Impact of Urbanization and Agriculture on the View Shed around Davis: A 12-Year Analysis, Study notes of Environmental Science

Download Impact of Urbanization and Agriculture on the View Shed around Davis: A 12-Year Analysis and more Study notes Environmental Science in PDF only on Docsity!

Open Space

How Urbanization and Agricultureimpact the View Shed around the

City of Davis

Introduction

-^

The development ofland has a dramaticimpact on the scenicaspects of the area andgreatly affect the feelof the area.

Agriculture

-^

Agriculture alsoimpacts the ViewShed. It especiallydetracts from thescenic views afterharvest and duringfallow periods.

Problem

• Has the View Shed Around Davis changed

over the years?

• If it has changed, what has changed and by

how much?

Calibration

• Empirical Line
  • A total of 50 points were used when finding the

light and dark pixels shared by the 1998 and2000 images

• They were then used to create an Empirical

Line image using the 1998 image as a reference

Classification

-^

Determine Classes– Trees– Grasses– Water– Agriculture– Soil– Urban– Open

-^

Combine Classes– View Shed

• Trees• Grasses• Water• Agriculture• Open
  • Detractor
    • Urban• Soil

Confusion??

• To determine the accuracy of the classified

image, a confusion matrix was created. Theclassification was found to be 84% accurate.

• Once the classes were combined to View

Shed and Detractor, the class image wasfound to be 91.89% accurate.

Classification

• The same classification parameters were

then used to create the 2000 class image.

• Another confusion matrix was run with all

classes and with the combined classes.

• Accuracy was found to be 64.34% for all

classes, and 82.78% with the combinedclasses

Result

• It was found that the View Shed around the

Davis area decreased by 837.25 hectaresover the 12 year period.

• This corresponds to a 7.22% change over 12

years

• Or about 0.60% annually

Conclusion

• Although Davis has expanded over the

years, the change was relatively small giventhe extent of the image.