One Week Left
Hej!
Week two is over. We're doing well enough that week three should be mostly finishing up loose ends, and cleanup. The amount of work we've finished over the past two weeks has astonished me, and I'll try to summarize it briefly.
We've almost finished total station work, which gives us a "point cloud" in three dimensions. This information is in the museum's coordinate system, which allows our work to be tied back to the drawings of other parts of the ship. When you look at the cloud, the curves of the different surfaces are readily apparent.
Using the total station as the skeleton for our drawings gives us several freedoms you don't normally enjoy. First, it frees us from having to do measured detail drawings, because once you reference a point in your drawing, that work is precisely located in space. Another benefit is that we can establish a baseline between any two total station points, which means we don't have to run our own datum lines.
In addition to the several hundred total station points (and the associated 16 pages of catalog), we have sketches of nearly every part of our work area. This fills in all the details of construction that aren't captured electronically. More points for the 3D model will be generated from these sketches.
We've also been taking lots of pictures (which I'll try to get posted here pretty soon). A question was raised regarding our photography process, since the conserved wood is very dark and hence hard to photograph. We've found a couple methods to get around this. Exterior pictures are difficult, since the museum itself is very dark, and the ship is very big. The best method is to turn off the flash, and use a long exposure. This also has the benefit of negating the "Christmas tree" effect that comes from all the total station reflectors we've been using. Since the sticky points are designed to reflect light, your flash pictures end up looking like a constellation of red stars! Inside the ship, things are a little easier, since we can get close to wood and since we can turn on fluorescent lighting. Hopefully that answers the question and provides a little bit of help if you're ever trying to take Vasa pictures.
In other news, Stockholm has chilled considerably since we arrived - it's 28 degrees at the moment. Combined with the short days (sunset was at 2:47 this afternoon), it's a little hard to see the city.
I'll try to get Week One and Two pictures up sometime soon, but in the meantime, enjoy this picture of Vasa's bow, courtesy Wikipedia.
Week two is over. We're doing well enough that week three should be mostly finishing up loose ends, and cleanup. The amount of work we've finished over the past two weeks has astonished me, and I'll try to summarize it briefly.
We've almost finished total station work, which gives us a "point cloud" in three dimensions. This information is in the museum's coordinate system, which allows our work to be tied back to the drawings of other parts of the ship. When you look at the cloud, the curves of the different surfaces are readily apparent.
Using the total station as the skeleton for our drawings gives us several freedoms you don't normally enjoy. First, it frees us from having to do measured detail drawings, because once you reference a point in your drawing, that work is precisely located in space. Another benefit is that we can establish a baseline between any two total station points, which means we don't have to run our own datum lines.
In addition to the several hundred total station points (and the associated 16 pages of catalog), we have sketches of nearly every part of our work area. This fills in all the details of construction that aren't captured electronically. More points for the 3D model will be generated from these sketches.
We've also been taking lots of pictures (which I'll try to get posted here pretty soon). A question was raised regarding our photography process, since the conserved wood is very dark and hence hard to photograph. We've found a couple methods to get around this. Exterior pictures are difficult, since the museum itself is very dark, and the ship is very big. The best method is to turn off the flash, and use a long exposure. This also has the benefit of negating the "Christmas tree" effect that comes from all the total station reflectors we've been using. Since the sticky points are designed to reflect light, your flash pictures end up looking like a constellation of red stars! Inside the ship, things are a little easier, since we can get close to wood and since we can turn on fluorescent lighting. Hopefully that answers the question and provides a little bit of help if you're ever trying to take Vasa pictures.
In other news, Stockholm has chilled considerably since we arrived - it's 28 degrees at the moment. Combined with the short days (sunset was at 2:47 this afternoon), it's a little hard to see the city.
I'll try to get Week One and Two pictures up sometime soon, but in the meantime, enjoy this picture of Vasa's bow, courtesy Wikipedia.
posted by Eric at
11:26 AM
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