Changeset: 62211756
Coconino National Forest, forest cover, north of Flagstaff
Closed by tomthepom
Tags
created_by | JOSM/1.5 (14178 en_GB) |
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source | Bing, NLCD 2011 imagery (USGS) |
Discussion
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Comment from Nakaner
Hi tomthepom,
I looked at the Bing imagery and the USGS imagery layer available at JOSM but I still do not know how you were able to draw the boundary of the forest near https://www.openstreetmap.org/node/5875207168#map=18/35.31432/-112.07764
Could you please explain what "NLCD 2011 imagery (USGS)" means to you and where I can find that imagery?
Best regards
Michael
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Comment from tomthepom
Hey Michael
The NLCD2011 imagery is a set of geotiffs published by the USGS here - https://viewer.nationalmap.gov/basic/
These show basic land coverage, including tree cover. The boundary between wood and scrub is, approximately 50% tree canopy cover.
I haven't completed this area yet, so it will be updated in the next few days.
There are discrepancies between the NLCD 2011 imagery and the Bing imagery - which is dated 2014 for this area - due to felling and wildfires between those dates - and due to errors in the NLCD data.Cheers
Tom
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Comment from tomthepom
Hey Michael
Sorry, not 50%. The boundary of forest in NLCD is defined as 'areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover'.
Cheers
Tom
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