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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://geomatics.fsv.cvut.cz/en/employees/ing-martin-landa-ph-d/">Martin Landa</a>
<br>
& Markus Neteler, Verónica Andreo, Vaclav Petras, Anna Petrasova, Ondrej Pesek, Linda Karlovska
</p>
<img src="img/grass_gis.svg" alt="GRASS GIS log" class="stretch">
<p><small>FOSS4G 2023 - Prizren, Kosovo</small></p>
<p><small><a href="https://ctu-geoforall-lab.github.io/grass-gis-talk-foss4g-2023/foss4g2023.html">ctu-geoforall-lab.github.io/grass-gis-talk-foss4g-2023/</a></small>
</section>
<section>
<h2>About the presenter...</h2>
<br>
<ul>
<li>Department of Geomatics, Faculty of Civil Engineering,<br/> Czech Technical University in Prague (CZ)</li>
<li>PhD in Geodesy and Cartography
<li>FOSS4G enthusiasts, a freelance programmer</li>
<li>Since 2003 active in the <a href="https://grass.osgeo.org/">GRASS GIS</a> project
<img src="img/landa_contribution.png" alt="Contribution to GRASS GIS" width="45%">
<img class="bio-img" src="img/landa.png" alt="Pic of Martin Landa">
</li>
</ul>
<p align="right" style="font-size:18px"><a href="https://geomatics.fsv.cvut.cz/en/employees/ing-martin-landa-ph-d/">https://geomatics.fsv.cvut.cz/employees/landa</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
- What is GRASS GIS?
- Exciting new features in GRASS GIS 8.3
- Community contributions
- Get involved
- GRASS celebrated 40(!) in Prague
</textarea>
</section>
<section>
<h2>For newcomers: what is 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/"><b>40 years</b> of continuous geospatial development</a></li>
</ul>
</div>
<div class="column" style="width:39%;text-align:center;padding-top:0.3em;">
<img src="img/Prague-Community-Meeting-2023-crop.jpg" alt="GRASS GIS Community Meeting 40th birthday" width="100%">
<br>
<img src="img/grass40.png" alt="GRASS GIS 40th 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, vector topology, time series, …
</ul>
<br>
<img src="img/grass821.png" alt="GRASS GIS 8.2.1" class="stretch">
</section>
<section>
<h2>Roadmap</h2>
<ul>
<li>
<font color="grey">8.2.0, Jun 2022
<small>Presented on FOSS4G 2022.</small></font>
</li>
<li>
8.2.1, Jan 2023
<small>Stability and fixes.</small>
</li>
<li>
<b>8.3.0, Jun 2023</b>
<small>Single window interface as the default.</small>
</li>
<ul>
<li> major.minor.micro – semantic versioning:</small>
<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>
<li>RFC: <a href="https://github.com/OSGeo/grass/blob/main/doc/development/rfc/version_numbering.md">Version Numbering</a></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 8.3+</h1>
<i class="fa fa-rocket fa-4x"></i><br>
<p><a href="https://grass.osgeo.org/news/2023_06_24_grass_gis_8_3_released/">GRASS 8.3.0 news</a></p>
</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>Soil line slope support for vegetation indices</h2>
<p>
Adding the possibility to define the soil line slope for indices in <em>i.vi</em>.
<p>
<img src="img/2023/pvi_soil_080.png" alt="PVI with soil line slope 0.80" width="45%">
<img src="img/2023/pvi_soil_099.png" alt="PVI with soil line slope 0.99" width="45%">
<p>
In the picture: Comparison of PVI computed with soil line slope 0.80 (left) and 0.99 (right).
