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_posts/2013-08-22-balloon-test-at-sea.md

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+---
+date: 2013-08-22 20:57:12+00:00
+description: null
+featuredImage: http://e4e.ucsd.edu/wp-content/uploads/img02-1024x768.jpg
+layout: blog-post
+slug: /balloon-test-at-sea
+title: Balloon Test at Sea
+author: Eric Lo
+categories:
+- stabilized-aerial-camera-platform
+---
+One of the main intended uses of the Stabilized Aerial Camera Platform is to perform surveys of marine mammals. After a successful deployment in Warren Mall, we were ready to test the new setup at sea. Our goals for this deployment were to test the effectiveness of a polarizing filter in getting clear photos of underwater animals, and to validate gimbal stabilization while subjected to jerkiness from the bobbing boat.
+
+<figure>
+<a href="{{'/assets/2013-08-22-img02.jpg' | absolute_url}}"><img src="{{'/assets/2013-08-22-img02.jpg' | resize: '640x480'}}"></a>
+<figcaption>Inflating the balloon</figcaption>
+</figure>
+
+<figure>
+<a href="{{'/assets/2013-08-22-img03.jpg' | absolute_url}}"><img src="{{'/assets/2013-08-22-img03.jpg' | resize: '640x480'}}"></a>
+<figcaption>Walking the balloon to the boat</figcaption>
+</figure>
+
+<figure>
+<a href="{{'/assets/2013-08-22-img04.jpg' | absolute_url}}"><img src="{{'/assets/2013-08-22-img04.jpg' | resize: '640x480'}}"></a>
+<figcaption>Heading out to sea</figcaption>
+</figure>
+
+For this deployment, we were joined by Dr. Brent Stewart of Hubbs SeaWorld Research Institute who wants to use the camera platform for a variety of aerial surveys, and our captains Jim Antrim and Robert Vincent. After securing the balloon to the back of the boat, we set out to sea. Conditions were favorable, with 3-4 foot swells and 10 mph winds. On our way out, we saw a few dolphins pass the boat, but not enough to warrant sending up the balloon; they would be long gone by the time the balloon could be deployed. After about an hour of unsuccessful searching for a sizeable pod of dolphins, we headed up the coast to check out the kelp forest near La Jolla.
+
+The kelp forest provided us with the opportunity to photograph objects below the surface of the water. We used this to test the effectiveness of the polarizing filter, which reduces reflections and glare from the ocean's surface. The filter is most effective when the polarization of the incident light is perpendicular with the polarization of the filter, and decreases in effectiveness as the polarizations align. The following two pictures were taken of the same patch of kelp from different angles; there is a noticeable improvement in visibility when the filter is working effectively.
+
+[![]({{'/assets/2013-08-22-img06.jpg' | resize: '200x300'}})]({{'/assets/2013-08-22-img06.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img07.jpg' | resize: '200x300'}})]({{'/assets/2013-08-22-img07.jpg' | absolute_url}})
+
+Since we didn't get to see marine mammals while out at sea, we went by the bait barge and photographed the sea lions there.
+
+<figure>
+<a href="{{'/assets/2013-08-22-img09.jpg' | absolute_url}}"><img src="{{'/assets/2013-08-22-img09.jpg' | resize: '640x480'}}"></a>
+<figcaption>Sea lions on the bait barge</figcaption>
+</figure>
+
+From this, we created a structure from motion 3D reconstruction with decent results, as seen in the video below.
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/dLnQItXc11A?si=N5xUGyhb1POi4Qpr" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
+
+Overall, the polarizing filter performed well and we were very pleased with how well the stabilization worked, so it was a successful deployment. Our thanks go out to Dr. Stewart, Bob, and Jim for a successful excursion.
+
+[![]({{'/assets/2013-08-22-img11.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img11.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img12.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img12.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img13.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img13.jpg' | absolute_url}})
+
+[![]({{'/assets/2013-08-22-img14.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img14.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img09.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img09.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img02.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img02.jpg' | absolute_url}})
+
+[![]({{'/assets/2013-08-22-img01.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img01.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img15.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img15.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img16.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img16.jpg' | absolute_url}})
+
+[![]({{'/assets/2013-08-22-img05.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img05.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img10.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img10.jpg' | absolute_url}})
+[![]({{'/assets/2013-08-22-img08.jpg' | resize: '150x150'}})]({{'/assets/2013-08-22-img08.jpg' | absolute_url}})
+
+Our next deployment will be in the San Dieguito River Valley Conservancy's Del Dios Gorge, where we will be photographing the progress of replacing non-native invasive plant life as part of a possibly annual study.