Proposal:Catchment
| Catchment Areas | |
|---|---|
| Proposal status: | Abandoned (inactive) |
| Proposed by: | chrisb8 |
| Tagging: | boundary=catchment_area |
| Applies to: | 
|
| Definition: | A tagging proposal for catchment areas |
| Statistics: |
|
| Rendered as: | none |
| Draft started: | 2012-12-01 |
Rationale
Lots of amenities have a catchment area (the area in which they provide their service(s)), but there is currently no way represent this information. We propose a tag to associate catchment areas with amenities.
Examples
Places that might have catchment areas:
- Medical Facility
- Hospitals
- Dentists
- Doctors’ Surgeries
- Schools
- Places of Worship
- Postal Depots
Usage
A boundary relation should be created to describe the catchment area.
Relation tags
| Key | Value | Discussion |
|---|---|---|
| type=* | boundary | This relation describes the boundary |
| boundary=* | catchment_area | The type of boundary, in this case the catchment area |
| catchment_type=* | a catchment type | Optional, the catchment area for some subjects is inferred from the tags on the subject, or it can be tagged with one, or many of the values in the table below. |
Catchment Types
| Type | Description |
|---|---|
| ambulance_service | Applies to a facility providing ambulances |
| vaccinations | Applies to a facility providing vaccinations |
| school_bus | Applies to the area served by the bus for a school |
| school_admission | Applies to catchment area (for admissions) to a school |
Relation members
| Element | Role | Recurrence? | Discussion |
|---|---|---|---|
|
outer | one or more | The multiple ways that form the closed border |
|
|
inner | zero or more | Enclaves of this border - the multiple ways that form the closed inner borders |
|
subject | one or more | Node representing the objects that this catchment area relates to |
School
For a school tagged as a closed way with amenity=school, to represent the catchment area, a relation is created describing the catchment area using the outer and inner members, the school way is the subject member of the relation. If multiple schools share the same catchment are, multiple subjects can be added.
Medical Facility
For a medical facility, tagged with amenity=hospital, if the hospital has a catchment area, it is the subject of the relation. The boundary is then tagged by using the outer and inner members.
Application
This feature has been explicitly requested by the US Peace Corps, as part of the Granular Health Mapping (http://www.rhok.org/problems/granular-health-map) Random Hacks of Kindness (http://www.rhok.org/) problem. If implemented, the feature could quite possibly be used by many Peace Corps volunteers to analyse health problems and needs in developing countries.
Some of the use cases our contact person at the Peace Corps sent are:
1. „When developing a logistics plan for mosquito net distribution, since the head nurse of a clinic tends to be responsible for his/her area, it's useful to be able to see both the roads and the catchment areas to determine which villages are covered by whom (or which facility as it were). Often this logistics planning happens in a meeting, so I'm seeing printing out a map with roads, health facilities and their catchment areas overlaid.“
2. Analysis like: What percentage of the area of this catchment is more than 7km from the Hospital? How many people (joined with population data) are in the catchment of a certain hospital? This is valuable for e.g. journalists, health planners (staffing, resources), insurances, emergency response.