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News in GRASS GIS7. Plenary talk at FOSS4G-CEE 2013, Romania

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News in GRASS GIS7. Plenary talk at FOSS4G-CEE 2013, Romania

Jun. 18, 2013
• 8 likes • 4,609 views

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GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is the free Geographic Information System (GIS) software with the longest record of development as FOSS4G community project. The increasing demand for a robust and modern analytical free GIS led to the start of GRASS GIS 7 development in April 2008. Since GRASS 6 more than 10,000 changes have been implemented with a series of new modules for vector network analysis, image processing, voxel analysis, time series management and improved graphical user interface (http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures). The core system offers a new Python API and large file support for massive data analysis. Many modules have been undergone major optimization also in terms of speed. The presentation will highlight the advantages for users to migrate to the upcoming GRASS GIS 7 release.

Transcript

  1. 1. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Markus Neteler Fondazione E. Mach – CRI, Italy http://gis.cri.fmach.it & GRASS Development Team FOSS4G-CEE 2013 Bucharest, Romania News in GRASS GIS 7
  2. 2. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS 7 User interface DE JA PL
  3. 3. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS: Interoperability LAS
  4. 4. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS: Project database (Location) wizard From GeoTIFF or SHAPE or ... And directly import file
  5. 5. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New map histogram tool Using the Wake county “elevation” map: Map will be preselected if selected in Layer Manager
  6. 6. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Adding a grid to the map view ● Grids ● Labels ● Geodesic lines ● Rhumblines
  7. 7. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New Geospatial Modeller Extra bonus: export to Python scripts
  8. 8. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New visualization tool: wxNVIZ http://grasswiki.osgeo.org/wiki/WxNVIZ Programming/screenshot: Anna Kratochvílová
  9. 9. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector geometry types Point Centroid Line Boundary Area (boundary + centroid) face (3D area) [kernel (3D centroid)] [volumes (faces + kernel)] Geometry is true 3D when: x, y, z notinallGIS! Faces GRASS Topological 2D/3D Vector model
  10. 10. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Topological Vector Digitizer
  11. 11. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Topological Vector Digitizer in PostGIS 2 (under development) http://grass.osgeo.org/grass70/manuals/v.out.postgis.html http://grasswiki.osgeo.org/wiki/PostGIS_Topology Programmer: Martin Landa Cofunded by Municipality of Trento, Italy
  12. 12. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense News in GRASS 7's Vector Topology Spatial query example Query of vector point maps GUI: click on vector map, what is there? CLI: v.what east_north=east,north 0 2 4 6 8 10 12 0 120 240 360 480 600 GRASS 6.4.2 GRASS 7 million points seconds
  13. 13. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector network analysis in GRASS GRASS vector network analysis
  14. 14. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector network analysis General concept of a network graph ● Arcs connected by nodes ● Forward/backward costs assigned to each arc (oneway road) ● Starting point(s) ● Ending point(s) GRASS vector analysis Cost definition examples ● Distance ● Travelling time ● Travelling costs (fuel, train ticket, etc)  shortest path  fastest path  cheapest path GsoC 2013: implementation of turns support
  15. 15. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Traveling time as costs Result Network analysis: traveling salesman
  16. 16. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Distances as costs Result Network analysis: traveling salesman
  17. 17. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Distances as costs Result Network analysis: allocate subnets … and many more algorithms... see the manual!
  18. 18. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New Space-Time functionality in GRASS 7
  19. 19. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New animation tool for time series http://grass.osgeo.org/grass70/manuals/g.gui.animation.html
  20. 20. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New Map swiping tool for multitemporal maps Pre and post disaster images of the tsunami in Japan in 2011 (MODIS images taken on February 26 and March 13, 2011)
  21. 21. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New geocoding tool Image/Map rectifier For raster (imagery, historic scans) and vector maps
  22. 22. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7 Addons: User contributed extensions http://grass.osgeo.org/wiki/Addons The Addons repository is SVN based: User can easily obtain write access to develop new functionality Installation with extension manager Increasing inflow of Python scripts
  23. 23. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Support for massive spatial datasets in GRASS GIS
  24. 24. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Support for massive datasets What is massive? Massive is relative to Hardware resources Software capabilities Operating system capabilities Limiting factors RAM Processing time Disk space Largest supported file size
  25. 25. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Support for massive datasets Cost surfaces: r.cost 0 1 2 3 4 5 6 7 8 9 10 0 120 240 360 480 600 GRASS 6.4.2 GRASS 7 million points seconds Other speed figure: PCA of 30 million pixels in 6 seconds on this small presentation laptop...
  26. 26. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Main basins New tools for hydrological modelling Distance to the outlet
  27. 27. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Programming own applications with GRASS GIS 7
  28. 28. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS and Python Script part: Parser part (for GUI autocreation and command line support):
