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<title>State of GRASS GIS</title>
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<meta name="author" content="Markus Neteler, Veronica Andreo, Vaclav Petras, Anna Petrasova">
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<section>
<h1>State of GRASS GIS</h1>
<p style="margin-top: 0.5em">
<a href="https://www.mundialis.de/en/neteler/">Markus Neteler</a>
<br>
& Verónica Andreo, Vaclav Petras, Anna Petrasova
</p>
<img src="img/grass_gis.svg" alt="GRASS GIS log" class="stretch">
<p><small>FOSS4G 2022 - Florence, Italy</small></p>
<p><small><a href="https://neteler.github.io/grass-gis-talks-markus/foss4g2022.html">neteler.github.io/grass-gis-talks-markus/</a></small>
</section>
<section>
<h2>About the presenter...</h2>
<br>
<ul>
<li>Co-founder and senior consultant at mundialis, Bonn (DE)</li>
<img class="bio-img" src="img/markus_round.png" alt="Pic of Markus Neteler">
<li>PhD in Geography, Univ. of Hannover</li>
<li>Years of researcher's life in Trento, Italy</li>
<li>Since 2016 in Bonn, Germany @ mundialis</li>
<li>Since 1997 active in the <a href="https://grass.osgeo.org/">GRASS GIS</a> project</li>
<li> Co-founder of <a href="https://www.osgeo.org/">OSGeo</a></li>
</ul>
<p align="right" style="font-size:18px"><a href="https://www.mundialis.de/neteler/">https://www.mundialis.de/neteler/</a></p>
</section>
<section data-markdown
data-background-image="https://grass.osgeo.org/images/logos/banner.jpg"
data-background-opacity="0.6">
<textarea data-template>
## Overview of this talk
- Which GRASS?
- Exciting new features in GRASS GIS 8.2
- Code quality and automated releases
- Community contributions
- Get involved
</textarea>
</section>
<section>
<h2>For newcomers: which GRASS GIS?</h2>
<div class="columns">
<div class="column" style="width:59%">
<ul>
<li><b>GRASS GIS</b> (Geographic Resources Analysis Support System), a FOSS suite used for geospatial data management and analysis, image processing, spatial modeling, and visualization.</li>
<li>Originally developed by the U.S. Army CERL for land management and environmental planning (1982-1995).</li>
<li>Founding member of OSGeo (2006)</li>
<li><a href="https://grass.osgeo.org/about/history/">39 years of continuous geospatial development</a></li>
</ul>
</div>
<div class="column" style="width:39%;text-align:center;padding-top:0.5em;">
<img src="img/grass_bday_39.png" alt="GRASS GIS 39th birthday" width="100%">
</div>
</div>
</section>
<!-- skipping the obvious
<section>
<h2>GRASS GIS is about people: Community</h2>
<ul>
<li>
Open community of users and contributors
<ul>
<li>Affiliations: industry, academia, government</li>
</ul>
</li>
<li>Contributions: code, documentation, free support, …</li>
<li>
Project Steering Committee
<ul>
<li>PSC Chair: Verónica Andreo <small>(since February 2021)</small></li>
</ul>
</ul>
<br>
<img src="img/grass_telco_2021-12-29.jpg" alt="GRASS GIS community" class="stretch">
<p><em>Credit goes to the whole community, not just this talk's author.</em></p>
</section>
<section id="GRASS GIS generalities" data-background-image="img/grass_template.png"
data-background-position="bottom"
data-background-size="100% 20%">
<h2>GRASS GIS general features</h2>
<ul>
<li>Free and open source, you can use, modify, improve, share</li>
<li>Large amount of tools: <b>+500</b> <a href="https://grass.osgeo.org/grasss-stable/manuals/full_index.html">core modules</a>, <b>+300</b> <a href="https://grass.osgeo.org/grasss-stable/manuals/addons/">addons</a></li>
