Tag Archives: rectified photography

Tomb of the Unknowns – part 2

Here are shown four rectified images of the Tomb of the Unknowns (reduced in size/resolution).

Traylor Hall – Mercersburg Academy

The Provident Mutual Insurance Building (2)

The Provident Mutual Insurance Building

This facade was captured and rendered into a single measured line drawing, enhanced by four additional sheets bearing a mosaic of rectified photographs to convery additional detail about the building’s existing conditions.

Cosmos Club Ballroom Rectified Photography

Title Sheet for a set of 14 sheets documenting this beautiful ornate ballroom


Reflected Ceiling Plan

Principal Wall Surface (sample)

Foreshortened surfaces

contact sheet of rectified images

The Cosmos Club Ballroom

Ballroom at the Cosmo Club

Here is a new project that I shot last week: documentation of the existing conditions of the interior surfaces in the ballroom at the Cosmos Club in Washington DC (formerly the Townsend Mansion). This is going to be a great opportunity to show what the photo + measured line drawing approach to documentation can yield (with a limited budget).

an optically rectified image

Just as the last post was NOT a picture of a laser point cloud, this is a rectified image that is NOT derived through photogrammetry… Rather is is a wide angle shot that has been optically corrected to match real world conditions through perspective correction and parallax removal. The point is, though, that this photo can behave like a drawing – offering quantitative data in the same way my photogrammetric work can do. With a little additional field work and a little tweaking in Photoshop (or the Gimp or whatever raster editing software you have) , this could become a reasonably accurate hybrid drawing.  Conceptually, this approach can offer just about any architect or preservationist out there the benefits of photogrammetry without having to get “all the way in the water.”  Of course, not every structure offers itself up to this approach, but I think its interesting that it is the idea of mixing photography and measured drawings that is powerful: it is an approach that grows out of our profession (after all the basis of HABS is the measured drawing and the photograph) rather than a technology that is applied to it.  And it is low cost and widely available!

This cute little warehouse is located in Staunton, VA and has most of its upper floors available in case anyone is looking for a great place to locate a new business!

Streetscape in Guanajuato

far left



far right

Composite Rectified Streetscape

A Streetscape composed of a variety of planes will invariably be distorted when projected onto a general plane. Nonetheless, for the purposes of creating a quick documentation of the architectural presence of these houses lining a street approaching one of Guanajuato’s many tunnels, an imperfect projection does a lot better job than any of the four wide angle shots above (the source photos for this mosaic).

2 boards prepared to illustrate hybrid drawing concept

Board 1

Board 2