Messages

16

General / Alignment Stuck at 99% for 2 days

« on: August 24, 2019, 10:42:34 PM »

Hi everyone,

I'm trying to align over 30K images in agisoft. I'm getting this in teh details pane.

adjusting: - 0.237568 -> 0.237568
merging failed
block: 1719 sensors, 11236 cameras, 18374058 points, 49051839 projections
block_sensors: 1.41641 MB (1.97589 MB allocated)
block_cameras: 4.37192 MB (4.91354 MB allocated)
block_points: 841.098 MB (1231.7 MB allocated)
block_tracks: 70.0915 MB (70.0915 MB allocated)
block_obs: 935.59 MB (935.59 MB allocated)
block_ofs: 140.183 MB (140.183 MB allocated)
block_fre: 0 MB (0 MB allocated)
adding 14924089 points, 0 far (13.256 threshold), 15132 inaccurate, 8126 invisible, 999 weak
adjusting: xxxxxxxxxxxxxxx

It keeps trying to adjust and it's been at 99% for over 2 days. I don't want to cancel the processing just in case it's close to finishing, but if it's going to take for ever I will have to abort. Please can anyone help me out here?

Best,

Santiago

17

General / Breaklines and mass points

« on: January 24, 2019, 09:40:29 PM »

Hi everyone,

What would you say is the most precise and efficient way  of creating breaklines and mass points from UAV data sets. I normally don't do this for every project, only those were roads, creeks, rivers, mine pits and so are present, this way generating a more accurate TIN vs just working with the DSM and DTM generated. What I'm doing right now, with the resources I have, is draw polylines directly on the point cloud using agisoft and exporting this to arcmap were I generate a TIN based on those 3D polylines. This is time consuming and in some cases not as accurate as using the stereo pairs, which isn't an option with UAV data because of the amount of images generated in a flight.

I found two software that show how to create breaklines from point clouds, but really don't know how they would work in certain conditions where lots of vegetation is present. One of the is Carlson Software and the other is virtual surveyor. If anyone has worked with any of this please provide some feedback or if you have a much better aproach it would be interesting to hear about it.

I must also add that I'm not a photogrammetrist, my background is more based on GIS software but with no photogrammetry training, everything I've learned about photogrammetry has been through experience.

Best,

Santiago

18

General / Making 3D print of a open pit

« on: August 16, 2018, 02:38:19 AM »

Hi Everyone,

I want to make a 3D print of a open mine pit. Since it's a hole and I have little to no experience with 3D models, I work Agisoft exclusively for photogrammetry purposes, I wanted to know how can I close the hole or what the approach would be to make a 3D model of this open mine pit. Is there a way with software like Mesh Lab to make walls and a floor to the model and be able to close it.

Thanks,

Santiago

19

General / How to avoid this effect in orthophoto

« on: June 18, 2018, 10:05:27 PM »

Hi Guys,

I've been seeing this effect whenever there's a change in light in the images. Where there are shadows and direct sunlight just between them I'm getting this effect that affects the quality of the ortho. Any way to work around it.

Best regards and thanks,

Santiago

20

General / Urgent! Aerial Triangulation File, Format inquiry

« on: February 09, 2016, 10:54:10 PM »

Hi,

A client is asking for the aerial triangulation files. I'm trying to figure out which files, of all the files I can export with Agisoft, are the ones he needs and how can I open them and view the AT files. Not sure if this files are the camera positions or the matches (or if some other file), which I can export by going into tools, export, cameras or matches. My client uses ArcMAP to view the files so I would need a format compatible with ArcMAP.

They didn't specify a format.

Thanks for any help and best regards,

Santiago T

21

General / Re: Measurement Accuracy

« on: June 12, 2015, 08:54:00 PM »

Hi ankur6ue,

Have you tried using markers that you know exactly how much they measure. I tried it once for a 3d modellin of a vehicle and the accuracy was very good. You could try measuring a corner of the house, where you would give that corner a starting point of 0, 0, 0 in XYZ or lat, long, alt. Then you could create 3 end points and in markers input the distance between the corner and those 3 end points.  Having done that everything would be scaled based on those know points. You could do this for several parts of the house which you know exactly how much they measure (by using a measuring tape).

I think this should work. Sorry if it isn't clear enough.

Best regards,

Santiago

22

General / Re: Mapping Vegetation and agriculture

« on: January 26, 2015, 07:34:32 PM »

Hi Sultan,

Try creating a final mesh with only the ground points (creating a DTM), be sure to leave only the ground points when selecting them because the automatic tool to do this doesn't work perfectly. After that try exporting the orthophoto again and see if the result seems better. Follow this link to the tutorial on making a DTM with agisoft http://www.agisoft.com/index.php?id=35

Best regards and hope it helps,

Santiago

23

General / Re: Memory consumption for EXPORT TILES

« on: January 05, 2015, 09:42:29 PM »

Hi I'm getting an intant crash when trying to export tiles. I've tried several parameters for the tile and pixel size of the model. I want to try the agisoft viewer. Does anyone else has this issue. The issue just says can't export model and this error doesn't occur when exporting the 3D model.

Best,

Santiago

24

General / Mosaic Resolution, Orthophoto Resolution

« on: October 08, 2014, 05:35:14 PM »

Hi,

I have the following issue with a very huge project I'm working on. I have over 2000 images taken between 250-400 m above terrain in a very variable terrain. The project consists on 86 km from which I made two flight lines. The terrain varies from 2000 m above sea level and goes to nearly 1000 m above sea level, if this matters. The images all have very good overlap and I've been having mainly 2 major issues.

