Frequenty Asked Questions

What’s that security problem message when dealing with KML/XML/etc. all about?
Because of cross site scripting (XSS) attacks, web browsers won’t let the client pull certain types of information from sites with a different host than the original page. Browsers will let you pull images and JavaScript from other hosts, but they won’t let you pull what it perceives as data (KML, XML, JSON, etc.).

For API calls, we try to steer people toward using JSONP as on output format to get around this problem. You can also use a proxy from your host server to work around this issue.

Why don’t my map layers show up unless I zoom in?
Some map layers are only available at lower zoom levels because of their feature density or complexity. Essentially if they were to be visible at higher zoom levels processing and returning the request would take a long time.