Assumptive risk model for illegal activity occurrence in QGIS

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07-04-2021 12:35 AM
Ri
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Hello,

I'm hoping someone can help me with one aspect of my master's dissertation. I'm investigating the spatial distribution of illegal activity (poaching, logging, encroachment, etc.) occurrence in a Nigerian forest reserve. I want to establish a risk model based on the following assumptions:

Variable

Criteria

Risk Outcome

Forest cover

If forest cover = low

0

If forest cover = moderate

1

If forest cover = high

2

River

If nearest river > 2km

0

If nearest river ≤ 2km

1

Road

If nearest road > 2km

0

If nearest road ≤ 2km

1

Community

If nearest community > 2km

0

If nearest community ≤ 2km

1

Ranger post

If ranger post ≤ 4km

0

If ranger post > 4km

1

 

where the sum of risk outcomes is equal to a total risk value for a given point on the map.

My overall goal is to create something like this:

10.1177_194008291600900127-fig5.gif

I'm learning QGIS for the first time so have been having trouble with some methods. So far, I've tried using the semi-automatic classification plugin to classify forest cover into the three classes (low, moderate, high) but have run into a python error message each time. Now I've managed to get to this:

Screen Shot 2021-07-04 at 8.03.28 AM.png

 However, there is no attribute table and I'm unsure of what the symbology values represent. 

My first question is: (a) how do I group these symbology values into three classes, and (b) is it possible to definitively classify pixels based on these values for use in a model?

Second: how can I approach establishing a risk model based on the assumptions I've outlined? Does anyone know of a plugin or user-friendly method where I can set specific risk values to each area?

I've managed to do buffers quite easily but realized it isn't helpful for what i want to do because there's a confusing amount of overlap. It also doesn't help for the forest cover classification anyway. 

As I said, I'm quite new but have played around with a few methods and haven't had any luck. I'd really appreciate any advice at all! 

Thank you in advance.

 

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DanPatterson
MVP Esteemed Contributor

Geographic Information Systems Stack Exchange

If you aren't using ArcMap or ArcGIS Pro, you would be advised to post on that site


... sort of retired...

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DanPatterson
MVP Esteemed Contributor

Geographic Information Systems Stack Exchange

If you aren't using ArcMap or ArcGIS Pro, you would be advised to post on that site


... sort of retired...