[GIS] What restrictions on KML/KMZ upload exist in Google Maps API v3

google mapskml

I am currently using the google maps api v3 to load kml files
into my web application. The file I am having trouble with
is a KML which is 274 KB big. It will not load (uncompressed the
file is about 8mb). If I take out elements from the file to shrink it,
then i does load in my web app.

But when i use *http://maps.google.com/?q=http://myapp/kml/mykml.kmz,
then the KML loads perfectly.
If someone can shed some light on this it will be greatly appreciated

Best Answer

Im not so sure on the restrictions in the API but I would imagine a file that size would render extremely slow. An option could be to import your KML file into google fusion tables and then query it using the GM API. The filesize limit is 100mb though, when importing to google fusion tables.

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[GIS] “File not found at…” error when loading KML into Google Maps

Important note on using KML & KMZ on your hosted server

Windows:

Set the MIME on the server for accessing kml/kmz for Google Earth, Google Maps & Google Maps API reads KML and KMZ files. The standard MIME type for KML files is

* application/vnd.google-earth.kml+xml

The standard MIME type for KMZ files is

* application/vnd.google-earth.kmz

For Apache, add these lines to the httpd.conf file or a .htaccess file in the same folder (if your host only allows htaccess rather than httpd.conf access):

* AddType application/vnd.google-earth.kml+xml .kml
* AddType application/vnd.google-earth.kmz .kmz

For Linux:

* AddType application/vnd.google-earth.kml+xml .kml  

* AddType application/vnd.google-earth.kmz .kmz  

  Application: opt/google-earth/googleearth

I posted this here back in 2007 http://groups.google.com/group/google-maps-api/web/more-info-kml-on-google-maps

[GIS] Complexity restrictions for Google Maps kml

Looking at the KML Reference page, that would probably be the maximum number of items that are derived from the feature class -- commonly placemark -- which act as containers for geometry and associated data.

So, assuming you don't hit the size limits, you could have up to 1000 point placemarks, or 1000 polygon placemarks, even if each polygon was made up of 1000 points.

Having said that, the page you reference defines a feature as "placemarks, polygons, lines", implying that you couldn't have a placemark that has a multigeometry object that itself contained more than 1000 geometries, but it would be fairly easy to generate a KML file that tests this. Additionally, it doesn't say what happens when the limits are reached: does it not render anything, or does it render as much as it can?

Best Answer

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[GIS] “File not found at…” error when loading KML into Google Maps

[GIS] Complexity restrictions for Google Maps kml

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