<li>Graphical User Interface and command line</li>
<li>C API, Python API and libraries</li>
<li>Interface/connection with R, QGIS, REST API, WPS, etc.</li>
<li>Different data types supported:
<a href="https://grass.osgeo.org/grass-stable/manuals/rasterintro.html">raster</a>
(including <a href="https://grass.osgeo.org/grass-stable/manuals/imageryintro.html">satellite imagery</a>),
<a href="https://grass.osgeo.org/grass-stable/manuals/raster3dintro.html">3D raster or voxel</a>,
<a href="https://grass.osgeo.org/grass-stable/manuals/vectorintro.html">vector</a> and,
<a href="https://grass.osgeo.org/grass-stable/manuals/temporalintro.html">space-time datasets</a>.</li>
</ul>
</section>
<section>
<h2>Interfaces</h2>
<div style="position:relative; width:780px; height:480px; margin:0 auto;">
<img class="fragment fade-out" data-fragment-index="0" width="780" height="480" src="img/qgis_grass_plugin.png" alt="QGIS GRASS plugin" style="position:absolute;top:0;left:0;"/>
<img class="fragment fade-in" data-fragment-index="0" width="780" height="480" src="img/qgis_processing.png" alt="QGIS Processing" style="position:absolute;top:0;left:0;" />
</div>
<p><em>Using GRASS through "Processing" in QGIS</em></p>
</section>
<section>
<h2>Interfaces</h2>
<img src="img/RwithinGRASS_and_Rstudio_from_grass.png" alt="GRASS GIS and R" class="stretch">
<p><em>Using GRASS through R and Rstudio</em></p>
</section>
<section>
<h2>Interfaces</h2>
<img src="img/grass_pyedit.png" alt="GRASS GIS and Python" class="stretch">
<p><em>Python and GRASS</em></p>
</section>
-->
<section>
<h2>All-in-one software suite</h2>
<ul>
<li>All matured tools available right away
<li>Download of experimental tools possible
<li>Network analysis, hydrology, remote sensing, OBIA, time series, …
</ul>
<br>
<img src="img/hexagons_3d_white_outlier.png" alt="GRASS GIS hexagons" class="stretch">
</section>
<section>
<h2>Roadmap</h2>
<ul>
<li>
7.8.7, Feb 2022
<small>Stability and fixes.</small>
</li>
<li>
8.0.0, Feb 2022
<small>New startup, data management.</small>
</li>
<li>
8.0.2, May 2022
<small>Stability and fixes.</small>
</li>
<li>
8.2.0, June 2022
<small>Jupyter, parallel r.neighbors, …</small>
</li>
<!--
<li>
8.3.0, Spring 2023
<small>Single window interface as the default.</small>
</li>
-->
<ul>
<li> major.minor.micro – semantic versioning:</small></li>
<ul>
<li> <small>major (x) brings <b>features and possibly backward incompatible changes</b></small></li>
<li> <small>minor (x.y) brings <b>features and fixes</b>,</small></li>
<li> <small>micro (x.y.z) brings <b>fixes</b>,</small></li>
</ul>
</ul>
<img src="img/splash_screen.png" alt="GRASS GIS splash screen" width="70%">
</section>
<!-- Vero's version:
<section>
<h2>GRASS GIS 8</h2>
<ul>
<li>Roadmap:
<ul>
<li>7.8.6 Fall 2021
<ul>
<li>Old but still good.</li>
</ul>
</li>
<li>8.0.0 Fall 2021
<ul>
<li>First release in a new era.</li>
</ul>
</li>
<li>8.0.1 Winter 2021
<ul>
<li>What did we miss?</li>
</ul>
</li>
<li>8.2.0 Spring 2022
<ul>
<li>Enjoy the GSoC 2021 results!</li>
</ul>
</li>
<li>8.4.0 later in 2022
<ul>
<li>Stability boost!</li>
</ul>
</li>
</ul>
</li>
</ul>
<br>
<img src="img/splash_screen.png" alt="GRASS GIS splash screen" class="stretch">
</section>
-->
<section>
<h1>Exciting new features in GRASS 8.2+</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<!-- too much for FOSS4G 2022
<section>
<h2>Skeletons and Centerlines</h2>
<em>v.voronoi</em> tool can now create area skeletons and centerlines.
