topic Re: KML imagery is vertically squished with certain Basemaps in Qt Maps SDK Questions

KML imagery is vertically squished with certain Basemaps

KennSebesta — Sat, 16 Oct 2021 21:04:06 GMT

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?

Re: KML imagery is vertically squished with certain Basemaps

DanPatterson — Sat, 16 Oct 2021 20:08:21 GMT

The basemaps look different to me. What was their coordinate systems

Re: KML imagery is vertically squished with certain Basemaps

JayantaPoddar — Sun, 17 Oct 2021 05:17:34 GMT

Could you check if you can alternatively use

Enums.BasemapStyleArcGISTopographic

More options in Enums.BasemapStyle enumeration | ArcGIS Runtime API for Qt | ArcGIS Developer

Re: KML imagery is vertically squished with certain Basemaps

LucasDanzinger — Mon, 18 Oct 2021 19:40:26 GMT

ArcGIS.Enums.BasemapTopographicVector

This is invalid and should be

Enums.BasemapStyleArcGISTopographic

What is happening is the basemap style enum was invalid so the basemap fails to load, so the map takes on the first layer's spatial reference, which is the KML in WGS84. The basemap styles are all in web mercator, so we are comparing two different spatial references, hence the different shape.

Re: KML imagery is vertically squished with certain Basemaps

KennSebesta — Tue, 19 Oct 2021 18:31:48 GMT

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.

Re: KML imagery is vertically squished with certain Basemaps

KennSebesta — Tue, 19 Oct 2021 18:19:09 GMT

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.

Re: KML imagery is vertically squished with certain Basemaps

KennSebesta — Tue, 19 Oct 2021 18:41:13 GMT

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: