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clarified equalness in isolines

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csobier
2016-04-13 12:21:38 -04:00
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doc/isoline_functions.md
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# Isoline Functions
[Isolines](https://cartodb.com/data/isolines/) are contoured lines that display calculated levels over a given surface area. This enables you to view polygon dimensions by forward or reverse measurements. Isoline functions are calculated as the intersection of areas from the origin point, measured by distance (isodistance) or time (isochrone). For example, the distance of a road from a sidewalk. Isoline functions through CartoDB are available by requesting a single function in the Data Services API.
[Isolines](https://cartodb.com/data/isolines/) are contoured lines that display equally calculated levels over a given surface area. This enables you to view polygon dimensions by forward or reverse measurements. Isoline functions are calculated as the intersection of areas from the origin point, measured by distance (isodistance) or time (isochrone). For example, the distance of a road from a sidewalk. Isoline services through CartoDB are available by requesting a single function in the Data Services API.
_**This service is subject to quota limitations, and extra fees may apply**. View the [Quota Information](http://docs.cartodb.com/cartodb-platform/dataservices-api/quota-information/) section for details, and recommendations, about to quota consumption._
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## cdb_isodistance(_source geometry, mode text, range integer[], [options text[]]_)
Displays a contoured line on a map, connecting points to a defined area, measured by an equal range of distance (in meters).
#### Arguments
Name | Type | Description | Accepted values
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## cdb_isochrone(_source geometry, mode text, range integer[], [options text[]]_)
Displays a contoured line on a map, connecting points to a defined area, measured by an equal range of time (in seconds).
#### Arguments
This function uses the same parameters and information as the `cdb_isodistance` function, with the exception that the range is measured in seconds instead of meters.