This video features an introduction to geojson.io, a browser-based utility that is both elegant and efficient for creating simple vector features for GIS projects. While desktop GIS, be it QGIS or ArcGIS, both contain numerous options for creating vector features from scratch, geojson.io excels with a clean, elegant interface by which you have control over both appearance and the code expression of your features.
This assignment tutorial covers working with DEM data in ArcGIS utilizing standard Spatial Analyst tools - Aspect, Hillshade, Slope and Contours. The assignment assumes that the user has accomplished the first part of the assignment - acquiring Open Topo SRTM 30M DEM for a global city. A video guide for acquiring this data is available here: vimeo.com/156868924
Reference is made in the video to a Z Factor calculation; more information for the Z Factor can be derived from this linked PDF: http://bit.ly/2bCUTEq