Mapper.ofdoom help

Basic Information

The first thing you see in the top left corner of the page, and taking up most of the screen, is the active map. Click on it to recenter the view. A red cross-hairs will mark the location at which you last clicked.
There are controls for changing the type of view, zooming in and out, and adding data to the view located to the right and bottom of the page.

Left side controls


The overlays menu allows you to overlay data from different sources on your map. Depending on the type of data, it might appear as small colored dots (which may respond when clicked, or when the mouse passes over them), or as small icons.


The dnsloc option displays the location of Internet sites that have added a DNS location record to their DNS information. Sites can be added to the database, and the database can be queried at


The geourl option displays the location of web sites that have registered their location with Clicking on a geourl dot will open the web page associated with that location. Using this option may cause some slowdowns, as data will have to be fetched from the geourl server if it has not been cached on the map server.

geocrawler is my attempt at building a system to track the locations of tagged webpages. I started it while was down, and see no reason to stop running it.

In some places has better coverage, in some places has better coverage. Try turning on both for the best results.


ctwphc displays the locations of photos from the Clinton Township Historical Commission webpage. All of the pictures are also in the geocrawler dataset, and this option is used to provide a filtered view for links from the Commission's webpage.


The landmarks option overlays a selection of the 2 million notable locations collected by the USGS GNIS project. These include schools, churches, mines, postoffices, towns, and just about everything else that can be named. If this option is selected, another control will appear to let you select which categories you want to display.

In addition, the landmark option contains a list of National Geodetic Survey Benchmarks. Banchmarks are small markers, with their location stamped into them. They're all over the place, and are used as the base points for surveying. Some people like looking for them, and they can be useful for testing how accurate your GPS is. Benchmark points are linked to pages with more infomation on that specific mark.


These markers tell you the name of the street they are marking. Move your mouse over them to see the name. They are based on the Tiger 2004 dataset.


This database consists of the active and archived site lists from the EPA's CERCLIS database. It's mostly complete, although I had to leave out a few thousand records which my geocoder had trouble parsing.

Note that just because a site shows up, this does not indicate it is a danger. Most of the sites are from the archived database, and whatever happened at that location has been completely cleaned up. Each point links to the record for that site.

There are two slightly different icons used for superfund sites. Active Sites: Inactive Sites: .


This option draws an overlay of the vector data from the Tiger-2004 dataset.
Currently roads are marked in white, railroads in green, and powerlines / other infrastructure in red.


There are seven options for the format of the map: Photo, Topo, Photo+Topo, Metro, Photo+Metro, Metro+Topo, and Photo+Metro+Topo.
For most locations, only the first three will be available. At some zoom levels, only one or two options may be available.









Photo displays photographs from the USGS (obtained via terraserver-usa).


Topo displays USGS topographic maps (obtained via terraserver-usa).


For some highly populated areas, the USGS has taken an additional set of higher resolution, color photographs. If they are available, the Metro option will select them. (obtained via terraserver-usa)

Composite types

With the remaining options, the different tiles are combined before they are displayed. Blended tiles are cached on the web server, but if you enter an area which has not been visited, things may slow down as the blended map tiles are generated.


Click the + for a larger view, click the - for a smaller view. This does not change the scale, just the size of the view.

Bottom controls


This control shows you the location of the point you most recently clicked.
If you want to go to a specific location, enter it here and press go.

zip code

This control displays a guess of the zip code containing the point on which you last clicked.
To jump to a view of a specific zip code, enter it, and press the button.


Scale controls the number of Meters per Pixel of the current view. Different formats have different restrictions on the scale.

Address Lookup

This tool is rather picky, and can sometimes be inaccurate, but it can be very useful. Enter a street address to view that location. It is very picky about street types (Ave, Drv, Ct, etc...) and won't find a street if the type is wrong. I suggest using it with just the street and zip code for the best results.

Sometimes it can be off by a bit, but it is usually accurate within a block or so.

The database it is using is based on the Tiger 2004-fe dataset.
The geo-locating engine is based off of Dan Engor's geo-locator.

Street Lookup

This tool looks up locations based solely on a street name. You will probably have to hunt through the resulting list to find the one you want, but it can be interesting to see how many streets exist with the name you are looking for, or have some specific name ( Try using your last name ).

Place Lookup

The catchall. If it has a name, try entering it, and see what you get.