Any tips for low level maps?

Hi I’m very new to the forum so if this question has been asked and answered please post the link.

My problem is I am doing some NDVI work for a farmer growing strawberries vertically on 8 foot tall poles, he needs me to be able to see the plants top to bottom on the NDVI survey. I am using a Phantom 3 with modified camera. To get that kind of resolution I need to fly low, very low less than 20 meters.

Is there anything I can do to help the map engine stitch together areas with little variation?
I have done the survey at 66 feet , 80 feet ,125 feet, 250 feet and 300 feet and every map bar the 300 ft map had issues.

I was thinking of running coloured surveyors tape down the rows where there are no boundaries, fence lines, roads, tracks etc. to give the map engine some points of difference.

Anyone tried something similar?

This would also be useful in orchards, vineyards, olive groves etc

Thanks

What overlap are you using? It’s recommended that you use a minimum of 70/70 side/front overlap. Most pros are using 80/80. Also, I know this isn’t a large area but this post from DD is chock full of helpful tips: https://blog.dronedeploy.com/how-to-map-large-areas-6a27d325751

Hi Kara
Overlap is 80/80 and I fly as slow as possible but the centre of the field never stitches correctly as there are not enough points of difference for the map engine to recognise and stitch together hence the surveyors tape to try and artificially create those differences. I have read that post before but it may be time for a revisit

Thanks
Matt

Hi Matt, please do. I think there are some great AG webinar recordings in http://resources.dronedeploy.com where the experts give a lot of useful advice. Sorry I can’t be of more help. I’d also check out https://www.facebook.com/groups/CommercialDroneMapping/ - I would bet some of the group’s members could have tips for a more advanced question like this.

Hi Matt

It is harder to correctly stitch imagery at lower altitudes. One quick suggestion is to take some oblique shots.

We are actively working on better agricultural stitching, so watch this space.

Mike