</p>
<aside class="notes"> <!-- notes only, not show -->
<ul>
<li>Already was there for some indices, just adding its support to more</li>
</ul>
</aside>
<!-- END notes only, not show -->
<p>by Ondrej Pesek</p>
</section>
<section>
<h2>PyWPS export in GRASS GIS modeler</h2>
<img src="img/2023/g_gui_gmodeler_model_avg.png" alt="gmodeler model" width="37%">
<img src="img/2023/pywps_logo.png" alt="PyWPS logo" width="10%">
<img src="img/2023/g_gui_gmodeler_pywps_code.png" alt="PyWPS export" width="37%">
<p>
Automatic export of GRASS GIS models as PyWPS scripts. More info in the <a href="https://grass.osgeo.org/grass83/manuals/g.gui.gmodeler.html">documentation</a>.
</p>
<aside class="notes"> <!-- notes only, not show -->
<ul>
<li>Good for people wanting to hold a PyWPS server but having no experience with PyWPS</li>
<li>Supports also parameterization and complex inputs/outputs</li>
</ul>
</aside>
<!-- END notes only, not show -->
<p>by Ondrej Pesek</p>
</section>
<section>
<h2>Improved Jupyter Notebooks integration</h2>
<p>Python library <em>grass.jupyter</em> for easy and interactive visualization
in Jupyter notebooks.</p>
<img src="img/jupyter_timeseries_viewshed.gif" alt="GRASS GIS and viewshed time series" width="40%">
<img src="img/jupyter_interactive_viewshed.png" alt="GRASS GIS and viewshed" width="33%">
<ul>
<li>more stability fixes</li>
<li>used in several new workshops and tutorials,
<small>e.g.<a href="https://github.com/ncsu-geoforall-lab/grass-gis-workshop-foss4g-2022">
github.com/ncsu-geoforall-lab/grass-gis-workshop-foss4g-2022</a></small></li>
<li>new <em>SeriesMap</em> for animated raster/vector series in
<a href="https://github.com/OSGeo/grass/pull/3036">PR 3036</a></li>
</ul>
<p>by Caitlin Haedrich, Vaclav Petras, Anna Petrasova</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>
-->
<!-- already presented FOSS4G 2022
<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>
<br><b style='color:red;'>TODO: replace by new content</b>
</section>
-->
<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>Streamlined C and C++ code maintenance</h2>
<ul>
<li>All GCC -Wall -Wextra warnings fixed</li>
<li>Clang-Format applied</li>
<li>Warnings and formatting checked in CI</li>
</ul>
<img src="img/2023/code_in_qtcreator.png" alt="code in qt creator" class="stretch">
<p>by Nicklas Larsson</p>
</section>
<section>
<h1>More parallelization in GRASS 8.3</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<section>
<h2>New in GRASS GIS 8.3</h2>
<div class="container">
<div class="col">
<p style="text-align:left">Parallel C tools (OpenMP)
<ul>
<li>r.univar</li>
<li>r.resamp.interp</li>
<li>r.resamp.filter</li>
</ul>
<p style="text-align:left">Parallel Python tools
<ul>
<li>t.rast.univar</li>
<li>t.rast3d.univar</li>
</ul>
</div>
<div class="col">
<img src="img/gsoc/rneighbors_openmp.png" alt="GRASS GIS and openMP" width="80%">
</div>
</div>
<p>+ fixes in other parallel tools and benchmarks</p>
<p>by Aaron Saw Min Sern, Stefan Blumentrath and Anna Petrasova</p>
</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.series, r.neighbors, r.patch, r.mfilter, r.slope.aspect, r.sun, v.surf.rst, r.sim.sediment, r.sim.water
</small>
</li>
<li>
Addon 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>Data parallelization: GridModule</li>
<li>Task parallelization: multiprocessing, ParallelModuleQueue</li>
</ul>
</li>
</ul>
<img src="img/parallel_tools.png" alt="Data and task based parallelization" 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</h1>
<i class="fa fa-rocket fa-4x"></i>
</section>
<section>
<h2>Improved First-time User Experience in <b>GRASS 8</b></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 in <b>GRASS 8</b></h2>
Initial project sets up automatically. Guidance provided for next steps.
