Bring an orthomosaic in CAD, taking information from the point cloud

so let's assume that you received the output of a 3d reconstruction made by structure from motion photogrammetric software or maybe by laser scanning acquisition and new you own you have an ortho mosaic a TI AF big ortho mosaic file and a point cloud lets us assume that you do not have the tools the artwork and everything that someone that deals that create this kind of data as and maybe you'd like to use this data for a two-dimensional drawing inside a CA d software maybe you'd like to bring the ortho mosaic inside AC ad software and maybe draw lines over that in order to go from a 3d data to a two-dimensional vector data but you got a big big file and you do not know how to do that in one of my previous video that is related to this kind of topic that is moving from 3d to two-dimensional I showed you how to convert a big teeth file of an ortho mosaic with high resolution into a smaller one but unfortunately you've lost all the geo referencing information so you will know you will no longer be able to have the file placed in the right position relation relationship with the coordinate reference system of the original data in this video I'd like to show you how to take a JPEG file of an ortho mosaic that you have resized for your purposes bring it inside a key CA d software and using the information that you can access through the point cloud with the open source software cloud compare you can move you can scale and you can rotate the ortho mosaic in order to place it in the right position and start join over it from the two-dimensional vectorization so let's go inside let's share my screen and I will using this in this video cloud compared that's an open sort of source software for point cloud editing and my CID software which is bricscad and but evil works it will work with any software of any design that you may use so this is the point cloud that you received I know that that's not the best point cloud for working in terms of ortho mosaic because it's basically it's a vertical stuff but that's it that what you have and what you need to deal with in order to to reach your goals then you get this ortho mosaic I've already resized it and if i zoom in and 100% I can I can see some details left and maybe you'd like to draw all the stuff all these walls maybe you'd like to to draw all these steps here and you'd like to use this portal mosaic that comes from structure from motion photogrammetric processing and drawing over it this autumn mosaic file is a JPEG file that is just four megabytes so it's it's small and I think that it can be used basically by everybody and everybody that use any type of two-dimensional drawing software so let's try do this this is my CAD software and let's do that I'm gonna bring take this automatic and drag inside it as you can see the software is asking me for a couple of things and that's not a good thing because is asking me for the position of the Ottomans egg so I click on a point on the two-dimensional space and I define the center of the position on the ortho mosaic and that's good because my ortho mosaic should be geo-referenced well that's not because I've lost all the information moving from a TI f5 to a JPEG file so I need to redo all this process so I need to fix the point I need to assign kind of a scale and that's not the good thing sue because my ortho mosaic should be scaled but again I've lost all this information I got to get them back in this process so I can click and I can rotate I will type now 0 degrees of rotation and then we'll check that I will need some rotation but we'll go step by step in the next minutes so click yes ok and that's it that's the auto modes X and that's inside my bricscad software so if I try and check the coordinates of a center point of this ortho mosaic I'm just basically drawing a line and reading the coordinates of the end point I can check here that the end point is 350 2 meters x coordinate y coordinate that's 250 meters that's that these are very very very different from the from the data that I should have from the information and I should have that from the data that I should relate on and that I can I can check inside the point cloud if I use the point cloud to here that's the point peaking tool I can ask for the coordinate the information on some points of the point cloud that basically for any point of the point cloud so just click here and just click on the point of the point cloud and here I've got the information what are really what is really important for me is this central columns which which are listed the global coordinates which are the coordinates of the original point that I uploaded inside cloud compare when I imported the point cloud the first column is the local coordinates which basically our coordinates that the software have recalculated that it's related to a global shifting global adjustment that the software needs to do in order to better deal with the processing and all the calculation with this points but I need to fix with this information this is the color as you can see this number are very different for the number from the number that I showed you from the the bricscad files and taken from the ortho mosaic inside the 2d software so I need to go back to this data right what can I do I need to check for points that are visible both in the ortho mosaic and in the point cloud so I can scout from four points and when you zoom in I suggest you to increase the point size of the point cloud in order to better see what you are just looking