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Occasional Contributor
Posts: 5
Registered: ‎08-15-2018
Accepted Solution

Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

I have stereo pairs of Worldview 3 satellite imagery. I was wondering if I would be able to use the Tridicon SGM option to generate a DTM from a single image pair as my image pairs have no to very little overlap. All the examples that I have seen online have used multiple image pairs for DTM extraction, is this necessary?

Occasional Contributor
Posts: 5
Registered: ‎08-15-2018

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

To add to this, I have tried to follow the steps as shown in the 'tutorial' video by Hexagon, however, I ended up with copies of my images in the output directory and no point cloud was generated. (this process also only took a minute or so, so I'm pretty sure that no points were even calculated.) 

Regular Contributor
Posts: 219
Registered: ‎11-16-2015

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

HI. A single stereo pair works fine using Tridicon. However, a stereo pair with no overlap isn't a stereo pair I'm afraid! You need two images with different look angles that cover the same area for a stereo pair. Cheers, Johnnie

Occasional Contributor
Posts: 5
Registered: ‎08-15-2018

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

Sorry if I didn't explain it clearly, I have 3 stereo pairs with good overlap of >80% (between 2 images). However, there is no overlap between the pairs

Regular Contributor
Posts: 219
Registered: ‎11-16-2015

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

Ah, in which case that should be fine. Does your block file look OK?

Occasional Contributor
Posts: 5
Registered: ‎08-15-2018

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

I think so, it works fine with the eATE DTM extraction

Regular Contributor
Posts: 219
Registered: ‎11-16-2015

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

Do you have a license for SGM? Educational licenses do not include it as standard.

Occasional Contributor
Posts: 5
Registered: ‎08-15-2018

Re: Will a single stereo satellite image pair work with the Tridicon SGM DTM extraction option?

It turns out that we didn't have the license that we thought we did. Nonetheless, Thank you for your help

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