By default, there is a 30-minute cache delay in displaying updates to the KML layer.Image overlays that cover large areas may appear distorted.Ground overlays and network links without refresh properties do not print.The following elements do not display in a map: regionated KML, view-based and time-based refresh parameters, regions inside network links, and screen overlays.The current limitations of using KML layers in Map Viewer are as follows: KMZ (compressed KML, including attached images).Styles of polylines and polygons, including color, fill, and opacity.Network links to import data dynamically.The following list will expand as Esri continues to develop support for KML: Map Viewer supports a subset of KML elements and functionality. There are some aspects of KML that do not work well on 2D screens and some limitations to what web browser clients can support. KML is now supported in a number of two-dimensional web browser clients, including Map Viewer. KML was originally created to view features in three-dimensional Earth browsers such as ArcGIS Earth. If you know a specific KML document on the web that you want to display on your map, you can add it as a layer on the web. When others discover your KML, they can choose to open it in Map Viewer or download the file to their computer. Once you've added your KML, you can share it with groups you belong to or make it public by sharing with everybody. You can also add the KML by referencing the URL of a. kmz file on the website through the Add Item button on the My Content tab of the content page. Many KML client applications, including Map Viewer, are free and provide a familiar, user-friendly browsing experience. Using KML, you can also designate text, pictures, movies, or links to other GIS services that appear when the user clicks the feature. KML allows you to draw points, lines, and polygons on maps and globes and share them with others. KML is an XML-based file format used to represent geographic features in applications such as ArcGIS Earth and Google Earth. Considerations for using KML in your map.
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