OpenTreeMap / otm-core

OpenTreeMap is a collaborative platform for crowdsourced tree inventory, ecosystem services calculations, urban forestry analysis, and community engagement.
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Eco Benefits Extrapolation is Not Explicit #2367

Open jmorrison1847 opened 8 years ago

jmorrison1847 commented 8 years ago
  1. Start with a map of empty planting sites, e.g. https://www.opentreemap.org/walthamdemo/map/ screen shot 2015-12-03 at 10 14 45 am
  2. Edit a single planting site by adding a species and diameter. screen shot 2015-12-03 at 10 15 42 am
  3. Total eco benefits will display as a disproportionately large number based on 1 tree out of the total screen shot 2015-12-03 at 10 16 16 am
  4. Adding a second and third tree with species and diameter (different species from each other and the original tree) produces no effect. screen shot 2015-12-03 at 10 18 29 am
RickMohr commented 8 years ago

I think this is as intended. We know there are 849 trees. Since we don't have a species/diameter for all of them we extrapolate based on the species/diameters we do know. In this case we only know one species/diameter so we extrapolate that they are all the same. In practice this is an unlikely case. It's more common to have a lot of data so the extrapolation has more meat.

maurizi commented 8 years ago

@jmorrison1847 Did you start with a map of empty planting sites, or with a map of trees without a species and diameter? According to the counts, all of the dots on the map are trees.

jmorrison1847 commented 8 years ago

This makes sense! Thanks @maurizi and @RickMohr for the explanation. I'll change the title to more accurately reflect the confusion I was having.

RickMohr commented 8 years ago

@jmorrison, it's explicit but very small. See the line at the bottom of your step 3 image saying "Based on 1 out of 849 total trees"?

jwalgran commented 8 years ago

I would like to propose linking to a "methodology" page that explains our eco calculation process.

dboyer commented 8 years ago

I agree with @jwalgran that a methodology page would be useful. This could likely also include a few resources on i-Tree.