Agisoft Metashape 1.6 Tutorial - Full Processing from photos to TIN Surface - with GCPs

hello this is Kelly from sky serve I wanted to put another updated workflow video up because there are some new features in better shape 1.6 that I wanted to to go through so even if you saw the previous workflow video I think you'll find value in this one so the very first thing I'm going to do if you guys are new to metal shape is I'm going to configure the screen to change the look of the menu structure we're gonna go up here to tools preferences under themes go ahead and choose classic as is very well that's a very important thing for me you guys might like the old or the sorry the new updated light style or dark style but to me this is just much better more efficient use of space etc so first thing I'm gonna do is add my photos I'll go ahead and add these photos so I think there's about you know 10 or 11 photos here it's kind of a small project so so there we go they're there and next step I'm going to do is go to the reference tab and I know that this is in Wisconsin central so I have other videos talking in more depth about this but basically here's the converts you're going to convert from wgs84 into a projected coordinate system so it's not showing up here this is a new install so there's a couple ways to find this I guess under projected coordinate systems I believe it's Wisconsin central 29:29 I believe is what it is so I happen to know the epsg code so I put that in otherwise you could go ahead and search for it so so here it is and I'm going to go ahead and convert the the cameras into this projected coordinate system I don't need to convert the markers there are no markers here so I'm not deselect those so there you go so now you have this in a projected coordinate system you know like state plane for instance and those those are the numbers so that's the first step I always do that to get that consistent next step I can do is import my points so I'm going to do the import my points right there and then select the the format so here you go I have comma separated values the label for - action the fourth column I believe these are XYZ so I'm gonna go ahead and put in the one two and three and then I'm gonna verify that this is correct so eastings is about two four eight and then the northing is mota two five two two five three or so they look pretty good same coordinate system there I'm gonna go ahead and okay I don't have any of these created so I'm gonna go ahead and create these so I have three points here at the extents of the project my next step is to go ahead and align these photos I want to hear your guys's comments below this is default 40,000 and 4,000 for your key points and tie points respectively well I've changed this on high megapixel imagery if you have a 40 megapixel camera you can change this up you know maybe two three or four hundred thousand and you can change this to zero which means it will not limit the times for this project you know I'm gonna leave it as defaults again I want to hear your comments and ideas I had been using for for a long time one hundred and twenty thousand and then limiting this to zero but like I said for this I'm gonna go ahead and use defaults it's some people have arguments one way or the other you know I'm curious to see what you guys have and and being that I'm using a DJI consumer-grade camera I'm going to use the adaptive camera model fitting and then I'm going to change this for this video to be low I would recommend everybody that's watching this to go ahead and use high but I'm gonna I'm gonna use low just because the you know just to be able to get through this tutorial so those are settings I'm using please comment below on your settings and now you see it so I like to open up this this details option here and that way you can kind of see what the process is is doing so I'm gonna pause the video and I'll come back once this alignment is completed okay the alignment is completed so I can kind of view around here one problem I'm seeing right away so my rotation is really funny I recommend you guys go to navigation mode and change it to terrain mode that makes it you'd only want to pivot along this z axis in one direction otherwise it flips upside-down so you'll notice a couple things mic mic ground control points are actually up above the imagery this is due to an ellipsoid geoid difference if you're familiar with with surveying and with wgs84 drone data you might realize that you're actually getting a height above ellipsoid here instead of but true ortho metric height or an elevation so keep that in mind but it's alright the next step I have is going to be to go ahead and match these points anyway so here's my matching process I'm going to get rid of that ball as well if you go over here I believe it's under model show/hide I'm now I'm gonna nacho a trackball in the middle I'll feel free to you know configure this workspace to work for you another tip I'll give you guys is if you press seven on your keyboard you're gonna see that brings you to a North up perspective from a Nader viewpoint five changes it from from perspective view to an orthographic view so you'll see the perspective view right here that's more