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Topics - Phogi

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16
Dear Alexey,

May I know what's the unit of marker.position? I searched some threads and know it's in camera plane, is it what is used for (X, Y, Z) - point coordinates in the local camera coordinate system? For a pixel in the camera, could you give an example on how it gets the position values? Also the u/v in camera calibration value would it be expected as millions or few handreds if it's pixels?

My another question is about the classification function, the angle/distance settings are clear, but could you offer some articles on how they are working? Cause sometimes I filter a conveyor and it removes the other points for different densities. Also if the automatic classification can add other classes other than ground?

Thanks a lot!

17
Python and Java API / select cameras by time
« on: August 16, 2018, 07:11:37 AM »
Hi Alexey,

Could you help me with sort camera by time in the python api? I tried

chunk = PhotoScan.app.document.chunk
cameras = chunk.cameras
cam_num = len(cameras)
chunk_N = 0
for i in range(0,cam_num-1,1):
    timestamp = time.mktime(time.strptime(cameras.photo.meta['Exif/DateTime'], '%Y:%m:%d %H:%M:%S'))
    timestamp_next = time.mktime(time.strptime(cameras[i+1].photo.meta['Exif/DateTime'], '%Y:%m:%d %H:%M:%S'))
    if (timestamp_next - timestamp) <= 60:
        cameras.selected = True
        cameras[i+1].selected = True
    else:
        cameras[i+1].selected = False
        break

But it is always not select the cameras, and sometimes select wrong cameras depending on the camera names. I am assuming it needs to sort by time first, however getting a list of camera time does not store the camera id correspondingly.

Thanks a lot for your help,

Kind regards,

18
General / Adaptive Camera Model Fitting which step
« on: April 11, 2018, 03:49:29 AM »
Hi Alexey,

In v1.4, the Adaptive camera model fitting option appears in both "Align Photos" and in "optimise cameras". Is there any difference? As in some threads it is mentioned rolling shutter should be in the sensor so it was moved out from optimising options, but what is the "Adaptive camera model" fitting option does now?

Thanks for your explanations and support!

Regards,

19
General / Camera FC6310 model problem
« on: April 05, 2018, 02:55:43 AM »
Hi Alexey,

I got a flight with photo ratio 16:9, with camera model FC6310. I found Agisoft has some weirdness to add GCP for this kind of photos, each GCP left as checkpoint will have very large RMS, while involved it in the RMS will be very small. However the checkpoints on the site will be still off.

Is there any bug or special settings needed for this kind of photos?

Thanks

20
General / Multiple F/stop and shutter settings with large GCP RMS
« on: February 24, 2018, 05:06:27 PM »
Hi Alexey,

I have had a project with multiple flights due to the area is large, also the F/stop and shutter speed have some changes during the flights. However, the aligned photos have large discrepancy when marked with GCPs and reoptimised. The RMS of the GCPs are always at 0.2m to 1m in Agisoft. Is it related with the F/stop? What I notice is Agisoft treat the cameras into different groups in the camera calibration, is there any suggestions to get a smaller RMS with GCPs?

Another issue I found it once I ticked " with rolling shutter" it will bring about 50m RMS for cameras, do you have any suggestions?

Thank you so much!

21
Bug Reports / GCP unchecked but will impact in camera reoptimising
« on: January 29, 2018, 09:31:59 AM »
Hi Alexey,

I just tried to uncheck the GCPs to leave it as a checkpoint, but it seems the reoptimising will involve the "unchecked" GCPs in the camera model still. Would this be correct?

Could you tell me a bit about the formula used to reconstruct the GCPs with the camera alignment? As the unchecked GCPs how would it be weighted in the formula?

Thank you very much, any comments would be much appreciated!

Cheers,

22
Bug Reports / Canadian NAD83 (CSRS) definition issue
« on: September 20, 2017, 07:50:42 AM »
Hi Alexey,

When I looked at the projection in Agisoft e.g. EPSG:3780 based on NAD83(CSRS), it has the part of "TOWGS84[-0.991,1.9072,0.5129,0.025789907519493,0.009650098960270401,0.011659943232342,0]", while in https://epsg.io/3780 it shows "TOWGS84[0,0,0,0,0,0,0]".