  29. 29. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS 7 Python API http://grass.osgeo.org/wiki/GRASS_and_Python
  30. 30. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS 7 Python API http://dx.doi.org/10.3390/ijgi2010201
  31. 31. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7 Programmer's manual http://grass.osgeo.org/programming7/
  32. 32. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS as Open Source GIS backbone: Connecting to other software packages
  33. 33. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS and QGIS Integration: Sextante http://grass.osgeo.org/wiki/GRASS_and_Sextante
  34. 34. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense SEXTANTE – GRASS Integration: Modeller Note: Partially functional in gvSIG OADE 2010, more to come in (near) future...
  35. 35. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense QGIS-Sextante – Using GRASS in QGIS via Sextante 1 2 3 http://grasswiki.osgeo.org/wiki/GRASS_and_Sextante
  36. 36. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense QGIS-Sextante – Vector dissolving example Dissolving geometry by string column attributes: Sextante calls GRASS GIS in a virtual session which deliver the result back (here SHAPE file)
  37. 37. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Native WPS Support
  38. 38. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS and R Integration GRASS 7.0.svn (nc_spm_08_grass7):~ > R R version 3.0.1 (2013-05-16) -- "Good Sport" Copyright (C) 2013 The R Foundation for Statistical Computing Platform: x86_64-redhat-linux-gnu (64-bit) > library(spgrass6) Loading required package: sp Loading required package: XML GRASS GIS interface loaded with GRASS version: GRASS 7.0.svn (2013) and location: nc_spm_08_grass7 > > myrast <- readRAST6(c("geology", "elevation"), cat=c(TRUE, FALSE)) > myvect <- readVECT6("roads") … > writeRAST6(myrast, "elev_filt", zcol="elev") ... http://grass.osgeo.org/wiki/R_statistics
  39. 39. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Visualization
  40. 40. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Visualization: GRASS data export to for Augmented Reality GRASS GIS, Paraview, and ARToolkit
  41. 41. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense http://it.wikipedia.org/wiki/Imaging_a_risonanza_magnetica Our FEM colleague --> Personal comm. A researcher's brain... From MRT scan to Voxels
  42. 42. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  43. 43. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  44. 44. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  45. 45. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: News in Image processing Improved modules: Georectification Orthorectification Atmospheric correction Terrain correction Landsat cloud detection
  46. 46. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Ortho-rectification of aerial images Why using the DEM for image rectification: Incorporating the DEM fixes the rectification problem Linear rectification (insufficient) (Problem commonly seen in Google Earth) Ortho-rectification OK at bottom of valley Wrong in altitude Wrong in altitude Incorporating the DEM fixes the rectification problem
  47. 47. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New bivariate Scatterplots LANDSAT 7 2002 channels 1 and 3 of Wake county, NC
  48. 48. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Supervised image classification http://geo.fsv.cvut.cz/~landa/publications/2012/ogrs2012/poster/figures / Tool for supervised classification of imagery data. Generates spectral signatures for an image by allowing the user to outline regions of interest.
  49. 49. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Unsupervised image classification – Segmentation # set comp. region to orthophoto but align pixels to elevation map (for speed reasons in # this demonstrational exercise – for real work please use the true resolution) g.region rast=ortho2010_t792_subset_20cm.blue align=elev_lid792_1m -p # Note: the RGB bands are organized as a group i.segment group=ortho2010_t792_subset_20cm output=ortho2010_t792_subset_20cm_segment goodness=ortho2010_t792_subset_20cm_seg_fit threshold=0.25 Finally vectorize with r.to.vect i.segment - Identifies segments (objects) from imagery data.
  50. 50. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Where is the stuff? GRASS GIS Software: Free download for MS Windows, MacOSX, Linux and source code: http://grass.osgeo.org/download/ Addons (user contributed extensions): http://grasswiki.osgeo.org/wiki/GRASS_AddOns Free sample data: Rich data set of North Carolina (NC) … available as GRASS GIS location and in common GIS formats http://grass.osgeo.org/download/sample-data/ User Help: Mailing lists (also in different languages): http://grass.osgeo.org/support/ Wiki: http://grasswiki.osgeo.org/wiki/ Manuals: http://grass.osgeo.org/documentation/manuals/
  51. 51. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Markus Neteler Fondazione E. Mach (FEM) Centro Ricerca e Innovazione GIS and Remote Sensing Unit 38010 S. Michele all'Adige (Trento), Italy http://gis.cri.fmach.it http://www.osgeo.org markus.neteler@fmach.it neteler@osgeo.org Enjoy GRASS GIS 7! THANKS! PostGISomics http://grass.osgeo.org http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures
Technology

Description

GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is the free Geographic Information System (GIS) software with the longest record of development as FOSS4G community project. The increasing demand for a robust and modern analytical free GIS led to the start of GRASS GIS 7 development in April 2008. Since GRASS 6 more than 10,000 changes have been implemented with a series of new modules for vector network analysis, image processing, voxel analysis, time series management and improved graphical user interface (http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures). The core system offers a new Python API and large file support for massive data analysis. Many modules have been undergone major optimization also in terms of speed. The presentation will highlight the advantages for users to migrate to the upcoming GRASS GIS 7 release.

