Irregular shapes after calculating camera coverage area

[benhemingway]

I used the script given in the post below to calculate the area that each camera is covering, though to save on processing time I changed it to only return the locations of the image corners. It worked, but some camera areas were represented as very long and skinny. I have attached an image of what I mean.

http://www.agisoft.com/forum/index.php?topic=2666.0

Does anyone have an idea about why this has occurred?

-Ben

[Alexey Pasumansky]

Hello Ben,

Is it possible that such shapes actually have only two corners? It may happen if other two corners are outside the reconstructed mesh.

[benhemingway]

Hello Alexey,

I think that is certainty possible and a likely explanation. It is curious though that some appear in the middle part of the mesh and not solely on the periphery. Maybe those portions of the images were not used in creation of the mesh?

I very much appreciate your insights.

Ben

[Alexey Pasumansky]

Hello Ben,

It may happen to very oblique images, for example, or in case there are holes in mesh.

But from the exported data can you extract the information which images are related to the shapes with less than 4 vertices? With this information you can try to check whether the corners of such images refer to the points on mesh or outside.

[benhemingway]

Hello Alexey,

I do have that information with the extracted data. I will check those images to see if that is the case. Thank you again for your suggestions.

Best,
Ben