On first glance you will quickly note many different colors associated with these files. I have adopted this arrangement based on the following premise:
BLUE: ENGINES/PUMPERS (QUINTS*) Water is blue.
RED: LADDERS/TRUCKS (QUINTS*) FDNY Truck Helmet Shields
ORANGE: HEAVY RESCUE/USAR Just because.
PURPLE: HAZMAT Purple K for metal fires
LIGHT BLUE: TANKERS/TENDERS Again, water is blue.
BROWN: BRUSH/GRASS RIGS Wood is brown.
PINK: MARINE/BOATS A good contrasting color.
WHITE: SPECIAL UNITS (UTILITY, ETC.) Again just because.
GREEN: AMBULANCE/ALS RESCUE EMS Oxygen is in green tanks.
WHITE STARS: SAFETY OFFICERS Once again, just because.
GREEN STARS: EMS SUPERVISORS** See green above.
GOLD STARS: OPS CHIEFS** Think top "brass".
* Quints; a versatile piece of equipment yet very difficult to pigeonhole for this purpose. Is it an engine, making it a blue label or a truck thus red as the marker of choice?
** Two different size stars are used to make a distinction between battalion/district chiefs and deputy/division chiefs. The smaller one represents the lesser whereas the larger the more senior chief.
Additionally some files have no color coding. This is due to insufficient information regarding unit assignment. However, they are shown as red squares with a number to represent the station. Furthermore there will be some files without numbers. In this instance the station numbering system is unknown or not clearly indicated on the respective website. Nevertheless a particular town or community is known. Clicking on the square will normally produce a pop up window detailing that information.
Also know there are a few files which are incomplete. Though not many, there are some as this is a work in progress.
NOTE TO TABLET/MOBILE DEVICE USERS: At this time apparently these files will not open directly into GOOGLE EARTH on mobile devices. What works for me on my Nexus 7 is to send an email through Gmail to myself with a file as an attachment. From there I open that email on my tablets's Gmail then save the file in a folder I created expressly for them. From that folder I can open a file into the GOOGLE Earth app. You would need to save the file(s) you require to your PC first.