Topics

31

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!

32

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.

33

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,

34

General / DEM error but GCP RMS is very small

« on: March 22, 2017, 10:43:32 AM »

Hi Alexey,

I met a similar issue as the thread showed before: http://www.agisoft.com/forum/index.php?topic=2151.15
But I tried both uncheck the geotags or set the GCPs to 0.001 etc., the DEM comes out will be varied to about 10 cm at some GCPs.

Could you give some suggestions of how can force the model to match with the GCPs better?

Thanks a lot.

35

Bug Reports / NAD83 (2011) Prj fail in meta data

« on: November 16, 2016, 06:10:40 AM »

Hi,

I'm trying to work my data on NAD83(2011) epsg: 6318, but then when I export the DEM, its metadata will give

GEOGCS["NAD83(2011)",
    DATUM["unknown",
        SPHEROID["GRS 1980",6378137,298.2572221010002,
            AUTHORITY["EPSG","7019"]],
        AUTHORITY["EPSG","1116"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","6318"]]

The prj is defined by PhotoScan. The same issue will happen if I define my prj with geoid definition in it, that the PROJ will be "unknown" in this case.

Is it a bug or I misunderstand the way it should work?

Thanks a lot for any help on this.

36

General / combined prj file error

« on: November 09, 2016, 04:06:42 AM »

Hi,

I'm trying to project the coordinates with adding the geoid 12B file, however, when I combined the prj file PhotoScan gives me error message "vertical datum missing". Can anyone help me to find what's wrong in this prj definition?

The prj file is attached.

Thanks very much!

37

Python and Java API / importDEM python error

« on: October 25, 2016, 10:01:42 AM »

Hi everyone,

I'm new to using Python scripting for PhotoScan, and I found in the manual there is an "importDem" function. I have a geotiff DEM, but when I use the command chunk.importDem('path.tif'), I will get

Finished processing in 0 sec (exit code 0)
and False

Then Error: Empty frame path. I searched this error and tried to use doc.save before this step, but still can't import the DEM file.

Can anyone help me with this problem?

Thanks a lot.

Best regards,