https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/get-scale-for-a-box-in-js-4/m-p/1314843#M81846 <P>In JS API 3.x we could get easily the scale for a box drawn on the map after you define its 4 corners.</P><P>In the matrix for the migration from 3.x to 4.x, it states that there are no plans for the scaleUtils to be migrated.</P><P>So, what's the best option to get the scale in 4.x?</P><LI-CODE lang="javascript">var scale = esri.geometry.scaleUtils.getScaleForBox( box, map.getSpatialReference() ); </LI-CODE><P>&nbsp;</P> Wed, 02 Aug 2023 22:14:40 GMT LefterisKoumis 2023-08-02T22:14:40Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/get-scale-for-a-box-in-js-4/m-p/1314843#M81846 <P>In JS API 3.x we could get easily the scale for a box drawn on the map after you define its 4 corners.</P><P>In the matrix for the migration from 3.x to 4.x, it states that there are no plans for the scaleUtils to be migrated.</P><P>So, what's the best option to get the scale in 4.x?</P><LI-CODE lang="javascript">var scale = esri.geometry.scaleUtils.getScaleForBox( box, map.getSpatialReference() ); </LI-CODE><P>&nbsp;</P> Wed, 02 Aug 2023 22:14:40 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/get-scale-for-a-box-in-js-4/m-p/1314843#M81846 LefterisKoumis 2023-08-02T22:14:40Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/get-scale-for-a-box-in-js-4/m-p/1315772#M81867 <P>I haven't found any "getScaleForBox" function in the implementation of scaleUtils, however you can achieve the same result in 3.x via scaleUtils.getScale(map, extent, spatialReference), although the 2nd and 3rd parameters <A href="https://developers.arcgis.com/javascript/3/jsapi/esri.geometry.scaleutils-amd.html#getscale" target="_self">aren't documented</A>.</P><P>As for 4.x, the implementation of the 3.x scaleUtils is fairly simple.&nbsp; Migrating the relevant part to 4.x yields something like the following:</P><LI-CODE lang="javascript">const screenDPI = 96; function _getUnitValue(spatialReference) { if (spatialReference) { var wkid, wkt; if (typeof spatialReference == "object") { wkid = spatialReference.wkid; wkt = spatialReference.wkt; } else if (typeof spatialReference == "number") wkid = spatialReference; else if (typeof spatialReference == "string") wkt = spatialReference; if ((typeof wkid == "number") &amp;&amp; (wkid &gt;= 0)) return WKIDUnitConversion.values[WKIDUnitConversion[wkid]]; else if ((typeof wkt == "string") &amp;&amp; (wkt.search(/^PROJCS/i) !== -1)) { var a = /UNIT\[([^\]]+)\]\]$/i.exec(wkt); if ((a) &amp;&amp; (a[1])) return parseFloat(a[1].split(",")[1]); } } return 0; } function getScale(mapView, extent, spatialReference) { if ((mapView) &amp;&amp; (mapView.width)) { var scaleExtent = extent || mapView.extent; if (scaleExtent) { var srUnitValue = _getUnitValue(spatialReference || scaleExtent.spatialReference); var unitValue = ((srUnitValue) ? srUnitValue : 6370997 * Math.PI / 180); return scaleExtent.width / mapView.width * unitValue * 39.37 * screenDPI; } } return 0; }</LI-CODE><P>&nbsp;</P><P>As with 3.x, the 2nd and 3rd parameters are optional.&nbsp; Note that "WKIDUnitConversion" is&nbsp;esri/geometry/support/WKIDUnitConversion, which you'll need to include.</P> Sat, 05 Aug 2023 00:53:28 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/get-scale-for-a-box-in-js-4/m-p/1315772#M81867 JoelBennett 2023-08-05T00:53:28Z