While continuing our study of land use cover change in the Portland area, we have started to map our data from our other labs in order to analyze change which may have occurred since 1931. Our last labs, posted here, were used to collect data from our specific site, a residential home in Collins View, as well as gain data from 11 other sites that our peers took, including Collins View, Riverview and Lewis and Clark, 4 groups in each area respectively. For this specific lab, we took all our data which we organized in our last lab, and began adding it to ARCGIS. This is a program that can give us an aerial map view of the sites separated by color, and the field points indicated, as you can see in the base map below in figure 1. The pink indicates the RVNA area that 4 groups went to, showing one outlier as one group went slightly farther than the designated area. The orange indicating the Collins view boundary, which had 4 more groups and the red indicates the Lewis and Clark boundary which also contains all 4 groups. Once we added the three separate locations of study, we entered all the collected data we comprised last week. This data consisted of humidity, temperature, canopy cover, ground cover, and more data from the past labs. We looked at many different versions of this map by applying different layers as well as adding 3 overlaying pictures. These 3 pictures showed the same area in 1939, 1961 and 1982 respectively. This allowed us to overlay different data points found by our teams of current data, over the older maps to analyze the land cover change, as you can see below. Starting by mapping temperature compared to canopy cover (figure 2). You can tell that more canopy covered recorded in a location has a correlation keeping max temperatures lower than in other areas with less cover. Canopy and ground cover are two of the attributes that visually change the most while looking at archived photos from the past. We have 4 different aerial photos from the archives, the 1939 photo, the 61’ photo, the 82’ photo, and the current google maps aerial for 2018. Taking the 12 research points we are able to overlay the different aerial photographs from the different decades to observe what the land us is for that time period. Starting with 1939 you can inspect the canopy cover and follow it as it changes. For our specific location in Collins View (45.46, -122.68), Land use visible changes between 39' (figure 4) and 61' (figure 5). Although canopy cover in the exact location does not change too much, the agricultural land around it does. The whole neighborhood starts the shift into a suburban setting. At the same time Lewis and Clark starts to transform it’s campus into the whole we recognize today. After 1934 the area in red was acquired to start an Albany College campus in portland and by 1939 you can see it taking shape. As of 1961 the campus takes shape. At the same time Collins View shifts into the residential area that we know. During all this RVNA stayed fairly consistent. If you compare the 1939 photograph with the current aerial images you will not find much change in canopy cover among the land. In each of the other sites however, canopy cover changes immensely over the roughly 80 year period. As stated in our past lab, this datapoint caught our attention. It seems to be the piece of data that is most different since the canopies may be keeping these areas from getting quiet as hot. Additionally ground cover could also assist in keeping these areas slightly cooler. As far as biodiversity is concerned, I am curious as to how these canopy and ground cover changes may be advantageous or possibly disadvantageous. Additionally I am curious as to how the changes between ‘39 and ‘61 may have shifted our land use and biodiversity in the area. We can now tell between the data and images that Collins View and Lewis and Clark share many of the same characteristics, whereas Riverview may represent more of what the area used to act like. To better understand these changes we would need to take more data from additional sites to see how much these changes have affected the environment. Accounts of the past may also help us to understand changes to re enforce the photographs.