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stevefaeembra<p>Looking at the Stonehenge area with :qgis:</p><p>Multi-scale 'percent elevation range'.</p><p>Computed PER at 51, 17 and 7px radius, combined into R,G,B bands<br>Then applied a contrast stretch</p><p>Helps to highlight barrows and what I suspect are old field patterns?</p><p><a href="https://mapstodon.space/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a> <a href="https://mapstodon.space/tags/WhiteboxTools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WhiteboxTools</span></a></p>
stevefaeembra<p>Trying to take a look at ways to measure contrast and accessibility of maps. </p><p>Here, looking at OpenStreetMap tiles, and contrast</p><p>Used QGIS raster calculator to convert to greyscale (by luminance), then applied the whiteboxtools 'range filter' with a 3x3 kernel</p><p>Colourised with Rocket colour scale. Yellow and white show the highest contrast, black is areas of solid colour.</p><p><a href="https://mapstodon.space/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a> <a href="https://mapstodon.space/tags/WhiteBoxTools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WhiteBoxTools</span></a> <a href="https://mapstodon.space/tags/a11y" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>a11y</span></a></p>
Hans van der Kwast :qgis:<p>📹 Check out my final video of 2024! Learn about custom workflows for stream &amp; catchment delineation in <a href="https://fosstodon.org/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a> with tools from <a href="https://fosstodon.org/tags/GRASS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GRASS</span></a>, <a href="https://fosstodon.org/tags/SAGA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SAGA</span></a>, <a href="https://fosstodon.org/tags/PCRaster" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCRaster</span></a> &amp; <a href="https://fosstodon.org/tags/WhiteboxTools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WhiteboxTools</span></a>.</p><p>🌍💡Discover the benefits of <a href="https://fosstodon.org/tags/OpenSource" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenSource</span></a> tools over proprietary software. <a href="https://fosstodon.org/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a> <a href="https://fosstodon.org/tags/GIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GIS</span></a> <a href="https://fosstodon.org/tags/Hydrology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hydrology</span></a> <a href="https://fosstodon.org/tags/QGISHydro" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGISHydro</span></a><br><a href="https://youtu.be/s57P3GZTOTA" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/s57P3GZTOTA</span><span class="invisible"></span></a></p>
stevefaeembra<p>Day 22 Two colours</p><p>Huascarán, Peru. </p><p>The slope lines were done using a flow accumulation raster (log scale) using <a href="https://mapstodon.space/tags/WhiteBoxTools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WhiteBoxTools</span></a>, draped over mesh and with a threshold filter applied.</p><p><a href="https://mapstodon.space/tags/Blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Blender</span></a> <a href="https://mapstodon.space/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a> <a href="https://mapstodon.space/tags/30DayMapChallenge" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>30DayMapChallenge</span></a></p>
Hans van der Kwast :qgis:<p>Nice to present today on <a href="https://fosstodon.org/tags/qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgis</span></a> for hydrological applications at <span class="h-card" translate="no"><a href="https://fosstodon.org/@foss4geurope" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>foss4geurope</span></a></span> conference in <a href="https://fosstodon.org/tags/Tartu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Tartu</span></a>! I discussed processing provider plugins <a href="https://fosstodon.org/tags/pcraster" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pcraster</span></a> <a href="https://fosstodon.org/tags/grass" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>grass</span></a> <a href="https://fosstodon.org/tags/saga" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>saga</span></a> <a href="https://fosstodon.org/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a> for stream &amp; catchment delineation. <a href="https://fosstodon.org/tags/foss4ge" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>foss4ge</span></a> <a href="https://fosstodon.org/tags/ihedelft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ihedelft</span></a> <a href="https://fosstodon.org/tags/locatepress" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>locatepress</span></a> <a href="https://fosstodon.org/tags/qgishydro" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgishydro</span></a>. Presentation: <a href="https://talks.osgeo.org/foss4g-europe-2024/talk/VES7FV/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">talks.osgeo.org/foss4g-europe-</span><span class="invisible">2024/talk/VES7FV/</span></a></p>
stevefaeembra<p>Edinburgh castle rooftops. Just keeping the apexes (?) and eaves, removing any flat or sloping areas.</p><p>Using <a href="https://mapstodon.space/tags/Qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Qgis</span></a> with <a href="https://mapstodon.space/tags/Whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Whiteboxtools</span></a>, rendered in blender.</p>
