Friday, September 30, 2011

Korean Four Rivers filmakers visit LRRD


We build our Emriver models to help students and stakeholders understand complex river behavior.

Anywhere in the world.

Today we hosted documentary producer Sahoon Hong and his cameraman Seong Rim Lee from the Korean Broadcasting System (KBS), the South Korean equivalent of our PBS.  

They’re investigating the controversial $17B Four Rivers Project, summed up in this Science article

Using our Emriver Em4, we demonstrated how river manipulations like wing dikes and dredging change river morphology; I hope we'll inform river engineering and management on this project half way around the world.

Thursday, September 8, 2011

Fluvial Photography at LRRD

By Alee

Alee teaches Lily to use the GigaPan
Over the past couple weeks, I've been testing out our new GigaPan Epic Pro system, which is a robot that guides a camera to take nearly perfect panoramic pictures.  The GigaPan software stitches the photos together, and you end up with an extremely detailed shot, which you can then zoom in to see fantastic detail.

We picked it up because we think it will be a powerful tool to use with our Em4 model, especially in conjunction with close range photogrammetry (CRP).

Last week I photographed the Em4 during and after a delta-building run, and you can see the images here.  Zoom in to see fluvial features formed during the run.

Our Ecohydrologist, Lily Hwang, has also started testing the photos taken with the GigaPan with CRP.  We think we can use these pictures to build point clouds, which will be more accurate and efficient than taking all of them the old-fashioned way.  We hope to have some results soon.

I've also been experimenting with ImageJ image processing and analysis software.  ImageJ offers a ton of plugins to aid analysis, and I'm hoping to use one that maps the amount of color in a photo to study our color coded modeling media.
Color coded modeling media in the Em4
Graph showing RGB values in a portion of the
photo to the left, made using the Color Inspector 3D
plugin for ImageJ

Tuesday, September 6, 2011

Emriver Em4 coded media and CRP updates.

Draft, delta building and stratigraphy, Emriver Em4 model. from Steve Gough on Vimeo.

We are moving fast with our Em4 work, partly in preparation for GSA in Minneapolis, where I'll be giving a talk about use of color coded by size (CCS) media and also Close Range Photogrammetry (CRP).  We're also now trying out a Gigapan system.

Here you can see the draft video of a run last week in which we built a delta.  We lowered base level (the standpipe) to cut channels through it, and then sliced it to show various stratigraphy.  I'm very happy with the results!  The music is just a placeholder, if it bothers you, turn it down, there is no narration.

You'll find a Gigapan of the sliced sediment here:

And here's an older video showing details of the CCS.  Note that we're experimenting with a finer red colored fraction added since this video was made.