희망은 잠들지 않는 꿈

저는 kpop을 진짜 좋다. 제일 좋아하는 가수가 슈퍼주니어의 막내 규현인다.^^ 규현이 노래가 진짜 잘 불러요. 이게 제 제일 좋아하는 노래 입니다~~ 규현이 목소리의 특색이 아주 좋아요ㅠㅠ

첫번째 블로그!

안녕하세요~^^
저는 진이라고 합니다. 저는 대만에서 태어나서 자랐습니다. 10년전에 미국에 왔다. 만나서 반갑습니다!

Lab 8: Census 2000/2010

The first two maps show the population distribution of African Americans in the United States according to the 2000 U.S. Census. From the two maps, it is apparent that the Black population is concentrated in the southeast region of the United States, with some counties that have as much as 86% of African Americans. This data makes sense considering the history of the South, but the maps also show that migration has taken place with people moving to northern parts of the United States.

The next two maps show the population distribution of Asians in the United States with data taken from the 2000 U.S. Census. The maps have a less apparent trend but they show that Asians are mostly populated on the West Coast, especially in major cities in California with the highest percentage being 46%. This is understandable because the West Coast is the closest to Asian countries, and many have decided to stay there once they come to America.

 

The last two maps were created using data from the 2000 U.S. Census and they show the population distribution of "Some Other Race" ranked by percent. The maps show that people identified as "Some Other Race" are mostly populated in the southwest regions of the United States, with the highest percentage being 39%. I would suspect that they are Latin Americans due to the fact that Mexico is the neighboring country.

I have learnt a lot about what GIS is and how useful and applicable it is to analyze and solve real-life problems. Even though this is a very interesting subject, it is very challenging and my experiences with GIS were not always pleasant. There were lots of times when I got really frustrated with saving data at different places and having to redo the whole thing, but overall I enjoyed the class.

Lab 7: Mapping the Station Fire in ArcGIS

The Station Fire in Los Angeles County started on August 26, 2009 and was fully contained on October 16, 2009 at at 7:00 p.m. The fire burned approximately 160,577 acres of land and destroyed 209 structures, including 89 homes. It was the largest fire in Los Angeles County and the tenth largest fire in California since 1933. The fire started in the Angeles National Forest and severely affected the cities around it.
The first map shows the perimeters of the Station Fire from August 29, 2009 to September 2, 2009 at many different times. The second map only shows the perimeters of the fire on August 29, 2009 at 2:48 a.m. and September 2, 2009 at 7:02 a.m. It can be inferred from the second map that fire tends to go up the slope by looking at the elevation changes. The fire went from the red perimeter upwards toward the purple mountain and its final position is depicted by the orange perimeter.

The Station Fire affected many of its surrounding cities which included La Cañada Flintridge, Glendale, Acton, La Crescenta, Littlerock, Altadena, Sunland, and Tujunga (Wikipedia). None of these cities are actually within the perimeters of the fire according to my second map, which shows how destructive the fire was as it could affect its surrounding cities as well. Many people in these cities were forced to evacuate and there were a lot of people in other cities that were affected by the smoke and the ashes in the air.
The theme of my map is the effects of the Station Fire on potential cities. Condor Peak is the only place that is fully within the perimeters of the fire, so I hypothesize that it would receive the most damage by the fire. The cities in the San Gabriel Valley below the fire would experience aftermath of the fire such as bad air quality caused by the smoke and ashes.

This week's lab is really interesting because I remember seeing the fire in the mountains from my home back in Arcadia, but I had never really thought about how the fire moved or how it affected its surroundings back then. I think it is incredible that ArcGIS can be used to analyze patterns and provide explanations for situations that happen in real life.

Works Cited

"2009 California wildfires." Wikipedia, the free encyclopedia. 2009. Web. 23 Nov. 2010.

Archibold, Randal C. "After a Devastating Fire, an Intense Study of Its Effects." New York Times. 2 Oct. 2009. Web. 23 Nov. 2010. 

"How Did the Station Fire Start." Slate. 3 Sep. 2009. Web. 23 Nov. 2010.

"State of the Climate Wildfires Annual 2009." U.S. Department of Commerce. 8 Jan. 2010. Web. 23 Nov. 2010.

