| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Hi Roolark - This sound like an interesting project. I hope you keep us posted with your progress. I think there is a lot of value in pairing Land..." | Read more » | almost 11 years ago | |||
| nedhorning | "Thanks for the suggestion. Maybe a teflon sheet is the way to go although I don't have any experience with these. Some of the thin sheets seem tran..." | Read more » | about 11 years ago | |||
| nedhorning | "I have been making some progress toward standardized calibration targets. Does anyone viewing this know of a source for inexpensive paints/coatings..." | Read more » | about 11 years ago | |||
| nedhorning | "Hi Thorsten, Glad to hear you're making progress. When you run the plugin are you specifying that the channel from the visible image to use for th..." | Read more » | about 11 years ago | |||
| nedhorning | "Hi Hagit, I don't have any research notes related to community mapping. Most of my involvement is peripheral, providing input into methods and hel..." | Read more » | about 11 years ago | |||
| nedhorning | "Hi Hagit, I enjoyed viewing your video and reading this note. I haven't put much thought into a generic work flow. From my limited experience the ..." | Read more » | about 11 years ago | |||
| nedhorning | "Nice work. I'm looking into using VisualSFM to create orthorectified images. They recently added some new geo-referencing features but I haven't ha..." | Read more » | about 11 years ago | |||
| nedhorning | "Is this your conclusion or do we have to test lots of other materials that commonly show up in the NDVI images we take? I have looked at a lot of..." | Read more » | about 11 years ago | |||
| nedhorning | "Chris, So many questions... I think more testing is necessary but I'll take a shot at answering each question. I'd like to hear what other folks th..." | Read more » | about 11 years ago | |||
| nedhorning | "If you use a dual-camera setup I suggest using an unmodified camera and a NIR-pass (visible cutoff) filter for the other camera. Some people use un..." | Read more » | about 11 years ago | |||
| nedhorning | "Hi Thorsten, Sorry for the confusion. Some of the non-linearity between the response of the red and blue filter should be explained in the post I d..." | Read more » | about 11 years ago | |||
| nedhorning | "One drawback of using the red filter is that the red part of the bayer filter passes more NIR than the blue or green parts. I'm looking into ways t..." | Read more » | about 11 years ago | |||
| nedhorning | "I'm curious why you need at least 3 bands for automated classification. I don't have a specific classification task in mind. In general I'm working..." | Read more » | about 11 years ago | |||
| nedhorning | "That's a good observation. The hotspot in these test images would tend to be toward the bottom around the shadow from Chris' head since that's wher..." | Read more » | about 11 years ago | |||
| nedhorning | "If it's sunny tomorrow I'll be out with the wood, tar paper and other things. With a little luck I'll have a research note before the end of the we..." | Read more » | about 11 years ago | |||
| nedhorning | "I got a 3" x 3" Wratten 25A gel filter on ebay for $10. There's a lot left over if you want to try it. " | Read more » | about 11 years ago | |||
| nedhorning | "Chris - It's interesting that you find that the Canon Powershots don't record much NIR in the blue channel. I found just the opposite - that the bl..." | Read more » | about 11 years ago | |||
| nedhorning | "Thanks for your comments. I am rethinking the idea that a blue filter is sensitive to chlorophyll absorption. Blue wavelengths have similar reflect..." | Read more » | about 11 years ago | |||
| nedhorning | "Thanks for the comments Chris. I would be a little cautious drawing more than very broad conclusions at this point. The reflectance values for the ..." | Read more » | about 11 years ago | |||
| nedhorning | "You could try to use some of these for calibration using Landsat imagery to estimate NDVI. " | Read more » | about 11 years ago | |||
| nedhorning | "Thanks for the comments Chris. I might have overstated the influence that different shutter speed, aperture and ISO could affect NDVI but I expect ..." | Read more » | about 11 years ago | |||
| nedhorning | "I have not used the non-pro version but it should perform equally well as far as the stitching goes but my understanding is that it won't handle co..." | Read more » | about 11 years ago | |||
| nedhorning | "The big mosaic was a combination of three different missions. Two were geotagged using GPS coordinates and the third was just images without any co..." | Read more » | about 11 years ago | |||
| nedhorning | "There are gel and glass NIR-block filters that you can buy that do a pretty good job at blocking visible light. There might also be some other free..." | Read more » | over 11 years ago |