"Try using DotDotGoose which is an open source tool to assist with manually counting objects in images created by the American Museum of Natural History’s Center for Biodiversity and Conservation (CBC). This purpose-built tool was created since most…"

"MidOpt (http://midopt.com/) sells a dual pass 660/850 (passes red and NIR) filter that from my experience is superior to other filters I have tested. I have a colleague who put one in an S100 and it took a good bit of tweaking to get the focus set…"

"Hi - I haven't used Pix4D but it should be possible to do what you describe as long as you have ground control points. The software can create the point cloud and the points on the ground can be used to translate the point cloud model coordinates to…"

"I think your "making the jump" comment is reasonable as a general rule but it's important to realize it's not a crisp "line" and the choice between a $50 point-and-shoot camera and a several thousand dollar sensor is probably more of a gradient than…"

"I think you would need quality targets, a field spectrometer and a well calibrated and stable sensor so you can record radiance. You would also want to be comfortable using ATCOR and MODTRAN and there is a bit of a learning curve for that. You would…"

"There are already quite a few field sites identified for use for different satellite sensors (the article you reference notes a few) but I'm not certain how well these would work for very high resolution imaging. There could be fine scale spectral…"

"Hi LW -
Imaging under clouds is less than ideal no matter which method you use for normalization. There are some methods that we use for satellite remote sensing to reduce the impact of haze in an image but I've never tried to apply those methods to…"

"LW -  It's probably worth noting that there is temporal and spatial normalization. With temporal normalization the goal is to normalize images so that missions flown at different times (times of the day or days of the year) will have similar…"

"Martin - I (and other folks) have a few notes posted on the Public Labs web site: http://publiclab.org/profile/nedhorning. In my notes I try to explain image calibration and provide some software tools to do the calibration. It's a work in progress…"

"I usually think of normalization as a relative adjustment and calibration as absolute. In other words calibration transforms pixel values to a physical value such as radiance or reflectance and normalization transforms pixel values so they have the…"

"If there is interest in this sort of image normalization I can integrate it into the FIJI photo monitoring plugin. It could be set up as a two-step process similar to what I use for calibration. The first step would be to calculate the band…"

"For the shadow question does it matter what the source is? I would expect NDVI to decrease from a theoretical point of view since red light would tend to scatter more than NIR in the shadow area but I'm sure there are other factors at play…"

"Great stuff – I hate to think I'm partially responsible for the popularity of blue filters. My first NIR camera was a SuperBlue conversion from LifePixel so perhaps I was over zealous at the time. The last couple years or so I've been pushing the…"