Assumptive risk model for illegal activity occurrence in QGIS

Ri — Sun, 04 Jul 2021 07:35:07 GMT

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:

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:

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.

Re: Assumptive risk model for illegal activity occurrence in QGIS

DanPatterson — Sun, 04 Jul 2021 08:19:51 GMT

Geographic Information Systems Stack Exchange

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

topic Re: Assumptive risk model for illegal activity occurrence in QGIS in Implementing ArcGIS Questions

Assumptive risk model for illegal activity occurrence in QGIS

Re: Assumptive risk model for illegal activity occurrence in QGIS