<img src="img/lake_skeleton_naip.png" alt="GRASS GIS and vector skeletonising" class="stretch">
<p>by Markus Metz
</section>
<section>
<h2>Latest PROJ and GDAL</h2>
<ul>
<li>Support for PROJ >=6 added.</li>
<li>Support for GDAL >=3 added.</li>
<li>WKT2 can be used for CRS definitions.</li>
<li>High-accuracy coordinate transformations supported.</li>
</ul>
<img src="img/natural_europe.png" alt="natural Europe map" class="stretch">
<p>by Markus Metz</p>
<aside class="notes">
GRASS is currently supporting the latest versions of PROJ and GDAL.
All the fancy new high-accuracy coordinate transformation methods are supported.
The WKT2 can be used to define a CRS and is printed as CRS info by g.proj.
Some new PROJ 8 functionality is not yet supported.
For example, automated download of datum transformation grids is yet missing.
</aside>
</section>
-->
<section>
<h2>Integration of GRASS GIS and Jupyter Notebooks</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<img src="img/gsoc/InteractiveVectorMaps.PNG" alt="GRASS GIS and Jupyter notebooks" class="stretch">
<p>
New Python library that simplifies the launch of GRASS GIS in Jupyter and the interactive display of raster/vector data
</p>
<aside class="notes"> <!-- notes only, not show -->
<ul>
<li>Easy GRASS GIS initialization</li>
<li>More intuitive API for rendering</li>
<li>Classic rendering with d.* commands, rendering with webmap and zooming, also 3D rendering</li>
</ul>
</aside>
<!-- END notes only, not show -->
<p>by Caitlin Haedrich</p>
</section>
<section>
<h2>Integration of GRASS GIS and Jupyter Notebooks</h2>
<ul>
<li>Notebooks: Mix of text, code, results, images, …</li>
<li>Usage: Prototyping, reproducibility, tutorials, …</li>
<li>Now in GRASS GIS: Python functions for easy integration</li>
</ul>
<!--
<img src="img/jupyter_text_images_3d.png" alt="GRASS GIS and Jupyter notebooks" width="33%">
-->
<img src="img/jupyter_interactive_viewshed.png" alt="GRASS GIS and viewshed" width="33%">
<img src="img/jupyter_timeseries_viewshed.gif" alt="GRASS GIS and viewshed time series" width="40%">
<p>
<a href="https://tinyurl.com/grass-rc2">tinyurl.com/grass-rc2</a> (run in Binder)
</p>
<p>by Vaclav Petras, Anna Petrasova, Caitlin Haedrich</p>
</section>
<!-- Jupyter as separate slides
<section>
<h2>New! Integration with Jupyter Notebooks</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<p>
Web map with base maps, zooming, customizations, …
</p>
<img src="img/jupyter_interactive_viewshed.png" alt="GRASS GIS and viewshed" class="stretch">
<p>
<a href="https://tinyurl.com/grass-rc2">tinyurl.com/grass-rc2</a> (run in Binder)
</p>
<p>by Vaclav Petras, Anna Petrasova, Caitlin Haedrich</p>
</section>
<section>
<h2>New! Integration with Jupyter Notebooks</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<p>
Time-series visualization
</p>
<img src="img/jupyter_timeseries_viewshed.gif" alt="GRASS GIS and viewshed time series" class="stretch">
<p>by Vaclav Petras, Anna Petrasova, Caitlin Haedrich</p>
</section>
<section>
<h2>New! Integration with Jupyter Notebooks</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<p>
3D visualization
</p>
<img src="img/jupyter_3d_viewshed.png" alt="GRASS GIS and 3D viewshed" class="stretch">
<p>by Vaclav Petras, Anna Petrasova, Caitlin Haedrich</p>
</section>
-->
<section>
<h2>New! Semantic Labels for Rasters</h2>
<ul>
<li>
assigning meaningful labels to raster maps
<small>(e.g., <code>S2_1</code> or <code>red</code>)</small>
<ul>
<li>image classification can use sematic labels to identify bands</li>
<li>different scenes can then be classified if semantic labels are the same</li>
</ul>
</li>
<li>organize bands within one spatio-temporal dataset</li>
<li>signature files can be used for classification if band references match (raster values are semantically equal)</li>
</ul>
<br>
<img src="img/band_references_scheme.png" alt="GRASS GIS and semantic labels" class="stretch">
<p>by Maris Nartiss, Martin Landa, Markus Metz</p>
</section>
<!-- too much for FOSS4G 2022
<section>
<h2>Faster External Data Links</h2>
<em>r.external</em> links (opens) external raster data (GeoTiffs, …) faster.