of a 3d type view the ortho view is more of a 2d kind of a view from from the top top down so it's kind of a preference there that you can choose so point matching alright so I know that this point Oh point six is up here so I'm gonna right click up in this area I'm gonna filter photos by point okay so that just shows me photos that have this area in them so you're not looking at all the photos this really helps if you're using a big big project so I'm going to open up any one of the photos now if I do a page down this is going to show me where these where these points are so I know that this is kind of on a north west end of a project if I look here basically the far north and I'm gonna go ahead and match this one so again I'm looking for point number six so if I go here I'm gonna place marker six right there and then go to the next picture which is a page down and I'm going to go ahead and place marker six there so I'm going to do each of these in in a couple photos and you should see that these are gonna match so I'm gonna go to point 1 again filter photos by point I can just open up a photo and hit page down and then there you go that's point one right there these are nice images really crisp and pretty low altitude flight I believe this was a hundred-foot select we did okay two photos there and I'm gonna go back to my model view and i'm gonna filter these photos over here double click on any photo and then hit page down and now I'm looking for my marker on this side and I believe that's uh it's right here I'm going to go ahead and place marker [Music] number two right there you place marker to okay so now I'm gonna go back into the model view this is one of the the most drastic points in your entire processing process here I'm gonna update not to my so if you hover over here this is an update that's gonna do is it kind of brings your project down to the control point so I guess in this case up to the control points let me go ahead and optimize I'm gonna use the adaptive model a camera model fitting again it's a DJI quadcopter and those estimate two high points convergence is an option that you can utilize when you view this point cloud you can see it by covariance and if you guys have any insight on this would be great to see that below but but some of these options are new there's a point cloud variance and then once we generate the tense cloud you can see that there's our confidence as well so let's kind of check this out and see you see how we're doing so go up here turn on this one with this little yellow triangle that shows you your Delta's right here and those deltas are in in meters I'm gonna go ahead and and change my units I just realized here that it's showing this in meters so so if you typically work in feet go to preferences here and this changes the u.s. survey foot or international foot Minnesota where I'm based is a is a US foot state so so we're typically using feet so keep that in mind another great tip that I want to share with you guys if you right-click on a on a point on your screen or right-click on the point itself you can filter photos by markers and and what this allows you to do is is use that page down function and that shows you all of the photos where that marker exists and then you can go ahead and match the rest of them it this will save you a ton of time on a big project so again use that page down command and then and then you can go through and match these points pretty quickly I had encourage you guys maybe to do every other on big projects I don't think you need to do every single one but you're certainly welcome to filter photos by markers here I can fine-tune this one a little bit if I want and move these over I'm just gonna match every single one here and then oh I'll share this data set if you guys want just comment below if you want me to publish this data set for you guys time to practice with so one thing you're gonna want to do after you get all these points matches go ahead and update see that does like a best fit kind of a adjustment here and then I'm gonna check these bottom two for the adaptive camera model fitting and the point covariance so you can see we have some really good data right here everything's matching within a hundred and this is a phantom 4 Pro 20 megapixel global shutter camera so these are they're very nice images no doubt ok so we're back to the model the next step that I want to do is create a dense clouds so I'm gonna go to workflow build a dense cloud I'm going to choose low again I would recommend you guys choose high I've used ultra high but I haven't seen significant gains from high and it's just a lot more points you bought double or triple your points and for my workflow I haven't seen an advantage but again I would use high I'm gonna use low on this and I'm gonna go ahead and calculate point confidence this is new for add yourself 1.6 I do recommend you do this and I'll show you why in a little bit but it it's actually a very good new feature and excited to show you guys here shortly yours is going to take longer if you do high this will only take a few seconds Loeb may or may not be sufficient for your project I wouldn't recommend it for production work okay so we have our dense cloud