See instructions below. (You might need to download the
java 1.2 plugin.)
Instructions
The current position of query point change as you move your mouse in
the window.
Your can change the position precisely by input in the x and y
textfileds and click "Enter" button to query.
The current position of query point is shown in the x and y field. The
trapezoid including the query point is filled with yellow.
You can zoom in and out of the viewing window by clicking the "Zoom
In" and "Zoom Out" buttons.
You can pan by dragging the mouse inside the viewing window.
During the transfer of map data, you can give priority to any map
location in the viewing window by clicking on it.
Because of the large dataset, your applet may run out of memory. You
can
download
the java application directly and run it in your own machine, and the
speed will be considerably increased if your machine has more memory for
the application. Run the downloaded program using (Java 1.2 platform
required) java -jar Demo.jar
The Data
The data is the
United States Census Bureau's
TIGER (Topologically Integrated Geographic Encoding and Referencing)
data. The display of this map appears somewhat unfamiliar (if you
know the normal Manhattan map) because we do not perform any
projection of the latitude/longitude coordinates to a flat plane.