While some companies still rely on manual assessment of dimensions, others are way ahead and are using photogrammetry. It’s the science of making measurements with the use of photographs. After this, it only gets complex. Triangulation is main principle in this approach. By taking at least two photographs from two places, you’ll see an object or a location in two perspectives.
“At Least Two Photographs”
Two photographs are enough if you’re trying to triangulate a single point. Companies involved in glass and balusters only need small amount of photographs. A real estate developer that handles vast spaces of lands requires multiple-point triangulation.
Those images are then joined analytically to generate a three-dimensional coordinates of the points of interest. Now, as for the “photo” part of the method, it’s more complicated than you might think. Getting a powerful camera is only the start, and you’ll need a photographer-level of proficiency.
Photography in Photogrammetry
To create the most accurate measurements, the images must be of the highest quality. Like what Design n Consult explained, “Not all companies have the technology to measure the most difficult surfaces and corners around your house. The danger of choosing a company without the necessary capabilities puts your entire project in jeopardy.”
In turn, this will require the most powerful devices. The redeeming part is that photogrammetry mostly utilises field of view, focus and exposure.
Field of View – Normal lenses have about 50-degree fields of view, enough for small projects but insufficient for large ones. Bigger lenses, however, don’t always provide the solution. Sometimes, just moving further away will provide the right angle needed.
Focus – Images used in photogrammetry must be sharp. Whatever it is you’re trying to capture, make sure it’s as sharp as possible. You need to be able to point out your points of interest in the picture.
Exposure – In the basics of photography, exposure can be valuable in enhancing the aura of the subject. In this aspect, the important thing is to blur the background to focus on the target. There’s no need for effects; just take the sharpest photograph you can at the right exposure.
Photogrammetry is a complicated endeavour, but it produces one of the most exact measurements. If you’re interested in using cameras to scale something, it’s best to read photogrammetry manuals before buying your equipment.