Applications in GIS (GIS 5100): Lab 3

In this week's assignment, we learned how to create a watershed analysis on ArcMap. The DEM had to be Fill so the stream segments would not be disconnected when the flow direction tool and the flow accumulation tool were run. After running the flow direction tool and the flow accumulation tool, the Con tool was used to define the streams by the value of 200 or greater. Once the streams were defined, they were then converted into polyline features which were then used the Stream Link tool to visually see each stream segment. The output of the Stream Link tool was applied the Stream Order tools were put the stream into a ranking system. Also the Stream Link's output was applied to the Watershed tool and this allowed us to see the all of the watersheds on Kauai.

I decided to focus on the Hanapepe River watershed for my map. I had to create a new point shapefile in ArcCatalog which I used as my Pour Point layer. The pour point was used to created the modeled watershed that was somewhat different than the observed watershed. To compare the two watershed, the metric unit that I decided to use is acres. Using acre measurements would allow individuals to know how much land is being used to create these watersheds and the numbers won’t be so overwhelming to the individuals who are viewing this data. The data would be determined by using the attribute table again to add a new field to the table and we can use the field calculator to calculate the area of both polygon features.The amount of acres that wshed_pour14 is covering is 17226 acres. The amount of acres that Hanapepe_wshed is covering is 17163 acres. The wshed_pour14 is covering more land than Hanapepe_wshed which from a visual standpoint did not overly appear so in the map of Kauai.