JGrass workshop at FOSS4G2008, first part. Introduction to JGrass.

1. GETTING STARTED WITH JGRASS & GIS Silvia Franceschi Andrea Antonello FOSS4G WORKSHOP 2008-10-03

3. JGRASS BRANDED VERSION INSTALLATION The complete branded version of JGrass is released only for special events or specific projects JGrass_foss4g Installation is easy, simply double click on the executable and follow the NNNI (next-next-next-installation) instructions. The complete branded version of JGrass for the Windows OS contains also the GRASS executables needed by JGrass to run GRASS commands.

5. INSTALLATION AS A uDig PLUGIN Select to install new functionalities and go on with the wizard. Select JGrass as the new functionality to install.

6. INSTALLATION AS A uDig PLUGIN

7. INSTALLATION AS A uDig PLUGIN

8. INSTALLATION AS A uDig PLUGIN

9. INSTALLATION AS A uDig PLUGIN

10. INSTALLATION AS A uDig PLUGIN

13. GUI DESCRIPTION PROJECT VIEW

14. GUI DESCRIPTION LAYERS VIEW

15. GUI DESCRIPTION MAP VIEW

16. GUI DESCRIPTION CATALOG AND ATTRIBUTE TABLE

17. DATA VISUALIZATION In JGrass-uDig it is possible to visualize georeferenced RASTER and VECTOR data. Vector data are completely supported by uDig itself. More info about this tools are available from the uDig website: http://udig.refractions.net/confluence/display/EN/Walkthrough+1 http://udig.refractions.net/confluence/display/EN/Walkthrough+2 For raster data there are some functionalities of uDig (essentially display images) and some others introduced by JGrass.

18. CREATION OF A NEW PROJECT The creation of a new project in uDig is automatic when importing a new layer, in any case we suggest to create a new project ad hoc for the data you are importing to keep all the information coherent and ordered.

19. CREATION OF A NEW PROJECT name of the new project

20. CREATION OF A NEW PROJECT path in which to save the project

24. OVERVIEW FOR VECTOR DATA

25. OVERVIEW FOR VECTOR DATA

26. OVERVIEW FOR VECTOR DATA

27. OVERVIEW FOR VECTOR DATA

28. OVERVIEW FOR VECTOR DATA

32. Image based raster data (as TIFF, JPG) can be visualized in JGrass-Udig the same way as explained for vector data before. Anyway, this type of data is not editable inside of the application, but only usable as base cartography. OVERVIEW OF RASTER DATA

33. OVERVIEW OF RASTER DATA

35. JGRASS: RASTER DATA ANALYSIS

36. The data structure of Jgrass data is completely tranparent to the user and handled by the application. The user only has to define the folder that is ment to represent the DATABASE and the name of the LOCATIONS AND MAPSETS as they are created. The creation of a new location occurrs through the menu: File -> New -> Other JGRASS: RASTER DATA ANALYSIS

37. JGRASS: RASTER DATA ANALYSIS

38. Path to the JGrass DATABASE JGRASS: RASTER DATA ANALYSIS

39. Name of the new LOCATION to create JGRASS: RASTER DATA ANALYSIS

40. Selection of the Coordinate Reference System JGRASS: RASTER DATA ANALYSIS

41. JGRASS: RASTER DATA ANALYSIS

42. JGRASS: RASTER DATA ANALYSIS

43. Definition of the new MAPSET Click here to add a new mapset JGRASS: RASTER DATA ANALYSIS

44. Drag and drop the file with extention “*.jgrass” that was created inside the new LOCATION into the Catalog of JGrass JGRASS: RASTER DATA ANALYSIS

45. JGRASS: RASTER DATA ANALYSIS

46. Data types that are directly importable into JGrass JGRASS: RASTER DATA ANALYSIS

47. Reset does a refresh on the list of maps available inside the Mapset visible in the Catalog JGRASS: RASTER DATA ANALYSIS

48. To visualize the data of the MAPSET it is recommended to create a new Map, in order to properly handle the projection information. Currently JGrass rasters do not support on-the-fly reprojection, so the Map projection has to be the proper one. This does not apply for example to vector data, which are reprojected quickly. We are currently working on on-the-fly reprojection support in JGrass. Right-click on the name of the map and select from the pop-up menu the option “ Add to new map ”. JGRASS: RASTER DATA ANALYSIS

49. JGRASS: RASTER DATA ANALYSIS

50. A very important concept for doing raster analysis is that of the Active Region or Working Region. The Active Region represents the portion of territory inside which all the calculations occur, i.e. the region on which the GRASS-JGrass algorithms will work. To visualize the Active Region just drag it onto the Map View taking it from: Catalog -> Map Graphics -> Active Region Graphic JGRASS: RASTER DATA ANALYSIS

51. A very important concept for doing raster analysis is that of the Active Region or Working Region. The Active Region represents the portion of territory inside which all the calculations occur, i.e. the region on which the GRASS-JGrass algorithms will work. To visualize the Active Region just drag it onto the Map View taking it from: Catalog -> Map Graphics -> Active Region Graphic JGRASS: RASTER DATA ANALYSIS

52. Since in the Catalog more than one LOCATION can be visualized and for a single LOCATION more than one MAPSET can be available, it is necessary to select the MAPSET on which the application is supposed to work (it is the MAPSET that holds the information of the Active Region). JGRASS: RASTER DATA ANALYSIS

53. The Active Region is visualized with its defaut settings, which is a a white area inside a green layer. All the analyses that are done with JGrass-GRASS commands are applied only to the Active Region and with the resolution of the Active Region. This means that if you do not have data inside the white area or if all the data are covered by the green region, they will not be used by the algorithms JGRASS: RASTER DATA ANALYSIS

54. JGRASS: RASTER DATA ANALYSIS

56. JGRASS: RASTER DATA ANALYSIS

57. JGRASS: RASTER DATA ANALYSIS

58. Click on the apply button twice!!!! JGRASS: RASTER DATA ANALYSIS

60. JGRASS: SETTING THE WORKING ENVIRONMENT

61. JGRASS: GENERAL COMMANDS