bitsmithy.net

In the world of academic tomography codes, Colin Zelt’s FAST is one of the most well-known and widely-used. This is for good reason, since it works well, it has been thoroughly tested, and it’s written in pure Fortran (i.e. it’s fast). It’s so widely used, in fact, that I think the argument can be made that it’s more standardized (in the academic world) than the integrated seismic processing suites like ProMAX (or GLOBE Claritas!). When collaborating with other researchers, it’s nice to share first-arrival picks, but emailing a ~60GB SEG-Y file doesn’t … Continue Reading

I’m currently designing a motor interface board to go between the various XMOS development boards and the Pololu Dual MC33926 Motor Driver Carrier. These are the initial board designs, though I haven’t fully decided whether to include the connections to the XMOS 5V0 and 3V3 lines.

Also note that the autorouter got a little crazy in some places trying to make this work with only 2 layers. There are some places that need cleaning up (e.g. the 3V3 line near the right-hand side).

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3V3 Regulator
Recom R-783.3-1.0

5V0 Regulator
Recom … Continue Reading

I’ve been playing with Subversion; quite a handy tool. I have used CVS in the past, but I like that Subversion feels much cleaner. To me it’s very much the standard these days. Some colleagues with whom I’m collaborating have a repository, and I feel like I’ve been over-using the commit / comment function.

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There’s a lot of similarity between the seismic imaging problem and ultrasound; the difference is for the most part a matter of scale. In some recent work, researchers brought exploration seismic imaging techniques to the medical ultrasound world with some success. Continue Reading

I’m really liking the looks of the Texas Instruments ez430-Chronos development kit in watch form. The biggest impediment is my MacBook; last year’s switch to Mac OS has been okay for most things, but especially with EE related tools, I find there is often no Mac OS support. It’s slightly ironic that I switched away from Linux after years of exclusive use on the desktop, just when everyone started supporting it.

Regardless, TI seems to have put together a really interesting platform. I’d be even more excited if it ran via bluetooth, but I understand that the power consumption and cost … Continue Reading

So it turns out it absolutely is possible to approximate a cosine squared taper in Seismic Unix. The trick is to do a sine or cosine taper, square the whole thing, and then divide by the original.

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I want to take two velocity models stored as SEG-Y and blend them together. It doesn’t strike me as all that strange a request, but I have yet to find a processing package (that we have) that can do it.

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It’s been a little while since I had this website online; we’ll see how long it lasts!