The Reality Capture of Ellis Island

From field to office archive

The challenges of digitally capturing the three sizeable, interconnected hospital buildings of Ellis Island from the exterior included the structures’ irregular footprints; large aged trees in close proximity; inadequate exterior sight lines to rooftops due to a nearby sea wall; and ongoing construction to repair damaged infrastructure from Hurricane Sandy.

内部空间还面临着挑战，包括医院的四层和复杂的阁楼，总共有11,148米的复杂，断开的Mazelike走廊和空间。除了挑战外，还需要解决数十年的劣化，包括倒塌的墙壁，无法通行的楼梯，尽管窗户登上了窗户，但没有工作照明，这导致了整个扫描过程中使用了广泛的室内照明装备。

在过去的几年中，11,148米的内部地板空间和复杂的外部足迹是一个艰巨的范围。The ScanStations’ extended target acquisition ranges were pushed to the limits to keep a tight, accurate control network around the large structures while interior efforts focused on major corridors, large spaces and stairwells to build out the key interior spaces and link the floors in the digital point cloud model.

“In the hundreds of surveys I have performed for the NPS, I would deem this the most challenging due to this disjointed nature of interiors and the few access points and sight lines to the exterior,” said Davidson.

With the newest ScanStation P40 in the HDP’s arsenal, blazing fast scanning speeds are providing an opportunity to capture a far greater amount of the 250 interior rooms.狮子旋风, the 3D modelling software, continues to be the backbone of data processing for photo-texturing and the registration of years’ worth of HDS data, controlled in a survey network.

From Cyclone, in addition to the virtual tours and other interpretive media, the data is migrated to AutoCAD viaLeica CloudWorx软件in order to create one of the pillars of the HDP - 2D measured architectural drawings of great accuracy and detail. Such drawings were historically created entirely by hand-measurements. Although hand methods are still used by the HDP to create complete parametric 2D drawings by filling in data gaps (“shadows”) in the scans (for example, where the details of window frames were blocked by boarding), the laser scans create the baseline of accuracy key to archival records that will guide future rehabilitation or mitigation against possible damage.

戴维森总结说：“几乎不可能准确地绘制内部空间，更不用说采用传统调查方法的复杂屋顶线了。在创建最终的档案图纸和记录时，HDP知道建筑组件之间的确切关系消除了猜测，并在现场和办公室中节省了宝贵的时间，使我们能够将精力集中在重大和独特的细节上医院建筑。对我来说，激光扫描岩石！”

Back to Reporter 75 article overview

Story: The reality capture of Ellis Island
Chapter 1:Hurricane takes a hit on history
第2章：Reality capture for rehabilitation and interpretation
第3章：从字段到办公室再到档案