLng(47.15371302, 1.35089400),
					new google.maps.LatLng(47.13826760, 1.36185757),
					new google.maps.LatLng(47.13508173, 1.36374806),
					new google.maps.LatLng(47.13158451, 1.36403564),
					new google.maps.LatLng(47.12111614, 1.36446279),
					new google.maps.LatLng(47.10847324, 1.35566558),
					new google.maps.LatLng(47.10620034, 1.35183320),
					new google.maps.LatLng(47.10046198, 1.33947341),
					new google.maps.LatLng(47.10465044, 1.32664213),
					new google.maps.LatLng(47.10294134, 1.31749198),
					new google.maps.LatLng(47.09361953, 1.31127852),
					new google.maps.LatLng(47.08387564, 1.31628544),
					new google.maps.LatLng(47.07387977, 1.31218245),
					new google.maps.LatLng(47.07225681, 1.29377624),
					new google.maps.LatLng(47.06896593, 1.29299877),
					new google.maps.LatLng(47.06285813, 1.28915451),
					new google.maps.LatLng(47.05040679, 1.27253541),
					new google.maps.LatLng(47.04080404, 1.27609488),
					new google.maps.LatLng(47.02082940, 1.24899326),
					new google.maps.LatLng(47.01994778, 1.24426187),
					new google.maps.LatLng(47.01414657, 1.23222516),
					new google.maps.LatLng(47.01704672, 1.22974500),
					new google.maps.LatLng(47.02491193, 1.22063612),
					new google.maps.LatLng(47.02829390, 1.20673688),
					new google.maps.LatLng(47.02768832, 1.20280228),
					new google.maps.LatLng(47.03171225, 1.19304562),
					new google.maps.LatLng(47.03406686, 1.19007542),
					new google.maps.LatLng(47.04103930, 1.18106781),
					new google.maps.LatLng(47.04122198, 1.17598366),
					new google.maps.LatLng(47.03936016, 1.16099434),
					new google.maps.LatLng(47.02443701, 1.11557352),
					new google.maps.LatLng(47.02676445, 1.11277064),
					new google.maps.LatLng(47.02923895, 1.11026547),
					new google.maps.LatLng(47.02817327, 1.10568445),
					new google.maps.LatLng(47.01583979, 1.07761895),
					new google.maps.LatLng(47.00050787, 1.07020562),
					new google.maps.LatLng(46.99644065, 1.05637507),
					new google.maps.LatLng(46.98028310, 1.05169841),
					new google.maps.LatLng(46.97200722, 1.05991566),
					new google.maps.LatLng(46.96864234, 1.05992852),
					new google.maps.LatLng(46.95882358, 1.06293441),
					new google.maps.LatLng(46.94968173, 1.05803977),
					new google.maps.LatLng(46.94511697, 1.04491829),
					new google.maps.LatLng(46.94353675, 1.04122514),
					new google.maps.LatLng(46.94206331, 1.03743767),
					new google.maps.LatLng(46.93869869, 1.03588999),
					new google.maps.LatLng(46.90735497, 1.03383904),
					new google.maps.LatLng(46.87975105, 1.02522672),
					new google.maps.LatLng(46.87966487, 1.02555819),
					new google.maps.LatLng(46.85445233, 1.01692481),
					new google.maps.LatLng(46.84849942, 1.02028364),
					new google.maps.LatLng(46.84562033, 1.02264888),
					new google.maps.LatLng(46.84425247, 1.01793513),
					new google.maps.LatLng(46.83528245, 1.01020907),
					new google.maps.LatLng(46.81444675, 1.00892597),
					new google.maps.LatLng(46.80165466, 0.98534054),
					new google.maps.LatLng(46.79089106, 1.00433090),
					new google.maps.LatLng(46.78104145, 0.99996350),
					new google.maps.LatLng(46.76876279, 1.00952589),
					new google.maps.LatLng(46.76619967, 1.01118645),
					new google.maps.LatLng(46.75781055, 1.01169354),
					new google.maps.LatLng(46.75848232, 1.00678038),
					new google.maps.LatLng(46.76255388, 0.98256139),
					new google.maps.LatLng(46.75603931, 0.97959574),
					new google.maps.LatLng(46.74000797, 0.96103354),
					new google.maps.LatLng(46.73661972, 0.94723392),
