it was just one example

Especially when the study states that the results vary

And again

Hills and valleys exist

@Hero Hello?

I have done photography studies of the horizon at sea level (near salinas ,Ecuador) and Switzerland (Jungfraujoch)

Did he ran away?

photo sweeps covering circa 60 degrees

Photography studies

images projected onto 30 foot screen

60lb monofilament stretched end to end

zero deflection from horizontal in the middle

had two other PhD colleagues with me

define horizontal deflection

added 2 more to the community that day 😉

looking for deviation from perfectly level

i.e. no hump observed

no curvature

been looking for curvature for 5yrs

And you did this study based on one picture

no

multiple photos

@pablochanches What evidence do you have?

and panaroma mode

And have u tried zooming in more

What is ur PhD in by the way?

Chemistry

How much math did you did while studying?

So how does that in anyway give you any knowledge of geology/geography

it doesn't. I never said it did.

Have you once used a simple weather balloon to see the curvature

I haven't. but others have

Also in this study of urs what was the independent variable

120k feet.

still dead flat

@Flat Earth PhD If i give you a question about chemistry can you answer it?

probably not. there are probably high school students that could ask me a question I don't know.

it was over 25yrs ago