[OSGeo Africa] Georeferencing or overlaying old aerial photograph with cadastre

[Walter Smit]

Hi Gavin

I have tried SfM (Agisoft Photoscan) with old imagery (1950s). I did discuss this very briefly with Aslam as well. The results were quite unsatisfactory because of the quality of the source materials. Unfortunately the old imagery has lots of specs/dust/scratches/degraded film which confuses the software. And in the end it not orthorectified either.

I have not done a thorough test though. And yes, the PhD student from UCT has done much more interesting and thorough tests than me ☺

Hope that is not too OT.

W

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Gavin Fleming
Sent: 17 November 2016 09:47 AM
To: Africa local chapter discussions
Subject: Re: [OSGeo Africa] Georeferencing or overlaying old aerial photograph with cadastre

On 17/11/2016 08:47, Aslam Parker wrote:

We are looking into software that is specifically suited for orthorectification of historical imagery using DEM and patch rectification.
Have you considered SfM (structure from motion) for the historical imagery?

FOSS: https://opendronemap.github.io/
Proprietary: Pix4D, AgiSoft



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