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Gis mapping by jvc
- 1. Mapping session LIWG 02.03.2012 1
- 2. Contents • Introduction • Workingwith 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. Contents • Creating newshape 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. What is QGISand what we can do with it? Geographic Information System for managing geographic information Collection, management, analysis and presentation of geospatial data 4
- 5. VECTOR and RASTERDATA • 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. VECTOR and RASTERDATA • 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. VECTOR and RASTERDATA 7
- 8. The layer-concept Every layerhas a different theme! ! In every layer there are only elements ! of one type (points, lines, polygons, raster)! ! 8
- 9.
- 10. Add layer 2. Click „Browes“ 3. Click Location Shp 1. Click „Add layer“-button 10
- 11. Add layer taskbar Table of contents Display window 11
- 12. Add layer A layer shape file = geospatial vector data format for geographic information systems software It 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. Add layer If you want to work with a layer activate the layer by clicking on it! Not active Active 13
- 14. Navigation Tools Zoom in Zoom out Zoom to selection Previous Zoom Pan map Full extent Zoom to layer Next Zoom Moving the mouse over the buttons see what you can do with them 14
- 15.
- 16. Dereferencing Transformation settings Start georeferencing 16
- 17. Creating a newlayer • Creating a new shape file • Edit shpe file • Creating a new shpe file from selected features 17
- 18. Creating a newlayer 18 New shapefile layer
- 19. Creating a newlayer 19 New shapefile layer Cut proligon
- 20. Edit shapefile layer& field caculator 20 Merge selection features Field caculator
- 21. Field caculator 21 Click open field calculator Area calculatot HA
- 22. Creating a newshpe file from selected features 22 Click save as selected Select coordinet system
- 23. New layer formPLMA map New shapefile Area PLMA approve 23
- 24. PLMA map &NLMA2010_SVK_Concessions Point Concessions area NLMA 24
- 25. Overlap PLMA appoveand GPS planted area GPS data Way point and Track 25
- 26. Overlap PLMA appoveand area planted 26
- 27. Overlap PLMA appoveand area planted Land clearance do not follow Area permission 27
- 28. Area planted Overlapwith image 28
- 29. Compare PULP HXYvillage NAFES Map JVC Map
- 30. By/Mr Sengchan PHOMMACHANH