<br>
<small>(2-5× faster, or almost no time for some workflows)</small>
<br>
<img src="img/r_external.png" alt="GRASS GIS and external file linking" class="stretch">
<p>by Markus Metz</p>
<p>Great for workflows when only portion of the data is processed in GRASS GIS.</p>
</section>
-->
<section>
<h2>Fast LiDAR data import with PDAL</h2>
<ul>
<li>import of any point dimension (including user defined ones e.g. from PDAL filters)</li>
<li>support of 19 binning methods (including eigenvalues)</li>
<li>point filtering by values in any dimension</li>
</ul>
<img src="img/scan_angle.png" alt="GRASS GIS and LiDAR 1" width="47%"><img src="img/elevation.png" alt="GRASS GIS and LiDAR 2" width="50%">
<p>by Vaclav Petras and Māris Nartišs</p>
</section>
<section>
<h1>More parallelization in GRASS 8.2+</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<section>
<h2>OpenMP parallelization</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<div class="container">
<div class="col">
<ul>
<li>r.series</li>
<li>r.univar</li>
<li>r.neighbors</li>
<li>r.patch</li>
<li>r.resamp.interp</li>
<li>r.resamp.filter</li>
<li>r.mfilter</li>
<li>r.slope.aspect</li>
</ul>
<p> + benchmarking library</p>
</div>
<div class="col">
<img src="img/gsoc/openmp.png" alt="GRASS GIS and openMP" width="70%">
</div>
</div>
<p>by Aaron Saw Min Sern and Anna Petrasova</p>
<p>Available in 8.2+</p>
<aside class="notes">
<ul>
<li>Parallelization of multiple, often used raster modules, with benchmarks.</li>
<li>Especially useful for big data processing</li>
<li>Supported on all platforms, provided GRASS is compiled with OpenMP</li>
</ul>
</aside>
</section>
<!-- other variant
<section>
<h2>New core modules using OpenMP parallelization</h2>
<ul>
<li>r.series: cell value is a function of the corresponding cells in the input maps</li>
<li>r.neighbors: cell value is a function of the cells around it</li>
<li>r.mfilter: cell value is a function of the cells around it</li>
<li>r.slope.aspect: slope, aspect, and other derivatives of an elevation raster</li>
<li>r.patch: mosaic multiple rasters into one</li>
</ul>
<p>
<img src="img/r_series_average_explanation.png" alt="GRASS GIS and r.series openMP benchmarking 2" style="height: 7ex">
</p>
<p>by Aaron Saw Min Sern</p>
</section>
-->
<!-- too much for FOSS4G 2022
<section>
<h2>Speed Improvements: Multi-threading with OpenMP</h2>
<ul>
<li>More tasks done in parallel in the same tool</li>
<li><code>nprocs</code> specifies number of cores (processes, threads)</li>
<li><code>memory</code> specifies RAM in MB</li>
<li><em>Performance</em> section in documentation describes the behavior</li>
</ul>
<img src="img/openmp_r_series_section.png" alt="GRASS GIS and r.series openMP benchmarking" class="stretch">
<p>by Aaron Saw Min Sern and Anna Petrasova</p>
</section>
-->
<section>
<h2>More parallel tools</h2>
<ul>
<li>
Core tools:
<small>
r.sun, v.surf.rst, r.sim.sediment, r.sim.water
</small>
</li>
<li>
Addons tools:
<small>
r.sun.daily, r.in.usgs,
r.mapcalc.tiled, t.rast.what.aggr,
r.connectivity.corridors, r.viewshed.exposure,
and <b>14</b> more
<!-- 20 total -->
</small>