					new google.maps.LatLng(46.73862602, 0.94351764),
					new google.maps.LatLng(46.75555810, 0.93004089),
					new google.maps.LatLng(46.75644392, 0.91661111),
					new google.maps.LatLng(46.75713172, 0.91186657),
					new google.maps.LatLng(46.75456487, 0.88450636),
					new google.maps.LatLng(46.74821948, 0.86747592),
					new google.maps.LatLng(46.75103885, 0.86560570),
					new google.maps.LatLng(46.75572329, 0.85974356),
					new google.maps.LatLng(46.75915653, 0.85873310),
					new google.maps.LatLng(46.76301643, 0.84485355),
					new google.maps.LatLng(46.77686904, 0.82940699),
					new google.maps.LatLng(46.78682247, 0.82610414),
					new google.maps.LatLng(46.79167523, 0.81335038),
					new google.maps.LatLng(46.80500372, 0.81560801),
					new google.maps.LatLng(46.81419047, 0.81017172),
					new google.maps.LatLng(46.81589599, 0.80986131),
					new google.maps.LatLng(46.81921444, 0.80904641),
					new google.maps.LatLng(46.82913453, 0.80800494),
					new google.maps.LatLng(46.83289686, 0.79466885),
					new google.maps.LatLng(46.84123124, 0.78689020),
					new google.maps.LatLng(46.84734752, 0.79664236),
					new google.maps.LatLng(46.85052090, 0.79501715),
					new google.maps.LatLng(46.85095540, 0.77139616),
					new google.maps.LatLng(46.85584449, 0.76636148),
					new google.maps.LatLng(46.86126394, 0.77180512),
					new google.maps.LatLng(46.86512083, 0.76564508),
					new google.maps.LatLng(46.86058853, 0.75343291),
					new google.maps.LatLng(46.87159107, 0.74353125),
					new google.maps.LatLng(46.87285533, 0.73926748),
					new google.maps.LatLng(46.88318244, 0.72947397),
					new google.maps.LatLng(46.88609418, 0.72728715),
					new google.maps.LatLng(46.90289002, 0.70467502),
					new google.maps.LatLng(46.90936363, 0.70374480),
					new google.maps.LatLng(46.91772474, 0.70892797),
					new google.maps.LatLng(46.92582240, 0.70317977),
					new google.maps.LatLng(46.93611405, 0.70617784),
					new google.maps.LatLng(46.95937304, 0.69598384),
					new google.maps.LatLng(46.96224177, 0.69517345),
					new google.maps.LatLng(46.96571850, 0.69490960),
					new google.maps.LatLng(46.97498261, 0.69017011),
					new google.maps.LatLng(46.97898879, 0.66046567),
					new google.maps.LatLng(46.98518471, 0.65589386),
					new google.maps.LatLng(46.98825464, 0.64680341),
					new google.maps.LatLng(46.98525129, 0.63779864),
					new google.maps.LatLng(46.98665520, 0.63355960),
					new google.maps.LatLng(46.99368441, 0.62398505),
					new google.maps.LatLng(46.99941216, 0.62189672),
					new google.maps.LatLng(47.00241686, 0.62365679),
					new google.maps.LatLng(47.00751375, 0.61849424),
					new google.maps.LatLng(47.00672340, 0.59055307),
					new google.maps.LatLng(47.00610372, 0.58590340),
					new google.maps.LatLng(47.00628437, 0.56774432),
					new google.maps.LatLng(47.00253774, 0.56694689),
					new google.maps.LatLng(46.99966428, 0.56792275),
					new google.maps.LatLng(46.99243884, 0.57437966),
					new google.maps.LatLng(46.98946847, 0.57315017),
					new google.maps.LatLng(46.98338484, 0.57369159),
					new google.maps.LatLng(46.98087006, 0.57687705),
					new google.maps.LatLng(46.97492233, 0.59880332),
					new google.maps.LatLng(46.95888599, 0.60170030),
					new google.maps.LatLng(46.95643070, 0.59821795),
					new google.maps.LatLng(46.95577136, 0.56330750),
					new google.maps.LatLng(46.95847291, 0.55420243),
					new google.maps.LatLng(46.95958839, 0.54955221),
					new google.maps.LatLng(46.95586221, 0.51290377),
