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<!DOCTYPE html>
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<!doctype html>
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<html lang="en">
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<head>
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<title>PDXOSGeo</title>
@@ -41,95 +41,201 @@ <h2>Upcoming Meetings</h2>
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<h2>Map of the Month</h2>
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<div class="motm">
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<!-- <img src="./assets/img/motm/earth-day.png" alt="earth day map" /> -->
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<a
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href="https://what-if.xkcd.com/54/"
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>
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<a href="https://what-if.xkcd.com/54/">
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<img
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src="./assets/img/motm/2025-10-xkcd-mars.png"
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alt="Maybe we shouldn't have drained the oceans onto Mars."
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src="./assets/img/motm/2025-10-xkcd-mars.png"
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alt="Maybe we shouldn't have drained the oceans onto Mars."
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/>
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</a>
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</div>
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<p>
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<a
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href="https://what-if.xkcd.com/54/"
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<a href="https://what-if.xkcd.com/54/"
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>What If: We drained the oceans onto Mars?</a
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>
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</p>
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<p>©<a href="https://xkcd.com">xkcd, inc.</a></p>
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</div>
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<div class="main">
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<!-- Upcoming Meeting -->
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<h2>October Meeting - Luke Mitchell-Nelson!</h2>
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<hr />
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<h2>Information Theory Part II:</h2>
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<h2>A Terroir of Landslides!</h2>
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<p class="byline">
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Wednesday 10/15 6:30pm | Hot Lips Pizza @ the Natural
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Wednesday February 25th, 6:30–8pm | Hot Lips Pizza @ the Natural
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Capital Center: 721 NW 9th Ave, Portland OR
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</p>
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<p>
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Please join us this Wednesday for a presentation by Luke Mitchell-Nelson!
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Join us once again on 4th Wednesday (February 25th), to continue the
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conversation with David Percy, aka "Percy" for more of his research on
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applying Reconstructability Analysis (RA) to categorical raster
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datasets. Percy is preparing to defend his dissertation on Spatial
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Reconstructability Analysis, and led us in in a lively discussion in
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January. This month he will share another aspect of his work.
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</p>
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<p>
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In Luke's own words:
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RA is a form of machine learning algorithm (MLA) that works
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exclusively with discrete data, so categorical data such as the
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variables in the SSURGO soils database, the geologic database
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(DOGAMI), and land cover (NLCD) can be used as inputs in their native
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format without conversion to dummy variables, as is typically done in
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other MLAs.
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</p>
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<div class="well">
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I created an interactive web tool that allows users to generate a transit isochrone from any point near Trimet's service area. The web tool uses a flask frontend with a leaflet map and a backend that runs a headless QGIS install and some scripts to do the geoprocessing. It's my first attempt at a web project!
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</div>
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<p>Bring thoughts, ideas, support, and questions!</p>
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<p>There will also be time to discuss the survey results below:</p>
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<div class="well">
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<img src="./assets/img/posts/2025-10/survey_when.png" alt="Which Wednesday to meet" width="100%" />
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<img src="./assets/img/posts/2025-10/survey_where.png" alt="Potential for hybrid attendence" width="100%" />
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<img src="./assets/img/posts/2025-10/survey_what.png" alt="What topics are of interest" width="100%" />
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</div>
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<p>
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As always, there will be Pizza to share, and libations available for purchase from our wonderful hosts, HOTLIPS!
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</p>
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For his February demo, Percy will show how these variables are used
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along with topographic data to model landslide susceptibility in two
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of the counties ranked highest by FEMA for most landslide hazards:
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Lincoln and Tillamook. Percy will show that there is evidence to
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suggest that we can map a Terroir of Landslides, using combinations of
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soil type, geology, elevation,and terrane group, similar to the
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combinations of environmental factors that are used to characterize
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wines, chocolate, and coffee. Results will be presented that show how
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these data are useful in making hazard maps.
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</p>
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<p>
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All of the extraction for analysis was done in QGIS and Python using
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open source GIS libraries
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<a href="https://pypi.org/project/shapely/" target="_blank"
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>Shapely</a
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>
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and
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<a href="https://pypi.org/project/rasterio/" target="_blank"
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>Rasterio</a
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>. Code will be shared and discussed!
