If you missed my posts on terrain derivatives or SAGA, you may want to jump back and read those first. Today I'm going to talk about two very common terrain derivatives and how to calculate them in SAGA. I'm going to keep going with the same DEM from Mt. Gilead State Park I used in… Continue reading Basic Terrain Analysis: SAGA
In agronomy research, its very common to collect 10 plants from a single plot, take measurements on them, and average those measurements. The plot average is the value we run statistics on, whether that means building a regression or running an ANOVA. I've recently seen a lot of my fellow grad students averaging measurements by… Continue reading Averaging Plot Data in R
Last week I mentioned terrain derivatives and promised some how-to posts. I'm going to start with an brief intro to SAGA GIS, which is my preferred software for generating terrain derivatives. SAGA was written in the early 2000s and has been regularly updated-- you can learn more from its makers here. You can download SAGA… Continue reading Intro to SAGA GIS
There are a lot of good ways to compile different images into a single figure. For me, the print composer in QGIS works to get my map, scales, and legends into a single TIFF to embed in a word document or send as an attachment 90 percent of the time. The other 10 percent of… Continue reading Making Figures in PowerPoint
Lots of people have been asking me about terrain derivatives lately, and I've been putting off blogging about them for a while because I just didn't know where to start. Instead of one master post with all the things I decided to split it into some more manageable chunks-- for both your sake and mine.… Continue reading What are terrain derivatives?
The primary reason I started Spatially Challenged is to have a lasting record of questions I get asked frequently. Since the American Society of Agronomy meeting in November, I've had a number of questions about terrain derivatives like curvature, terrain wetness index, etc. I promise I've heard those questions and the answers are coming! I… Continue reading 2019 Preview and Captioning Photos in Word
We're getting into winter holidays, so I will likely post infrequently between now and the start of spring semester. Before that break though, here are three brief notes in celebration of 6 months of blogging! Firstly, a quick summary of the blog so far (updated as of 18 Dec 2018). Spatially Challenged has been viewed… Continue reading 6 Months of Spatially Challenged!