Environmental Variables Used in Spatial Analysis

<p> Polygon shapefiles that comprise levels of six environmental variables are used in conjunction with downed trees to inform the spatial analysis. A census of downed trees is created in each region within each environmental variable. Four environmental variables (elevation, generalized slope, Euclidean Distance From River [EDFR], Inundation Probability) were generated by classification of raster maps that have a resolution (1.0m) and pixel locations coincident to the topography raster map that is input into HEC-RAS and featured in Castillo et al. (under revew). Two classified variables (vegetation community, soil type) are informed by data form Ecological Mapping Systems of Texas (Elliott et.al., 2014)</p>
<p> Castillo, C. R., Güneralp, I, Hales, B. U., Güneralp, B. (in review). Scale-Free Structure of Surface-Water Connectivity within a Lowland River-Floodplain Landscape. Geophysical Research Letters.</p>
<p> Elliott, L.F., Treuer-Kuehn, A., Blodgett, C.F., True. C.D., German, D. Diamond, D.D. (2014). Ecological System of Texas: 391 Mapped Types, edited by Texas Parks and Wildlife Department and Texas Water Development Board, Austin, TX. url: https://tpwd.texas.gov/landwater/land/programs/landscape-ecology/ems/</p>
<p> Zevenbergen, L.W. and C.R. Thorne. (1987), Quantitative analysis of land surface topography. Earth Surface Processes and Landforms, 12, 47-56.</p>