Using photographic images to create scales for measuring their dimensions

[NW Mailing List]

Taking one more look thanks to Jimmie and Neill, there is something I can
use for dimensions: the whistle post.  I will assume that the sign and
the closest utility pole are equal distance from the camera so no scaling
is required.

The sign face is 16 inches tall, and the rail posts are supposed to be 8'
3" above ground. It also states the signpost should be between 9-13 ft from
the closest rail so that will help with placement.

Mike Rector
[image: image.png]
[image: image.png]

On Wed, Aug 9, 2023 at 11:23 AM Mike <mrector333 at gmail.com> wrote:

> "Glass insulators like those shown in the photo taken at Boaz siding were
> pretty much all the same height.  An enlargement of the photo would allow
> measurement of those insulators.  That height can become the basis for a
> scale that could allow measurement...."
>
> Thank you Neill - Great minds think alike. 😃 (see attached pic which I
> have used to lay out the module basics)  I agree wholeheartedly with
> your premise. My concern is that I would be in using such a small object
> (glass insulator); there is a lot of room for error when you extrapolate
> that small data point into a larger data point such as pole width/height or
> crossarms length.
> Mike Rector
>
> [image: image.png]
>
>
>
> On Wed, Aug 9, 2023 at 8:05 AM NW Mailing List <nw-mailing-list at nwhs.org>
> wrote:
>
>> My father taught mechanical and architectural drafting in high school and
>> assured me I would always be able to find employment using those skills.
>> Fortunately, he also taught me how to hang doors, for the same reason, and
>> his prophecy held in that case.
>>
>> The craft of drafting vanished fairly quickly in the wake of computer
>> aided
>> design.  However, I remember from my own work at drawing boards
>> encountering
>> the problem of dimensioning images like photos.
>>
>> Glass insulators like those shown in the photo taken at Boaz siding were
>> pretty much all the same height.  An enlargement of the photo would allow
>> measurement of those insulators.  That height can become the basis for a
>> scale that could allow measurement of all the additional visible
>> attachments
>> to the pole, from which I suspect even its height, the main dimension that
>> is concealed behind the tree line, could be derived.
>>
>> Neill Herring, retired draftsman, Atlanta. GA
>>
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