Wrong orientation in SiteScan model created in free flight

HalgeirDahle

Sometimes my models have wrong orientation. One example is this model.  The road cut seems to be overtopped by 10 degrees, but the real situation is the opposite. 

The pictures are taken in a free flight with DJI mini 3 PRO. Out of approx 100 road cut models, 5-10 models have wrong orientation, all of them are tilted towards the road. 

I have computed the same pictures in PIX4D matic, and there the model is perfect. What can be done to solve this?

Pål_Herman_Sund

@HalgeirDahle has rasied this issue as a supportcase with the Norwegian support team with me as consultant. Adding details

• 181 images in total
• They all seem to be oblique or close to horisontal shots of the cut, som are partially covering the road to the west.
• No GCP's and a code-GNSS

I did process the imagery in Drone2Map which seems to produce a "correct" result. With Drone2Map I digitized 4 points which was imported to Site Scan as GCP's. Registering the "GCP's" in Site Scan and reprocessing seems to produce a better result (see https://sitescan.arcgis.com/share/8a0be250-a240-4452-92a3-31d6a37fb1ff). The cut may also be looked at with Google Street View (https://shorturl.at/hrAZ3).

My guess, the current processing engine in Site Scan require more "consistent" flight planning.

Heavy trafficked road, therefor a light drone (max 250 grams) and no GCP's to avoid blocking the road for traffic.

Attachements:

• flight_part.png displays a part of the images location. 
• typicalimage.png is one example of imagery captured. The other images are similar to this sample

best
Pål Herman 

Flight_part.png

TypicalImage.png