at and you need to find some points that are both visible in one data and in the other one in this case we go for this target that I put on the ground when I did the survey when I did the when I was on the field acquiring data both photographic and topographic data so I got information about this point that I can clearly see in the ortho mosaic so here we go this R at the point that I can see in the ortho mosaic I just need to of this point because we're gonna fix the coordinate of one of them and then we use the other one for scaling and rotating but we'll use a third point in order to check the result and see if everything was fine we're gonna use this point I'm not going to use this one because in the point cloud this point are not visible because the point cloud has been cut so as you can see the point cloud has been cut here and there's information about the the points here where the target was so I'm gonna use this target we're gonna use this target that are visible both visible in your to music and then we're gonna use this target for checking and this is visible in the Artemis egg too I would suggest to use quite far points in order to scale and rotate the ortho mosaic because you will introduce the last amount of error in this in this processing if you use points that are really close one to each other maybe one point here and another point here you can fix the coordinates in this small area but you still may have a lot of differences in the far areas of the point cloud and of the ortho mosaic so let's start with this one I need to check for the coordinates of this point I'm gonna use this point for moving the point the ortho mosaic in the in bricks cap and then using act as a base for the scaling and rotation so how can I ask for coordinates for the true coordinates well for the original coordinates I'm gonna increase a little bit more this data this the point sites okay again I use this tool which is the point picking tool just click here and let's try to pick a point which is in the center of this target here we go here I got the information these are the coordinates of this point that I may want to use it I will use inside the other software bricscad for moving in the ortho mosaic I'm gonna save this label and the software has saved me a two-dimensional label with this information here I can always access to so now I reduce this window moving back I can can remove this I'm moving back to this two dimension of the bricscad and reduce it is it too now what I can do is assigning to this line to the endpoint of this line these coordinates in order to have to define the endpoint of the movement that I need to do with the ortho mosaic so basically what I need to do is type in in this information these coordinates in this properties information about the endpoint of this line so let's start with five seven one seven two nine point nine six there's no point in using I think there's no point in using millimeters because you are introducing some mistakes just in picking this point you are it you cannot be sure that you just pick the center the precise center of this target and so there's no point in using the millimeters centimeters will be good enough the y coordinate is four eight eight one four three two point five four that's it that's me let me enlarge this window as you can see now this line is so long because the endpoint is so far away from the starting point the starting point is where my ortho mosaic is I need to take this autumn mosaic and move I'm gonna take this point as the reference for the movement so I'm gonna try and click in the central part of this target click and then I'm gonna snap to the endpoint of this line now if i zoom in I should see that yes more or less we got it the endpoint of this line which has the coordinate of this target taken from the point cloud now is related to the center of this target we've not done yet because this word mosaic maybe it's still not skilled in the proper way so lets me measure in this software the distance between these two points let's do that unless jack this is 60 me more or less 80 meter sorry let's go back to cloud compare and let's check I'm gonna decrease the points sides and lets me let's check the distance between this point and this point I'm gonna use some I'm still I've still have the point picking tool active I'm gonna use I'm gonna switch to the two-dimensional information that's gonna measure the length between two points I'm gonna click in here and then I'm gonna click in here more or less and the software is telling me that the distance the three-dimensional distance is 29 meters and the two-dimensional XY plane distance is 28 meters more or less 30 meters well we got here 80 meters so this ortho mosaic is so big in relationship relationship with the or with the data with the original data that I should go back to so I need to scale it down how can I scale it down well I'm gonna use the same tools and the same approach that I used a couple minutes ago for moving in the in the right place so let me go back here to the point cloud and let me ask the software cloud compare for the coordinates of this point and I'm gonna increase the point size okay until I can better see the center of this target I'm gonna moving back to the select one point and display its information to here for the point picking just click here and it's not the center I think well it's hard to pick the center but lets us that's us assume that's the center I'm gonna save this label and I'm now I need to read these coordinates which are the coordinates of this