mertlresearch @mertlresearch@mastodon.social

After one night of computation, the output of the dense reconstruction is looking good. The next step will be to resample to a uniform sampling distance the get rid of the "shadow" effects.

#skate #diy #sfm #mvs

After a revisit of the spot to collect images to fill some gaps, the sparse reconstruction is looking good.

#skateboard #diy #sfm #mvs

The Viennese high fog has settled, so uniform light is guaranteed. I took this opportunity to take photos from St.Marx DIY, which has grown quite a lot this year. Just started the structure from motion workflow. Let's see if I have captured all important details, or if I have to revisit the site to fill in some gaps.

#skateboard #diy #sfm

Skate hardware is getting rare. No more Spitfire wheels available over here. Hope to avoid flatspots for some time.

Migrated my Jekyll site to the Foundation 6 Framework using the new XY-Grid. No problems, it was a pleasure. Integrated a Vue/Vuex app using leaflet also worked fine.

Visit https://www.mertl-research.at/mss-nrt-map/ for live visualization of the seismicity in the Vienna Basin.

#jekyll #foundation6 #seismic #seismicity #macroseismic #mss

Everyone is streaming...I'm in. I have created m-aar Radio at https://www.mertl-research.at/maar_radio/ which currently streams the sonification of seismic data recorded on a Greenland glacier. 184 days from May to October 2012 resulting in 21 hours and 28 minutes of streaming audio. Tune in and drift into the great white nothing.....

It's great to have control over the output in 5 ns increments. Beaglebone Black PRU and assembly is fun.

Output pulse with 105 ns and 110 ns length triggered by a GPS PPS signal (yellow line).

#beagleboneblack #pru #ruwai #openhardware

Working on a GPS disciplined clock signal for using BeagleBone Black PRUs in my home-office. I'm currently testing the timing performance. The fastest time to set an output GPIO high in response to an input GPS PPS signal is ca. 35 ns using Assembly code.
I didn't code in Assembly for ages, but working directly with all the hardware registers and knowing what every clock cycle does is somehow beautiful.

#ruwai #beagleboneblack #pru #assembly

The earthquake today at 05:24 UTC with an epicenter near #Zagreb and a magnitude of ML = 5.4 (ZAMG) has been detected by the MSS network in the Vienna Basin and marked as an event which might have been felt in a wide area.
The aftershock at 06:01 UTC with a magnitude ML = 4.9 (ZAMG) has been detected as well.

Visit https://www.mertl-research.at/mss-nrt-map/ to get near real-time information about the seismicity in the southern Vienna Basin.

#earthquake #mss #opendata #geoscience

Preparing for the next days. I'm going to redesign my seismic datarecorder Ruwai using the BeagleBone Black PRUs.

https://www.mertl-research.at/projects/ruwai/

#openhardware #seismic #seismograph #beagleboneblack

Working on building two of my open hardware design seismic dataloggers for a short-term deployment in Greenland. Besides building it, I also have to include some hard- and software improvements. Let's see if it works out...
So far, thanks to KiCad 5, the redesign of a power supply PCB has been a joy.

#kicad #ruwai #openhardware #openhardwaredesign #greenland

My book recommendation for these days: "The Masque of the Red Death" by Edgar Allen Poe.

If you ar looking for a contact microphone based on a seismic sensor, check the Geofon by LOM. It's great to pick up low amplitude vibration in solid bodies.

https://store.lom.audio/collections/contact-microphones/products/geofon?variant=29549909442647

#fieldrecording #audio #microphone

Hidden places in the public. These are the areas giving room for new ideas.

#skate #skateboard #architecture #urban

Found a great tool for my lectures. An interactive whiteboard: https://www.openboard.ch. Go and give it a try.

#education #freesoftware

And this one is growing.

My full series on Skateboard Architecture: http://observe.mertl-research.at/skateboard_architecture/

#skate #skateboard #architecture #urban

This one is gone. Official city development has started.

#skate #skateboard #architecture #urban

Cloudy autumn weather is great for beneath the bridges photos. Another skateable pillar.

http://observe.mertl-research.at/skateboard_architecture/

#skate #skateboarding #architecture #urban