nedhorning 24 research notes and 24 wiki edits | Joined about 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.






Photo Monitoring Plugin For NDVI using ImageJ

by mlamadrid over 3 years ago | 4 | 2,835 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 about 5 years ago | 11 | 3,842 views | 5

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

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Seeking DC-area folks interested in building temperature sensors for urban heat island measurement

carohowe asked about about 2 years ago

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Software for mapping trees?

icarito asked about about 2 years ago

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"Test images" for multispectral image processing

warren asked about about 2 years ago

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Detection of heavy metals in plants

JWL asked about over 4 years ago

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View these maps at MapKnitter.org »

Title Creation date Image

Comments

Comment Last activity Moderation
"It's worth testing but those cards you link to look promising. From my experience it's the bright target that is more of a problem than the dark ta..." | Read more » 8 months ago
"Hi Jeff - I wasn't sure if you mean varying over time or over the surface. Over time both will vary but from my experience they seem fairly stable ..." | Read more » 8 months ago
"Yes - the author contacted me shortly before posting the blog " | Read more » over 1 year ago
"For the most part I am not able to reliably and accurately validate NDVI calculations. To validate results you would need to have targets with know..." | Read more » over 1 year ago
"Setting up and running an integrating sphere is within your reach for a 12 week course as long as the equipment is working and you have access to s..." | Read more » over 1 year ago
"Hi dannysmith - I’m glad to hear the note was useful to get you started. I find it helpful to plot both red and blue channel regressions but I expe..." | Read more » over 1 year ago
"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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 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 » over 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 » over 2 years ago
"I do not have any peer-reviewed papers related to this work - sorry. Ned " | Read more » over 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 » about 3 years ago

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