stevefaeembra<p>Ward boundaries in the City of <a href="https://mapstodon.space/tags/London" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>London</span></a>. <a href="https://mapstodon.space/tags/Qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Qgis</span></a> and <a href="https://mapstodon.space/tags/Blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Blender</span></a>. Derived from Defra Lidar data, applied <a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a> 'time in daylight' for a skyview-factor like shading.</p>
stevefaeembra<p>Today I accidentally ran <a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a> 'time in daylight' on my 'range filter' layer, rather than the DSM, and I quite liked the results.... <br><a href="https://mapstodon.space/tags/qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgis</span></a> <a href="https://mapstodon.space/tags/mapping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mapping</span></a></p>
stevefaeembra<p>Netherlands has so many interesting town layouts.</p><p>Bourtange, on the border with Germany, is an old bastion fort now containing a village.</p><p>Using AHN4 for DSM, <a href="https://mapstodon.space/tags/Qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Qgis</span></a> and <a href="https://mapstodon.space/tags/Whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Whiteboxtools</span></a> for masks and rasters, <a href="https://mapstodon.space/tags/Blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Blender</span></a> to render. <a href="https://mapstodon.space/tags/Openstreetmap" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Openstreetmap</span></a> used for masking water and building areas.</p><p><a href="https://osm.org/go/0GcWpwtQE-" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">osm.org/go/0GcWpwtQE-</span><span class="invisible"></span></a></p>
Hans van der Kwast :qgis:<p>In this new video, I try to address challenges with stream and catchment delineation in <a href="https://fosstodon.org/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a>. <a href="https://fosstodon.org/tags/QGISHydro" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGISHydro</span></a> <a href="https://fosstodon.org/tags/SAGA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SAGA</span></a> <a href="https://fosstodon.org/tags/GRASS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GRASS</span></a> <a href="https://fosstodon.org/tags/PCRaster" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCRaster</span></a> <a href="https://fosstodon.org/tags/WhiteboxTools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WhiteboxTools</span></a>. <a href="https://youtu.be/pHYIO6beqyI?si=FOZiA8jUmNESANO8" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">youtu.be/pHYIO6beqyI?si=FOZiA8</span><span class="invisible">jUmNESANO8</span></a></p>
stevefaeembra<p>Going for an ascii art look. Jan Mayen, data from Norwegian Polar Institute. Done in :qgis:</p><p>Did a D8 flow pointer in <a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a>. This quantizes downslope aspect to 8 directions</p><p>Create grid in <a href="https://mapstodon.space/tags/qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgis</span></a>. Sample the d8 raster and original dem. Style with 8 different SVG arrow markers rotated around center, using thicker arrows for SE-facing to simulate hillshade. Filter out all the points with 0 elevation to mask out the sea.</p>
stevefaeembra<p>My attempt at a shortcut to doing a relative elevation model. River Coe in Glencoe, Scotland. DEM source <a href="https://remotesensingdata.gov.scot/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">remotesensingdata.gov.scot/</span><span class="invisible"></span></a></p><p>Used <a href="https://mapstodon.space/tags/qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgis</span></a> with <a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a>. Specifically, Elevation Percentile with a kernel radius of 100. This assigns a colour using rank within a 100-pixel radius neighbourhood.</p>
stevefaeembra<p>An <a href="https://mapstodon.space/tags/Edinburgh" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Edinburgh</span></a> DEM, where buildings were removed, just leaving the roads and some flat areas. </p><p>Rendered in <a href="https://mapstodon.space/tags/blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>blender</span></a>. Used the <a href="https://mapstodon.space/tags/qgis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>qgis</span></a> <a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a> algorithm 'MapOffTerrain objects' and QGIS raster calculator to mask the DEM so buildings vanish, leaving just the roads.</p><p>Camera focused on Castlehill, and pivots from facing NW to SW and back again.</p>
stevefaeembra<p>Lundy, <a href="https://mapstodon.space/tags/Blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Blender</span></a> and <a href="https://mapstodon.space/tags/QGIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QGIS</span></a>. </p><p>Zoomed out and close up. Elevation percentile filter in qgis (<a href="https://mapstodon.space/tags/whiteboxtools" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>whiteboxtools</span></a>) to act as a high pass filter to highlight subtle elevation changes. </p><p>Lidar data from Defra.</p>