point taken from the data the original data of the point cloud and type in in so I can use this line here that's already selected and now I'm gonna type in the coordinates of this point so which are the end point five seven one seven one eight point two forty nine and then go back to the y coordinate four eight eight one four five three point five four that's it let's go back to bricscad and let's enlarge the window worst line here we go so that's the the line that should be the distance between these two so now I need to scale down the ortho mosaic fixing the the base of the scale which will be this point so I'm gonna select your to Mosaic select the scale tool I'm gonna pick this point as the basis the base point I'm gonna use the reference tool in order to select a distance that I'd like to use as a reference tool for scaling I'm gonna select this distance and then I'm gonna move him back until I see where is it here we go until I see the end of this line and just click here here we go as you can see now the ortho mosaic has been scaled but we need to do something more which is a rotation bit we because I would expect you add this end point of this line to be at the center of this target but that's not the case so the ortho mosaic has got some rotation issue to be fixed and we can do it by using the rotation tool so select the point the últimos aook select the rotate tool again I'm using bricks cut but all of these tool are available in any of the CID software that you may use I'm gonna use this point as the base for the rotation so rotation point is gonna be this one because it's fixed I'm gonna use the reference for I'm sorry I I miss it so I'm gonna redo that rotate rotation angle I'm gonna use a reference I'm gonna use click here I'm gonna click here I'm gonna bring this point to these gonna bring the center of this point to the end point of this line that's good here we go now I think that Ultimo's a ik is well placed well scale and well oriented let's use the Third Point that is visible both in the ortho mosaic and in the point cloud to check what we've done so let's use this point that we didn't use it yet in order to check its coordinate in the ortho mosaic inside the two-dimensional software and in the point cloud which gives me back the real coordinate of this point so let's reduce this window and let's go back to cloud compare to let's check the coordinate of this point which is this one so I'm gonna ask and again for point peaking tool which is here try to pick the center I'm gonna save it here's the coordinate I need to check the coordinate here in order to see if everything is fine so I'm gonna let me open up a little bit in order to better see the tools and then I'm gonna move him back again to a smaller size of this window now angle this line I'm gonna check I'm gonna check the coordinates of these end points with the coordinates of this point so coordinates of this point is five seven one seven one seven point six six the coordinate of the end point the x-coordinate is five seven one seven one seven point six seven it's not bad it's about one centimeters of error let's do the same thing with the y-coordinate in the CED in the CAD in the ortho mosaic scale it's four eight eight one four four four point eight four here we got four eight eight one four four four point eight three here we go I think we've done I think we did a good job so now we have an ortho mosaic which is correctly placed in the two-dimensional coordinate reference system which is a projected reference system and it's correctly placed there then it's scaled correctly scaled so if you try and if you gotta measure this distance maybe distance four of these steps here or the the the measure the the length of this table should be the same measure that you may take out in the field or at least that you will take from the point cloud and it's correctly oriented because we adjusted with fixed this rotation issue and now the North actually is in on the upper side of this of this window so now you can you can use this part mosaic as a base for drawing so you can draw lines of this building you can draw these steps you can draw this wall you can draw this table you can even draw you can even reproduce in the two-dimensional vector word all this stone here that build up this pavement and the nice thing about a nice thing about that that is that you will draw things that will have a real sides compared to the original sides of this thing in the real world so that's it I hope that you were able to follow me switching between cloud compare and bricscad and the jpg file of the Ottoman sake I hope that everything was was clear and I hope that this video was useful if you deal with this kind of data again this video is not meant for people or professionals that create this kind of three dimensional data is rather thought is rather I I think that this video is much more useful for people that receive this kind of data in output and they need to deal with that in order to reach the goals or reach their purposes so I hope that is was useful for this reason feel free to share it if you may think that someone else would benefit from this video feel free to reach me out at www.mathantics.com thank you so much for watching this video see you in the next one my name is Paulo Kurata Guinea ciao

Channel: Metrical Talks

Views: 393

Keywords: orthomosaic, 3d to 2d, 3d, 2d, CAD, cloud compare, software, tutorial, scale, rotate, move, image, jpg, how to, metrical talks

Id: JlUReZeQeHo

Length: 23min 25sec (1405 seconds)

Published: Thu May 28 2020