Want to improve this question? Update the question so it can be answered with facts and citations by.Closed 4 years ago.Our web app includes simple mapping capabilities (currently just markers and KML overlays on an embedded Google Map). This works pretty well; the only real limitation we face is KML overlays that go beyond Google's.We're considering standing up our own server (e.g. GeoServer or ArcGIS Server); but that seems like a huge step just to serve up (for example) 15 MB of KML when Google's limit is 10 MB.I need a sanity check: Is there some middle ground between Google's free and easy API for KML overlays, and setting up my own tile server? Fusion Tables service is shutting down December 3, 2019, so the option I see is to make the kml files smaller with software - QGIS desktop.

The most basic method of creating a KML file is to open Google Earth and create markers that you can save to a.KML file. In addition, you can also bring in existing data to create a.KML file. Below are some rough notes on methods of getting your GPS or GIS data into a KML file that can be used in either Google Earth or Google Maps.

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There is also qgis python library. I used QGIS desktop with the Simplify geometry option using 0.0005. Then I export the created layer as kml.

You can do this as batch job as well from the same menu. Then you can open all created layers in separate project and using the Console inside the QGIS desktop to convert all the.shp files to.kml–Nov 29 '19 at 10:38. You can break down your KML in to multiple KML's with a Parent KML referencing the smaller kmls. At least this will bring your file sizes down to a respectable level and allow you to reference much larger datasets as KML's.Honestly KML is really only good for small datasets with few features and associated attributes. I wouldn't go near it as a file data source. If you're looking at these files getting bigger, I'd look at another data type, or definitely head down the GeoServer/MapServer route for distributed datasets. If you haven't invested too much time in your Google Maps API you could switch to OpenLayers which has a client side KML parser that can read your own KML files - see example below:However for a 15MB file this would likely grind the browser to a halt.

It is probably quite slow through the Google servers too when you get near the file size limit.Is there really a need for the 15MB level of detail or could you simplify the KML without losing too much information?Do you need to access the vector/geometry on the client-side? Could this data be served as images?If neither of these is possible you will have to look at some map serving type of software. Along with GeoServer of ArcGIS Server you could consider to serve out the KML, or as a WFS. The benefit of using a mapserver is that the requests will only return the data within the map - reducing network traffic and decreasing load times.

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