Public Lab Research note


Results from Aug 25, 2013 Tidmarsh Farms mapping

by warren | August 26, 2013 18:52 | 52 views | 0 comments | #9057 | 52 views | 0 comments | #9057 26 Aug 18:52

Read more: publiclab.org/n/9057


Glorianna Davenport and Gershon Dublon hosted a mapping meetup at Tidmarsh Farms, as part of an ongoing of the area this past Saturday. We did a huge amount of balloon mapping and I wanted to share the results. There are thousands of images, 12GB worth, so I'm going to use the guidelines here to share them via BitTorrent. Here is the link:

magnet:?xt=urn:btih:b22a08e72efc5c353cbe2770e92bfa54b3e38fb2&dn=tidmarsh-26-08-2013

Learn how to download the images here and contact me (via comments) if it doesn't work; I'll keep mine online for a few weeks but after that they'll be harder to get a hold of.

Sorting

I've put the images up on MapMill now, and you can sort them here:

http://mapmill.org/sort/2013-08-26-massachusetts-tidmarsh/

Screen_Shot_2013-08-27_at_6.48.20_PM.png

Processing

We're still figuring out how to post-process these images into NDVI-like data on plant productivity, but most of the work is going on at the infrared discussion list, so join in there. Here are some nice previews and attempts to process NDVI using Infragram Sandbox:

Screen_Shot_2013-08-25_at_8.15.16_PM.png

Screen_Shot_2013-08-26_at_12.05.26_PM.png

IMG_0201.JPG

Infragramming

Standard NDVI didn't work so well on this set, so the above NDVI was a variant using ((R-B)/(R+B)-0.14)*-1440 in the Hue field of the HSV input on Infragram Sandbox. Basically it just heightened the contrasts so you could see differentiation.

http://infragram.org/show/IMG_4198.JPG

Screen_Shot_2013-08-26_at_2.54.20_PM.png

http://infragram.org/show/IMG_4198.JPG

Screen_Shot_2013-08-26_at_2.55.04_PM.png

Update

The Lippincotts, who stopped by to check out the mapping progress (and brought some much-needed supplies like grapes and granola bars -- thanks!) send in some photos as well:

IMG_1606.JPG

IMG_1601-1.JPG

IMG_1583.JPG

Update 2

Here are some more Infragram processed images:

http://infragram.org/show/IMG_0909.JPG

Screen_Shot_2013-08-29_at_12.25.39_PM.png

http://infragram.org/show/IMG_3979.JPG

Screen_Shot_2013-08-29_at_12.26.14_PM.png


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