Is it possible to display the pixel value of a raster dataset in a pop-up in ArcGIS Online?

Answer

No, it is not possible to display pixel values of raster datasets in pop-ups in ArcGIS Online. Pop-up configurations are not supported in raster datasets such as hosted imagery layers or hosted tile layers.

Alternatively, publish the raster datasets as image services in ArcGIS Server, and configure the pop-ups to display the pixel values of the image service in ArcGIS Online Map Viewer.

1. In ArcGIS Server, publish the raster dataset as the image service. Refer to ArcGIS Server: Publishing image services for steps to do this.
2. In ArcGIS Online Map Viewer Classic, add the image service to the web map. Refer to ArcGIS Online: Add layers from the web for more information.
3. Display the pixel values for the image service. Refer to How To: Display the pixel values of an image service in the ArcGIS Online or Portal for ArcGIS map viewer for steps to do this.