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2D markers

You can analyse your drone photos in Agisoft, a programme that performs photogrammetric

processing of images and creates 3D spatial data. When you analyse your drone photo's in Agisoft you

will have to align your photos. This is done by manually finding ground control points (GCP) (objects)

in your photo. You tell the program that this particular object, say a parked car, is the same car as in

the next photo and the next and so on. The computer will the stitch all these photos together (align)

and create one large image which will later be transformed into an orthomosaic or DEM. This method

is very time consuming and therefore Agisoft has developed a set of 2D markers which you can print

in A3 format on paper (and then laminate them to protect them from moist and rain) and place on the

ground in your flight area. These markers will function as your ground control points. Later, when you

are analysing the photos, Agisoft will recognise these markers and automatically stitch all photos

together. The markers look like such:

When you are using 2D markers in the field, it is important to keep a couple of things in mind:

The more markers you use, the better Agisoft will be able to stitch the photo's

together. In every photo taken by the drone you would ideally see at least one

marker but two or three is best (in theory).

Fix them properly to the ground, so they can't be moved by the wind. You can bring

herrings to fixate them, but it is advisable to also put something on the sides so

they don't curl up.

Choose strategic places. There should be markers in the corners and at the borders

of your flight area, but also in the middle. Evenly distribute them and if you are

also working with 3D markers, make sure there is enough distance between those

too.

Check the weather. Ideally you avoid rolling cloud cover as this creates shadows

and inconsistent light in your imagery. A sunny day with blue skies could create

oversaturation in your photos. It is best to have consistent lighting in your photos,

so plan your missions in advance and if you have no other choice, adjust the ISO

sensitivity manually on your iPad while the drone is taking photos to counteract

the effect of clouds or oversaturation.

Adjust the drone height. Depending on the weather, the markers can be seen up

to approximately 20 meters. If you are flying at a height of 40 meters, there is no

point in placing markers as the pattern on them will not be visible in the photos.

Last updated March 27 2020

DJI Phantom 3 Advanced Manual

Page 14 of 16