![]() For example, this question discusses the calculations for a Mercator projection. And again, how you draw something on a given map at those coordinates depends very much on the map you're using.įor larger distances, the curvature of the Earth becomes important and the map projection you're working with will make a big difference in how those coordinates are calculated. For example, the coordinates you've given in your example are literally only feet apart - don't bother with complicated calculations. In general, the question is: how far apart are your coordinates likely to be?įor small distances, up to a few miles or kilometers, you're probably just fine treating the lat/lon as x/y coordinates. If that's the case, then your calculations are going to be closely tied to the map you're using. You haven't mentioned what you're doing with this information - the mention of "frames" makes me think of animation or a game involving moving things on a map. Let posY = earthRadius * s(latRad) * Math.sin(lonRad) ĭo you know a better formula for this? Thank you very much.Īny conversion you do will introduce error, since you're trying to map the surface of a sphere to rectangular coordinates. Convert degrees in decimal form such as GPS coordinates in latitude and longitude to degrees, minutes and seconds ( DMS ). ![]() ![]() Let posX = earthRadius * s(latRad) * s(lonRad) ![]() I've tried the following but it doesn't work: function convertSphericalToCartesian(latitude, longitude) Par conséquent, décline toute responsabilité quant à la précision et l'usage fait des résultats obtenus.I am doing a Javascript application that requires the movement of a certain element in a real world map, in frames.įor each frame, i have the following positions in latitude and longitude for the element, for example for frame 0:įrame (Frame 0) needs to be point (0,0) and I want the following ones to be converted to XY Coordinates as well.īasically, I need a Javascript script that receives the latitude and longitude of a frame and returns the position (x,y) for that frame (in relation to frame 0 with position (0,0)). Il est fortement recommandé que l’utilisateur dispose préalablementĭe quelques points de contrôle dont les coordonnées sont connues dans les systèmes de coordonnées à utiliser pour les comparer avec les coordonnées obtenus par l’application.ĭ’ailleurs, cette remarque s’applique à tous les logiciels de conversion de coordonnées. L’utilisateur doit s’assurer que les résultats correspondent bien à ses attentes. Le choix du réseau géodésique, l’actualisation des paramètres des Datums, etc… Ainsi, avant d’adopter définitivement les résultats donnés par l’application, Remarque importante concernant la précision et l’exactitude des résultats obtenusĭifférents facteurs limitent la précision des transformations notamment les spécificités pratiques de chaque pays ou territoire, la propagation des erreurs, The input of the longitude is a decimal number between. To convert the angle unit of geographical coordinates Latitude-longitude (degree, minute seconds (dms), grad, radians), just use If the degree of latitude is given in S as south, the number should be preceded by a minus sign.For GPS coordinates, select the WGS84 system for example, to convert coordinates GPS in UTM Zone 10N coordinates, choose left WGS84 and UTM Zone 10N right.(Other datums and projections will be added following the request of the visitors). X, Y, Z -> Long, Lat, h: Select left WGS84_XYZ (geocentric) and right: WGS84.Ī coordinate converter allows performing conversion between different geodetic systems and most used projections, for example, converting GPS coordinates (WGS84) to Lambert, UTM, Mercator, RGF93, NAD83, NAD27. For a MapPoint, I get its X/Y coordinate values. If you don't have it in ArcMap use the X,Y to create the features and then do the above. Long, Lat, h -> X, Y, Z: Select WGS84 left and right: WGS84_XYZ (geocentric) under 'International' menu 1 Solution by RobertBorchert 04-12-2013 12:03 PM IF you already have it in ArcMap simply create a new x,y fields (lat long) and use the right click on one of the new columns and select Calculate Geometry. ![]() New !: Geocentric cartesian coordinates (X, Y, Z)įollowing a request from a visitor, I added the option to convert to and from Geocentric cartesian coordinates (X, Y, Z). IF you already have it in ArcMap simply create a new x,y fields (lat long) and use the right click on one of the new columns and select Calculate Geometry. ![]()
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