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Super Contributor
Posts: 470
Registered: ‎10-27-2015

Orthorectification with control points

I would like to Orthorectify images (with RPCs), in the spatial modeler, using CGP. 

 

Is it possible?

Is there any model example that I can use to start some tests?

thank you very much

Regards

 

Giuseppe M.

Super Contributor
Posts: 470
Registered: ‎10-27-2015

Re: Orthorectification with control points

So, Is not possible to orthorectify images (with RPCs), in the spatial modeler, using CGP?

Technical Evangelist
Posts: 667
Registered: ‎10-01-2015

Re: Orthorectification with control points

Yes it is. You first need to triangulate the data using something like this:

 

DataTriangulationDiagram.JPG

 

..and then you'd use the adjusted model parameters in something like this to orthorectify:

 

image2015-6-11 11:29:57.png

 

 

Which, of course, could be combined into a single model if you wanted.

 

This is the Read Model sub-model:

 

image2015-4-13 16:56:10.png

 

Cheers

 

Ian

Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial
Regular Contributor
Posts: 205
Registered: ‎11-16-2015

Re: Orthorectification with control points

Can you re-up the images; not showing for me. Ta, J.

Super Contributor
Posts: 470
Registered: ‎10-27-2015

Re: Orthorectification with control points

Thank you for the reply Ian!

I can't see images :-(

Thank you

Regards

Highlighted
Staff
Posts: 566
Registered: ‎02-02-2016

Re: Orthorectification with control points

This is a repost of Ian’s comments including the images.

 

You first need to triangulate the data using something like this:

data_triangulation_model.png

..and then you'd use the adjusted model parameters in something like this to orthorectify:

 

image2015-6-11 11-29-57.png

 

Which, of course, could be combined into a single model if you wanted.

 

This is the Read Model sub-model:

image2015-4-13 16-56-10.png

Super Contributor
Posts: 470
Registered: ‎10-27-2015

Re: Orthorectification with control points

Thank you very much for the information.

How can I connect the Perform Triangulation Operator with the Read Model? Using the TransformFilenameOut?
thnk you

 

model_01.PNG

Technical Evangelist
Posts: 667
Registered: ‎10-01-2015

Re: Orthorectification with control points

[ Edited ]

Hi Giuseppe ,

 

I'm not in front of a system right now, but if I remember correctly  you will need to use a File Input operator to feed the appropriate Transform filename into the Read Model sub-model. The Transform file will have been produced by the Data Triangulation operator. Based on the template you provided as input to Data Triangulation you will be able to automatically determine the correct name to pick up in the File Input.

 

In these types of instance it's important to force an order of execution on the model . The Transform files have to have been created before the File Input can trigger and read them. So you'll probably need to select the Data Triangulation and File Input operators and turn on Flow Control (Spatial Modeler tab / Show group / Show Flow Control). Connect the Next port of the Data Triangulation operator to the Previous port of File Input. That should force the order of execution.

 

Hope this helps (and is correct - I'll check when I get a chance).

 

Cheers

 

Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial
Super Contributor
Posts: 470
Registered: ‎10-27-2015

Re: Orthorectification with control points

Hello Ian,

Thank you very much for your support. I have almost completed my model. Can you please tell me if the accuracy that come out from the Read sub model is the RasterCE90Accuracy or the RasterRMSEAccuracy?

Thank you very much

Regards
Giuseppe

Technical Evangelist
Posts: 667
Registered: ‎10-01-2015

Re: Orthorectification with control points

Hi Giuseppe

 

Looks like they are the results of the TransformFilename port of the Data Triangulation operator, so the error is the root mean square error measured in the error units.

 

Cheers

 

 

Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial
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