</li>
<li>
Parallelizing custom Python scripts:
<ul>
<li>GridModule <small>(by tile)</small></li>
<li>multiprocessing, ParallelModuleQueue <small>(by task)</small></li>
</ul>
</li>
</ul>
<img src="img/piemonte_shaded_elevation.png" alt="GRASS GIS and Piemonte shaded elevation" class="stretch">
</section>
<!-- nice but too much for FOSS4G 2022
<section>
<h1>Cool stuff that has been there for a while...</h1>
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Noto_Emoji_Pie_1f60e.svg/512px-Noto_Emoji_Pie_1f60e.svg.png" alt="Emoji" width="30%">
</section>
<section>
<h2>64-bit and large file support in all Operating Systems</h2>
<img src="img/big_files.jpg" alt="big files" class="stretch">
<p><b>392 billion cells!</b></p>
</section>
<section>
<h2>Time series support</h2>
<div class="r-stack">
<img class="fragment" src="img/tgrass_flowchart.png" width="70%">
<img class="fragment" src="img/tplot.png" width="70%">
<img class="fragment" src="https://gitlab.com/veroandreo/grass-gis-conae/-/raw/master/assets/img/3month_lst_anim_small.gif" width="70%">
</div>
<p>by Sören Gebbert, Luca Delucchi, Anna Petrasova, …</p>
</section>
<section>
<h2>FUTURES</h2>
<p><em>r.futures</em> - set of tools for urban growth modeling</p>
<p>Improved scalability, new validation modules</p>
<img src="img/FUTURES_addon.png" alt="GRASS GIS and FUTURES urban growth" class="stretch">
<p>by NC State Center for Geospatial Analytics</p>
<aside class="notes">
r.futures is a set of modules for urban growth modeling
based on historical land cover and population data.
New version is more scalable and includes validation modules.
</aside>
</section>
<section>
<h2>PoPS</h2>
<p><em>r.pops.spread</em> - Pest or Pathogen Spread simulation</p>
<img src="img/pops_version_1.png" alt="GRASS GIS and pathogen spread" class="stretch">
<p>by NC State Center for Geospatial Analytics
</section>
<section>
<h2>Tangible Landscape</h2>
<p>Geospatial tangible user interface</p>
<img src="img/cli_tangible.png" alt="GRASS GIS and tangible user interface" class="stretch">
<p>by NC State Center for Geospatial Analytics</p>
</section>
<section>
<h2>Scientific Foundations</h2>
<ul>
<li>references to related scientific papers since its inception</li>
<li>references to papers associated with tools or libraries</li>
<li>tools used in open science</li>
</ul>
<br>
<img src="img/module_references.png" alt="GRASS GIS and module references" class="stretch">
<br>
See: <a href="https://scholar.google.com/citations?user=gJ0ZB0cAAAAJ">GRASS GIS profile at Google scholar</a>
</section>
<section>
<h2>Innovation with stability</h2>
<ul>
<li>Graphical user interface changes as needed.</li>
<li>Python API added in v6, extended in v7.</li>
<li>Basic things continue to work in the same way.</li>
</ul>
<br><br>
<p><em>Raster algebra expression from 2002 (v5) in 2021 (v8):</em></p>
<p>
<code>
depressions<em style="background-color: #f84040;"> </em>=<em style="background-color: #f84040;"> </em>
if((elevation - fill) < 0, 1, 0)
</code>
</p>
</section>
<section>
<h2>Support</h2>
<ul>
<li>Community support
<ul>
