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Messages - dpitman

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General / Re: Holes in point cloud and distortion around trees
« on: October 09, 2023, 06:35:08 AM »
Try bumping your overlap up a little and try a slightly acute camera angle.  You can also employ a cross grid capture.
These things will help capture more detail in the areas below the edge of the tree canopies.  If it is breezy when you are photographing and the branches are moving. There is no magic setting that will fix that.

It is odd that the open areas between the trees are not rendering well though. Can you share a few of the images from the flight?

General / Re: Holes in point cloud and distortion around trees
« on: October 09, 2023, 03:18:48 AM »
What is the desired goal or data from your work?

What is the overlap setting applied to your image capture distance?

General / Re: Orthomosaic seamlines editing
« on: October 07, 2023, 02:16:24 AM »
Hi Alexey,

Thank you for your response!

I figured out what I was doing wrong.  I was using an ortho that was duplicated, and cropped to an outer boundary polygon.  When I use the original ortho, everything works as expected.  :)  I knew it had to be something simple.

General / Orthomosaic seamlines editing
« on: October 06, 2023, 07:10:01 AM »
I have done this before, but now I'm missing something.

From the manual, page 140
To edit orthomosaic or panorama seamlines
1. Draw a polygon on the orthomosaic/panorama using Draw Polygon instrument to indicate the
area to be retextured.
2. Select Assign Images... command from the context menu of the selected polygon.

It should be basic, but if I draw a polygon on the ortho, the "assign images" command remains grayed out.  I would add that the "show seamlines" command does not do anything either.
What am I missing please?

When the scale does show, it is seemingly arbitrary.  It would be great to have basic control over a scale bar.

I too would like to know if this can be ran in agisoft, and if so how, are there any instructions anywhere ?

The "cloth" method seems like a fantastic tool for determining bare earth points.  However, Agisoft doesn't seem too interested for reasons they have not mentioned.  But it has been asked for.

General / Re: Average Camera Location Error
« on: April 22, 2023, 09:31:01 PM »
So, MS creates tie points (the sparse cloud) and based upon that and the specifications of the particular camera, MS determines a location from where the image was captured without consideration of where the camera says it was taken. And then compares those 2 locations and that is the reported error, correct? 

How does the weighting of the accuracy metric of the cameras play into that calculation?

General / Re: Average Camera Location Error
« on: April 22, 2023, 01:32:17 AM »
Perhaps @ksunglieng is asking about the mechanism for how MS comes up with it's figures rather than identifying the figures?  In other words, WHY does MS say a camera position is more or less "accurate".

General / Re: Characterize Model Accuracy in Real World Units?
« on: April 08, 2023, 03:08:35 AM »
Hey Matt, I don't have an answer, but I question the practicality of trying to specifically dial in spacial error of less than a centimeter.  If something is that critical, point clouds are not there yet.  Use your total station.

Feature Requests / Re: Calculate volume from min height from shape
« on: March 27, 2023, 04:30:57 AM »
Hi Alexey,

I don't want to interfere with this request but I have a related feature request.  For work in material stockpile estimates, we commonly have piles that abut other piles or banks or walls of some sort.  The options in MS don't give us any options to deal with these problems. 

Currently we move the project to Global mapper where we can specify the elevation value at each vertex in order to shape the base plane based upon conditions.  In MS, the program already knows the calculated elevation value at each vertex, but there is no means to adjust or edit those values to modify the base plane.

The ability to do that in MS is my feature request.

Thank you!

General / Re: Techniques to clean your point cloud in Metashape
« on: March 26, 2023, 07:24:09 AM »

Does anyone remove some photos via estimate image quality and pull out any below X value?

This is viable, yes.  But my images have generally all met my threshold, so I have mostly stopped checking them. But I am very conservative with flight speed in order to not have motion blurring, which seems to be the biggest culprit for poor images in uas image sets,  if there is one.

General / Re: Filtering tiepoints after dense cloud?
« on: March 24, 2023, 01:16:58 AM »
Hi Jake,

There is no mechanism to modify the creation parameters of a dense cloud that I am aware of.  If you modify any of the factors that went into its generation, you would need to re-process it I think.

General / Re: How to reduce small of generated DEM geotiff
« on: February 09, 2023, 03:39:10 AM »
You could export a point file instead of a raster DEM.

General / Re: Non-Coded targets automatic detection
« on: January 27, 2023, 02:17:41 AM »
Depending on the nature of the project, I wouldn't waste your time with this tool in it's current condition.  It will detect targets, and miss others. It will give you many more false hits than actual hits.  The colors of the targets are not critical.  They just need to be contrasted in the expected shape. 

For example, on this project there were 3 actual markers.  The tool was set to it's most restrictive tolorance and residual, (1,1), and the tool found 2 of the 3 targets and found 5 non-targets.

Maybe if the tool was shown an example of a target in the dialog box, then it could be more effective. Perhaps, if it was looking for blue pixels as in my targets, it could more easily eliminate outliers.

General / Re: Import Orthomosaic
« on: January 18, 2023, 05:34:05 AM »
Great, thanks for the explanation, Alexey!  I was opening a new workspace and trying to import without saving the workspace first.

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