00:01Well, next, let's continue on with another 3D story. This one from Washington, DC, and Virginia.

00:07So please welcome another student from Washington Lee High School, Mary O'Conner.

00:18Thanks, John. I got inspiration for my final project from looking outside my classroom window where I could see the tall...

00:25...densely set buildings surrounding the metro station. I became interested in seeing how metro stations affect development.

00:32To start, I wanted to see how the population is changing in the DC metro area.

00:38This map shows that the highest population change is occurring in the northwestern suburbs...

00:43...which is where metro is adding 11 stations on a new metro line.

00:48I then wanted to see how the area around the new metro line could change once the stations are finished.

00:54I downloaded a land usage file and created a color ramp from red to green...

00:59...where red shows development and green shows less development.

01:03The areas with the most development are mainly clustered around the metro stations.

01:10Next, I used ArcScene to extrude census tracts while draping half-mile metro buffers of the areas...

01:17...of the new metro stations--this, which allowed me to examine populations and population change using a 3D model.

01:26The population density has increased a little bit but is still nowhere near the population density of the existing metro stations.

01:34We can expect the area around the new metro line to develop and to, over time...

01:39...have population density similar to existing metro stations.

01:44Last, I wanted to examine the relationship of impervious surfaces and metro stations...

01:51...because I learned in my environmental science class that an increase in impervious surfaces...

01:56...has negative consequences on the environment.

02:00I downloaded a raster file of the impervious surfaces from the USGS Seamless Viewer.

02:06I then reclassified the impervious surfaces and used Geospatial Analyst, where I discovered 59 percent of the areas...

02:14...within a half-mile buffer of the existing metro stations were impervious surfaces.

02:20During my GIS class at Washington Lee, I chose this project based on local issues.

02:26Through problem-based learning, I was able to see how GIS plays an important role in analyzing our environment...

02:33...and making decisions for future development. Thank you.

02:42Thanks, Mary. When I first saw Mary's project, it kind of brought me back to when I was first driving through...

02:49...Washington, DC, and Virginia, and I would see all these little pockets of high residential buildings...

02:55...and I would stop and wonder why they were there. Well, to be honest, I didn't wonder that. I just kept driving.

02:59I never even stopped to think about what was causing those patterns...

03:03...and then you see somebody like Mary explaining it and showing it to us. I think it is truly an amazing inspiration.