Latest Contributions by JamesCrandall

Trying to calculate acreage/area from polygon array loaded from JSON result of map service query and running into issue with geometries that contain "holes".  From what I know, the first list of coordinate pairs (index 0) is the "outer" polygon, then all other coordinate pairs would be the interior rings.  This is easiest enough to setup a condition to identify and calculate total area.  For example area of a polygon with two interior rings could be determined by: ring[0] area - ring[1] area - ring[2] area = total area Got it.  However, what if the polygon consists of 1 ring with interior rings and a ring coincident.  That is, there are what looks like 2 polygons coincident to each other but one of them contains holes.  How do I come up with the total area in this case?  Example below shows 2 coincident polygons, 1 with holes that needs to have the area of interior rings subtracted from the overall ring, while the coincident polygon only has 1 ring that must be added to the total area. Edit: to simplify my question, how do I arrive at the count of 2 rings (area of 1 "island" ring, area 1 outer ring - total area of 7 interior rings)    Here's the json for the rings in picture:   { "rings" : [ [ [ -8960520, 3141929 ], [ -8960482, 3141916 ], [ -8960381, 3141979 ], [ -8960297, 3142183 ], [ -8960220, 3142291 ], [ -8960267, 3142363 ], [ -8959212, 3142329 ], [ -8959216, 3140075 ], [ -8960546, 3141806 ], [ -8960599, 3141897 ], [ -8960692, 3142376 ], [ -8960637, 3142374 ], [ -8960622, 3142346 ], [ -8960608, 3142230 ], [ -8960516, 3142015 ], [ -8960520, 3141929 ] ], [ [ -8960049, 3141823 ], [ -8960001, 3141812 ], [ -8959983, 3141860 ], [ -8960017, 3141990 ], [ -8960058, 3142011 ], [ -8960083, 3141987 ], [ -8960049, 3141823 ] ], [ [ -8959472, 3141918 ], [ -8959391, 3141908 ], [ -8959340, 3141951 ], [ -8959320, 3142025 ], [ -8959325, 3142112 ], [ -8959387, 3142168 ], [ -8959484, 3142163 ], [ -8959513, 3142124 ], [ -8959472, 3141918 ] ], [ [ -8959828, 3142151 ], [ -8959808, 3142211 ], [ -8959826, 3142302 ], [ -8959875, 3142344 ], [ -8959943, 3142320 ], [ -8959986, 3142228 ], [ -8959959, 3142148 ], [ -8959927, 3142120 ], [ -8959858, 3142113 ], [ -8959828, 3142151 ] ], [ [ -8959663, 3141625 ], [ -8959585, 3141438 ], [ -8959535, 3141389 ], [ -8959428, 3141379 ], [ -8959399, 3141424 ], [ -8959384, 3141551 ], [ -8959497, 3141761 ], [ -8959571, 3141760 ], [ -8959663, 3141625 ] ], [ [ -8959960, 3141599 ], [ -8960028, 3141615 ], [ -8960074, 3141591 ], [ -8960098, 3141499 ], [ -8960095, 3141436 ], [ -8960049, 3141324 ], [ -8960008, 3141263 ], [ -8959800, 3141169 ], [ -8959793, 3141018 ], [ -8959741, 3140928 ], [ -8959722, 3140834 ], [ -8959630, 3140750 ], [ -8959570, 3140741 ], [ -8959528, 3140782 ], [ -8959542, 3140877 ], [ -8959601, 3141041 ], [ -8959719, 3141213 ], [ -8959733, 3141325 ], [ -8959797, 3141385 ], [ -8959960, 3141599 ] ], [ [ -8959346, 3140751 ], [ -8959388, 3140703 ], [ -8959379, 3140596 ], [ -8959479, 3140586 ], [ -8959518, 3140560 ], [ -8959514, 3140503 ], [ -8959403, 3140475 ], [ -8959393, 3140355 ], [ -8959278, 3140327 ], [ -8959249, 3140351 ], [ -8959237, 3140406 ], [ -8959333, 3140479 ], [ -8959343, 3140579 ], [ -8959291, 3140665 ], [ -8959296, 3140732 ], [ -8959346, 3140751 ] ], [ [ -8960421.4573999997, 3141207.5951999985 ], [ -8960651.4805999994, 3140355.0742999986 ], [ -8960730.3613000009, 3140457.7377999984 ], [ -8960501.8148999996, 3141210.1849000007 ], [ -8960421.4573999997, 3141207.5951999985 ] ] ] }     ... View more

JS 3.x Before I got too far into this, wondering if anyone can point example of calculating more accurate acreage of input geometry of a web mercator aux sphere defined feature service?  I am currently determining acreage value calculations with  this function that implements esri.geometry.geodesicAreas but we see a discrepancy in values when we use ArcGIS Desktop and apply a planar projection to the same boundary. getAcreageValueFromPolygon: function (geom) { var geometryService = new GeometryService("https://utility.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"); var geographicGeometries = []; //if self intersecting, simplify using geometry service if (esri.geometry.polygonSelfIntersecting(geom)) { //if self intersecting, simplify using geometry service geometryService.simplify([geom], function (simplifiedGeometries) { dojo.forEach(simplifiedGeometries, function (simplifiedGeometry, idx) { geographicGeometries.push(esri.geometry.webMercatorToGeographic(simplifiedGeometry)); }); var areas = esri.geometry.geodesicAreas(geographicGeometries, esri.Units.ACRES); acrevalue = new Number(areas[0]); acrevalue = parseFloat(acrevalue.toPrecision(3)); }); } else { geographicGeometries.push(esri.geometry.webMercatorToGeographic(geom)); var areas = esri.geometry.geodesicAreas(geographicGeometries, esri.Units.ACRES); acrevalue = new Number(areas[0]); acrevalue = acrevalue.toPrecision(3); } return acrevalue },   I think I'm simply looking for examples of applying a State Plane projection to the input geometry and calling planarAreas() instead. ... View more

When attempting to open the Custom Label expression building dialog in the new map viewer, clicking the icon on 1 of the layers does not open it:   For other layers it does open:   Is there something specific to the layer that prohibits this dialog from opening? ... View more

WAB Developer 2.19 Launchpad Theme   Still dealing with caching of a deployed Web AppBuilder app anytime changes are made and is redeployed. THIS thread actually solved the main problem, however it only solves it if the url is navigated to from a regular browser window.  Unfortunately, the way this particular WAB app is opened (a link on another non-ESRI web application) is navigated to as a popup window.  From what I know, the developers are navigating to this WAB via window.open()   While the cached version is dealt with, I think the index.html conatains css that causes the window to look broken.   Any recommendations? ... View more