Transcript

  1. 1. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Markus Neteler Fondazione E. Mach – CRI, Italy http://gis.cri.fmach.it & GRASS Development Team FOSS4G-CEE 2013 Bucharest, Romania News in GRASS GIS 7
  2. 2. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS 7 User interface DE JA PL
  3. 3. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS: Interoperability LAS
  4. 4. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS: Project database (Location) wizard From GeoTIFF or SHAPE or ... And directly import file
  5. 5. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New map histogram tool Using the Wake county “elevation” map: Map will be preselected if selected in Layer Manager
  6. 6. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Adding a grid to the map view ● Grids ● Labels ● Geodesic lines ● Rhumblines
  7. 7. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New Geospatial Modeller Extra bonus: export to Python scripts
  8. 8. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New visualization tool: wxNVIZ http://grasswiki.osgeo.org/wiki/WxNVIZ Programming/screenshot: Anna Kratochvílová
  9. 9. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector geometry types Point Centroid Line Boundary Area (boundary + centroid) face (3D area) [kernel (3D centroid)] [volumes (faces + kernel)] Geometry is true 3D when: x, y, z notinallGIS! Faces GRASS Topological 2D/3D Vector model
  10. 10. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Topological Vector Digitizer
  11. 11. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Topological Vector Digitizer in PostGIS 2 (under development) http://grass.osgeo.org/grass70/manuals/v.out.postgis.html http://grasswiki.osgeo.org/wiki/PostGIS_Topology Programmer: Martin Landa Cofunded by Municipality of Trento, Italy
  12. 12. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense News in GRASS 7's Vector Topology Spatial query example Query of vector point maps GUI: click on vector map, what is there? CLI: v.what east_north=east,north 0 2 4 6 8 10 12 0 120 240 360 480 600 GRASS 6.4.2 GRASS 7 million points seconds
  13. 13. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector network analysis in GRASS GRASS vector network analysis
  14. 14. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Vector network analysis General concept of a network graph ● Arcs connected by nodes ● Forward/backward costs assigned to each arc (oneway road) ● Starting point(s) ● Ending point(s) GRASS vector analysis Cost definition examples ● Distance ● Travelling time ● Travelling costs (fuel, train ticket, etc)  shortest path  fastest path  cheapest path GsoC 2013: implementation of turns support
  15. 15. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Traveling time as costs Result Network analysis: traveling salesman
  16. 16. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Distances as costs Result Network analysis: traveling salesman
  17. 17. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Distances as costs Result Network analysis: allocate subnets … and many more algorithms... see the manual!
  18. 18. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New Space-Time functionality in GRASS 7
  19. 19. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New animation tool for time series http://grass.osgeo.org/grass70/manuals/g.gui.animation.html
  20. 20. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New Map swiping tool for multitemporal maps Pre and post disaster images of the tsunami in Japan in 2011 (MODIS images taken on February 26 and March 13, 2011)
  21. 21. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New geocoding tool Image/Map rectifier For raster (imagery, historic scans) and vector maps
  22. 22. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7 Addons: User contributed extensions http://grass.osgeo.org/wiki/Addons The Addons repository is SVN based: User can easily obtain write access to develop new functionality Installation with extension manager Increasing inflow of Python scripts
  23. 23. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Support for massive spatial datasets in GRASS GIS
  24. 24. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Support for massive datasets What is massive? Massive is relative to Hardware resources Software capabilities Operating system capabilities Limiting factors RAM Processing time Disk space Largest supported file size
  25. 25. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Support for massive datasets Cost surfaces: r.cost 0 1 2 3 4 5 6 7 8 9 10 0 120 240 360 480 600 GRASS 6.4.2 GRASS 7 million points seconds Other speed figure: PCA of 30 million pixels in 6 seconds on this small presentation laptop...
  26. 26. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Main basins New tools for hydrological modelling Distance to the outlet
  27. 27. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Programming own applications with GRASS GIS 7
  28. 28. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS and Python Script part: Parser part (for GUI autocreation and command line support):
  29. 29. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS 7 Python API http://grass.osgeo.org/wiki/GRASS_and_Python
