GRASS GIS

Advanced geospatial technologies:

The new powerful GRASS GIS 7.2 release

Vaclav (Vashek) Petras

North Carolina State University
NCSU GeoForAll Lab at Center for Geospatial Analytics

Markus Neteler - Mundialis GmbH &, Co. KG;
Anna Petrasova - NCSU, Helena Mitasova - NCSU

FOSS4G 2017 Boston

Runs everywhere

  • from Raspberry Pi to HPC cluster
  • Linux, Mac, Windows, ...
  • GCC, clang, C, C++98, C++11, C++14

Interface: CLI

The baseline interface for efficiency and reproducibility

Interface: GUI

The interface for beginners and desktop

Tangible Landscape

3rd party tangible user interface to GRASS GIS and Blender

by NC State University, Center for Geospatial Analytics

APIs

  • native:
    • C
    • Python
    • command line
  • 3rd party:
    • R (rgrass7 package)
    • Ruby (grassgis gem)
    • Java (JGrasstools library)
  • as backend:
    • QGIS Processing (Python and R APIs)
    • gvSIG JGrasstools Spatial Toolbox under development

Functionality

  • Hydrology
  • Remote sensing/imagery/image processing
  • 3D rasters, space-time cubes
  • Spatio-temporal
  • Lidar
  • Topological vectors, network analysis
  • Integrated visualizations, 3D visualizations
  • Relational databases (SQLite, PostgreSQL, PostGIS, MySQL)

Return of investment

2002 code running in 2017?

version 5.0 code works as is in 7.2: 
r.mapcalc depr.bin="if((elev - fill)< 0., 1, 0)"

although there is a better way to write it: 

r.mapcalc "depr_bin = if((elev - fill) < 0., 1, 0)"

Command line prevails: 1987

Command line prevails: 2017

Scientific foundation

references to related scientific papers associated with a module

GRASS GIS 7.2

  • Recent releases:
    • 7.2.0 (December 2016) 1,900 commits since 7.0
    • 7.2.1 (May 2017) 150 commits since 7.2.0
  • Upcoming releases:
    • 7.2.2 (summer/fall 2017)
    • 7.4.0 (fall/winter 2017)
    • 8.0.0 (panning started)

New features in 7.2

trac.osgeo.org/grass/wiki/Grass7/NewFeatures72

Data catalog

g.gui.datacatalog - browse and manipulate raster and vector maps

by Tereza Fiedlerova and Anna Petrasova

Simple Python Editor

Create Python scripts and modules with ease

by Vaclav Petras

Vector legend

d.legend.vect - automatic and customizable legends

by Adam Laza and GSoC mentors

Advanced search in command line

g.search.modules - search for modules

by Jachym Cepicky

3D raster flows and gradients

r3.flow - flow lines in a 3D raster
r3.gradient - gradients in a 3D raster

by Anna Petrasova

Simplified batch processing

grass72 /grassdata/nc_spm/work1 --exec \
    r.viewshed input=elevation output=viewshed \
               coordinates=642964,222890

by Vaclav Petras

Temporal Algebra

by Thomas Leppelt and Soeren Gebbert

Other improvements in 7.2

viridis as default color table

Perceptually uniform color table

by Vaclav Petras (following Matplotlib's example)

Links to source code

by Luca Delucchi

Graphical index

by Vaclav Petras; designer needed!

New addons

SLIC

i.superpixels.slic - image segmentation using SLIC superpixels

by Rashad Kanavath and Markus Metz

Supervised classification

r.learn.ml - classification with Python scikit-learn package

by Steven Pawley

Itzï

Hydrologic and hydraulic model of surface water flow

by Laurent Courty

FUTURES

r.futures - set of modules for urban spread modeling

by NC State University, Center for Geospatial Analytics

Parallelized solar radiation

r.sun.mp - parallelized version of r.sun

by Jaroslav Hofierka et al.

Resources

GRASS GIS logo

grass.osgeo.org

Twitter: vaclavpetras
GitHub: wenzeslaus