Hello,
Is it possible to convert the x an y coords from webmercator to lambert_72 (31370)?
Kind regards,
Serge
You should not use toFixed! You should just pass in the actual values to get the correct results.
longitude<SPAN class="punctuation token">:</SPAN> pt<SPAN class="punctuation token">.</SPAN>latitude<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toFixed</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">5</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> latitude<SPAN class="punctuation token">:</SPAN> pt<SPAN class="punctuation token">.</SPAN>longitude<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toFixed</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">5</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN></SPAN><SPAN></SPAN></SPAN>
sigh...Correct. Thanks Undral..now it works like a charm..
I used the .toFixed with a copy/paste of the sample code but read over it.
Thank you for the link Dan. I am trying to comprehend it
I have made a small sample which shows me the current coords in WGS84 format (lon/lat). I want them to show me the Lambert_72 coords but I get it to work.
On every move of the mouse I do this
var outSpatialReference = new SpatialReference({ wkid: 31370 //lambert }); var wgsPoints = new Point({ longitude: pt.latitude.toFixed(5), latitude: pt.longitude.toFixed(5) }) var projectedPoints = projection.project(wgsPoints, outSpatialReference);
I create an outSpatialReference where I use the wkid for lambert. Then I get the point where the mousecursor is and put it in the projection with the function .project() --> Projects a geometry or an array of geometries to the specified output spatial reference.
However I am not really sure about the result being correct since I get coords that don't seem te be correct.
Could anyone see if the code is correct or if I am missing something?
<html><head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> <title>ArcGIS JavaScript Tutorials: Select a basemap</title> <style> html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; } </style> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script> <link rel="stylesheet" href="https://js.arcgis.com/4.12/esri/css/main.css"> <script src="https://js.arcgis.com/4.11/"></script>
<script>
require([ "esri/Map", "esri/request", "esri/views/MapView", "esri/layers/WMSLayer", "esri/Graphic", "esri/geometry/Polygon", "esri/symbols/SimpleFillSymbol", "esri/WebMap", "esri/geometry/projection", "esri/geometry/SpatialReference", "esri/geometry/Extent", "esri/geometry/Point" ], function (Map, esriRequest, MapView, WMSLayer, Graphic, Polygon, SimpleFillSymbol, WebMap, projection, SpatialReference, Extent, Point) {
layer = new WMSLayer({ url: 'https://geoservices.informatievlaanderen.be/raadpleegdiensten/GRB-basiskaart/wms?' });
var url = "http://loc.geopunt.be/v2/location?"
var map = new Map({ basemap: "topo-vector" //Dit is je basismap om in te lezen, });
map.add(layer); //Hier is de WMS layer die je erop "plakt"
var view = new MapView({ container: "viewDiv", map: map, center: [4.474, 51.023], //lon, lat zoom: 20, });
const cs1 = new SpatialReference({ wkid: 4272 //PE_GCS_ED_1950 }); const cs2 = new SpatialReference({ wkid: 4167 });
const extent = new Extent({ xmin: -186.0, ymin: -42.0, xmax: -179.0, ymax: -38.0 }); projection.load().then(function (evt) { //const geogtrans = projection.getTransformations(cs1, cs2, extent); //geogtrans.forEach(function (geogtran, index) { // geogtran.steps.forEach(function (step, index) { // console.log("step wkid: ", step.wkid); // }); //}); });
var coordsWidget = document.createElement("div"); coordsWidget.id = "coordsWidget"; coordsWidget.className = "esri-widget esri-component"; coordsWidget.style.padding = "7px 15px 5px"; coordsWidget.style.width = "500px";
view.ui.add(coordsWidget, "bottom-right");
//*** Update lat, lon, zoom and scale ***// function showCoordinates(pt) {
var outSpatialReferenceWebMercator = new SpatialReference({ "wkid": 3857}); var outSpatialReferenceLambert = new SpatialReference({ "wkid": 31370 });
var wgsPoints = new Point({ longitude: pt.latitude.toFixed(5), latitude: pt.longitude.toFixed(5) }) var projected3857 = []; var projected31370 = []; projected3857 = projection.project(wgsPoints, outSpatialReferenceWebMercator); projected31370 = projection.project(wgsPoints, outSpatialReferenceLambert);
var coords = "Lat/Lon: " + pt.latitude.toFixed(5) + " " + pt.longitude.toFixed(5) + "</br> WebMercator: " + projected3857.x + " " + projected3857.y + "</br> Lambert: " + projected31370.x + " " + projected31370.y + "</br> Scale 1:" + Math.round(view.scale * 1) / 1 + " | Zoom " + view.zoom; coordsWidget.innerHTML = coords; }
view.watch("stationary", function (isStationary) { showCoordinates(view.center); });
view.on("pointer-move", function (evt) { showCoordinates(view.toMap({ x: evt.x, y: evt.y })); });
}); </script></head><body> <div id="viewDiv"></div></body></html>
Kind regards
In your related link Todd recommended 'Projection'
https://community.esri.com/thread/241705-polygon-drawing-with-lambert72-values-doent-match#comment-883993
To go from one coordinate system to another
projection | ArcGIS API for JavaScript 4.13
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