Typewriter Map and Exit Seminar

Tomorrow is my exit seminar and thesis defense, so this seems like the right time to post something fun. I've recently started reading Daniel Huffman's blog, Something About Maps. He's a cartographer whose maps are a perfect balance of educational, data-driven, and artful. He recently made some maps using a typewriter-- my personal favorite is… Continue reading Typewriter Map and Exit Seminar

Types of Curvature

Curvature, the second derivative of elevation, is a very useful terrain derivative. It describes how convex or concave a surface is, which helps predict soil moisture (among other things). The basic terrain analysis feature in SAGA calculates plan curvature and profile curvature. Profile curvature goes with the direction of maximum slope, which helps estimate acceleration… Continue reading Types of Curvature

Getting Category Colors into QGIS from ColorBrewer

Are you as obsessed with ColorBrewer as I am? I am making a map where I color Ohio counties based on region, and used ColorBrewer to pick colors. The first thing I did was go to ColorBrewer and find a qualitative color set for 5 categories of data. Next I used the HEX codes provided… Continue reading Getting Category Colors into QGIS from ColorBrewer

Defining Common Terrain Derivatives

Last month I shared some ways to calculate terrain derivatives in SAGA, focusing on the Basic Terrain Analysis function. Today I'm going to give you a quick overview of what each derivative means and some of its potential uses. Let's start with the most intuitive ones. Slope is how fast elevation is changing. A higher… Continue reading Defining Common Terrain Derivatives