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Topics - stihl

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General / Matched tie points in Sparse Cloud but no data in Dense Cloud
« on: October 29, 2014, 03:41:59 PM »
Hi,

I'm trying to create an Orthomosaïc. The sparse dense cloud after the alignment doesn't show any holes in the pointcloud.
However after running a medium dense point cloud step, holes in the dense cloud appear.

Can anyone explain why this would happen and how I can resolve it?

I was under the impression that Photoscan uses the sparse cloud to densify the point cloud. So how would holes appear in the Dense Pointcloud when the Sparse cloud doesn't show any holes?


Thanks!


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General / -
« on: April 11, 2014, 04:53:07 PM »
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General / GCP error low - high errors on DEM
« on: March 17, 2014, 01:48:04 PM »
Hi,

I've finalized generating a 400 hectare land DEM using 67 GCP, all measured with RTK GPS.
Photoscan says the GCP error is 0.036m however when I evaluate the DEM with RTK GPS checkpoints made in the field, far larger errors are found in excess of over 20cm in the Z value.

Is there any explanation as to why? Even exact locations of GCP in the DEM give out false readings when compared to the absolute values of the GPS measurement even though those points should match 1:1?

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