  30. 30. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS 7 Python API http://dx.doi.org/10.3390/ijgi2010201
  31. 31. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7 Programmer's manual http://grass.osgeo.org/programming7/
  32. 32. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS GIS as Open Source GIS backbone: Connecting to other software packages
  33. 33. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense New GRASS and QGIS Integration: Sextante http://grass.osgeo.org/wiki/GRASS_and_Sextante
  34. 34. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense SEXTANTE – GRASS Integration: Modeller Note: Partially functional in gvSIG OADE 2010, more to come in (near) future...
  35. 35. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense QGIS-Sextante – Using GRASS in QGIS via Sextante 1 2 3 http://grasswiki.osgeo.org/wiki/GRASS_and_Sextante
  36. 36. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense QGIS-Sextante – Vector dissolving example Dissolving geometry by string column attributes: Sextante calls GRASS GIS in a virtual session which deliver the result back (here SHAPE file)
  37. 37. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: Native WPS Support
  38. 38. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS and R Integration GRASS 7.0.svn (nc_spm_08_grass7):~ > R R version 3.0.1 (2013-05-16) -- "Good Sport" Copyright (C) 2013 The R Foundation for Statistical Computing Platform: x86_64-redhat-linux-gnu (64-bit) > library(spgrass6) Loading required package: sp Loading required package: XML GRASS GIS interface loaded with GRASS version: GRASS 7.0.svn (2013) and location: nc_spm_08_grass7 > > myrast <- readRAST6(c("geology", "elevation"), cat=c(TRUE, FALSE)) > myvect <- readVECT6("roads") … > writeRAST6(myrast, "elev_filt", zcol="elev") ... http://grass.osgeo.org/wiki/R_statistics
  39. 39. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Visualization
  40. 40. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Visualization: GRASS data export to for Augmented Reality GRASS GIS, Paraview, and ARToolkit
  41. 41. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense http://it.wikipedia.org/wiki/Imaging_a_risonanza_magnetica Our FEM colleague --> Personal comm. A researcher's brain... From MRT scan to Voxels
  42. 42. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  43. 43. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  44. 44. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense A researcher's brain... From MRT scan to Voxels
  45. 45. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: News in Image processing Improved modules: Georectification Orthorectification Atmospheric correction Terrain correction Landsat cloud detection
  46. 46. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Ortho-rectification of aerial images Why using the DEM for image rectification: Incorporating the DEM fixes the rectification problem Linear rectification (insufficient) (Problem commonly seen in Google Earth) Ortho-rectification OK at bottom of valley Wrong in altitude Wrong in altitude Incorporating the DEM fixes the rectification problem
  47. 47. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense GRASS 7: New bivariate Scatterplots LANDSAT 7 2002 channels 1 and 3 of Wake county, NC
  48. 48. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Supervised image classification http://geo.fsv.cvut.cz/~landa/publications/2012/ogrs2012/poster/figures / Tool for supervised classification of imagery data. Generates spectral signatures for an image by allowing the user to outline regions of interest.
  49. 49. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Unsupervised image classification – Segmentation # set comp. region to orthophoto but align pixels to elevation map (for speed reasons in # this demonstrational exercise – for real work please use the true resolution) g.region rast=ortho2010_t792_subset_20cm.blue align=elev_lid792_1m -p # Note: the RGB bands are organized as a group i.segment group=ortho2010_t792_subset_20cm output=ortho2010_t792_subset_20cm_segment goodness=ortho2010_t792_subset_20cm_seg_fit threshold=0.25 Finally vectorize with r.to.vect i.segment - Identifies segments (objects) from imagery data.
  50. 50. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Where is the stuff? GRASS GIS Software: Free download for MS Windows, MacOSX, Linux and source code: http://grass.osgeo.org/download/ Addons (user contributed extensions): http://grasswiki.osgeo.org/wiki/GRASS_AddOns Free sample data: Rich data set of North Carolina (NC) … available as GRASS GIS location and in common GIS formats http://grass.osgeo.org/download/sample-data/ User Help: Mailing lists (also in different languages): http://grass.osgeo.org/support/ Wiki: http://grasswiki.osgeo.org/wiki/ Manuals: http://grass.osgeo.org/documentation/manuals/
  51. 51. ©2013,MarkusNeteler,Italy–CC-BY-SAlicense Markus Neteler Fondazione E. Mach (FEM) Centro Ricerca e Innovazione GIS and Remote Sensing Unit 38010 S. Michele all'Adige (Trento), Italy http://gis.cri.fmach.it http://www.osgeo.org markus.neteler@fmach.it neteler@osgeo.org Enjoy GRASS GIS 7! THANKS! PostGISomics http://grass.osgeo.org http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures
Technology
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