<li><a href="https://lists.osgeo.org/mailman/listinfo/grass-user">user mailing list</a> <small>(with vast archives since 1991)</small>
<li><a href="https://gis.stackexchange.com/questions/tagged/grass">GIS StackExchange</a>
<li><a href="https://github.com/OSGeo/grass/discussions">Discussions</a> on GitHub</li>
<li>…
</ul>
<li>Commercial support
<ul>
<li><a href="https://www.mundialis.de/en/open-source-gis/">mundialis</a>
<li><a href="https://www.northrivergeographic.com/">North River Geographic Systems</a>
<li><a href="https://geospatial.ncsu.edu/engage/service-center/">Center for Geospatial Analytics, NC State University</a>
<li>…
</ul>
</ul>
<br>
<img src="img/grass_gis.svg" alt="GRASS GIS logo" class="stretch">
</section>
-->
<section>
<h1>A better GUI experience in GRASS 8.2+</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<section>
<h2>Improved First-time User Experience</h2>
<div style="position:relative; width:640px; height:580px; margin:0 auto;">
<img class="fragment fade-out" data-fragment-index="0" width="640" height="580" src="img/grass78_startup.png" alt="Old start of GRASS GIS 7" style="position:absolute;top:0;left:0;">
<img class="fragment fade-in" data-fragment-index="0" width="640" height="580" src="img/grass78_startup_gone.png" alt="Old start of GRASS GIS 7 no more" style="position:absolute;top:0;left:0;">
</div>
</section>
<section>
<h2>Improved First-time User Experience</h2>
Initial project sets up automatically. Guidance provided for next steps.
<br>
<img class="stretch" src="img/first-time_user_world.png" alt="GRASS GIS 8 welcome">
<p>
by Linda Kladivova &
rest of the community (many reviews, calls, user surveys, …)
</p>
</section>
<section>
<h2>Single-Window GUI</h2>
<h3>Integration of results from Google Summer of Code 2021</h3>
<img src="img/gsoc/proposal3.png" alt="GRASS GIS and single window GUI" class="stretch">
<p>
One GUI window with optimized layout with dockable widgets.
</p>
<p>by Linda Kladivova</p>
<p>Available in 8.2+: <em>Settings > Preferences > General</em></p>
</section>
<!-- too much for FOSS4G 2022
<section>
<h2>Centralized Data Management</h2>
All data manipulation centered around revamped <em>Data</em> tab.
<br>
<img src="img/data_catalog_isolines.png" alt="GRASS GIS and isolines" class="stretch">
<p>by Linda Kladivova, Anna Petrasova, Vaclav Petras
</section>
<section>
<h2>Dark Theme Support</h2>
Interface respects system dark theme.
<br>
<img src="img/dark_theme_v_clip.png" alt="GRASS GIS and dark theme" class="stretch">
<p>by Anna Petrasova, Nicklas Larsson
</section>
-->
<section>
<h1>Code quality and automated releases</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<section>
<h2>Improved and robust code quality checks: GitHub Actions</h2>
<ul>
<li>Python code formatted by Black.</li>
<li>Python code checked against Flake8.</li>
<li>Most of warnings in C code removed and now checked.</li>
<li>Code tested with CodeQL.</li>
<li>Flake8 and Black checks also for Addons.</li>
</ul>
<img src="img/code_in_vscodium.png" alt="GRASS GIS and code editing in VS Codium" class="stretch">
<p>by Nicklas Larsson, Vaclav Petras, Anna Petrasova, Carmen Tawalika, ...