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</p>
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<!-- Past Meetings -->
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<p>Zoom link for remote participants: <a href="https://us02web.zoom.us/j/84354140386?pwd=g3gZCAjEZfWxWXFevoizOovOgDizuJ.1" target="_blank">https://us02web.zoom.us/j/84354140386?pwd=g3gZCAjEZfWxWXFevoizOovOgDizuJ.1</a> </p>
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<p>Meeting ID: 843 5414 0386 <br/>Passcode: 166107</p>
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<!-- Past Meetings -->
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<h2 id="past-meetings">
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Past Meetings
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</h2>
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<h2 id="past-meetings">Past Meetings</h2>
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<hr />
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<h2>Happy New Year</h2> <h2>w/ Shapely, Rasterio and Percy!</h2>
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<h2>Happy New Year</h2>
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<h2>w/ Shapely, Rasterio and Percy!</h2>
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<p class="byline">
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Wednesday January 28th, 6:30–8pm | Hot Lips Pizza @ the Natural
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Capital Center: 721 NW 9th Ave, Portland OR
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</p>
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<p> Happy New Year PDXOSGeo! Join us on fourth Wednesday to hear from David Percy, aka "Percy", one of the founders of our group :) Percy has been doing research on applying Reconstructability Analysis (RA) to categorical raster datasets since 2012, and is preparing to defend his dissertation on Spatial Reconstructability Analysis soon.</p><p>RA is a form of machine learning that works exclusively with discrete data, so categorical data such as the <a href="https://www.usgs.gov/centers/eros/science/annual-national-land-cover-database" target="_blank">National Land Cover Database</a> is a perfect source of data for it. Come hear how Percy analyzed NLCD data in attempts to predict forest dynamics (clearcuts), and wildfire size, specifically looking at how historical vegetation affects these outcomes. Results will be presented that show how these data are useful in modeling future events.</p><p> All of the extraction for analysis was done in Python using open source GIS libraries <a href="https://pypi.org/project/shapely/" target="_blank">Shapely</a> and <a href="https://pypi.org/project/rasterio/" target="_blank">Rasterio</a>. Code will be shared and discussed!</p>
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<img src="./assets/img/nlcd.jpg"
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alt="NLCD screenshot" width="100%"/>
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<p>
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Happy New Year PDXOSGeo! Join us on fourth Wednesday to hear from
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David Percy, aka "Percy", one of the founders of our group :) Percy
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has been doing research on applying Reconstructability Analysis (RA)
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to categorical raster datasets since 2012, and is preparing to defend
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his dissertation on Spatial Reconstructability Analysis soon.
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</p>
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<p>
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RA is a form of machine learning that works exclusively with discrete
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data, so categorical data such as the
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<a
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href="https://www.usgs.gov/centers/eros/science/annual-national-land-cover-database"
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target="_blank"
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>National Land Cover Database</a
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>
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is a perfect source of data for it. Come hear how Percy analyzed NLCD
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data in attempts to predict forest dynamics (clearcuts), and wildfire
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size, specifically looking at how historical vegetation affects these
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outcomes. Results will be presented that show how these data are
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useful in modeling future events.
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</p>
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<p>
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All of the extraction for analysis was done in Python using open
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source GIS libraries
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<a href="https://pypi.org/project/shapely/" target="_blank"
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>Shapely</a
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>
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and
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<a href="https://pypi.org/project/rasterio/" target="_blank"
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>Rasterio</a
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>. Code will be shared and discussed!
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</p>
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<img src="./assets/img/nlcd.jpg" alt="NLCD screenshot" width="100%" />
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<hr />
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<h2>Geo-year in Review</h2>
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<p class="byline">
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Wednesday Dec 10th, 6:30–8pm | Hot Lips Pizza @ the Natural
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Capital Center: 721 NW 9th Ave, Portland OR
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Wednesday Dec 10th, 6:30–8pm | Hot Lips Pizza @ the Natural Capital
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Center: 721 NW 9th Ave, Portland OR
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</p>
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<p> Happy Holiday Season! Join us this coming Wednesday for the geo-year in review! Bring us your favorite maps/data visualizations/geo-tidbits from 2025! There are some interesting topics to discuss. </p>
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<p>As always, there will be Pizza! There may also be cookies! Holiday sweaters optional!</p>
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<img src="https://upload.wikimedia.org/wikipedia/commons/e/e8/Holly-161840_1280.png" width="100%"/>
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<hr />
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<p>
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Happy Holiday Season! Join us this coming Wednesday for the geo-year
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in review! Bring us your favorite maps/data visualizations/geo-tidbits
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from 2025! There are some interesting topics to discuss.
