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Topics - matt07lx

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Bug Reports / Sketchfab Upload: "OpenSSL Library Not Found"
« on: July 22, 2019, 07:41:10 PM »
I get the following message when I try to upload to Sketchfab directly from Metashape: "OpenSSL Library Not Found: Please Install OpenSSL 1.0 for Data". I've installed several versions of OpenSSL (64 and 32 bit), restarted Metashape and my computer, and nothing seems to work. Any ideas? I've never had this issue before.

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General / Palaeo3D Scale Bars?
« on: June 06, 2019, 11:58:44 PM »
Just curious if anyone has purchased scale bars from Palaeo3D (http://palaeo3d.de/WP/?page_id=23). They are much more affordable than the ones made by Cultural Heritage Imaging (http://culturalheritageimaging.org/What_We_Offer/Gear/Scale_Bars/index.html), but I'm wondering how durable they are. If anyone out there has a set, would you say they are appropriate for archaeological fieldwork? Will they break easily since they are foam?

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General / Identify Coordinates of Object Center?
« on: January 24, 2019, 06:58:19 PM »
Is there currently a way to identify the coordinates (in a projected coordinate system) of a 3D model's center point? Alternatively, is there a way to create a target or point on the center of the model that will help me get these coordinates? Perhaps a python script can be written to do this? I need the coordinates of the center in order to correctly locate the model when imported to ArcGIS (there are known issues with locating georeferenced models in ArcGIS. I think this may help me develop a workflow to get around these issues).

Thanks!

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General / Model Location shift after import to ArcScene [Solved]
« on: September 16, 2017, 06:29:01 AM »
This is more of a GIS question than Photoscan, I suppose, but I figure someone here might know the answer. I created a series of models in Photoscan of archaeological layers that are all georeferenced using the same markers shot with a total station one time. Therefore I am able to stack them in several programs (CloudCompare and Photoscan, too, by appending the various models into the same project), and they align perfectly since they use the exact same markers with the same exact UTM coordinates. However, when I import the Collada files into ArcScene as multipatch layers, each model ends up slightly shifted (perhaps a few centimeters). Nothing aligns perfectly, even when if I import the UTM coordinates of the markers as a shapefile.

The odd thing is that I've even checked the orthomosaic files from the same models, and they align in ArcMap perfectly, and the UTM markers are precisely located on the targets, etc. What's the difference between orthomosaics in ArcMap and multipatch files in ArcScene that I'm missing? Is it something to do with the UTM coordinates getting rounded down or something in the conversion from Collada to multipatch?

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Python and Java API / "Split in chunks" not working?
« on: June 23, 2017, 12:00:35 AM »
I've tried to use the "split in chunks" script several times (http://wiki.agisoft.com/wiki/Split_in_chunks.py), but it doesn't seem to do anything. It only outputs "7777" in the console the first I try it, then nothing happens each subsequent time. I've tried with a couple different projects too. I'm not certain what I am doing wrong. I've used other scripts (e.g. PS130_coordinate_system_to_bounding_box.py) successfully before.

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General / GCPs with dumpy level?
« on: June 14, 2017, 06:20:33 PM »
I've been trying to design a strategy to create a nice DEM and orthomosaic of a small area (about 40 x 23 meters), but I don't have access to a Total Station or high quality GPS to enter coordinates for GCPs. I'm considering trying to enter local coordinates using a dumpy level. This should give me relative elevation (z coordinates), at least accurate to the nearest cm. I'm not sure, though, how to get reasonably accurate x, y coordinates. I can triangulate distance measurements from known points to plot this on grid paper, but how can I convert this to reasonably accurate x and y coordinates. Is it possible to only enter z coordinates for GCPs and use a meter bar for scale elsewhere in the project? Any thoughts?

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General / DEM without GCPs and UAV?
« on: May 03, 2017, 07:58:41 PM »
I'm trying to work out a method to create a DEM to serve as a base map for an archaeological project in a relatively small area (a property surrounding a historic home). Normally, I use a Total Station to shoot in the coordinates for GCPs, but I likely won't have access to one for this project. These coordinates not only help to georeference the resulting orthomosaics and DEMs, but they provide the x,y plane. To get around this, I was wondering if I could do something relatively simple: get a bubble level with some measurements on it. I would attach a couple targets at known distances for scale, then use the bubble levels to ensure that it was level. The resulting scale bar could also serve as the x,y plane for creating orthomosaics.

The second issue is how to get the proper coverage and image overlap without the use of a drone. I'm guessing that a pole would do the trick, since taking photos from my standing height, even in a relatively small project area, would probably not work.

Would this work? Am I missing anything or making any unintentional mistakes?

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General / Orthophotos of Wall Facades and other vertical surfaces
« on: January 16, 2017, 10:05:13 PM »
I use Photoscan in archaeology to document standing architecture and archaeological trenches. I have a question about the feasibility of using Photoscan to create orthophotos of wall facades or other vertical surfaces. Our GCPs are measured using a total station, and these allow us to create perfect "top down" orthophotos for archaeological plans, but is it possible to do the same for walls and the sides of trenches, allowing for the creation of archaeological section drawings? I know that it is possible to choose a planar projection using markers to define the horizontal and vertical axes for the orthophoto, but if these markers are manually placed onto the 3D model from Photoscan, how accurate is the resulting orthophoto? For instance, will the horizontal orientation of the orthophoto be parallel to the x and y axis from our GCPs, or will it follow the arbitrary horizontal plane between my two markers on the wall? I have the same question for the vertical axis - will it align along the z axis from the GCPs or the line between my markers? What if the wall in question was "slanted" and not perfectly vertical? I'd appreciate any input that anybody could provide.

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