Running RiskScape using same layer for exposure and hazard

Community
1

Hi everyone! I was just wondering if anyone has tried to use the riskscape wizard using the same layer for their hazard and exposure. For example, I have a layer called ‘RoadSide Survey’ which contains my hazards (data for flood velocity, flood sedimentation, flood duration, and flood depth) and my exposure (different farms and their land use types). I’m trying to get riskscape to run just using this layer for hazard and exposure, but I am struggling to do so and was wondering if anyone had any advice.

Thanks in advance :slight_smile:

2

Hi,

What sort of input data is the Roadside Survey layer? Is it a geopackage file? If so, RiskScape can only load one layer from the geopackage file at a time. So what you want to do should work, but your RiskScape bookmarks will need to specify the layer within the geopackage file to use. E.g. something like this:

[bookmark Flood_Velocity]
location = Roadside_Survey.gpkg
layer = flood_veloicity

[bookmark Farms]
location = Roadside_Survey.gpkg
layer = farm_data

But if you’re not using a geopackage input, could you provide a few more details about your input data file?

Hope that helps,
Tim

3

Hey Tim,

Thanks so much for the reply. RoadSide Survey is a shapefile.

4

OK, so what does the data look like? Are there separate polygons for the exposure (farm) and hazard (flood) data?

Or has the hazard already been spatially matched against the exposure data? i.e. there are just farm polygons and they have flood velocity/depth attributes?

5

Kia Ora,

The hazard data has already been spatially matched against the exposure data - there are farm polygons each containing their own flood depth/velcoity/sedimentation/duration.

6

OK, in that case you wouldn’t use the wizard to build the model. Have a look at the following tutorial:
https://riskscape.org.nz/docs/intermediate/table-models.html

Once you’ve been through the tutorial, you could replace the relation parameter with your Roadside Survey shapefile, and replace the function parameter with the Python function that you want to use.

Hope that makes sense.