KML imagery is vertically squished with certain Basemaps

Question

For whatever reason, with most basemaps the imagery from the attached KML file is vertically-- but not horizontally-- squished.

ArcGIS.Enums.BasemapTopographicVector

However, at least with `BasemapStyleArcGISImageryStandard` it works.

ArcGIS.Enums.BasemapStyleArcGISImageryStandard

Using some debug statements to look at the spatial references, I'm not seeing a difference between the two basemaps. AFAICT so far, the KML should be projected the same in both cases but very visibly is not.

Thoughts on how this can be fixed?

sec.kml.zip

xingchenc_0-1717495116394.png

KennSebesta · Answer

Using the SetMapSpatialReference sample app, and adding the KML layer, it looks like it clobbers the map's spatial reference.

import QtQuick 2.6
import Esri.ArcGISRuntime 100.11

Rectangle {
width: 800
height: 600

MapView {
anchors.fill: parent
        wrapAroundMode: Enums.WrapAroundModeDisabled

Map {
id: map
            // Specify the SpatialReference
            spatialReference: SpatialReference { wkid:54024 }

KmlLayer {
dataset:  KmlDataset {
url: "http://www.chartbundle.com/charts/kml/sec.kml"
                }
            }
        }
    }

Basemap {
id: basemap
        ArcGISMapImageLayer {
url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer"
        }
    }

Component.onCompleted: {
map.basemap = basemap;
    }
}

Without KMLLayer:

With KMLLayer:

KennSebesta · Answer

It seems like I can use all the BasemapStyleArcGISXXX maps listed at https://developers.arcgis.com/qt/qml/api-reference/enums-basemapstyle.html. Whereas everything listed in the "Inherited by" box at https://developers.arcgis.com/qt/qml/api-reference/qml-esri-arcgisruntime-basemap.html results in the wrong projection.

KennSebesta · Answer

I use

import Esri.ArcGISRuntime 100.11 as ArcGIS

so the `ArcGIS` component is correct. The BasemapTopographicVector is documented at https://developers.arcgis.com/qt/qml/api-reference/qml-esri-arcgisruntime-basemaptopographicvector.html, so I will assume that that is correct as well.

How would I align the spatial reference, either by setting the basemap's or the KML's? I've tried with something like

spatialReference: Factory.SpatialReference.createWgs84() // I've also tried Factory.SpatialReference.createWebMercator()
initBasemapStyle: Enums.BasemapStyleNone

but that doesn't seem to work. It seems like KMLLayer documentation does not mention supporting reprojection, so maybe the only way to do this is to project everything into WGS84.