1 Helena Mitasova, Eric Hardin, Anna Kratochvilova, Martin LandaFrom point clouds to Voxel Models: High Resolution Modeling of Dynamic Landscapes in Open Source GIS: Cape Hatteras example Helena Mitasova, Eric Hardin, North Carolina State University, Raleigh, NC, USA Anna Kratochvilova, Martin Landa Czech Technical University, Prague, Czech Republic AGU 2012 GRASS GIS

2 Shoreline evolution: contoursCape Hatteras dynamics: shorelines 2011 2009 2008 2005 2004 2003 2001 1999 1997 shorelines extracted as 0.5m elevation contours from lidar-based DEMs 200m Cape Hatteras

3 Cape evolution: DEM series 1997-2001rectangles indicate no-data areas 2003 post Isabel

4 Shoreline evolution: animationCape Hatteras dynamics: DEM series animation 2011 2009 2008 2005 2004 2003 2001 1999 1997 200m Cape Hatteras

5 Shoreline evolution from voxel modelCape Hatteras: shoreline evolution as 0.5m isosurface 2011 2009 2008 2005 2004 2003 2001 1999 time[yr] DEMs are stacked into voxel model 200m Cape Hatteras

6 Cape evolution from voxel modelEvolution of contours along dune 2011 2009 2008 2005 2004 2003 2001 1999 post Irene berm? Elevation isosurfaces: 2.5m m different view Cape Hatteras

7 DEM differences NO DATADifference between 2003 post Isabel and 2001, draped over 2001 DEM blue is gain, red is loss, area with rectangles has no-data in 2003

8 Conclusion GRASS7: new tools open for analysis and modeling dynamics of coastal landscapes NCSU OSGeo Research and Education Laboratory: first North American lab in the worldwide network set up under OSGeo-ICA MOU Funding for this research has been provided by US Army Research Office and NC Sea grant GRASS GIS