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Geographic Information Systems

Geographic Information Systems. Using ESRI ArcGIS 9.3 Selection by attributes. Selectable Layers. SELECTION by attribute. Selectable Layers. SELECTION by attribute. SELECTION by attribute. Layer. SELECTION by attribute. Field. SELECTION by attribute. Operator.

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Geographic Information Systems

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  1. GeographicInformationSystems UsingESRI ArcGIS 9.3 Selectionbyattributes

  2. SelectableLayers SELECTION byattribute

  3. SelectableLayers SELECTION byattribute

  4. SELECTION byattribute

  5. Layer SELECTION byattribute

  6. Field SELECTION byattribute

  7. Operator SELECTION byattribute

  8. Value / Label SELECTION byattribute

  9. Value / Label SELECTION byattribute

  10. Value / Label SELECTION byattribute “TYPE” = 13is a simplequery

  11. Apply SELECTION byattribute

  12. Close SELECTION byattribute

  13. Result SELECTION byattribute

  14. Saveselection SELECTION byattribute

  15. Saveselection SELECTION byattribute

  16. Saveselection SELECTION byattribute

  17. Saveselection SELECTION byattribute

  18. Saveselection SELECTION byattribute

  19. Adding datato the selection SELECTION byattribute

  20. Adding datato the selection SELECTION byattribute

  21. Adding datato the selectionmethod SELECTION byattribute

  22. Adding datato the selectionnewselection SELECTION byattribute

  23. Adding datato the selectionApply SELECTION byattribute

  24. Adding datato the selectionClose SELECTION byattribute

  25. Adding datato the selectionResult SELECTION byattribute

  26. Removing datafrom the selectionmethod SELECTION byattribute

  27. Selecting a part of the selectionmethod SELECTION byattribute

  28. Selecting a part of the selectionInteractiveselectionmethod The method can bealsoselectedbefore, in the “Selection” sub-menu SELECTION byattribute

  29. Operations EqualDifferentGreaterGreater or equal LesserLesser or equal SELECTION byattribute

  30. Wildcard In the value/label, stand foreverypossibledigit/character e.g.“TYPE” = 1_selectsall the objectwhose “TYPE” is a twodigitnumberstartingwith 1 (i.e. 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19) SELECTION byattribute

  31. Condition “IS” Usedtoselectobjectswithemptyfields The queryis:“FIELD” IS NULLor, viceversa, thosewith non emptyfields The quesryis: “FIELD” IS NOT NULLwhere “FIELD” is the nameof the field SELECTION byattribute

  32. LogicOperators NOT It’s usedveryseldom: it’s easiertouse the oppositeconditione.g. “TYPE” NOT > 4isidenticalto“TYPE” <= 4 “TYPE” NOT = 4isidenticalto“TYPE” <> 4 SELECTION byattribute

  33. LogicOperators AND Connectstwoconditions: the objectisselectedifboth the conditions are truee.g.“TYPE” = 15 AND “NAME” >= “G” Similarto the method “selectfromcurrentselection” SELECTION byattribute

  34. LogicOperators OR Connectstwoconditions: the objectisselectedif at leastoneof the conditionsistruee.g.“TYPE” = 15 OR “NAME” >= “G” Similarto the method “Addtocurrentselection” SELECTION byattribute

  35. LogicOperators Itispossibletoconnectwithlogicoperatorsmanyconditions, making a complexquery SELECTION byattribute

  36. Parentheses The useofparenthesesmakesiteasierto create complexqueries SELECTION byattribute

  37. SQLThe “language” usedtoselectobjectsbyattributeiscalled SQL (Standard QueryLanguage).A wide literatureexists on itsuse and manylibrariesofqueries are available.

  38. Save / Load Itispossibletoverify the sintaxofcomplexqueriesbeforerunningthem. Usefulonlyforverycomplexqueries, sincewhentheyrunitmay take a long timebeforeanerrorisdetected SELECTION byattribute

  39. Save / Load Itispossibletosavequeries and thenloadthem at any moment. Usefulforqueriesthat are toberepeatedseveraltimes on differentdatasets SELECTION byattribute

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