I want to know if I set GCP and measure (survey) them, fly the area (dirt pile) and process that. At some point in the future, a client will do some more dirt work either adding or removing to the pile, if I refly it with GCP can I get pix to calculate the difference?
I saw some article about that already but I wanted to expand on this with:
Does it make a difference if I cannot use permanent GCP points due to the area being changed too much. can I survey in new and different GCP each time to tie the data together?
If you have two projects at two different moments in time of the same area. The workflow I usually recommend is to compute the volume of the area of interest in each of them and then calculate the difference, e.g. in an Excel sheet.
If the base surface of the volume remains the same and you add or remove some volume from the pile, a trick is to export the base surface in one project and import it in the second, so that the comparison is more accurate. This will avoid clicking errors.
As for the GCPs, I think it is not an issue as long as you use GCPs in both projects. The accuracy of the reconstruction will be similar in both, as long as the GCPs are well distributed over the area and if possible close to the volume of interest.
Maybe other Community users who compare volumes regularly can share their workflow and tips too. :)
Hello, I have been tasked with calculating quantities on a large area and would rather do it with the drone and Pix4D vs walking. So here is my question: How can I fly a site one week and then fly it again a week later and get the volume difference between the two flights using Pix4D?
If you have two projects at two different moments in time of the same area. The workflow I usually recommend is to compute the volume of the area of interest in each of them and then calculate the difference, e.g. in an Excel sheet.
If the base surface of the volume remains the same and you add or remove some volume from the pile, a trick is to export the base surface in one project and import it in the second, so that the comparison is more accurate. This will avoid clicking errors.
As for the GCPs, I think it is not an issue as long as you use GCPs in both projects. The accuracy of the reconstruction will be similar in both, as long as the GCPs are well distributed over the area and if possible close to the volume of interest.
Thank you so much for the response! Would using Pix4Dbim maybe be a better option for this? This type of calculation as well as doing as-builts is the majority of what my drone flights are for.
If you want to use the cloud platform. In that case, Pix4Dcloud Advance would be the best option for you because it will allow you to add the GCPs and provide the feature such as volume comparison. For more information, I would recommend you to go through our blog on Introducing Pix4Dcloud & Pix4Dcloud Advanced.
Just for your information, we no longer offered a Pix4Dbim license. However, the new Pix4Dcloud Advanced is equivalent to Pix4Dbim with additional features.
The link to the article provided above no longer exists, is there another link or article that would help with the volume calculations between two flights of the same area?
We - and our partners - use cookies to deliver our services. By using our website, you agree to the use of cookies as described in our
Cookie Policy
These cookies are necessary for the website to function and cannot be switched off in our systems.
They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences,
logging in, or filling in forms. These cookies do not store any personally identifiable information.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site.
They help us to know which pages are the most and least popular and see how visitors move around the site.
All information these cookies collect is aggregated and therefore anonymous.
If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
These cookies may be set through our site by our advertising partner (Google).
They may be used by Google to build a profile of your interests and show you relevant adverts on other sites.
They do not directly store personal information but are based on uniquely identifying your browser and internet device.
If you do not allow these cookies, you will experience less targeted advertising.