</section>
<section>
<h2>Automated releases from GitHub</h2>
<br>
<h3>Turning git commit entries into a release page</h3>
<ul>
<li>log message parsing, categorization for the subsection</li>
<li>publishing of source code and auto-generated <a href="https://github.com/OSGeo/grass/releases">release notes</a></li>
</ul>
<img src="img/github_grass_releases.png" alt="GRASS GIS and automated software releases" class="stretch">
<p>by Vaclav Petras (procedure support by Markus Neteler)</p>
</section>
<section>
<h1>Selected addons contributed by the community</h1>
<br>
<img src="img/bonn_osgeo_code_sprint_2018.jpg" alt="GRASS GIS code sprint 2018 in Bonn" width="55%">
</section>
<section>
<h2>Spatial Query of Projections</h2>
<em>g.projpicker</em> queries projections spatially using user-drawn geometries and set-theoretic logical operators.
It requires <a href="https://projpicker.readthedocs.io/">ProjPicker</a>.
<br>
<img src="img/g_projpicker_gui.png" alt="GRASS GIS projection picker GUI" class="stretch">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/g.projpicker.html">addon</a>
by Huidae Cho</p>
</section>
<!-- already presented in 2021
<section>
<h2>Weighted layers for dasymetric mapping</h2>
<p><em>r.area.createweight</em> creates a weighting layer for dasymetric mapping using a random forest regression model.</p>
<img src="img/r.area.createweight_out.png" alt="GRASS GIS and dasymetric mapping" class="stretch">
<p>by Charlotte Flasse, Tais Grippa and Safa Fennia. <a href="https://doi.org/10.5194/isprs-archives-XLVI-4-W2-2021-55-2021">DOI.</a></p>
</section>
-->
<section>
<h2>Can you see that landslide??</h2>
<p><em>r.survey</em> allows to assess whether objects of certain size could be detected by an observer moving along roads or sitting on a flying object</p>
<img src="img/r_survey.jpg" alt="GRASS GIS and r.survey" class="stretch">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/r.survey.html">addon</a>
by Ivan Marchesini</p>
</section>
<section>
<h2>Tap directly into FAIR data warehouses</h2>
<h4>GRASS GIS understands netCDF data that follows the CF-convention</h4>
<div class="container_flex">
<div class="column">
<small>
<ul>
<li><a href="https://grass.osgeo.org/grass-stable/manuals/addons/m.crawl.thredds.html">m.crawl.thredds</a>: Lists URLs for netCDF datasets on Thredds servers</li>
<li><a href="https://grass.osgeo.org/grass-stable/manuals/addons/t.rast.import.netcdf.html">t.rast.import.netcdf</a>: Makes Spatio-temporal data in netCDF format directly available for analysis in GRASS STRDS (also without downloading)</li>
</ul>
</small>
</div>
<div class="column">
<img src="img/netcdf_screenshot.jpg" alt="GRASS GIS and netCDF registration" width=100%>
</div>
</div>
<br>
<p>
<small>
Enjoy data delivered right into your GRASS GIS database from e.g.:
</small>
<img src="img/netcdf_sources.png" alt="GRASS GIS and netCDF registration 2" width=100% class="stretch">
</p>
<p><small>
by Stefan Blumentrath (Norwegian Institute for Nature Research - NINA)
</small></p>
</section>
<section>
<h2>Visual Exposure to a Defined Source</h2>
<em>r.viewshed.exposure</em> - Weighted cumulative viewshed analysis defining visual exposure to a source
<br>
<img src="img/r_viewshed_exposure.png" alt="GRASS GIS and viewshed exposure" class="stretch">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/r.viewshed.exposure.html">addon</a>
