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change dead link ch04 #769

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change dead link ch04 #769

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2 changes: 1 addition & 1 deletion 04-spatial-operations.Rmd
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Expand Up @@ -796,7 +796,7 @@ agg_aw$value
```

In our case it is meaningful to sum up the values of the intersections falling into the aggregating zones since total income is a so-called spatially extensive variable (which increases with area), assuming income is evenly distributed across the smaller zones (hence the warning message above).
This would be different for spatially [intensive](http://ibis.geog.ubc.ca/courses/geob370/notes/intensive_extensive.htm) variables such as *average* income or percentages, which do not increase as the area increases.
This would be different for spatially [intensive](https://geodacenter.github.io/workbook/3b_rates/lab3b.html#spatially-extensive-and-spatially-intensive-variables) variables such as *average* income or percentages, which do not increase as the area increases.
`st_interpolate_aw()` works equally with spatially intensive variables: set the `extensive` parameter to `FALSE` and it will use an average rather than a sum function when doing the aggregation.

### Distance relations
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