SRTM KML Project

The SRTM KML Project will overlay a shaded relief map of the Earth based on elevation data from the Space Shuttle Radar Topography Mission (SRTM).  Data covers the entire Earth.

KML Content Created By: The SRTM KML Project
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US Amateur Radio Repeaters

Placemarks showing the location and frequency of amateur radio repeaters throughout the United States.

KML Content Created By: K5EHX Amateur Radio Repeater Mapping
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World Wide Panorama

Collection of several 1,000 placemarks to Quicktime VR panoramic photographs that are linked via placemarks in Google Earth. The photographs are sorted into various categories such as Gardens, Transportation, Water, etc. Each image must be opened in a browser window for viewing.

KML Content Created By: The World Wide Panorama
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California Groundwater Aquifers

Polygon overlay of groundwater aquifers in California. Click on a colored area to see the name of the Aquifer and Sub-Basin.

The file is about 5 megabytes so it might take a minute or two to load and may be sluggish on older computers.


KML Content
Google Earth Library

Source Data
California Department of Water Resources

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Structurally Deficient Bridges

This placemark collection contains data for approximately 70,000 bridges throughout the United States derived from the 2006 National Bridge Inventory Database. This placemark collection only contains information on bridges with a status of “Structurally Deficient”. For a better understanding of the data, I suggest reading Coding Guide for the Structure Inventory and Appraisal of the Nations Bridges. It’s a big file so give it a minute or two to load

Original Data From: National Bridge Inventory Database
KML Content Created By: GE Library
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Update 3/15/2009

The Days Are Numbered blog created another version of this collection based on the same data that has several features missing from the version I created above.  Most importantly, this version uses regions, which load more detailed data as you zoom in.  In addition, this version includes 189,000 bridges.

In addition, there is a detailed explanation of the various ratings.

Original Data From: National Bridge Inventory Database
KML Content Created By: Days Are Numbered
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Hawaii Bathymetric Map

Bathymetric map overlay of the Hawaiian Islands.


KML Content
Google Earth Library

Source Data
The Hawaii Coastal Geology Group

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Historic Topographic Maps of New England

This collection contains approximately 900 15-minute historic USGS Topographic Maps covering almost the entire states of Connecticut, Delaware, Massachusetts, Maryland, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island and Vermont.  Most of the maps are dated between 1890 and 1910.

There is a long history to these maps and how they ended up on my server and the role I played is but a very small one. My understanding of the story is that Christopher Marshall took a laptop and a scanner to various libraries and created the original scans, which consisted of 4 scans for the four corners of each map. JPGs from the original scans can be downloaded from http://historical.maptech.com/ and http://docs.unh.edu/nhtopos/nhtopos.htm. The next chapter to the story occurred a few years ago when Richard Utter took about 900 of the maps, stitched together the four pieces of each map and georeferenced them. Then finally, last week I received an email from Russell Nelson saying that he had all of Richard’s georeferenced maps on a couple DVDs and that he would be happy to send them to me. Now here we are a few days later and I have converted all of them to Google Earth SuperOverlays and uploaded them to my server. So I would like to personally thank Christopher, Richard and Russell for their contributions in making this possible.

This collection does not have all the topo maps that are available from the University of New Hampshire and Maptech websites. Richard appears to have scanned one revision of each 15′ map. Maybe someday I will find the time to add multiple revisions and the maps that are available in other scales. But that’s an enormous undertaking so probably won’t happen any time soon. Because there is only a single version of each map, I went ahead and removed the collars to create a seamless overlay for each state.

This collection has been added to my main Historical Topographic Map collection that has 1,000+ other historical topos. If you already have that Network Link in your Google Earth Places folder, then you should see the New England Maps appear automatically. If you don’t have it, simply download the KML file at the bottom of this post.  Choose a state, and then zoom down close enough for the maps to appear (the point where about 9 maps at a time will be within view). It may take a few seconds for the map tiles to load, especially when you first select PA or NY or have a slow Internet connection. An index is provided which shows the name and date of the map. If a map appears to be missing, see if it’s associated with the adjacent state. There are a few missing, especially in northern Maine.

Original Data From: http://historical.maptech.com/ and http://docs.unh.edu/nhtopos/nhtopos.htm
KML Content Created By: GE Library
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Puget Sound Bathymetric Map

Detailed bathymetric map of the southeastern part of the Puget Sound in Washington State.

For educational and personal use only. Not to be used for real world navigation.


KML Content
Google Earth Library

Source Data
Finlayson D.P. (2005) Combined bathymetry and topography of the Puget Lowland, Washington State. University of Washington

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