This week we learned to georeference using 1st, 2nd and 3rd order polynomial transformation. We learned how to add edits to map layers and then we had some fun with ArcScene creating a 3D rendering of the UWF campus using a DEM and other data from the 1st part of our lab. Because I've worked for the past 20 years in the civil engineering and land survey profession, I was already familiar with some of the basic steps for georeferencing and digitizing information. Many times we have been provided information as scans with no spatial reference and have had to find common points to rotate and translate the information into something useful in Autocad and then digitize the infomation so that the linework was native to the .dwg. I enjoyed the process in ArcDesktop and really like the fact that you can save your control point selections and also preview your results as you go as well as any changes occuring when you select different transformation options. Although I had some trouble with a possibly corrupt file, the remainder of the lab went smoothly. I had previously experimented with the edit feature and was not too challenged by that portion of the lab. There are one or two pitfalls which could occur if you are not paying attention to your steps during the edit process:
- Make sure you select the layer on which you want to perform your edits!
- Make sure you choose save edits when you are done and then choose stop editing.
Here is my map from the first portion of our lab:
We had some time to use ArcScene in our Cartography class last week. I tried to use the skills I learned there and apply them to this lab to create the 3D rendering for the final portion of this lab. This is my map for the final portion of our lab:
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