Schedule

1. Schedule • Today 2/27/08 • Precedents from Hanna book • Britney—Chapter 12 • Discussion • Tutorial 5 • Merged 2006 land cover theme • Tutorial 6 • Digitize 1939 land cover

2. Schedule • Friday 2/29/08 • Tutorial 6 – Finish digitizing 1939 LC • Tutorial 7 – Download data for Project 4 • Monday 3/03/08 • Due • 1939 land cover files • Theme, Layout • LC change worksheet • Tutorial 7 – all files • Begin Project 4

3. 2006 Land Cover (before merge) Total polygons = 5,496

4. 2006 Land Cover (after merge) Total polygons = 5,496

5. Today’s spatial questions • What land cover types were in your assigned sections in 1939? Where? How much? • Tutorial 6

6. Digitizing tips • Don’t delete a polygon • You’ll leave a hole • Don’t double digitize a line • If you do, you’ll make slivers • Don’t click and drag polygons • You’ll make gaps and overlaps • LC_name • If no polygons selected • Don’t use field calculator

7. Digitizing tips • Do edge match with your neighbors • Agree on code/name • Do re-calculate geometry (acres) • After editing polygons • Do check spelling of LC_names • Do separate each annual crop field • Separate polygon • Do download 1939 aerial images • One for each section