[Talk-GB] Aerial Photography

Chris Hill osm at raggedred.net
Mon Sep 14 10:44:56 BST 2009


I used to hold a pilot's licence and I did some work photographing 
archaeological sites.  Photos taken pointing sideways are much harder to 
work with than photos pointing straight down. Any kind of rectification 
adds unwanted artifacts.  I used to make high bank angle turns (60' bank 
angle) over the feature I wanted to photograph which made it very easy 
to photograph.

I was trying to photograph a small area in detail, so circling over the 
feature helped.  I was also using film (before widespread hi-res 
digital), so there was a limited stock of film but the resulting image 
was the equivalent of about 25mp.  To reduce parallax I used a telephoto 
lens.

It gives a very interesting overview, but it's not a patch on surveying 
on the ground where you have access.

Cheers, Chris

Tristan Thomas wrote:
> I would be very interested to hear what people think of this effort.  
> I'm currently studying to be a pilot & I know that many people who do 
> fly routinely take aerial pictures of the landscape below, especially 
> of towns etc.  I know most of them would be more than happy to allow 
> their photos to be used of OSM.  If we could find a way to upload them 
> somewhere, then I'm sure we could dramatically increase the aerial 
> photography we have without having to pay to hire the planes or get it 
> sponsored.  I could just upload them all under one Flickr account for 
> OSMers to look through & do some tracing if they wish, but it doesn't 
> seem the most efficient way to do it?
>  
> Thoughts?
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