I'm experiencing weird behavior when using the "Layer to KML" geoprocessing tool in ArcGIS Pro 2.0.1. The scenario is as follows:
I created a group layer (States) with 4 child layers corresponding to regions of the country (Northeast, South, Midwest, West). These region-specific child layers depict a different subset of content (polygons) from a shapefile of all the states -- I'm using definition queries on each child layer to control which features are drawn in which layer (my definition query is based on a field named "region"). The child layers use a Unique Values symbology, with colors based on the same field as the definition query ("region"). So, the Northeast states are one color, the Midwest states are all a different color, and so on. When I export the group layer to KML and view in Google Earth, all the states (across all the regions) are the same color. This isn't what was intended.
It appears that the KML file created by ArcGIS Pro has placemarks that all reference a style called "PolyStyle00". But, towards the bottom of the KML file, I see that "PolyStyle00" has been defined / redefined multiple times, with different fill colors. I think what needs to be happening here is that the KML file should have a few different styleUrls, such as "PolyStyle00", "PolyStyle01", etc, and the placemarks in each region should be referring to the appropriate styleUrl.
I think this is probably just an ArcGIS Pro bug, but if anyone can confirm, that would be great. Thanks.
similar issue reported here... I don't know if the comment resolved it, but it looks like a similar situation
I took a look at that thread; I'm not sure if it's the same issue -- looks like their concern was about how to control the placemark name in the output KML file. In my case I'm actually totally happy with the placemark names, but it's the fill color that didn't work out for me. The workaround may just be to abandon the whole group layer / child layer organizational system, but I do really like the way that group layers can drive the creation of subfolders in the output KML file.
This occurs in 10.5 as well. Sometimes the colors of the symbols are incorrect. I restart ArcMap and perform the proper steps for KML creation and it works most of the time. It is aggravating.
Have you found a solution for this yet? If not, I have a less convenient workaround. I run into this issue often, so what I have been doing is splitting the layer into multiple layers in Pro, then running layer to kml for each layer. This will keep the desired symbology. You can then open each individual KMZ in GE, then put all layers in new folder and save as new kmz.