This caused the conversion difference between using Agisoft and other software. Can you tell me which one should be the correct one? Where does the values in Agisoft's definition for towgs84 come from?

Thanks a lot!

Phogi

23
General / Rolling shutter option detail
« on: September 04, 2017, 08:15:33 AM »
Hi Alexey,

Thanks for the rolling shutter option in camera optimising, in some of my datasets it shows smaller RMS for cameras if chosen. However, I found it is also leading smaller RMS for P4p photos, does it look right? Is there any detail of when it should be used in the website of the rolling shutter option?

Thanks a lot!

Cheers,

24
Bug Reports / NAD83(2011) can't directly convert to WGS84 / UTM zone
« on: July 28, 2017, 02:56:10 AM »
Hi Alexey,

Is it because EPSG code defines differently so NAD83(2011) datasets have to be defined on NAD83(2011) and can't convert directly to WGS84 / UTM?

Thanks,

25
Bug Reports / Agisoft Local outputs do not write metadata correctly
« on: July 25, 2017, 07:38:36 AM »
Hi Alexey,

I recently working on the Agisoft's "Local Coordinate Systems" to generate DEM/Ortho/Laz etc., however, no matter which projection I selected (Local ft/m/ftUS), the outputs will not contain the unit in the header, but only leaves "Coordinate System is "" ".

Is this a bug when Agisoft exports local Coordinate System results? If so will it be fixed in the next release or if it will not be fixed in the next few rounds?

Thanks a lot, I'm looking forward to your reply.

Cheers,

26
General / Agisoft model distance question
« on: July 17, 2017, 10:35:20 AM »
Hi Alexey,

When Agisoft import GCPs, is it important that the GCPs are in grid coordinates or ground coordinates?

Thanks,


27
Bug Reports / DEM export error from different ellipsoid
« on: July 17, 2017, 09:45:10 AM »
Hi Alexery,

I found Agisoft export DEM from other ellipsoid like Airy 1930 or AGD66 to WGS84, the DEM will be shifted a lot. For example, if the DEM is on AGD84 with elevation of 110, if I directly export the DEM into WGS84, the elevation will be -35m.

Hope this would be fixed or identified if I did something wrong.

Thanks,

28
Bug Reports / CGVD2013 reports "vertical datum out of range"
« on: June 22, 2017, 06:51:17 AM »
Hi Alexery,

I tried to use the CGVD2013 geoid file, but it reports "vertical datum out of range". I checked the photos and I opened the geotiff they both are in the correct position, is there something wrong in Agisoft 1.3? Also I found NAVD88 12 a and 12 b can be read in, however this geoTIF does not have projection / datum defined, would this be a correct file?

Thanks a lot!

29
General / DJI FLIR camera Pixel size not calculated
« on: June 05, 2017, 11:58:12 AM »
Hi Alexey,

Is it possible that DJI FLIR camera's Pixel size in camera calibration can be extracted? How could we manually calculate it? Currently when I load the FLIR photos in the camera calibration will show "unknown" at the pixel size (mm). The only information shown is the focal length of 13mm.

Thanks a lot.


30
Bug Reports / DEM export wrong by directly changing coordinate system
« on: March 29, 2017, 04:03:05 AM »
Hi Alexey,

We found when exporting DEM in geoTIF generated in OSGB or any coordinate systems which are not based on GRS80, the height doesn't match with it was generated in WGS84 coordinates. For example, I generate a DEM in OSGB epsg 27700, which is based on Airy ellipsoid, and direct export, and when exporting I select the coordinate system as "WGS84", so it should transform to WGS84, and horizontally it does correctly, however, the height is shifted by about 3.8 meters.
See image attached.

This can be corrected by regenerating DEM in WGS84 coordinate system defined, and export would be correct. Would it be a bug or it is not suggested to export in different coordinate system in Agisoft?

Thanks,

Cheers,

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