nedhorning 24 research notes and 24 wiki edits | Joined almost 6 years ago

I live and work from a home office in central Vermont but I work for the American Museum of Natural History's Center for Biodiversity and Conservation in New York City. I've been working with remote sensing and GIS for over 25 years and have an interest in photo-monitoring and am a strong proponent of open source software and the citizen science approach to collecting data.










Automating NDVI calibration

by nedhorning almost 4 years ago | 12 | 4,745 views | 8


Using a RAW image to calibrate a JPEG image

by nedhorning almost 5 years ago | 1 | 3,824 views | 4




Improved DIY NIR camera calibration

by nedhorning about 5 years ago | 38 | 9,715 views | 7


Why a red filter should work well for NDVI

by nedhorning over 5 years ago | 12 | 8,560 views | 4


Red vs. blue filters for NDVI

by nedhorning over 5 years ago | 32 | 14,318 views | 5


Calibrating DIY NIR cameras - part 3

by nedhorning over 5 years ago | 17 | 6,052 views | 1


Calibrating DIY NIR cameras – part 2

by nedhorning over 5 years ago | 2 | 4,343 views | 3


Calibrating DIY NIR cameras – part 1

by nedhorning over 5 years ago | 20 | 7,529 views | 1


Balloon mapping of wetlands near Clayton, NY

by nedhorning over 5 years ago | 5 | 5,145 views | 0


Characterizing camera sensors – first step

by nedhorning over 5 years ago | 9 | 4,448 views | 1


Determining Landsat 8 overpass times

by nedhorning almost 6 years ago | 4 | 13,903 views | 4


Dealing with parallax

by nedhorning about 6 years ago | 7 | 4,163 views | 0


White balance and NIR photography

by nedhorning over 6 years ago | 15 | 6,531 views | 2



Software for structure from motion

by nedhorning over 6 years ago | 1 | 13,374 views | 3


Canon A2200 NIR conversion

by nedhorning over 6 years ago | 18 | 10,283 views | 0


Photo monitoring plugin for ImageJ/Fiji

by nedhorning almost 7 years ago | 7 | 5,423 views | 1


Registering and processing photos acquired from two cameras

by nedhorning almost 7 years ago | 9 | 6,214 views | 1


Photo Monitoring Plugin For NDVI using ImageJ

by mlamadrid over 3 years ago | 4 | 2,363 views | 4

New calibration capabilities have been added to the ImageJ/FIJI photo monitoring plugin suite hos...

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How to download and analyze Landsat imagery

by donblair almost 5 years ago | 11 | 3,614 views | 4

This morning, Ned Horning provided a tutorial on downloading Landsat imagery to Cape Cod Baywa...

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Software for mapping trees?

icarito asked about almost 2 years ago

Answers

answered on Jul 14, 2017 1

answered on Jul 14, 2017 1

Show all 2 answers »

"Test images" for multispectral image processing

warren asked about almost 2 years ago

Answers

View these maps at MapKnitter.org »

Title Creation date Image

Comments

Comment Last activity Moderation
"Hi - This recent paper might be helpful: www.mdpi.com/2073-445X/6/2/38/pdf From my experience satellite based surface temperature works best over f..." | Read more » almost 2 years ago
"Hi Suman - Using Analyze => Measure should work. It's not uncommon to have high pixel values for bright targets. In fact if the exposure isn't s..." | Read more » almost 2 years ago
"Hi Suman - The values from 0 - 1 have been scaled from the original image. The reason I do this is that some image pixel values range from 0 - 255 ..." | Read more » almost 2 years ago
"Take a look at Open Data Kit: https://opendatakit.org/. I haven't used it in a couple year but know it's still being supported. " | Read more » almost 2 years ago
"How about testing it on subsets of satellite imagery? You can pick the 3 bands and the band order you want for the testing and can compare that to ..." | Read more » almost 2 years ago
"Hi Jeff - I think I might be able to help with this but I'm not sure what you are looking for. NDVI is simply an algorithm applied to two bands so ..." | Read more » almost 2 years ago
"For calibration I think the most important factor with white balance is that you keep it the same for an entire mission. An advantage to using the..." | Read more » almost 2 years ago
"Hi Suman, I haven't tried applying calibration coefficients in any sort of rigorous way to adjust white balance. All of my calibration work has bee..." | Read more » almost 2 years ago
"Hi Suman, I do not have a peer reviewed manuscript about this work so suggest citing this web page using a style appropriate for websites or blogs...." | Read more » about 2 years ago
"Hi sujayj - I uploaded files with the target descriptions and reflectance information to my Google Drive: https://drive.google.com/drive/folders/0B..." | Read more » about 2 years ago
"Hi jenjimah, Testing any of these and reporting back would be worthwhile from my perspective. One word of caution is that these are very bright re..." | Read more » about 2 years ago
"I do not have any peer-reviewed papers related to this work - sorry. Ned " | Read more » about 2 years ago
"The CSV file for the R script is different form the table in the "Improved DIY NIR camera calibration" post. The CSV file has the reflectance value..." | Read more » over 2 years ago
"Hi Jeff - This should be the image. Let me know if this is ok or if I need to post it some other way Ned " | Read more » over 2 years ago
"Hi kaushalsingh – The three target reflectance values you note seem like a good choice to me. At this point I do not have study material in additi..." | Read more » over 2 years ago
"Hi kaushalsingh – Ait seems as if you are trying to calibrate the image using a reference target before you calculate NDVI? If that assumption is a..." | Read more » over 2 years ago
"Hi - Using 440nm seem reasonable but I'd probably increase the NIR value to 760nm or beyond or something like that since the peak is probably beyon..." | Read more » almost 3 years ago
"Hi David - This is an interesting project. The reflection of the glass should affect the results as long as the reflection is not in the area of yo..." | Read more » almost 3 years ago
"Hi LaPa - You can contact me at horning@amnh.org and I will send you the spectra. You can also look at this research note for links to sites with ..." | Read more » about 3 years ago
"I have the reflectance spectral for these materials and can provide a PDF, Excel, or CSV file of the spectra if someone lets me know a good way to ..." | Read more » about 3 years ago
"Hi Gianni, - We are working on a new python-based version of the plugs and that will have the ability to correct dual-photo setups like yours. It w..." | Read more » about 3 years ago
"Do you know the file format of your images? I appears that ImageJ can't read them. If you send me one pair of images and I'll see if I can find the..." | Read more » about 3 years ago
"Hi peppepegasus - I don't have a package for the Mac at this point since I don't have a Mac. You can try to follow these instructions from a prev..." | Read more » about 3 years ago
"Here are a couple links that should help you get started: https://publiclab.org/wiki/infragram https://publiclab.org/notes/mlamadrid/12-08-2015/pho..." | Read more » about 3 years ago

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