Synopsis of Topic
In this section we will go through the basics of creating topographic surfaces as raster digital elevation models from raw topographic data. We will use a standard and accepted technique of deriving a TIN first, then editing it to remove problematic interpolations, and then converting this TIN surface to a raster DEM surface.
Why we're Covering it
This topic will hopefully be review for many, but some of you may be either rusty on it or used to having someone else just provide the raster DEM you wish to use for change detection to you. The quality of a DEM and is subsequent utility in change detection analysis is highly dependent on the methods and care taken in deriving the surface. We are covering this topic to:
- Make sure everyone is on the same page with regards to where raster DEMs we use in change detection come from.
- Show participants some tricks in creating such surfaces that may increase their efficiency and proficiency at building surfaces.
Learning Outcomes Supported
This topic will help fulfill the following primary learning outcome(s)
for the workshop:
Data and Materials for Exercises
Prerequisite for this Exercise
- Some ArcGIS experience
- Some familiarity with DEMs (e.g. Topic B.)
Relevant Online Help or Tutorials for this Topic
Slides and/or Handouts
GIS References on Spatial Estimation & Interpolation