					new google.maps.LatLng(46.95990582, 0.50519606),
					new google.maps.LatLng(46.95779424, 0.50257366),
					new google.maps.LatLng(46.95531864, 0.49128995),
					new google.maps.LatLng(46.95401722, 0.48647204),
					new google.maps.LatLng(46.94115233, 0.44480394),
					new google.maps.LatLng(46.93811446, 0.44388596),
					new google.maps.LatLng(46.92957893, 0.43870834),
					new google.maps.LatLng(46.93167022, 0.43452277),
					new google.maps.LatLng(46.93638940, 0.42074499),
					new google.maps.LatLng(46.93613155, 0.40537091),
					new google.maps.LatLng(46.93819306, 0.40114383),
					new google.maps.LatLng(46.94370880, 0.38781863),
					new google.maps.LatLng(46.94374982, 0.38282396),
					new google.maps.LatLng(46.94856801, 0.36463241),
					new google.maps.LatLng(46.93636828, 0.34807858),
					new google.maps.LatLng(46.93670434, 0.34312481),
					new google.maps.LatLng(46.93094955, 0.32535469),
					new google.maps.LatLng(46.93262834, 0.32102225),
					new google.maps.LatLng(46.93970665, 0.31057416),
					new google.maps.LatLng(46.95531411, 0.30203470),
					new google.maps.LatLng(46.95835450, 0.30302377),
					new google.maps.LatLng(46.96393108, 0.30641470),
					new google.maps.LatLng(46.97126400, 0.29821018),
					new google.maps.LatLng(46.97892767, 0.30658476),
					new google.maps.LatLng(46.99026695, 0.29144110),
					new google.maps.LatLng(46.99016062, 0.29608637),
					new google.maps.LatLng(46.99730433, 0.31073110),
					new google.maps.LatLng(46.99992293, 0.30817391),
					new google.maps.LatLng(47.00248833, 0.30515543),
					new google.maps.LatLng(47.02110779, 0.30059571),
					new google.maps.LatLng(47.02803136, 0.30994073),
					new google.maps.LatLng(47.03130061, 0.30906716),
					new google.maps.LatLng(47.04727131, 0.30789799),
					new google.maps.LatLng(47.05397004, 0.29842778),
					new google.maps.LatLng(47.05194756, 0.29450185),
					new google.maps.LatLng(47.04404362, 0.26768267),
					new google.maps.LatLng(47.04642902, 0.26422038),
					new google.maps.LatLng(47.06850899, 0.26355225),
					new google.maps.LatLng(47.07094310, 0.24387200),
					new google.maps.LatLng(47.06916428, 0.23515611),
					new google.maps.LatLng(47.06638619, 0.23284148),
					new google.maps.LatLng(47.06132204, 0.22806192),
					new google.maps.LatLng(47.05323449, 0.20819382),
					new google.maps.LatLng(47.06300351, 0.19439948),
					new google.maps.LatLng(47.05945508, 0.18034476),
					new google.maps.LatLng(47.06072670, 0.17569622),
					new google.maps.LatLng(47.06419290, 0.17673016),
					new google.maps.LatLng(47.07073952, 0.17450408),
					new google.maps.LatLng(47.08940780, 0.19779886),
					new google.maps.LatLng(47.10404254, 0.18535326),
					new google.maps.LatLng(47.11450970, 0.18348196),
					new google.maps.LatLng(47.11336033, 0.17924514),
					new google.maps.LatLng(47.10835728, 0.16783376),
					new google.maps.LatLng(47.10011024, 0.16192025),
					new google.maps.LatLng(47.10273845, 0.15861099),
					new google.maps.LatLng(47.10837163, 0.13494584),
					new google.maps.LatLng(47.11526768, 0.13413539),
					new google.maps.LatLng(47.12459028, 0.14068793),
					new google.maps.LatLng(47.12225805, 0.13731585),
					new google.maps.LatLng(47.12099883, 0.12795377),
					new google.maps.LatLng(47.12693382, 0.12396446),
					new google.maps.LatLng(47.12928965, 0.11032459),
					new google.maps.LatLng(47.12079355, 0.10471793),
					new google.maps.LatLng(47.12185198, 0.09019821),
					new google.maps.LatLng(47.11779427, 0.08243016),