"Station Fire." Incident Information Web. 10 Nov. 2009. Web. 23 Nov. 2010.

Lab 6: DEMs in ArcGIS

 

I chose to do this lab assignment on Grand Canyon because it is a famous attraction located in Arizona. It is a steep canyon carved by the Colorado River and known for its dramatic elevation changes. The geographic coordinate system used is the North American Datum of 1983. The extent information (in decimal degrees) of my original DEM is:

Top: 36.3608333326

Left: -112.540277777

Right: -111.69361111

Bottom: 35.9647222214

Lab 5: Projections in ArcGIS

 

Getting Started Questions:
How many degrees does the equator span?
360 decimal degrees
How many degrees do the northern- and southern-most graticule lines span?
180 decimal degrees

What do these two lines in fact represent?
These two lines represent the total distance in decimal degrees around the Earth latitudinally and longitudinally.

Approximately how many miles separate Washington, D.C. and
Afghanistan when crossing the Atlantic?
6,913.151 miles

Mercator Projection: 
Is Alaska really bigger than Brazil?

Yes

What about Greenland?

Yes

How far is Washington, D.C. from Kabul now?

10,110.689 miles 

Map projection is essential in creating maps as it allows a better understanding of the three-dimensional world by representing it on a two-dimensional surface. It also provides a more transportable model as well. Cylinders, cones, and planes are all used to create map projections. Map projections are constructed to preserve one or more of the map regions properties including area, shape, direction, bearing, distance, and scale. Different map projections exist depending on the purpose but no map can perfectly represent the surface of the entire Earth.

Equal area projections such as the Bonne projection and the Sinusoidal projection preserve area. They keep the areas on the Earth and their corresponding areas on the equal area map proportional. In other words, given any two regions A and B on the Earth and their corresponding regions A' and B' on the map, the surface ratios of A to A' and B to B' are the same.

Equidistant projections preserve distance from some standard point or line. These include the equidistant cylindrical projection and the equidistant conic projection. They maintain equal distances from the center of the projection to any other place on the map in all directions, but area is distorted as a result.

In conformal projections such as the Mercator projection and the Gall Stereographic projection, angles are preserved locally. The Mercator projection is the most widely-used conformal projection. It is a cylindrical map projection and is used for nautical purposes because of its ability to represent rhumb lines as straight segments. It is good for preserving the angles and the shapes of small objects, but it distorts the size and shape of large objects as the scale increases from the equator to the poles.

Map projection is the method of taking the surface of a sphere or other shapes and representing it on a plane. Inevitably, distortions occur during the transformation of a 3-D model to a 2-D surface and some information is lost in this process. Despite these perils, map projection is significant in creating maps and its variablility allows the user to choose and construct the best-possible representation of the desired model depending on the situation.

Lab 4: Introducing ArcMap

This week's lab was a lot more difficult than last week's lab exercise. While Googlemap was relatively straightforward and easy to understand, GIS was really difficult and confusing for me even with the tutorial.This further reinforces the point that neogeography is for amateurs while GIS is for professionals. Even though it is quite complicated to use, GIS has proven to be an effective and helpful mapping tool.

A problem I encountered while doing the lab was saving the data onto different computers, so when I opened my completed project on another computer some of the data and the graph were no longer present. I ended up having to redo the whole thing several times to finally get it right. Another problem I had was not being able to undo some of the things such as color changes and had to change it back manually.

GIS has great potential in helping users understand the spatial relationship between a place and its attributes through the use of maps. It lets users incorporate graphs and maps together to better understand and solve real-world situations. For example, the map for this lab exercise is used to help people understand the relationship between the airport noise and its surrounding population so that measures can be taken to solve this problem. GIS is extremely helpful in mapping out data, visualizing the relationship between data, and analyzing the data.

Despite its potentials, GIS contains certain pitfalls as well. First of all, GIS is not user-friendly for first-time users. A lot of steps have to be taken to perform a simple operation. The program can be very confusing for amateurs unless they go through the tutorial several times. Another downside of GIS is that it is not easily accessible by the public since the program is quite expensive. Therefore, GIS is mostly utilized by professionals and the government to understand real-life problems and develop ways to solve them.