Want to talk about soil? Join us for Open Call every Tuesday until Mar. 30 and our kick-off call on this topic on Feb. 2! Click here for details on how to join!

Public Lab Research note

MapKnitter map of Prairie Island One

by jkpetter | August 29, 2016 15:09 29 Aug 15:09 | #13404 | #13404


Pole Mapping of Prairie Island: Trial One Difficulties: maintaining consistent angle, perspective, lighting, scale Technique: 3-4 images from plot edges Overall Goal: Identify Plant species, monitor growth overtime, emerging species placement Uses: cross reference for ground level survey/ assay techniques


Hi Durham peeps! Do you want any help stitching this map?

Is this a question? Click here to post it to the Questions page.

Reply to this comment...

neat! a few of us have been experimenting with taking a series of "donut" or circular panoramas at set points. https://publiclab.org/notes/ranon/08-10-2016/reconfigurable-rig-pole-configuration-and-github-repository#Pole+Panorama+Method

Reply to this comment...

Hi Liz! Yes, could we have a guest in the next few weeks with you?

Is this a question? Click here to post it to the Questions page.

Reply to this comment...

Sure! Also we should ask if anyone else in the grassrootsmapping group would like to be "armchair" support with your team.

Reply to this comment...

Thanks @mathew! I will try this method out, looks good for helping to maintain uniformity!

Hello @Liz and @TaraMei I would love some insight and guidance, this would be awesome!

Reply to this comment...

Hi @jkpetter,

It looks like a lot of your pole aerial photos are oblique (angled). If your goal is to make a map of the prairie area, photos taken with the camera always pointed straight down will be much easier to stitch together. Such nadir photos avoid much of the perspective distortion of oblique photos and can be more easily stitched into planar orthophoto images. If photos are taken throughout the seasons, different orthophotos (aerial map images) can be more easily compared to each other, especially if the same control markers (rocks, stakes) appear in each map.

One easy way to ensure that the camera always points down is to suspend it from the pole with a hanging rod or stiffly flexible tubing, but there are other ways to get mostly nadir photos. Here are some research notes with photos and video of some DIY gadgets for controlling the angle of pole photos: https://publiclab.org/tag/pole-bracket


Reply to this comment...

Good morning @cfastie,

Thank you for the insight and recommendations! Will give that a shot at max height on the pole!


Reply to this comment...

Login to comment.