Loading layer with different SpatialReference of Map

HanochS — Tue, 01 Mar 2022 07:25:35 GMT

Hi,

I am trying to load a layer that has different SpatialReference of mapview. I know I need to project it to the new coordinates but i would expect getting an error when trying to add the layer to the map but that is not the case, i get nothing instead and i can't know that the layer couldn't add.

I added a code the reproduce the issue, you will see that view.when and view.whenLayerView are not being called but also their errorCallback/exception handling do not execute.

Is there any way to know that a layer view or a view failed to create?

<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>
MapImageLayer - Wrong spatialReference
</title>

layer.when(() => {
console.log('layer loaded')
},
() => {
console.log('failed to load layer')

});

/*****************************************************************
*layer was loaded but this is not getting called and no error callback
*****************************************************************/
view.when(() => {
console.log('view is ready')
}, ()=> {
console.log('view error')
});

/*****************************************************************
* layer view is not created here and we do not get any error
*****************************************************************/
view.whenLayerView(layer)
.then(function (layerView) {
console.log('layer view created')
})
.catch(function (error) {
console.log('creating layer view failed')
});

});
</script>

#viewDiv {
position: absolute;
right: 0;
left: 0;
top: 0;
bottom: 60px;
}
</style>
</head>

Re: Loading layer with different SpatialReference of Map

UndralBatsukh — Tue, 01 Mar 2022 17:01:21 GMT

Hi there,

Nothing is being displayed because your map does not have a basemap where it can derive view.scale and view.constraints.lods from. The view.zoom levels are as convenient numbers used as a shorthand for predetermined scale values. Scale values are derived from your basemaps.

If you want to display your layer without a basemap, then you need to set the scale and center of your view.

const view = new MapView({ container: "viewDiv", map: map, spatialReference: { wkid: 102100 }, scale: 36978595.474472, center: [-100, 35] });

You may find this document useful as it describes about zoom levels and scales.

Re: Loading layer with different SpatialReference of Map

HanochS — Wed, 02 Mar 2022 08:23:42 GMT

Hi,

Thanks for the reply. I will check the suggested solution. but still, why there is no error when trying to do that kind of thing? what is the error callback/error handling is for?

Re: Loading layer with different SpatialReference of Map

UndralBatsukh — Thu, 03 Mar 2022 18:48:45 GMT

Hi there,

We do not throw an error in this case. We can log error when this happens but I am not sure when it will happen. In any case, we will document this behavior clearly in the MapView doc so that it will help to troubleshoot this.

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