Comments on: Jukola 2014: Two maps of the terrain!

By: Jagge

Jagge — Fri, 03 Jan 2014 09:44:43 +0000

Intresting comparison. Terje and I will learn things from each other for sure here.

As terve wrote Karttapullautin did not originally detect dense vegetation under high canopy that well year ago, but the whole vegetation detection has been re-written last spring and it has been doing it pretty well since.

By: Jan

Jan — Fri, 03 Jan 2014 09:02:41 +0000

Thanks, Terje! Very interesting.

By: Terje Mathisen

Terje Mathisen — Fri, 03 Jan 2014 09:01:25 +0000

The main difference between our two maps is in the vegetation classification, my default settings (without feedback from either an old map or a short survey trip) is more likely to classify this area as white forest. OTOH my approach can also locate areas of dense brush vegetation underneath a high canopy, i.e. green stripes in white, something which Kartapullautin has problems doing.

The video from the organizers show that the areas that haven’t been logged are very nice indeed, but high-res orto photos indicate that at least some of the old logged areas should have been more green on my map.

I am currently taking samples of the terrain based on those aerial images, generating LiDAR height histograms in order to fine-tune my classification.