About the CHARM Google Map

The CHARM map was reimplemented in Google Maps by Erik Reimers in May 2009. It bypasses KML, and instead is written directly in JavaScript with the Google Maps API. Lots of different internet sources were consulted (see below). I expect the list of sources to grow as I add more features. To work with Google Maps, a general working knowledge of JavaScript is quite helpful for writing in the API. For most (non-dynamic) uses of Google Maps, I'd recommend just going through the Google Maps page, making a KML file, storing it on their server, and linking to it from there.

• Version 1.0 - May 20, 2009 - Functional map with all information in pop-up bubbles, color-coded box markers, etc.
• Version 1.1 - May 20, 2009 - Added mouseover abbreviated data.
• Version 1.2 - May 22, 2009 - Added county lines.
• Version 1.3 - May 26, 2009 - Added cross symbol for automatic gauges, to differentiate them from manual gauges.
• Version 1.4 - May 26, 2009 - Added "This month" and "This year" links to the expanded data pop-ups.
• Version 1.5 - May 27, 2009 - Added two more decimal places of precision to gauge locations (hundredths of seconds).
• Version 2.0 - June 14, 2009 - Rewrote all map code, to work for IE/Vista. Also included a custom data pop-up bubble.

Google Maps API Sources:

• Google Maps API Tutorial by Mike Williams (BEST RESOURCE!)
• Official Google Maps API Reference
• Cartographic Boundary Files at U.S. Census Bureau
• Clickable LabeledMarker at Beginning Google Maps Applications
• Google Map Custom Marker Maker
• Google Maps GIcon imageMap Property at The Orb of Knowledge
• Custom Marker Example at Berklie

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