Hi Tim,
Your photos got stripped out--at least in my inbox.
Dave
On Sun, Dec 6, 2020 at 11:21 AM Timothy Scarlett <[log in to unmask]> wrote:
> Hi all,
>
> I’m looking for comparative information about structures like these:
> file:///Users/scarlett/Desktop/129293577_10221429802767016_5288243268648673110_n.jpg
> <file:///Users/scarlett/Desktop/129293577_10221429802767016_5288243268648673110_n.jpg>
>
> This image shows a steel frame that I think held an "above the ground"
> target for aerial photography and survey. I can’t find any other examples
> of this type of artifact using google image searches— plenty of examples of
> control point targets for aerial survey, but no discussion of historic
> methods. A couple of these are scattered around in the woods here.
>
> Anybody know any examples?
>
> Thanks
> Tim Scarlett
> Michigan Tech
>
> Photo shared publicly by Kirstin Knaup Hensley. I will follow up with her
> if anyone sends more information.
>
>
>
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