# Determine carers willingness to walk to access services

This question was posted the Assessment and Surveillance forum area and has 3 replies.

### FRANCK ALE

epidemiologiste

Normal user

14 Feb 2013, 09:26

### Ernest Guevarra

Katilingban

Frequent user

14 Feb 2013, 10:55

```
1 cm 20 cm
-------- = -------- ; x = 20 (0.5 km) = 10 kms
0.5 km x
```

So, the distance d between the two points is 10 kms.
There are other ways of calculating this distance depending on the geographic data that you have. For example, if you have GPS locations of points on the map, there are a lot of online applications that calculate these distances for you or you can apply simple coordinate geometry to get the difference between the two coordinates and come up with the distance.
I hope this answers your question.### Mark Myatt

Counsultant Epidemiologist

Frequent user

14 Feb 2013, 13:22

**adjacent**villages and towns with markets (these are the distances shown on the map). We take the mean "d" and divide by two to give an estimate at the largest distance that carers might be willing to walk to access services. I hope this helps.

If you have any problem posting a response, please contact the moderator at post@en-net.org.