Jeff W/Chris F are working on this feature for the upcoming Grassroots Mapping Forum. Sourcing a lot from: http://publiclaboratory.org/wiki/dual-camera-kit-guide, images from: http://publiclaboratory.org/notes/warren/5-17-2012/infrared-camera-how-guide-gm-forum Six small features organized around a central large graphic (see above sketch) on an approx 11x17 area. ###1. Science background### * base on Chris' page: http://publiclaboratory.org/wiki/ndvi-plots-ir-camera-kit * Is this your illustration: https://www.flickr.com/photos/jeffreywarren/5416397210/? We could modify that for B&W * NIR by itself looks cool but does not highlight meaningful patterns well. * NRG is false color IR with vegetation in shades of red and pink * NDVI highlights areas of high or low photosynthetic activity ###2. A second camera to capture NIR### * How to modify a camera (YouTube vid, illustrations) * How to mount two cameras * image heavy section... ###3. Triggering the cameras in flight### * **Simple version:** rubber bands or independent intervalometers/CHDK * **Advanced:** Simultaneous triggering makes post-processing much easier * CHDK to enable synchronous remote via USB on Canon Powershots * USB cable mod, MK111 timer ###4. Matching and compositing images### * Synchronize the cameras’ clocks * Capture jpgs * Identify NIR/VIS photo pairs via timestamps * Use Ned’s Fiji macro (requires well-overlapped, sharp photos, and good organizational skills) * Make structure from motion models in Hypr3D * Stitch images in MS ICE or GIMP * Align images over a georeferenced map with MapKnitter **Advanced:** To produce more precise results (link to web page): * Synchronize the cameras’ clocks * Capture RAW, convert to Tiff (need CHDK, big partitioned cards, RAWTherapee (e.g.), big hard drive) * Identify NIR/VIS photo pairs via timestamps * Use Ned’s Fiji macro * Interpret pixel-level results (or almost) * Make structure from motion models in Hypr3D or 123D Catch * Stitch images in MS ICE, GIMP, or Agisoft PhotoScan (allows GPS control) * Align images over a georeferenced map with Mapknitter ###5. Interpretation### * One-time maps can reveal side by side differences in plant growth or health (Lee, NH) * Time series of NDVI can reveal seasonal or year to year trends in plant growth and health (TBD) * examples? ###6. Conclusion### * online resources * how to get involved