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#dronemapping

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Adam Steer<p><span class="h-card" translate="no"><a href="https://fosstodon.org/@qgis" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>qgis</span></a></span> + <a href="https://mapstodon.space/tags/DroneDB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DroneDB</span></a> <a href="https://mapstodon.space/tags/microtootorial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>microtootorial</span></a></p><p>You have some drone images over a transect and want to get the approximate area covered [1]</p><p>Use <a href="https://mapstodon.space/tags/DroneDB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DroneDB</span></a> CLI (<a href="https://docs.dronedb.app/docs/cli" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">docs.dronedb.app/docs/cli</span><span class="invisible"></span></a>) to generate image footprints: </p><p>ddb info ./jpg/*.JPG -f geojson --geometry polygon -o footprints.geojson</p><p>Drop the footprint geojson into QGIS [2]. Dissolve them (Vector -&gt; Geoprocessing Tools -&gt; Dissolve) [3].</p><p>Reproject the result to a CRS in metres (eg UTM) and label with $area [4]</p><p>Done!</p><p><a href="https://mapstodon.space/tags/droneMapping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>droneMapping</span></a> <a href="https://mapstodon.space/tags/FOSS4G" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>FOSS4G</span></a> <a href="https://mapstodon.space/tags/gischat" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gischat</span></a></p>
Adam Steer<p><span class="h-card" translate="no"><a href="https://ecoevo.social/@sarahdalgulls" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>sarahdalgulls</span></a></span> maybe estimate your average image footprint from camera params and height above ground, then rule-of-thumb it. Say your image is 50m along track, you flew at 2m/sec, your images are 5s apart. You're flying 50m every 25 seconds so in a sequence of images 0-5 you can drop image 1, 2,3 and 4 (this is off the top of my head, image 4 might be needed)</p><p>Similar for between lines assuming you flew a grid. Estimate across-track footprint, see what lines can be skipped.</p><p><a href="https://mapstodon.space/tags/dronemapping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>dronemapping</span></a></p>
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