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# Gis mapping presentation jvc in eng

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### Gis mapping presentation jvc in eng

1. 1. Mapping session LIWG 02.03.2012 1
2. 2. Contents• Introduction• Working with existing vector data Open the program and add layers Tools Change properties of the layers Save a project Layouting maps• Working with the attribute table Calculating geometries Field Caluculator 2
3. 3. Contents• Creating new shape files Adding an event layer (Coordinates from the GPS) Creating a new point/ line/ polygon shape file Creating a new shape file from selected features• Analysis Tools Buffer Join and Union 3
4. 4. What is QGIS and what we can do with it?Geographic Information System for managinggeographic information Collection, management, analysis and presentation of geospatial data 4
5. 5. VECTOR and RASTER DATA• Vector and raster are data formats used to store geospatial data!• Vector data use X and Y coordinates to define the locations of points, lines, and areas (polygons) that correspond to map features such as fire hydrants, trails, and parcels  spatial details• Standard GIS data: Shape file  stores both spatial data and their attributes 5
6. 6. VECTOR and RASTER DATA• Raster data use a matrix of square areas (pixels, cells, and grids) to define where features are located. The squares are typically of uniform size and their size determines the detail that can be maintained in the dataset. Because raster data represent square areas, they describe interiors rather than boundaries as is the case with vector data – data such as elevation, temperature, soil pH, etc. that vary continuously from location to location – aerial and satellite imagery 6
7. 7. VECTOR and RASTER DATA 7
8. 8. The layer-conceptEvery layer has a different theme! !In every layer there are only elements ! of one type (points, lines, polygons, raster)! ! 8
9. 9. Open the program 9
10. 10. Add layer 2. Click „Browes“ 3. Click Location Shp1. Click „Add layer“-button 10
12. 12. Add layerA layer  shape file = geospatial vector data format forgeographic information systems softwareIt contains different files:.dbf  store feature attribute data  every layer has a attribute table.prj  specifies the geographic coordinate system.shp  contains the primary geographic reference data  feature geometry 12
13. 13. Add layer If you want to work with a layer activate the layer by clicking on it!Not active Active 13
14. 14. Navigation Tools Zoom in Zoom out Zoom to selection Previous Zoom Pan map Full extent Zoom to layer Next ZoomMoving the mouse over the buttons  see what you can do with them 14
15. 15. Dereferencing 15
16. 16. DereferencingTransformation settings Start georeferencing 16
17. 17. Creating a new layer• Creating a new shape file• Edit shpe file• Creating a new shpe file from selected features 17
18. 18. Creating a new layer 18New shapefile layer
19. 19. Creating a new layer 19New shapefile layer Cut proligon
20. 20. Edit shapefile layer & field caculator 20Merge selection features Field caculator
21. 21. Field caculator 21Click open field calculator Area calculatot HA
22. 22. Creating a new shpe file from selected features 22 Click save as selected Select coordinet system
23. 23. New layer form PLMA map New shapefile Area PLMA approve 23
24. 24. PLMA map & NLMA2010_SVK_Concessions Point Concessions area NLMA 24
25. 25. Overlap PLMA appove and GPS planted area GPS data Way point and Track 25
26. 26. Overlap PLMA appove and area planted 26
27. 27. Overlap PLMA appove and area planted Land clearance do notfollow Area permission 27
28. 28. Area planted Overlap with image 28
29. 29. Compare PULP HXY village NAFES Map JVC Map
30. 30. By/Mr Sengchan PHOMMACHANH
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