					new google.maps.LatLng(47.12063300, 0.07987166),
					new google.maps.LatLng(47.14633374, 0.07839373),
					new google.maps.LatLng(47.14406029, 0.06895283),
					new google.maps.LatLng(47.14607776, 0.06492336),
					new google.maps.LatLng(47.16461169, 0.05373939),
					new google.maps.LatLng(47.16736909, 0.05664383),
					new google.maps.LatLng(47.17638748, 0.06351912),
					new google.maps.LatLng(47.18979432, 0.06659370),
					new google.maps.LatLng(47.19095238, 0.06188429),
					new google.maps.LatLng(47.19885600, 0.05379775),
					new google.maps.LatLng(47.21418919, 0.06829312),
					new google.maps.LatLng(47.21448627, 0.07287684),
					new google.maps.LatLng(47.21634609, 0.07639082),
					new google.maps.LatLng(47.21987752, 0.07245067),
					new google.maps.LatLng(47.23351159, 0.07383049),
					new google.maps.LatLng(47.24332588, 0.06909277),
					new google.maps.LatLng(47.25192076, 0.07636784),
					new google.maps.LatLng(47.27168330, 0.08010585),
					new google.maps.LatLng(47.27414608, 0.08317663),
					new google.maps.LatLng(47.27551694, 0.08748237),
					new google.maps.LatLng(47.28237719, 0.08855585),
					new google.maps.LatLng(47.28686424, 0.08237594),
					new google.maps.LatLng(47.30819955, 0.10030330),
					new google.maps.LatLng(47.31572342, 0.11110376),
					new google.maps.LatLng(47.32883939, 0.11788989),
					new google.maps.LatLng(47.33234057, 0.11745323),
					new google.maps.LatLng(47.33535730, 0.13548960),
					new google.maps.LatLng(47.34281815, 0.14443491),
					new google.maps.LatLng(47.34537316, 0.14729705),
					new google.maps.LatLng(47.35871482, 0.14284312),
					new google.maps.LatLng(47.36179906, 0.14039868),
					new google.maps.LatLng(47.36308964, 0.15385464),
					new google.maps.LatLng(47.36531208, 0.15765902),
					new google.maps.LatLng(47.38194028, 0.18213801),
					new google.maps.LatLng(47.38600984, 0.16872393),
					new google.maps.LatLng(47.39615122, 0.16824550),
					new google.maps.LatLng(47.39872411, 0.15385288),
					new google.maps.LatLng(47.40144282, 0.15677803),
					new google.maps.LatLng(47.41659889, 0.18093645),
					new google.maps.LatLng(47.42621555, 0.18514870),
					new google.maps.LatLng(47.42958652, 0.18448090),
					new google.maps.LatLng(47.45322102, 0.18087433),
					new google.maps.LatLng(47.45575019, 0.18424796),
					new google.maps.LatLng(47.47640960, 0.19884856),
					new google.maps.LatLng(47.48449611, 0.20064778),
					new google.maps.LatLng(47.48660313, 0.20414741),
					new google.maps.LatLng(47.50194934, 0.22010412),
					new google.maps.LatLng(47.50518142, 0.21971003),
					new google.maps.LatLng(47.52727485, 0.22483570),
					new google.maps.LatLng(47.52666293, 0.20716495),
					new google.maps.LatLng(47.53293435, 0.20563846),
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				var donneesEncodees = google.maps.geometry.encoding.encodePath(tableauLatLng);
				document.getElementById("info").innerHTML = donneesEncodees;
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			google.maps.event.addDomListener( window, "load", initialisation );
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	</head>
	<body>
		<div id="info"></div>
		<noscript>
			<p>Attention : </p>
			<p>Afin de pouvoir utiliser Google Maps, JavaScript doit être activé.</p>
			<p>Or, il semble que JavaScript est désactivé ou qu'il ne soit pas supporté par votre navigateur.</p>
			<p>Pour afficher Google Maps, activez JavaScript en modifiant les options de votre navigateur, puis essayez à nouveau.</p>
		</noscript>
	</body>
</html>