Wednesday, May 31, 2017

Applications - Module 2 Lahars

My goal was to identify hazardous drainage areas around Mt. Hood, Oregon in the eventuality of a volcanic eruption and potential lahar creation.  Drainage area identification was accomplished through compounding steps with ArcMaps Spatial Analyst Toolset.  Of foremost importance was locating Mt. Hood (found with the use of the XY Tool) and combining elevation raster data.  The elevation was fundamental to utilize the Spatial Analyst Hydrology Tools including Fill, Flow Direction, Flow Accumulation, and Stream to Feature.  Analysis of pixel percentages were also needed to determine where the likelihood of flowing water/lahar movement would occur.  This required the conversion of floating point data to integer data (using the Math, Integer Tool) to evaluate attribute table data (with the use of the Con Tool).  A ½ mile buffer needed to be established around the stream locations by using the Selection by Location and Buffer Tools.  After these areas were identified, we were to tally up the lahar effect on population and on the schools located within that ½ mile buffer. 
The most important lesson I learned was to properly label any geodatabase files and to fully understand their creation at the time of creation in order to minimize confusion in the long term.  I challenge that I decided to overcome with the help of Adobe Illustrated (although not prescribed in the directions, I found Ai incredibly helpful and fun last semester and thought that it would be good to continue using those skills learned), was the placement of all the city/county/stream labels.

Below is the final product with a summary of findings.

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