1. 1 Analysis I: Selection And an introduction to planning an analysis

2. 2 Topics Selection and its booby traps A Project Demo

3. 3 Selection Three ways to select… –Manual using the tool –Select by Attribute –Select by Location Booby Trap

4. 4 Nitty-Gritty Limiting what can be selected Set it in Selection TOC tab Or In Selection menu / Set Selectable Layers This is good practice because Doing this prevent you from selecting the wrong layer

5. 5 Select by Attribute Right Layer? List only selectable FCs Kind of selection Fields in layer Operation SQL statement

6. 6 Booby Traps Not selecting from right layer Not paying attention to the selection process –Create New Selection –Add to the current selection –Remove from the current selection –Select from the current selection

7. 7 Select by Attribute

8. 8 Select from current selection Still Tax Parcels But I want only those parcels that area >4.9 acresa

9. 9 Select by Location

10. 10 Analysis Options: Location Intersect Are within a distance of Completely Contain Are completely within Have their centroid in Touch the boundary of Share a line segment with Are identical to Are crossed by the outline of Contain Are contained by

11. 11 Options: Intersect

12. 12 Options:Touch Bndy of…

13. 13 Options: Have their Center in…

14. 14 Options: Are completely w/in…

15. 15 Options: w/in a distance of…

16. 16 Options: are contained by…

17. 17 Options: are contained by…

18. 18 The Problem Ripemoff Power Co needs to… –Find areas where, in Martinsburg, Willow can be grown and harvested with farm types of machinery –The requirements are…

19. 19 TaxParcel Requirements Land USE must be Ag.. Land Cover must be Ag Slope in the parcel... must be everywhere less than or equal to 8%. Tax parcels must be.. 50 acres or more No wetlands No ponds.. Tax Parcel data [CLS].. Landsat data [grid code].. Slope from DEM & processed into poly shape.. TaxParcel data [acres] … MartDECwet …Ponds

20. 20 TaxParcel Requirements Land USE must be Ag.. Land Cover must be Ag Slope in the parcel... must be everywhere less than or equal to 8%. Tax parcels must be.. 50 acres or more No wetlands No ponds.. Select by Attribute.. Complex raster processing.. Select by Attribute … Select by location

21. 21 TaxParcel Requirements Land USE must be Ag.. Land Cover must be Ag Slope in the parcel... must be everywhere less than or equal to 8%. Tax parcels must be.. 50 acres or more No wetlands No ponds.. [cls]>=120 AND [cls] <200.. [gridcode]=4.. [slope>]=8 … [acres]>=50 … Switch selection … Ditto

22. 22 Switch? Selected  unselected Unselected  Selected Selected = NOT(selected) Where?

23. 23 Plan TAX AREA OKCLS OK Export attribute CLS OKAREA OK BOTH OK INTERSECT CLS OK TAX BOTH OK NEW SET attribute Sel from sel’ed set Area ok

24. 24 Summary Selection processing can solve a lot of problems in analysis Booby traps abound – due on not paying attention Choice of –Saving the results of each operation –Or using the “select from selected set” trick