created it's not visible but you can go ahead and turn it on right here so this is uh this is a dense cloud and it worked pretty good but you're gonna have much better result with high this excavator I didn't model very well but on high you'll see that boom models in its entirety so here's what I wanted to show you guys in particular is this this point cloud confidence alright so now you can see that basically in this in this scenario as these points get farther out there's less and less confidence in the in the construction this is a new feature to add yourself and it's been super useful to me in in my survey practice so you you will see that there's an option up here for dense cloud to go ahead and filter by confidence now I've found that this filter you know you can you can filter it up to 255 on the max and the minimum is what you want to change and I found that basically it's between 0 and 15 is where the range is so so this is a low image a low overlap kind of a project so I'm actually going to use something like two okay so now you see that took out some points but not a significant number I'm gonna go back and filter by confidence again I'm gonna jump it up to four right so four so that really trims it down and I'm gonna go one more notch you know my real goal here is to get this sand pile surface so I'm gonna I'm gonna go one more I'm gonna go up to six so if I got a point filter filter by confidence I'm gonna go to six and see what that does and that's that's pretty good I mean I'm kind of getting rid of everything on the outside I might actually go up to seven so if I filter my confidence if I go up to seven that's that's actually really good I'm gonna go with that and it filters everything out that I might not need you're gonna be amazed when you have a project with water this will wipe out any of that noise that you're seeing against against water and it's it's it's really a cool feature so the next thing I'd encourage you guys to do is go ahead turn off your photos turn off your ground control and just kind of look at this and like I said I told you guys my my goal here is this pile in the middle so select what points you wanted to to use as your surface so I'm gonna go ahead in this case and then focus on this larger pile and create ground surface so now you have these this selection right here now and this is the filtered by confidence point cloud' keep that in mind I'm going to go ahead and classify these points so I'm going to assign a class and I'm going to assign a class of ground okay so if they're assigned a class of ground now you can filter by classes and you can see this is the ground class and it is important to to note that that you do this otherwise I don't know if a way to create an actual measure acerous filtering by confidence unless you do this filter then classify as ground and then create the mesh so my next step is going to go ahead and I'm going to build on Nash so I'm gonna go ahead and use the dense cloud our betrayer I'm gonna do a face count I guess of low 20,000 faces should be more than sufficient for this small pile I'm going to go ahead and select a class now you want to uncheck that check ground and then might as well create some some vertex colors go ahead and hit okay if it was if it was me doing this on a project and I had a little bigger site I'd probably go to two or three hundred thousand vertexes you know that's a good number you should be able to make a good model of that but it's not gonna overload a CAD software if if you use three or four million pull point vertexes there's a good chance you're gonna crash your civil3d or whatever auto cad program you're using okay so now we have that created and I like to look at this probably buy like a airframe so now you can see that this is your your model looks very good I think that's probably sufficient for my use so I'm going to go ahead and and export that as a is a DXF with 3d lines and I can import that into my drafting software so a couple ways to export you can actually go here to the workspace and you can right-click on the 3d model and export the model now let's put it right here in the downloads my favorite spot to put piles temporarily I generally use a DXF with 3d faces and I'll just call this sand you are going to want to preserve your coordinates make sure you select your your projected coordinate system there if you do a local coordinates it's going to come out essentially zero zero in the bottom left corner it's probably not ideal if you're using this on a survey workflow if you're gonna 3d print this that probably would work and it might even be beneficial because you're gonna have more reasonable coordinates for a 3d printer I'll go ahead and hit OK that exports that file and now you're ready to import that into civil 3d so hopefully this has been valuable tutorial for for everyone out there and I'd love to hear from you guys on the bottom and if you want to visit my store or support me in any other way I'd appreciate it so thanks a lot for tuning in buh-bye

Channel: SkySurv LLC

Views: 21,104

Rating: 4.9729729 out of 5

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Id: z08VA7-uJiI

Length: 19min 2sec (1142 seconds)

Published: Thu Feb 06 2020