Confusion Matrices Confuse me

I will admit that even though I’ve had a few courses on land use/cover classification and accuracy assessments during my Master and PhD, I always get confused about what user and producer accuracy are, and even more so what Kappa is. In trying to assess the accuracy of my phenology based classification of cropland, I…

Spurious Correlations

This joint post developed from several discussions about correlations with (soon to be) Dr Martin Brandt who helped write this post. You will find the same post on his blog, as well as many other interesting posts. Correlations are a very famous and popular way to express relationships (and their strength) between two variables. Applications in environmental sciences span from relations…

Training data collection

When conducting a classification of land cover or land use, it’s helpful to have training data that can be used as input in statistical classification algorithms, or simply as a support for yourself. These points can be collected on the ground, by visiting different locations and taking GPS points, which is a rather time, energy…