Spectralworkbench Blog


OS Geo Live Boot DVD/Thumb Drive

by mathew | about 12 years ago | 0 | 0

I believe several applications on here are server apps running on localhost. Its potentially a framework for us to create a local, bootable system for running our web tools. Found it via visiting PDX Open Geo.

From the Site: OSGeo-Live is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Xubuntu, that allows you to try a wide variety of open source geospatial software without installing anything. It is composed entirely of free software, allowing it to be freely distributed, duplicated and passed around.

It provides pre-configured applications for a range of geospatial use cases, including storage, publishing, viewing, analysis and manipulation of data. It also contains sample datasets and documentation.

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Configure Spectralworkbench???

by Tom_H | about 12 years ago | 2 | 0

If you click on the configure button of spectralworkbench a slider appears that allows you to adjust a number. What does that number represent?

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intensity calibration

by Tom_H | about 12 years ago | 29 | 0

Is there a way to use the "spectralworkbench" to calibrate spectrometers for intensity variations across the accessible spectral range. In more detail; the sensitivities of the RGB pixels on a webcam are adjusted so that the resultant image matches what a person sees; the eye is most sensitive in the green with falloff at higher and lower wavelengths. Ideally a spectrometer should be equally sensitive to all wavelengths, and it should be possible to develop a calibration method that adjusts the spectral intensities from what the webcam delivers to a more uniform wavelength vs. sensitivity profile.

Is there already a way to do this with "spectralworkbench" or is there someone who knows how to do this?

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Spectral Workbench updates: profile page fix & sample row selection

by warren | about 12 years ago | 0 | 0

Many folks have been uploading images of spectra but the website was not specific about where it was going to take a slice to graph. Now there's a note on the upload page. This will be helpful for spectra like:

However, even more convenient (although still pretty shabby in interface) is the button you'll see below your spectra now which lets you "set sample row". This has a terrible interface but we'll be revising the whole spectrum view page for a new "analysis page" soon -- the important part is that you can enter a row # and it will sample your image at that # of rows from the top. So the following spectrum suddenly has data, whereas before it was reading the black data from the top row of the image:

I also fixed the profile page link and made some other small tweaks, including adding a blog link to the top, which just leads to the Public Lab website and shows all research notes tagged with "spectralworkbench". That way I can write updates here.

I haven't had a lot of time to write code recently but don't worry, we have a lot of big plans for the software and things should be getting much easier as we go!

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Matching olive oil spectra in SpectralWorkbench

by warren | over 12 years ago | 3 | 0

Very exciting, though definitely experimental -- while working last week at Mediamatic in Amsterdam, I managed to implement basic spectral matching, which finds the closest spectrum to any new spectral reading you take. Here's a video showing it correctly distinguishing between 2 types of olive oil:

Sadly, the just-released Chrome 20 breaks my code, so it'll be a day or two before I get this running again there. But you can definitely do this with Opera or Opera Mobile for Android.

Update: Chrome 21, just out last week, is much more reliable, and I updated the code so now it works very well! It also has a "waterfall" display which makes measurements much easier.

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