2009.07.02 Eighteen Bridge Tour

continued...

Low Level Bridge

Model and Building information

I've often wished that Edmonton didn't paint so many of its bridges in funny colours. The Walterdale is green, the Dawson is blue, the ones straddling Groat are red, and on the Capilano they are green again. What's wrong with good, old, Victorian black?

Then there is the Low Level, which does have a bit of a greenish hue but which is basically just gray. And I don't like it. I guess that neutral colours work on fancy bridges like the High Level, but that the smaller bridges really do need something extra.

For the model Google's terrain was once again way off. The level of the water under the bridge slopes by 25', which means that the piers had to be different heights which makes no sense at all. The elevation of the south approach is also too low, so there is quite a major speedbump at that end.

The High Level Bridge

Model and Building information

A bridge model is a bit different from a typical building. Rather than modeling all the individual structural pieces, it uses a lot of partially transparent textures. Transparent textures can also be useful on building models (the sunshades on the Baker Clinic, or the fire escape on the Arlington), but not on this scale. Since transparent textures in Google Earth have to be png format (rather than the typical jpg) and since png's don't compress very much, this model is the largest model I've ever done at about 2Mb.

Still, I'm quite pleased with how it turned out. There's enough detail in the textures that you can zoom right in on the bridge, and it's a pretty good representation of what the High Level looks like.

The main annoyance was that the Google Earth terrain doesn't match the actual bridge approaches. This is particularly true at the north end, where the terrain had to be built up by 90' to avoid leaving the end of the bridge hanging in mid-air.

2008.10.12 Wainwright Trestle Bridge

Not actually Edmonton, but a quick side trip to a trestle bridge near Wainwright.