A test flight last week to check out 3D modelling results using the Inspire 1 Zenmuse X3 camera (12mp) with the AutoFlight Logic iOS app and AgiSoft PhotoScan Standard.
What kind of accuracies are you getting with this software?
I am selling my Inspire 1 but I did do some examples to check mass quantities. Worked well for that but I used Pix4d. What is the cost of AgiSoft and is it user friendly?
pencerules, post: 365835, member: 709 wrote: What kind of accuracies are you getting with this software?
I do not have a sense of the accuracies achievable for 3D modelling as the projects I have worked on were for display only. No ground control or scaling were required.
The AutoFlight Logic flight planning software does support image acquisition for orthos and DEMs. You can preset gridded flight lines with user defined image overlaps dependent upon flying height and camera specs (focal length, etc). You can also pause missions to change the aircraft battery.
The image processing in this instance was done using AgiSoft PhotoScan Standard ($179 US). AgiSoft PhotoScan Professional ($3499 US) is required to produce orthomosaics and/or DEMs.
Pix4D has a tool to estimate GSD (ground sampling distance per pixel) that will provide expected horizontal resolution at ground for a given flying height.
https://support.pix4d.com/hc/en-us/articles/202559809-Ground-Sampling-Distance-GSD-#gsc.tab=0
The specs of the Zenmuse X3 camera suggests that a GSD of 5cm per pixel is achievable when referenced to surveyed control point targets. My expectation is that vertical would be in the 10cm range, best case.
Thad, post: 365924, member: 3408 wrote: I am selling my Inspire 1 but I did do some examples to check mass quantities. Worked well for that but I used Pix4d. What is the cost of AgiSoft and is it user friendly?
AgiSoft PhotoScan Professional is $3499 US for a single seat. You can install a fully functional demo version (excluding save and export). I find it reasonably easy to use for the most part.
itsmagic, post: 365929, member: 468 wrote: I do not have a sense of the accuracies achievable for 3D modelling as the projects I have worked on were for display only. No ground control or scaling were required.
The AutoFlight Logic flight planning software does support image acquisition for orthos and DEMs. You can preset gridded flight lines with user defined image overlaps dependent upon flying height and camera specs (focal length, etc). You can also pause missions to change the aircraft battery.
The image processing in this instance was done using AgiSoft PhotoScan Standard ($179 US). AgiSoft PhotoScan Professional ($3499 US) is required to produce orthomosaics and/or DEMs.
Pix4D has a tool to estimate GSD (ground sampling distance per pixel) that will provide expected horizontal resolution at ground for a given flying height.
https://support.pix4d.com/hc/en-us/articles/202559809-Ground-Sampling-Distance-GSD-#gsc.tab=0
The specs of the Zenmuse X3 camera suggests that a GSD of 5cm per pixel is achievable when referenced to surveyed control point targets. My expectation is that vertical would be in the 10cm range, best case.
It would be interesting to run tests to be able to understand what the repeatable accuracy is that can be achieved when using a non-metric lense and applying a camera calibration. Do any of the software you know of allow for a camera calibration? It has been my assumption that a lot of construction, mapping, landscaping, etc. firms would get a drone and some software and subsequently obtain a lesson in why professionals use metric lenses.
Perhaps it is possible if you brute force take a pile of pictures and have a pile of ground control you can achieve similar to survey accuracy, but from what I've seen for the effort currently required you might as well survey the site.
But of course, an old-fashioned CAD file just isn't as "flashy".
The craft is an Ebee with a 16MP Sony. The individual point, elevation inaccuracies are realistically about 0.1' to 0.3'. However, the accuracy of the pile measurements could not be achieved on foot conventionally, which is what matters most to me.
enjoy
[MEDIA=youtube]mW8P3_PpAg4[/MEDIA]
AgiSoft Lens is designed to derive the camera calibration parameters for a non-metric lens. The calibration can be saved and used in both the AgiSoft PhotoScan Standard and Professional editions. AgiSoft Lens is included in the install of both.
A correction. You can run AgiSoft PhotoScan Professional as a fully functional 30 day trial (with save and export) or a demo version (with save and export disabled)
Hi itsmagic,
The 3D model you created looks really good. I was working in a ortho-mosaic, so all the images were taken on the nadir over a residential area. All the features looked good expect the for the side of the houses since there were no images taken on a perspective view. How were the images taken in order to cover the whole model? What was the overlap between the images?
Cheers,
GeomÌÁgico
GeomÌÁgico, post: 366519, member: 11554 wrote: Hi itsmagic,
The 3D model you created looks really good. I was working in a ortho-mosaic, so all the images were taken on the nadir over a residential area. All the features looked good expect the for the side of the houses since there were no images taken on a perspective view. How were the images taken in order to cover the whole model? What was the overlap between the images?
Cheers,
GeomÌÁgico
Hi GeomÌÁgico
I used the AutoFlight Logic iOS app with my Inspire 1 to create circular flight plans around the Erratic with the center of it as the Point of Interest. I started with an orbit of a 50m radius at an altitude of 20m at a velocity of 10kph. The camera was configured to automatically capture an image every 5 seconds, centered on the POI. You can adjust the overlap by adjusting the velocity of the UAV. I manually adjusted the flight parameters to take additional obliques as per the AgiSoft PhotoScan screen capture below. I also used image masks - a tool available in AgiSoft - to remove dynamic elements (people walking on the foot path around the erratic).
itsmagic, post: 366545, member: 468 wrote: Hi GeomÌÁgico
I used the AutoFlight Logic iOS app with my Inspire 1 to create circular flight plans around the Erratic with the center of it as the Point of Interest. I started with an orbit of a 50m radius at an altitude of 20m at a velocity of 10kph. The camera was configured to automatically capture an image every 5 seconds, centered on the POI. You can adjust the overlap by adjusting the velocity of the UAV. I manually adjusted the flight parameters to take additional obliques as per the AgiSoft PhotoScan screen capture below. I also used image masks - a tool available in AgiSoft - to remove dynamic elements (people walking on the foot path around the erratic).
Thank you! Nice work!
Cheers,
GeomÌÁgico