Photogrammetry


At the moment, there's simply a copy of a Usenet message describing the difference between a rectified aerial photo and an orthophoto. More to come.

Rectified Photo, Orthophoto

Below is an extract from a Usenet message describing the difference between a rectified photo and an orthophoto.

From: "cyclone" <tony@bigpond.blablah>
Newsgroups: sci.geo.satellite-nav
Subject: Re: GDA94 / Etrex / Oziexplorer
Message-ID: <gURfa.178$6_4.11839@news.optus.net.au>
Date: Tue, 25 Mar 2003 05:35:08 GMT

I work for a govt department that has mapping responsibilities and I got my
photo from one of our  cartos.  I asked for a definition of rectified (since
I'm no expert :) and got this reply :-

"The term "rectified" in photogrammetry originally referred to a photo that
had the effects of tilt and tip rotations of the camera removed. This was
simply a projective transformation of the original aerial photo and retained
all distortions due to relief displacement.
An orthophoto is an aerial photo that has had all distortions removed (ie
camera rotations and relief displacement). It is therefore a correctly
scaled photo map.

Nowadays the term "rectified" is also loosely applied to an orthophoto. "

What they had given me was actually an orthophoto.

Hope this answers your question.

Tony


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