1. I can't manage to align the images correctly although I have the GPS position for everyone of them. I haven't tried chunks because I've never worked with chunks before and I'm afraid the merging will not be as good as if I process everything in a single run, although I may be wrong. If anyone has had good experience with chunks please let me know.

2. I've managed to create 2 separate projects were all the images are aligned. Using this I created 2 mosaics, but the issue I have now is that the mosaic creation is telling me the resolution will be around 50 cm when the resolution should be between 10-15 cm or so.

I've attached an example of the image with the worst resolution during the flight and a zoom in showing the resolution it has. The final resolution should be something similar to this I believe.

If someone knows how I should approach this project please let me know.

Best,

Santiago

25

General / Re: Photogrammetry - Sphere-like effect on the ground and no accuracy

« on: August 05, 2014, 05:21:43 PM »

Hi dyrvar,

I think what you're seeing is the bowl effect. What's the accruracy of the GCP's you're using? This might be the cause of the bowl effect you're experiencing.

Please check this link for a solution. hope it helps.

http://www.agisoft.ru/forum/index.php?topic=600.0

Best,

Santiago

26

General / Re: Wavy trees and errors ob building edges

« on: June 19, 2013, 01:54:23 AM »

Hi Herman,

Thanks for your reply. So you say the building edge issue is because of relief distortion. For what I understand about relief distortion, is that's one kind of geometric distortion that occurs for taller objects that are further away from the center of the picture, but in this case that building is in an image that contains the whole building pretty much in the center of the picture. But if it was certainly caused by relief distortion what can I do to correct this issue, because I would most likely love to present an excellent final result to my clients. I attach the image where the building is contained almost in the middle.

When you say movement between pictures in the vegetation issues. Do you mean like movement of the UAV that causes blurry or tilted pictures or what do you mean exactly?

One thing I forgot to say is that I dind't use any GCP's, I'll use some next time to see if there are any improvements.

I would love to see some good results any of the users of Agisoft have of building edges, just so I know it can actually be achieved without any mosaic editing tools, or if i'm just expecting something not yet possible.

Best regards to all and thanks Herman,

27

General / Wavy trees and errors ob building edges

« on: June 11, 2013, 06:28:49 AM »

Hi everyone,

I was wondering how could one avoid this mistakes on the orthomosaic and is everyone getting this kind of mistakes always, or are you getting true orthomosaics with perfect quality.

What are the causes of this mistakes? Incorrect camera parameters? Poor overlap? Altitude of the flight? Type of lens used?

Thanks for any help and guidance you guys can give me and many others who I'm sure face this same issues.

Best regards,

Santiago

28

General / Re: Synchronizing GPS clock and camera Clock for geotagging

« on: June 04, 2013, 03:30:50 AM »

Thanks guys

You both have been very helpful I'll give it a try and let you know.

Best regards,

Santiago

29

General / Re: Synchronizing GPS clock and camera Clock for geotagging

« on: May 13, 2013, 08:14:56 PM »

Synchronising GPS and camera clock is quite easy: just take a photograph of the GPS time displayed on a handheld GPS device (including seconds) before and/or after the flight. It does not have to be the same device as the one that's flying with the UAV, because all GPS devices are synchronised via the satellite signal. Just make sure that the GPS already sees satellites and has established its position, otherwise its time may not have been synchronised to the satellites yet. After the flight, look at the photograph showing the GPS time: subtracting the GPS time from the photograph's time stamp (under file... properties... details) will give you the corect offset. Then, you can use this offset to put it into a geotagging software together with all photographs and your GPS track to assign the correct GPS position to each photograph. Alternatively, you can calculate the correct time and assign the correct GPS position manually or using a spreadsheet software like Excel.

P.S.: Be aware that the flight velocity of you UAV will have an influence of position accurracy: camera time stamps do not include fractions of a second, so your synchronisation is only approx. +/- one second. At 20 m/s flight vecocity, of course this results in a position error of +/- 20 m in addition to the GPS error of +/- a few metres. Flying a lawnmower pattern you can hope (bout not be sure) that much of that error will be cancelled out.

Hi Ralph,

Thanks for your reply. I did try using a handheld device to synch the camera to it, but my handheld GPS doesn't display the time or at least I wasn't able to find it, also there's the issue with the camera which doesn't show me more that minutes. It's a sony nex 5 so if anyone knows if the time could be displayed as 12:00:00 that would be great. Thanks anyway Ralph at least I know how it must be done now. Also which geotagging software do you use, right now I'm using geosetter, but with it I have to geotag one image at a time, I would want a software that allows me to do a more efficient geotagging.

Best regards and thank you,

Santiago

30

General / Synchronizing GPS clock and camera Clock for geotagging

« on: May 09, 2013, 01:27:36 AM »

Hi all,

I have the following inquiry. I work with multirotor UAV's for mapping purposes. I have to geotag each photo by using the route I planned so I just plot in the lat and long of the waypoints I planned. I know this final method may result in an error augmentation do to positioning errors the kopter has in the air.

I've seen in some websites that the camera's clock should be synced to the GPS UTM clock. To be sincere I have no idea how to do this, I don't even know how to look at the clock of the MK's GPS. I've looked in many forums, but I haven't found anything useful. Also another problem I see is that the way the time is displayed in the pictures my camera takes (Sony Nex 5 and 5N) has only precision of minutes. For example 12:34, not 12:34:23. Hope someone can help me out by telling me how to synchronize them and use this data to geotag the pictures with more precisi?n, probably using the GPX data from the mikrokopter.

Thanks and best regards,

Santiago