by Zofie Cimburova and Stefan Blumentrath</p>
</section>
<!-- too much for FOSS4G 2022
<section id="GRASS for Remote Sensing">
<section>
<h1>GRASS loves Remote Sensing</h1>
<br>
<img src="img/grass_image_flyer.png" alt="GRASS GIS and image processing" class="stretch">
</section>
<section>
<h2>Dedicated tools for image processing and analysis</h2>
<div class="columns">
<div class="column" style="width:49%">
<ul>
<li>50+ core modules</li>
</ul>
<img src="img/imagery_core_modules.png" alt="GRASS GIS and imagery modules" width="90%">
</div>
<div class="column" style="width:49%">
<ul>
<li>60+ addons, e.g., OBIA chain</li>
</ul>
<img width="90%" src="https://camo.githubusercontent.com/300a0e87e3ca6b170e8d48e681819e04dafc595c8df3e1caa01aeaaa9bb6d9b8/687474703a2f2f7777772e6d6470692e636f6d2f72656d6f746573656e73696e672f72656d6f746573656e73696e672d30392d30303335382f61727469636c655f6465706c6f792f68746d6c2f696d616765732f72656d6f746573656e73696e672d30392d30303335382d61672e706e67">
</div>
</div>
</section>
<section>
<h2>Sentinel, MODIS, Landsat, NED, NAIP</h2>
<p>
Automated download and import of common datasets
<small>i.sentinel, i.modis, i.landsat, r.in.usgs, r.in.nasadem, …</small>
</p>
<img src="img/usgs_ned_naip_3d.png" alt="GRASS GIS and NED NAIP in 3D" class="stretch">
<p>
<small>
by
Luca Delucchi (Fondazione Edmund Mach),
Martin Landa (OpenGeoLabs),
Anika Weinmann (mundialis),
Guido Riembauer (mundialis),
Roberta Fagandini (GSoC),
Zechariah Krautwurst (GSoC),
Anna Petrasova (NC State University),
Vaclav Petras (NC State University),
Veronica Andreo (CONICET), …
</small>
</p>
</section>
<section>
<h2>GRASS Sentinel Addons</h2>
<br>
<p>
<h4>Access & Downloading → Importing → Preprocessing → Analysis </h4>
<br>
<img src="img/example_s2_imagery.png" alt="GRASS GIS and Sentinel-2 scene" class="stretch">
<p><font size="1">Contains modified Copernicus Sentinel data (2021)</font></p>
</section>
<section>
<h2>Access & Downloading</h2>
<ul>
<li><b><em>i.sentinel.coverage</li>
<li>i.sentinel.download</b></em>
<ul>
<li>ESA Copernicus Open Access Hub</li>
<li>USGS Earth Explorer</li>
<li>Google Cloud Storage</li>
</ul>
</ul>
<br>
<img src="img/s2_search_and_download.gif" alt="GRASS GIS and Sentinel-2 download" class="stretch">
</section>
<section>
<h2>Importing</h2>
<ul>
<li><b><em>i.sentinel.import</b></em>
<ul>
<li>selection of individual bands</li>
<li>import of metadata, band reference, cloud masks</li>
</ul>
<li><b><em>t.sentinel.import</b></em></li>
<li><b><em>r.s1.grd.import</li></b></em>
</ul>
<br>
<img src="img/s2_in_grass.png" alt="GRASS GIS and Sentinel-2" class="stretch">
</section>
<section>
<h2>Importing</h2>
<ul>
<li>Importing into a space-time raster dataset with <b><em>t.sentinel.import</b></em>
</ul>
<br>
<img src="img/s2_importing_strds.gif" alt="GRASS GIS and S2 time series import" class="stretch">
</section>
<section>
<h2>Preprocessing</h2>
<ul>
<b><em><li>i.sentinel.mask</li>
<li>t.sentinel.mask</li>
<li>i.sentinel.preproc</li>
<li>i.sentinel-2.sen2cor</li>
<li>t.rast.mosaic</li>
<li>i.sar.speckle</li></b></em>
</ul>
</section>
<section>
<h2>Preprocessing: cloud masking with <b><em>i.sentinel.mask</b></em></h2>
<br>
<img src="img/cloudmasking.png" alt="GRASS GIS and S2 cloud masking" class="stretch">
</section>