Hi!

We are starting to pin down the preliminary card content for our Collect Earth baseline for tree-based landscape restoration in Ethiopia. I read the Dryland Assessment and have a few questions (I originally sent an email to drylands.report@fao.org but it bounced back):

1- how the number of trees (counted individually) relates to % tree. What is the added value of using both? My understanding is that the number of trees should be counted over the whole 0.5 ha plot while the % tree is only counting how many of the dots touch a tree.

2- in Ethiopia, trees can be as small as 2 m height. I am wondering if counting both trees and shrubs makes sense. If someone wants to share his/her opinion, I am interested.

3- the LULC map is based on which card: land class or IPCC class?

4- when our area crosses dryland and non-dryland, which hierarchical rule to use? Ideally, people would use different hierarchical rules but in practice, it does not seem realistic.

5- Is crown cover density (from the Dryland Assessment) the same as percent tree (in the CE cards)?

6- the crown cover density map is based on percent tree or number of trees?

7- the number of trees by land use class = average number of trees/ha for a specific land use class x area of that land use class?

8- why the threshold for trees not to be counted is 30?

9- Am I right to think that the map of % tree cover relies on a classification undertaken in GEE with Landsat and uses the spectral value of the central plot point as training area?

10- I realize there are some statistical rules in play that makes that if we have enough points in the area, the plots are representative of the whole area but I am not a statistician and it is hard to grasp. I feel that some of the data collected should not be considered as representative of the whole area but I don't know which ones.... If there are some red flags when interpreting the data from a statistical point of view, thanks for highlighting them.

Cheers and thanks for any help!

Florence

asked 06 Dec '16, 16:40

flandsberg's gravatar image

flandsberg
10112676
accept rate: 0%

Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×281

question asked: 06 Dec '16, 16:40

question was seen: 1,697 times

last updated: 06 Dec '16, 16:40