1. Styled Layer Descriptor (SLD) or How I Learned To Stop Worrying and Love XML Mike Pumphrey FOSS4G, Sydney, Australia October 23, 2009 1

2. 2

3. Geospatial data has no inherent visualization 3

4. We are all designers now. (Oh no.) 4

5. Style (noun/verb) : 1.The way in which something is said, done, expressed, or performed. 2.A customary manner of presenting material. 3.The missing piece that turns geospatial data into a completed map. 5

6. Ways to style maps Mapfile AXL ArcGIS Style files etc... 6

7. Styled Layer Descriptor (SLD) 7

8. OGC standard (and we do love standards) 8

9. <StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> topp:street_centerline feat_type 0 1890 XML? Really? 9

10. XML: Computers v. Humans Computer “Ooh, this is easy to read and output. I like this. “ Human “Oh dear, it looks like it was written by the Society for Far Too Much Verbosity and Redundancy Society.” 10

11. How to Get By and also a preview of the future of styling with SLD 11

12. What’s in an SLD file? 1.Symbology (Symbolizers) – Rules for drawing: Point/Line/Polygon/Text/Raster 2.Metadata – Name/Title/Abstract 12

13. An SLD... 13

14. Map Information... 14

15. Metadata town_street_1 Town Streets If you want to know all about the streets in this town, this layer is for you. 15

16. Remember: Don’t forget to call home Brush and floss twice a day Create metadata 16

17. Symbology … … … … 17

18. Symbology: Points Shape circle 18

19. Symbology: Points Size 36 19

20. Symbology: Points Inside (Fill) #FF0000 20

21. Symbology: Points Graphic image/png 21

22. Symbology: Points Outside (Stroke) #000000 2 22

23. Symbology: Polygons Inside (Fill) #00FF00 23

24. Symbology: Polygons Outside (Stroke) #FF0080 5 24

25. Symbology: Lines Q: and for lines? A: Fake it. 25

26. Symbology: Lines Two lines = simulated fill/stroke #000000 16 #0000FF 14 26

27. Symbology: Lines + = Two lines = simulated fill/stroke 27

28. Symbology: Lines Uh oh. 28

29. Symbology: Lines #000000 16 #0000FF 14 29

30. Symbology: Lines Ahhh. 30

31. Symbology: Text 31

32. Symbology: Text name Label content 32

33. Symbology: Text Font (size, color, weight) Arial 12 normal bold 33

34. Symbology: Text Placement 0.5 0 15 34

35. Symbology: Text With points: 35

36. Symbology: Text With polygons: 36

37. Symbology: Text With lines? 37

38. Symbology: Text Vendor Options! true 38

39. Symbology: Text true 60 100 30 50 etc... 39

40. Symbology: Raster Digital Elevation Model 40

41. Symbology: Raster Digital Elevation Model 41

42. Attribute-based styling Customize feature display Show only what you want to show 42

43. Attribute-based styling 43

44. Attribute-based styling Filters apply to Rules, not individual symbolizers name Thisland... 44

45. Zoom-based styling Display at certain zoom levels 1000 10000 45

46. Zoom-and-attribute-based styling This gets messy: M filters at N zoom levels = M x N rules! 46

47. Alternatives to coding by hand (yay!) 47

48. uDig 48

49. Styler 49

50. CSS to SLD 50

51. Questions? 51

52. Styled Layer Descriptor (SLD) or How I Learned To Stop Worrying and Love XML Mike Pumphrey mike@opengeo.org Thanks! 52