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How to overlay a png type picture on a 2D map

Lzy

Hello，

I had some problems when trying to overlay an image on the map using x-max, x-min, y-max, y-min, I tried to use AGSImageOverlay class to achieve this function, but found that the image could not be zoomed in and out as the map zoomed. Later I tried to implement it using AGSKMLLayer class, it worked, but AGSKMLLayer was loaded on map.operationalLayers and I couldn't change the order in which it was stacked with other layers.

Is there a better way to do this?

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Ting

> will the subsequent version implement this layer

This feature is currently a user priority on our board, so hopefully it will be implemented soon.

> when will the iOS SDK version be updated

When this feature is implemented (potentially in the format of supporting 2D ImageOverlay), it will be in our new 200.x version of ArcGIS Maps SDK for Swift. Stay tuned and keep an eye on this channel: https://community.esri.com/t5/swift-maps-sdk-questions/bd-p/swift-maps-sdk-questions

Internal Ref: release-plan # 940

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Ting

Unfortunately, AGSImageOverlay and AGSImageFrame currently only work on an AGSSceneView. If a 3D scene fits your usecase, I would recommend try that out.

Using AGSKMLGroundOverlay is an option. You should be able to change the order of the AGSKMLLayer's by changing their order in the map's operational layers. Can you share a repro in case you cannot change the order?

Another hacky option would be using AGSPictureMarkerSymbol. You can create a symbol with an image, then honor the reference scale on the map by setting scaleSymbols to true. However, that means all the images (symbols) you add can only be at the same scale, and some calculation on their positions is needed.

Finally, if it suits your usecase, you can also consider using AGSRasterLayer or AGSWMSLayer. A raster file typically comes with a georeference, and common formats such as GeoTIFF or raster datasets in JPG/PNG formats would probably fit your needs. WMS server can deliver image files similar to ArcGISMapImageLayer.

Back in 10.x we used to support AGSDynamicLayer, see this discussion. However that was dropped in 100.x Runtime SDK. I'll query our team to see if other ways are available.

Attached is a demo project that you can play with. Hope it helps. 🙂

Demo App ImageOverlay.zip

Lzy

Thank you very much for your answer.

I tried but it doesn't seem to solve my problem, can I change the overlay order between KML and Graphic layers?

Ting

Unfortunately, we don't have a way to interweave the z orders of operational layers and (the graphics in the) graphics overlays, as they are 2 different kinds of "layers" (graphics overlays are for overlaying graphics on top of a map view, whereas the operational layers can be a variety of things - raster, tiles, features, map image, annotation, etc.).

Lzy

Thank you very much for your answer.

Will later versions add classes of overlay images? What I need now is that I need to overlay one more image on top of a GraphicOverlay graph, and the size of the image can scale as the graph scales. The graphic is a rectangle. I tried the suggestion you gave to use AGSPictureMarkerSymbol, but I don't know how to solve the scaling problem. If so, can you give me some advice on how to calculate the scaling factor?

Thank you so much!

Ting

Another update: ArcGIS Online released the Media Layer this week so it shouldn't be long till we get it into the Maps SDK.

Lzy

That's awesome! Will there be media layers when 200.x ArcGIS Maps SDK for Swift is released in early April?

Ting

I haven't heard any update on that yet, but I'll try my best to keep you posted! 🙂

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