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</p>
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<p>
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As always, there will be Pizza! There may also be cookies! Holiday
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sweaters optional!
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</p>
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<img
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src="https://upload.wikimedia.org/wikipedia/commons/e/e8/Holly-161840_1280.png"
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width="100%"
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/>
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<hr />
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<br />
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<h2>October Meeting - Luke Mitchell-Nelson!</h2>
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<p class="byline">
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Wednesday 10/15 6:30pm | Hot Lips Pizza @ the Natural Capital Center:
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721 NW 9th Ave, Portland OR
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</p>
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<p>
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Please join us this Wednesday for a presentation by Luke
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Mitchell-Nelson!
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</p>
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<p>In Luke's own words:</p>
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<div class="well">
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I created an interactive web tool that allows users to generate a
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transit isochrone from any point near Trimet's service area. The web
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tool uses a flask frontend with a leaflet map and a backend that runs
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a headless QGIS install and some scripts to do the geoprocessing. It's
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my first attempt at a web project!
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</div>
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<p>Bring thoughts, ideas, support, and questions!</p>
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<p>There will also be time to discuss the survey results below:</p>
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<div class="well">
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<img
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src="./assets/img/posts/2025-10/survey_when.png"
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alt="Which Wednesday to meet"
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width="100%"
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/>
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<img
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src="./assets/img/posts/2025-10/survey_where.png"
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alt="Potential for hybrid attendence"
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width="100%"
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/>
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<img
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src="./assets/img/posts/2025-10/survey_what.png"
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alt="What topics are of interest"
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width="100%"
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/>
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</div>
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<p>
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As always, there will be Pizza to share, and libations available for
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purchase from our wonderful hosts, HOTLIPS!
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</p>
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<p>
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Zoom link for remote participants:
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<a
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href="https://us02web.zoom.us/j/84354140386?pwd=g3gZCAjEZfWxWXFevoizOovOgDizuJ.1"
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target="_blank"
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>https://us02web.zoom.us/j/84354140386?pwd=g3gZCAjEZfWxWXFevoizOovOgDizuJ.1</a
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>
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</p>
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<p>Meeting ID: 843 5414 0386 <br />Passcode: 166107</p>
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<h2>September Meeting - Show & Tell!</h2>
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<p class="byline">
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Wednesday 9/17 6:30pm | Hot Lips Pizza @ the Natural
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Capital Center: 721 NW 9th Ave, Portland OR
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Wednesday 9/17 6:30pm | Hot Lips Pizza @ the Natural Capital Center:
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721 NW 9th Ave, Portland OR
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</p>
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<p>
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Please join us this Wednesday as we ease back into our regular meeting
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cycle with some loose scheduling and some show and tell! We'll have
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the big screen up and ready to showcase what you've been working on this
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summer. Ease the end-of-summer pain of these darker mornings/evenings
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with some 'topographical' therapy, or just buy a pint next door!
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cycle with some loose scheduling and some show and tell! We'll have
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the big screen up and ready to showcase what you've been working on
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this summer. Ease the end-of-summer pain of these darker
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mornings/evenings with some 'topographical' therapy, or just buy a
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pint next door!
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<br />
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<b>
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Wednesday 9/17 6:30pm | Across the hall from Hot Lips Pizza @ the Natural Capital
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Center 721 NW 9th Ave, Portland OR </b><br />
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Wednesday 9/17 6:30pm | Across the hall from Hot Lips Pizza @ the
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Natural Capital Center 721 NW 9th Ave, Portland OR </b
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><br />
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As always, there will be pizza!
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</p>
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<img

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