topic Re: Identify a raster layer not in geoview? in .NET Maps SDK Questions

Identify a raster layer not in geoview?

Mike_Quetel — Thu, 07 Jun 2018 16:43:06 GMT

I can't seem to find a way using the API to identify a layer that is not in a geoview. The specific use case is there is some calculation I need to perform based on a raster dem pixel value and some additional data in a polygon feature layer. I capture user click location and can easily get the intersecting polygon from the feature layer using a query, but the raster seems like I need to perform an identify to get the pixel value. The raster is NOT in the map, nor do I want it to be. I guess my questions are: If I need a pixel value from a raster... is identify the only way? If identify is the mechanism... it seems like that is only a method on a geoview. I don't see a way to identify just the raster layer even though that is a capability of the image service itself. Thanks in advance!

Re: Identify a raster layer not in geoview?

MichaelBranscomb — Fri, 08 Jun 2018 16:33:19 GMT

Hi,

Which ArcGIS Runtime .NET API(s) are you using? (UWP, WPF, Android, and/or iOS)

Cheers

Mike

Re: Identify a raster layer not in geoview?

Mike_Quetel — Fri, 08 Jun 2018 17:36:35 GMT

Hi,

I'm using 100.2.1 for WPF.

Thanks,

MQ

Re: Identify a raster layer not in geoview?

dotMorten_esri — Mon, 11 Jun 2018 15:34:11 GMT

Did you look at GetElevationAsync for the Surface class?

Surface.GetElevationAsync Method

Re: Identify a raster layer not in geoview?

Mike_Quetel — Tue, 12 Jun 2018 15:40:46 GMT

Nope, I was focused on RasterLayer since it seemed like the more generic route to getting a pixel value at an X,Y location. I'll check this out. Is there a corollary to GetElevationAsync if the raster I want to query isn't actually a DEM? Just trying to understand the API a bit better.... Thanks in advance

Re: Identify a raster layer not in geoview?

dotMorten_esri — Tue, 12 Jun 2018 17:48:53 GMT

Not at this point no,

Re: Identify a raster layer not in geoview?

Mike_Quetel — Tue, 12 Jun 2018 18:12:59 GMT

I've attached code I'm using to get the pixel value from any image service, be it a DEM or other. It's fairly quick and dirty, assumes the pixel value can be represented as a double and creates an external dependency on json.net. Perhaps it will be useful to others.