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Messages - radar_boy

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16
General / Copying markers between chunks
« on: April 29, 2017, 07:25:43 PM »
My project needs to be processed as several chunks. In the first chunk I have spent a lot of time carefully placing and naming a LOT of markers (non-georeferences, i.e. no XYZ coordinate, I just want to use them to align my chunks). How can I copy markers from one chunk and use them in another (granted, I'll have to place them all again in the photos, which is the whole point, but I won't have to carefully name each one over and over for each of my multiple chunks)...???

17
General / Re: Patches of high/low areas in point cloud of terrain
« on: December 20, 2016, 08:56:46 PM »
BTW, before any culling of tie points none of them have a Reprojection Error exceeding 0.7

18
General / Re: Patches of high/low areas in point cloud of terrain
« on: December 20, 2016, 08:54:42 PM »
With those settings I get 6000+ tie points remaining, from an initial 11000+. When viewing the points on the photos they are also well distributed.

I've tried creating a dense point cloud without culling any points (i.e. the full 11000+) and I get the same patch features.

19
General / Re: Patches of high/low areas in point cloud of terrain
« on: December 20, 2016, 06:53:03 PM »
Here is the report:

Code: [Select]
# Cameras (4)
# PhotoID, X, Y, Z, Omega, Phi, Kappa, r11, r12, r13, r21, r22, r23, r31, r32, r33
os_82033_v_007.tif   385919.2062696178900000   80746.1490088077700000   2427.9801713772022000   0.7060472463219131   0.2065422957097703   107.2342390549936500   -0.2962769314526411   0.9550158037652961   0.0128372289662858   -0.9550952753791041   -0.2962987877252764   -0.0002081851235714   0.0036048352973428   -0.0123224571842452   0.9999175777089938
os_82033_v_008.tif   386584.1999433031300000   80927.3854616020980000   2425.6020255756343000   -0.5128383450749853   -0.4169149396235561   105.5489794258962300   -0.2680549433469141   0.9633456018838577   -0.0105734894103801   -0.9633761468246594   -0.2681140473115296   -0.0046105708435342   -0.0072764741843152   0.0089503611804028   0.9999334697659568
os_82047_v_412.tif   386081.3126213328800000   81161.9456559692480000   2431.9811098230434000   -0.2335982434049884   -0.6860605727900033   91.5673559836439070   -0.0273501499821671   0.9996162176851944   -0.0044030258572207   -0.9995542001773864   -0.0274006826591848   -0.0118576345683536   -0.0119737297321647   0.0040767549051963   0.9999200017330107
os_82047_v_413.tif   386693.7980145422600000   81184.8961358359810000   2436.3725434047310000   -0.0936927697184504   -0.1114061128241012   92.0538592661327900   -0.0358388622876644   0.9993561290843859   -0.0017038812747297   -0.9993556900572562   -0.0358420596531271   -0.0018845450398761   -0.0019444022504265   0.0016352434969241   0.9999967726340895

20
General / Re: Patches of high/low areas in point cloud of terrain
« on: December 20, 2016, 06:46:15 PM »
I used Medium for initial alignment.

I then used Gradual Selection and culled the points according to the following threshold:

Projection Error: 0.2
Reconstruction Uncertainty: 20
Projection Uncertainty: 20

I then Optimised Cameras with defaults using the remaining points.

21
General / Patches of high/low areas in point cloud of terrain
« on: December 20, 2016, 06:31:22 PM »
I'm using some vertical aerial photographs to create a Digital Elevation Model (DEM) and orthophoto of the terrain. I have ground control points (GCP) measured using Differential GNSS. The images align very well and the production of the dense point cloud (setting High) goes according to plan. However, in the point cloud there are gaps, where patches of ground are noticeably higher or lower than that surrounding it. It is hard to see without panning around, but when creating a mesh from these points the patches and their edges become really evident. This is nothing like the actual landscape. How are these caused and how can they be corrected?

Many thanks


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