-I have a Phantom 4 pro V2, and plan to survey a wide area: 5.75 km long and 7 km width in the bush, I have only 2 batteries, and 1 drone. can pix4D capture assist to cover this area, and see all block i am mapping? and how can I proceed. not sure to get internet access in that area, in an northern part of Cote d’Ivoire in a village.
-The second question can I know in advance how many image I will need to process and can PIX4D do that? the gaol of the study is to get a DTM and also an ortho photo,
How many GCPs can I set for this large scale project?
Some clarifications, higher you fly, less images you will need to cover the whole area and lower will be your resolution (high GSD)
Therefore you flight plan (number of images) will depend on your needs (the desired resolution for your DSM and Ortho).
Internet connection is not required when using Pix4Dcapture. However do not forget that your drone cannot fly further than 2 km from the starting point otherwise the contact with the device will be lost.
Therefore you will need to set at least several missions to ensure that your drone stays in the connectivity zone.
I recommend you to plan several missions with significant overlap with 5 to 10 GCPs in each project (More GCPs do not contribute significantly to increase the accuracy) and then merge them into different projects.
We have done some tests with our application.
If you use Pix4Dcapture and your furthest point is at 1000m, you will get a message saying " The drone might fly too far to ensure good connectivity during the mission". But it will not impede you from flying.
However if your furthest point is at 2000m, during the takeoff checklist you will get this message " Drone-Grid distance too large" which in this case will impede you from flying.
We recommend you rather to plan several flights with enough overlap and then merge your different projects.
You can still fly manually your drone at further distance and take image but beware with batteries.
thank you, I have devided my area in 1 sq km area, I get 56 area to cover with 56 flights. there is few hill on the area so it will help me adjust fly elevation.
I planned to set GCPs as tie points so that I can merge the projects easily later. Do I need also to set other GCPs inside (5 or 10) so that can be used later the the big merged project?
see google image. (red dot GCP tie point, green dot, GCPs for merged project).
Usually it is recommended to have 5-10 GCPs per sub-projects. However it is possible to merge sub-projects that do not contain GCPs.
In the shared area it is good to have GCPs, but it will be more important to add MTPs (manual tie point) that are necessary for the merging.
I would like to mention that you are very optimistic with your project. Because having 56 flights with an average number of images about 500 images would result in a 28000 images projects which is really huge. Largest Number of Images
If you do not have a very powerful computer, I doubt that you can really merge all your sub-projects together.
For such large project, it is recommended to work with large frame cameras.
thank you for the advise, im around 560 image per block. and my laptop is prety good, a Alienware 15R2, 32 go ram, buying a ssd to process quikly; and my data are very well overlapped.
Could you clarify the issue your are facing?
You mean that you have three blocks in one of your projects? Or three of your projects have a different projection?
have finally divided the project in 4 block each block containing 14 blocks, dsm, Dtm and ortho photo created.
when done now I visualize the dtm in another software to see if they can stick together, few has different of 1 meter to 10 meters.
but the most strange is that one block have 50 to 20 m difference. I then remake the one I found odd because GCPS was at different altitude with DTM in some area in other area it was fine.
or do you think that I should use each subproject (subproject is made of 14 block of 560 image each) and merge again as a single project to get a single DTM with my laptop configuration.
What do you mean by "The difference come to 1 to 10 between each project"?
Have you been able to complete the 3 steps for your subprojects? Only the first is needed if you want to merge your subprojects.
If you manage to pass the first step then you should be able to merge your projects if they contains MTPs with the same name.
I would like also to recall you that according to our system you are eligible for personal support.
Normally if your subprojects have been correctly processed there should not be any problem in merging.
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.