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Hi Rob,

Following Jarlath's suggestion, I highly recommend the FOSS software InterIMAGE if your College Student is feeling ambitious and is curious to explore measuring desertification with GIS, especially a) within a small extent and b) where there are least two different time periods captured with publicly-available 4-band orthoimagery. If a binary land cover result (i.e., "desertification" v. "other") is reasonable, then the process should be fairly straightforward, complicated slightly with the addition of each land cover class (e.g., desert/other --> desert/coniferous/other --> desert/coniferous/water/other, et cetera). Jarlath's blog includes a lot of great resources and here is another summary of the conceptual process using InterIMAGE

Kindest Regards,

Tom Hamill, GISP

Candidate for M.S. in Spatial Informatics at UMaine

https://umaine.edu/scis/people/thomas-hamill/

https://www.linkedin.com/in/thomas-hamill-gisp/

https://thegisuser.blogspot.com/

On Wed, Nov 25, 2020 at 12:08 PM Jarlath P.M. O'Neil-Dunne <[log in to unmask]> wrote:

*Message sent from a system outside of UConn.*

Hi Rob,
Conceptually, the process can be made rather simple. Using time-series freely available moderate remote sensing data (e.g., Landsat) one can look at changes in NDVI over time. The trick is teasing out seasonal shifts and determining when the vegetation transitions completely to a desert. Rainfall can factor into this as areas that appear to contain no vegetation may just have limited green vegetation due to the season or a drought.

Best,
Jarlath

--
Jarlath O'Neil-Dunne
Director, Spatial Analysis Laboratory
University of Vermont | USDA Forest Service R&D

-----Original Message-----
From: Northeast Arc Users Group <[log in to unmask]> On Behalf Of Robert Pruyne
Sent: Wednesday, November 25, 2020 12:06 PM
To: [log in to unmask]
Subject: Desertification

*Message sent from a system outside of UConn.*

I have a crazy question, I suspect I won't yield anything, but thought it might be worth a shot.

Has anyone on this list done any work on desertification, i.e. the change of land to desert(really just unproductive). I know a college student trying to learn about the process.

Regardless, Happy Thanksgiving all!

-Rob

_____________________________
Robert C Pruyne Jr., GISP, GIS Manager
Rockingham Planning Commission
156 Water Street
Exeter, NH 03833
Direct Line during COVID: 603-285-2088
Direct line: 603-658-0520
RPC Main line: 603-778-0885

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