Wednesday, December 14, 2016

Bartlett Site

As part of our field trip last weekend we visited a BLM site just off of the DeBinky Wells Road north of Dead Horse Point and Canyonlands near Moab.  This is a fairly well-known site, and you can find directions at this url.  The site is located in an alcove and contains some pretty impressive Barrier Canyon style pictographs.  It's well worth a visit if you are passing by.

Monday, December 12, 2016

DeBinky Wells Road Site

This past weekend Yeongmi and I went on a field trip with URARA down in Moab.  We only caught the first day, but what sights we saw!  My favorite was the very last site of the day, off DeBinky Wells Road, north of Dead Horse Point and the Island in the Sky section of Canyonlands.  Dennis DeVore led us to the site and it was amazing.  Since this site is not well known and unvandalized, I am not posting any specific location information and the photos posted have no GPS information attached.

Most of the Panel in DStretch using the LDS filter

Friday, October 7, 2016

Using Structure-from-Motion (SfM) for Rock Art

One of the coolest presentations from last week's URARA symposium in Delta was the one by Robert Mark and Evelyn Billo on using photographs to generate 3D models of rock art sites.  The technology is closely related to that used with Microsoft's Photosynth program which I wrote about in my blog a few years ago.  However, while Photosynth allows you to zoom around and view a site from the point of view of each camera shot, the tools that Mark and Billo were talking about allow you to actually reconstruct the site as a 3D mesh and overlay the information from the photos as a texture using the same technology.  This is really cool.

Pictograph Panel on Black Rock Mesa
To test this out, I took a series of photos of the boulder above which we visited on the Monday URARA field trip.  I got it from three or four different angles and shot it in close up sections.  I then input these images into two programs.  1) Agisoft Photoscan, which is the program that Mark and Billo talked about at the symposium, and 2) Autodesk ReMake, which I found online.  Photoscan has a free 30-day trial and seems to generate better results, but it costs $179 for the basic version.   ReMake runs the analysis on the cloud and can be much faster, but costs $30 per month once the trial version expires.

Below is a clip of the model that ReMake generated in the form of a quick movie.

The Photoscan-generated model can be viewed at this link.

Here are the same photos at Photosynth.

Monday, October 3, 2016

URARA 2016 Symposium

I just go back from my first attendance at the Utah Rock Art Research Association (URARA) annual symposium.  This year it was held in Delta, Utah.  It was one of the funnest experiences I've had in a long time.

Sheep from Miller Canyon

Sunday, September 18, 2016

Nine Mile Canyon

The Pregnant Buffalo
This past weekend I took my first field trip with the Utah Rock Art Research Association (URARA) and got to see some of the rock art at Nine Mile Canyon.  The trip was every bit as spectacular as I had been lead to believe it would be.  The rock art is so extensive there it would take years to see it all, but I did get a good sampling of many of the well-known sites and quite a few of the lesser-known ones as well.

Monday, September 12, 2016

Parowan Gap

"The Zipper" at Parowan Gap
This past Saturday, my wife and I were in Cedar City to see a couple of plays at the Shakespeare Festival.  With some free time in the morning, we opted for a trip out to Parowan Gap to see the petroglyphs there.  It was worth the trip, though I wish I had brought a real camera.  Instead I had to rely on the iPhone for the photos here.

Dinosaur National Mounument Rock Art

Figure from the panel at Cub Creek in Dinosaur National Monument
In mid-August, I took a trip to Dinosaur National Monument with my two youngest children.  We visited three of the 5 well-known rock art sites in the park: Swelter Shelter, Cub Creek and Pool Creek.