GPHY384, lecture 17&18
GPHY384, lecture 17&18 GPHY 384
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This 1 page Class Notes was uploaded by Sarah Massar on Thursday March 24, 2016. The Class Notes belongs to GPHY 384 at Montana State University taught by Stuart Challenger in Fall 2015. Since its upload, it has received 17 views. For similar materials see Advanced GIS and Spatial Analysis in Earth Sciences at Montana State University.
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Date Created: 03/24/16
GPHY384 Lecture 17&18 3/22&24 Lecture 17 3/22 SURFACE MODELING -In raster, deals with many types of surfaces -Involves: -Elevation -Digital Elevation Model (DEM)/ .dem (must be unzipped) -Slope -Aspect -Shaded Relief -Surface profiles -can see elevation change on a graph -Visibility analysis -helpful for placing cell towers -Surface interpolation-estimating an unknown value that falls between two known values -well depth used to estimate depth everywhere else -different technique +Spline- using a mathematical curve to smoothly represent variation on a surface +Inverse Distance Weighed (IDW)- weighted interpolation giving greater importance to cell values that are closer to the sample point + Kriging- assumes the spatial variation in the data is statistically homogeneous throughout the surface. -use statistical methods to estimate values -Can also do trail features (lines) -three ways to model solar radiation 1. Direct-sun hits mountain directly 2. Diffuse- goes through clouds first 3. Reflect- off of trees Lecture 18 3/24 -Talked about term project