# Elastic Search using decay\_function for changing score **URL:** \ **Category:** Elasticsearch\ **Created:** [March 28, 2016, 11:18am UTC](https://discuss.elastic.co/t/elastic-search-using-decay-function-for-changing-score/45581 "2016-03-28T11:18:24Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Deep](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@Deep](https://discuss.elastic.co/u/Deep)\ **Post date:** [March 28, 2016, 11:18am UTC](https://discuss.elastic.co/t/elastic-search-using-decay-function-for-changing-score/45581/1 "2016-03-28T11:18:24Z")
Hi , I am trying to use gauss decay\_function with function\_score to modify the score of my documents based on their distance from a geo\_location. How can I specify the offset and scale parameters in miles? According to documentation the default unit in distance is meters (m) and I can use km for kilometers. What should I use for miles? Regards, Deep ---
**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\ **Post date:** [March 28, 2016, 12:42pm UTC](https://discuss.elastic.co/t/elastic-search-using-decay-function-for-changing-score/45581/2 "2016-03-28T12:42:03Z")
`mi` [https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#distance-units](https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#distance-units) is the link. Sorry it didn't jump out at you. It'd be cool to have a link there on the function score page.... ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 11:04pm UTC](https://discuss.elastic.co/t/elastic-search-using-decay-function-for-changing-score/45581/3 "2017-07-05T23:04:44Z")