<br>
<img class="stretch" src="img/2023/first_time_user.png" alt="GRASS GIS 8 welcome">
<p>
by Linda Karlovska &
rest of the community (many reviews, calls, user surveys, …)
</p>
</section>
<!-- too much for FOSS4G 2023
<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>Single-Window GUI in <b>GRASS 8.2+</b> </h2>
<ul>
<li>One GUI window with optimized layout with dockable widgets.</li>
<li><font size="+3"><b>Default in 8.3+</b></font></li>
<li>Many improvements and fixes to support various platforms</li>
</ul>
<img src="img/2023/single_layout.png" alt="GRASS GIS and single window GUI" class="stretch">
<p>by Linda Karlovska</p>
</section>
<section>
<h2>Improving Single-Window GUI user experience - GRASS mini project 2023 </h2>
<ul>
<li>Undocking map display notebook page</li>
<li>New layout of the Console pane</li>
</ul>
<img src="img/2023/undocked_map_display.png" alt="Undocked map display notebook page" class="stretch">
<p>by Linda Karlovska</p>
</section>
<section>
<h2>Dark Theme Support</h2>
<ul>
<li>Interface respects system dark theme.</li>
<li>New: fixes for Graphical Modeler</li>
</ul>
<br>
<img src="img/dark_theme_v_clip.png" alt="GRASS GIS and dark theme" class="stretch">
<p>by Anna Petrasova, Nicklas Larsson, Martin Landa
</section>
<!-- already presented FOSS4G 2022 -->
<!--
<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, ...
<br><b style='color:red;'>TODO: replace by new content</b>
</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>
<br><b style='color:red;'>TODO: replace by new content</b>
</section>
-->
<section>
<h1>Selected addons contributed by the community</h1>
<br>
<img src="img/grass_community.jpg" alt="GRASS GIS Meeting 2023 in Prague" width="75%">
</section>
<section>
<h2>Hydro-flattening a DEM</h2>
<em>r.hydro.flatten</em> derives single elevation value for water bodies
based on lidar data.
<br>
<img src="img/hydro-flatten.png" alt="hydro-flattened DEM" class="stretch">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/r.hydro.flatten.html">addon</a>
by Anna Petrasova</p>
</section>
<section>
<h2>Random walk simulation</h2>
<em>r.random.walk</em> generates a 2D random walk with multiple parallel walkers and different walker's behavior.
<br>
<img src="https://grass.osgeo.org/grass-stable/manuals/addons/r_random_walk_example.png" alt="example" width="45%">
<img src="https://grass.osgeo.org/grass-stable/manuals/addons/r_random_walk_example_2.png" alt="example" width="45%">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/r.random.walk.html">addon</a>
by Corey White</p>
</section>
<section>
<h2>Boxplots in space-time raster data set</h2>
<em>t.rast.boxplot</em> draws boxplots of the raster in a
space-time raster data set.
<br>
<img src="img/t_rast_boxplot_02.png" alt="t.rast.boxplot example" width="45%">
<img src="img/t_rast_boxplot_03.png" alt="t.rast.boxplot example" width="45%"> <p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/t.rast.boxplot.html">addon</a>
by Paulo van Breugel</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>Thredds Data Server</h2>
<p><em>m.crawl.thredds</em> crawls the catalog of a Thredds Data
Server (TDS) starting from the catalog-URL. It is a wrapper module
around the Python
library <a href="https://github.com/ioos/thredds_crawler">
thredds_crawler</a>.</p>
<img src="img/m_crawl_thredds.png" alt="m.crawl.thredds" class="stretch">
<p><a href="https://grass.osgeo.org/grass-stable/manuals/addons/m.crawl.thredds.html">addon</a>
by Stefan Blumentrath</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>
<br><b style='color:red;'>TODO: replace by new content</b>
</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>
<br><b style='color:red;'>TODO: replace by new content</b>
</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>