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This page is about work related to GRASS GIS presented at NCGIS2021 (NC GIS 2021 Virtual Conference, North Carolina, USA), February 16-19, 2021 (


Quick Methods for Recreating a DEM when Reprojecting a LiDAR Point Cloud

  • Description: Working with multiple LiDAR collection point clouds across a landscape can require reprojecting the point cloud and rebuilding a DEM for further analysis. It's fairly straightforward to create a DEM from ground points, but there will be holes for buildings and waterbodies where breaklines may not be present to assist in filling in the holes. Using the LiDAR ground point data, it's possible to quickly fill voids using GRASS GIS raster methods, and to identify areas where the technique does not work well and further work is needed.
  • Speakers: Doug Newcomb (USFWS), Stephen Mather (Cleveland Metroparks)

New Major Release of GRASS GIS

Graphical user interface of the upcoming GRASS GIS 8.0.0 release with result of r.valley.bottom tool in 3D
  • Description: GRASS GIS is an all-in-one tool for geospatial analysis and remote sensing made by users for users. GRASS GIS is open source which removes the licensing hassle and cost and puts users to the center of the story. This talk will highlight the new major release of GRASS GIS. Version 8 provides a completely new first-time user experience and streamlines how users interact with their data. New features include dark-themed interface support, Voronoi-based area skeletons, gap filling, near feature attribute statistics, image collection support, customizable solar radiance model, and unlimited fine-scale hydrologic simulation. The new version contains all features from the previous versions including Python 3 scripting, spatio-temporal data analysis, PostgreSQL connections, HPC cluster support, low-end hardware support, and more. Experimental features available for download now include buffer statistics, road centerlines, vector attribute update with Python syntax, coastal, stream, and dam flooding, mass-preserving interpolation, transect generation, longest flow path, iterative subwatershed delineation, edge detection, user and producer accuracies, attribute plots, valley flatness, cost-distance area connectivity, and Sentinel, MODIS, USGS, and GBIF data download. Additionally, issues, fixes, and ongoing improvements are now publicly accessible at GitHub. This talk presents contributions by the whole GRASS GIS user and developer community and highlights additions by the Center for Geospatial Analytics at North Carolina State University.
  • Speakers: Vaclav Petras (NC State University), Anna Petrasova (NC State University)
  • Materials: Slides

Creating Bathymetric Data for a Freshwater Reservoir using Satellite Imagery

  • Description: As part of a habitat assessment for aquatic species in the Roanoke Rapids reservoir, recent bathymetric data was data was needed. The only publicly available bathymetric data was 5 ft contour lines from the historic USGS 7.5’ quadrangle. Using publicly available Sentinel 2 data, depth data from biological sampling locations, lake water level data, and publicly available LiDAR data, a bathymetry layer was created using a combination of GRASS GIS software and the R project statistical software.
  • Speaker: Doug Newcomb (USFWS)


FUTURES v2: Urban Growth Modeling at Scale

FUTURES v2 new development result for USA at 30 m (poster thumbnail)
  • Authors: Anna Petrasova, Georgina Sanchez, Vaclav Petras, Ross K. Meentemeyer

See also