Archive for the 'Marin Civic Center' Category

Mar 25 2009

Terrain Tenacity, fresh ortho pixels

Terrain has been in the mix for me quite a bit these past four weeks.  I’ve worked on pushing ESRI ArcGIS 3D Analyst to its limits of masspoint digestibility, trying hard to bring everything into focus at the same time that everything is sinking down to NAVD88 datum.  An abundant set of waterlines and terrain breaklines have helped to make possible some terrain models that appear to be as good as any one is likely to get from photogrammetric data.  As with LiDAR source, I’m working toward a 30cm gridding interval to sample any reasonable-looking TIN models.

One fascinating aspect of the terrain model is where it ends.  There appears to be a new 1:1200 or 1:4800 shoreline that can be sussed out of some combination of 2.5-foot elevation waterlines, 2-foot elevation contours, and related artifacts.  In fact, it’s a great patchwork of artifacts that must be stringed together.  In the tidal flat areas, there is also plenty of need for validation with multiple photos (hopefully shot at times of lower tides).

Adding to the data bulk there’s a new ortho in town, 30cm natural color flown just about two years ago.  There’s hope of extracting it from the grip of California HARN coordinates after it is all mosaicked.

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Feb 24 2009

Civic Center terrain version 0.9 – dumped in Stanford region

The terrain forge was fired up tonight, and the virtual dump truck made dozens of runs into immersive reality.  Compared with OpenSim where terrain megaprims can be fine-tuned to the precise size requirement, in Second Life I must back-calculate the scale from actual terrain sculpties.  Apparently my trusty Gene Replacement 40-meter spheres can be induced into 35.70-meter terrain blocks, using the method I developed for use in Level 2 OpenSim build of UC Berkeley.  This version 0.9 of the terrain made some mis-calculations about the ultimate size of the top sections of each sculpted prim.  Look for better scale control with version 0.91 soon!

view Sly in RL, vu Ely in SL, northerly Stanford region

view Sly in RL, vu Ely in SL, northerly Stanford region

closer look at drive-under location ("first arch")

closer look at drive-under location ("first arch")

view Wly in RL, view Sly in SL Stanford region

view Wly in RL, view Sly in SL Stanford region

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Feb 16 2009

Terrain on tap – OpenSim on deck

There’s some progress on a couple of project fronts.  I’ve started assembling some USGS terrain for a 1:10 scale Level 1 build that could involve more OpenSim regions than I’ve ever stood up on one machine before.  Snapshot of progress is here, with a goal of 304 OpenSim regions for the model.  I expect that the OpenSim server will be re-imaged and a new build attempted in the next couple of weeks.

Vicinity of Colorado Springs, CO - with a full mile of terrain elevation subtracted

Vicinity of Colorado Springs, CO - with a full mile of terrain elevation subtracted

The site design for the Marin Civic Center build in Second Life Stanford region is also moving along with its target 1/8 region (two SL acres) based on RL terrain and building at 1:1 scale Level 3 build.  Progress sketch below:

Context model data of terrain for Civic Center Administration Building

Context model data of terrain for Civic Center Administration Building

A bit more can be reviewed by looking at the PDF of the same map here.cc_topo_20090211

Finally, a sky tag has been added to the space above the build. It is visible as a streak to anyone who visits SLURL.com by a mouse roll.  The Stanford region now has a large “MARIN” visible in its upper reach, squarely in the middle of the ancient Second Life Outlands.

Stanford vicinity from SLURL.com on 15 Feb 2009

Stanford vicinity from SLURL.com on 15 Feb 2009

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Feb 03 2009

SIMGIS Move: OpenSim for workbench, SL for presentation

Published by under Marin Civic Center,Scale Issues

Down in the “basement” a server awaits a bit of configuration to become an OpenSim lab to support the Marin Civic Center development.  How nice it would be to load terrain into a portion of a Second Life region, but alas–it seems unavailable to those of us without Estate controls.  The 1:1.00 scale terrain will need to be calculated to back the base ortho-image that has already been tiled over the site as shown in the last blog posting.  I have verified that one of the 40-meter sphere oversize prims in my inventory can be rebuilt into a massive terrain sculptie.  Placing a 32×32 sampling (30×30 at most that are usable for terrain) of 1-meter terrain samples will give me a guide, and then I’ll just need to diddle with the SL client bulldozer tool to approximate the terrain prim, before disposing of it.

Thanks to the frequent updates of the region map at SLURL.com, I can already see some of the build taking shape.  On the second image below I sketched my virtual moving van’s path from Gualala to Stanford.  To aid overview map navigation and VFR-flying avatars, I have constructed a large readable sky label in crude imitation of the long-standing skywriting by SL resident Web Page in region Da_Boom.

Da Boom -- probably named after De Boom

Da Boom — probably named after De Boom

From that origin, the old Gualala locale was at region grid (1008,998), and the new Stanford site is at region grid (1006,1000).

The heart of the old SL Mainland

The heart of the old SL Mainland

Oddly enough, Stanford appears to be the fourth-oldest region, according to this relatively ancient map.

Second Life regions 2002 11 21

Second Life regions 2002 11 21

On the ground, I’m still in process on some lot line adjustment I’d like to make before breaking ground. The terrain sculptie method has been proven, although I have yet to grid actual terrain values for the project site. Also, I’m trying to minimize RL dimension measurements if possible, by using best available historical information on the RL site.

Some things have changed in SL viewers in the last few months. About a year ago, it was possible to take an oversize prim and modify a single dimension, having that snap to 10 meters. Currently, any change in a dimension of an oversize prim results in all three dimensions snapping to values less than or equal to 10 meters. It’s a new challenge, but can be managed. Still, once a builder has tasted the freedom of OpenSim, it is awfully hard not to chafe at those sorts of restrictions.

I’m giving thought to a copy of Second Inventory to facilitate the use of OpenSim for dev and SL for production, but the issue of prim size shrinking will be a big issue for me.

Curiously, I have found that physical prims to not drop to the ground in Stanford.  This has never been the case in Gualala, so I’m intrigued and opened a ticket with Linden Lab.  I’ll see what they say. Meanwhile, I’ll keep my eye on the sky for the project’s mark (in the old ceneter of OUTLANDS)

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Jan 31 2009

Marin Civic Center 1:1 scale texture in Stanford – feels bigger than OpenSim

Only the four-story Administration building (wing), not the two-story Hall of Justice. I’m tired so I’ll let the shot speak for me.

photo from 2009 01 30

photo from 2009 01 30

To me, it’s mildly amazing to realize that F.Ll.Wright’s design fits so snugly in 1/8 of a Second Life region at 1:1.00 scale.  The Civic Center Administration building is a Real-Life building that can be visited, providing an easy way to get a true RL immersive sense of its scale.  Building at 1:1 scale in Second Life for the first time, this has been my first experience of transferring that awareness into the multi-region contigous space of the very beautiful Second Life.  Sure, I’ve built large areas at 1:1 using draped LiDAR data, but to have a rather large single building (or at least its footprint for now) in context with existing builds that I’ve seen for months, well, at the moment SL seems larger than I’d thought.  That shift in my perception of SL scale may be the contrast between flying (quite fast as it turns out) around 40 to 100 OpenSim regions versus walking around the site and knowing how long it takes to traverse the RL building.

Anyway, check out the build’s progress at secondlife://Stanford/100/235/30

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