1. How to Map Irrigated and Non-Irrigated Land on the Eastern Snake Plain Aquifer Quickly, Easily, and Well How to Map Irrigated and Non-Irrigated Land on the Eastern Snake Plain Aquifer Quickly, Easily, and Well Image Processing Bill Kramber Classification Editing Tony Morse CLU Editing Margie Wilkins

2. Outline Intro The Past The Present The Future of the Past

4. What, exactly, do you mean when you say, “Irrigation?” Irrigated all year long? Irrigated once or twice? Sub-irrigation? Entire field or only part? For now, if >75% of field irrigated on one date, then “Irrigated”

5. The Past 1980 RASA classification rasa80lc Landsat MSS 57 meter pixels Per point classifier with stratification 1992 BOR/IDWR classification Snakelc92 1:40,000 scale photos Several classes Digitized

6. rasa80lc

7. 1980 RASA rasa80lc

8. snakelc92

9. Snake92cl

10. Point Both rasa80lc and snakelc92 over mapped irrigated.

11. The Present Classification Scheme 1. Edit and correct CLU polygons 2. Run a 3-Phase Classifier 1) Per Pixel using 3 dates of NDVI 2) Overlay CLU polygons 3) Aggregate pixels by CLU polygon 3. Manual Edit of Classification 4. Allan buys the beer CLU??

12. A Bit About CLU USDA/FSA Common Land Unit Generally correspond to agricultural fields Generated for federal crop support programs Only the polygons are available – not attributes Done for all Idaho counties, but need some editing.

13. 3-Dates of NDVI Blue 6/20/2006 Green 7/22/2006 Red 8/7/2007 Cluster and Interpret spectral classes Phase 1: Per Pixel Classifier

14. Per Pixel Classifier Output

15. Phase 2: Overlay of CLU Polygons Polygon is “Irrigated” if polygon > 75% irrigated pixels

16. Phase 3: Aggregation by CLU Polygon Initial Classification

17. Before Editing

18. After Editing

20. Model Grid on final Classification

21. Point NDVI/CLU classification is better than Snakelc92

22. The Future of the Past Landsat Data Archive

23. 2000

24. 1990

25. 1986

26. 1984 MSS

27. Was it irrigated in 1992? 19922006

28. Unfinished Business Who wants to do it? Accuracy Evaluation

29. Snake River near Hagerman