Messages

1

Feature Requests / Assign user classes

« on: December 22, 2015, 03:29:18 PM »

It would be very useful if photoscan would allow for the renaming of pointcloud classes, or for the definition of new classes. I work with archaeological data, different areas of an excavation are of varied interest. For instance we are not interested in the modern ground surface, the excavated ground surface is of interest where there are features e.g. a grave, wall etc. Therefore when I create a mesh I want the modern ground surface to be low resolution, the base of the trench, medium, and the features high. Also Features need to be treated as arbitrary objects whereas the ground surfaces can be seen as height objects. Currently I am assigning classes like water to the modern land surface, building to features and ground to the excavated area.

Adding this option would allow for a more logical assignment of the point cloud, thank you for this consideration.

Gary Nobles

2

Feature Requests / Re: Request: Dense Cloud Filtering

« on: October 02, 2015, 01:25:42 AM »

Another +1

Struggling with 16GB RAM due to stupidly high point cloud, there are areas I need details and areas where I don't
I now have 200,256,361 points and trying to merge with another even bigger chunk which makes it run out of memory

3

General / Re: xy reference points without a z-value

« on: September 21, 2015, 03:15:50 PM »

Thank you for your responses on this, I've nearly finished aligning the chuncks.

 stihl your idea seems the best, is there any online info on how to do this, I looked in the photoscan manual but information is vague.

mwillis, yes there are a fair few archaeologist working with photogrammetry, some using it better than others. As for using google earth for elevation points, I would be strongly against it, Google Earth, or any similr app, is extremely inaccurate, the georefereced images can have great spatial errors, in some cases things have been 100m+ off.

dcm39, we seem to be in the same boat! The GPS guy took z coordinates of my gcps but discarded the ones for the site grid, so I have a few known height points (10) and 30 known xy points without a z, surely this could be something photoscan could resolve? e.g. what is the elevation a point xy if z is not specified?

sakaic, I'm wanting a full 3D model, I will be creating an orthophoto for 2D GIS but I will also explore the 3D GIS possibilities.

Thank you all, if anyone else has a solution I am eager to hear

Gary



 

4

General / Re: xy reference points without a z-value

« on: September 11, 2015, 12:10:26 AM »

Hi, its a low level survey (camera on tripod) about 1500 photos in total of a Bronze Age cemetery in Greece.
We had a site 10m grid so we have xy coordinates for each grid square corner, but no height information.
I'm now aligning the various chunks. Is there anyway to get Photoscan to null the z coordinate? any NA value?

5

General / xy reference points without a z-value

« on: September 10, 2015, 06:56:57 PM »

Hi, I am trying to align chunks using markers, but my reference markers are a 10m grid without z information.
I try to put in only xy values as a reference point but photoscan wont let me do it without a z value.
I put 0 in as the z value but obviously photoscan flattened my landscape.
Is there a dummy value I can put in for an unknown z value or another way around this?
Thanks
Gary