Saturday, March 16, 2013

Final Lab - Fire Mapping

Final Lab Project - Fire Mapping






California defiantly has its far share of forest fires due to the incredibly dry climate that the state maintains. However in recent years one fire stands out specially, that is the Station Fire of 2009. CNN reported "Bone-dry conditions in an area that has not seen a major fire in more than 60 years pushed a Southern California wildfire from 45,000 acres to more than 100,000 acres in a matter of hours Monday." This unbelievable pace of spread is illustrated in first map above.The fire officially started at on August 29th, 2009 just after noon. The cause of the fire was later discovered to be arson, an investigation continued into who was actually responsible for the fire, however an official suspect list was never made public. 

The fire lasted a total of 18 days and 5 hours ending on October 16th, 2009 7pm. Even after the fire was officially deemed to be over many areas which had been hotspots for the fires, remained a threat. There were many reasons that the Station Fire was one of the most difficult fire to deal with successfully. Firstly most of the fire was on unworkable terrain such as steep hillsides sides. Secondly as this fire was a forest fire, there were huge trees falling after their extensive roots systems (which normally keep them standing) had been burned. This meant that firefighters had to avoid falling trees, while combating the fire.

The Station fire has been recorded as the largest fire in LA County history, as well as the 10th largest fire in California since 1933. It is reported that a total of 12,000 buildings were threatened during the fire, most of these being homes, as well as 160,000 acres of National Forests within the San Gabriel Mountains. In total 18 homes were destroyed and 2 people were killed, these were unfortunately firefighters. Many firefighters were admitted to hospital with injuries ranging from smoke inhalation to external injuries.

One of the most memorable features of this fire was the speed that it spread, this is illustrated in both maps above. As the colours change from dark red to yellow, this illustrates more time passing with dark red being the epicenter. The second map I have shows the location of the larger rivers within LA County. I created this thematic map to examine a correlation between the spread of fire in relation to the rivers, as I would expect that the fire would not be able to spread well in dense river areas. It can be seen that the there are multiple rivers to the south of the epicenter of fire, and the fire did not spread south at all. On the northern boundary of the largest perimeter of the fire (9/02 at 7:02), there are once again multiple rivers. This could prove the theory that the fire does not spread in areas were rivers are prevalent  However the fact in the middle of the largest perimeter of the fire there are multiple rivers may disprove this theory. 


The use and importance of GIS is quite clear for a situation like this one. Detailed maps can be easily created showing different types of information, from postal zones to roads to hospitals. These maps can be extremely useful in examining relationships between different features. Taking the Station Fire, my river map is an example of a theory of fire prevention. However I could have created a map illustrating which postal areas were affected the worst. I could also have created a map showing important historical sites and which, if any, were affected by the fire. All of these maps graphically illustrated data in a way that is much easier to understand then if illustrated simply on an attribute table. 















Wednesday, March 6, 2013

Lab 7

Lab 7




This map shows the distribution of African American's living in different counties within the continental United States. The key below the map clearly shows the darker the shade of red is equivalent to more African American's in a given county. The map shows that more African Americans live in the South East of the United States of America. With the highest concentration living in states such as Alabama and Georgia. 





This map shows the distribution of Asian people living in certain counties within the continental United States. The darker the shade of green illustrates a higher proportion of Asian people living within a given county. The map shows that the highest concentration of Asians reside on the west coast, while the middle of America has a relatively low number of Asian people in each county. 

This map shows the distribution of 'some other race of people' living in certain counties within the continental United States. The darker the shade of purple is proportional to the higher proportion of 'some other race of people' living within a given county. The map shows that the highest concentration of 'some other race of people' live in the western and south western states, while the middle of the United States and the east coast have a much lower concentration. 

This consensus map series shows the distribution of different races across America. It can be seen that African American's tend to live in the south of America, Asians reside in mainly the west coast and 'some other race of people' live also on the west coast and in some south western states.  These maps are highly useful for the any number of reasons in which finding large communities of certain races is necessary. 

Overall I found GIS hard to use in the beginning. I did not know many of the controls and I was constantly having to ask for help, however after the 3rd lab using GIS I found that we were using controls which we had already learnt to use and I was no longer having to look up how to preform tasks using the software. I found this latest lab the easiest of all, because it really used a lot of information which we had already gone over. The visuals of the GIS software are also very good and make it easy to use. As most of our tutorials showed the old software and we were using the new software I can see how much more user friendly the GIS software has become.