# Will rounding lat / lng in geo\_points result in better performance?

**URL:** <https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444>\
**Category:** Elasticsearch\
**Created:** [July 17, 2017, 6:17pm UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444 "2017-07-17T18:17:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mrdanadams](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mrdanadams/32/13921_2.png) [@mrdanadams](https://discuss.elastic.co/u/mrdanadams)\
**Post date:** [July 17, 2017, 6:17pm UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444/1 "2017-07-17T18:17:42Z")

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I have a `geo_point` location field on every document. Some of these are pretty high precision and we do a lot of `geo_polygon` filters. For our use case, I don't need precision over 4 decimal places. Will rounding these before creating the document result in any performance improvement?

For instance, `[-73.986421834829, 40.7253832828]` will change to `[-73.9864, 40.7254]`

I'm on ES 2.4 (but we are looking to move to ES 5).

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [July 18, 2017, 1:25am UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444/2 "2017-07-18T01:25:59Z")

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It should, yes.

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**Author:** ![mrdanadams](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mrdanadams/32/13921_2.png) [@mrdanadams](https://discuss.elastic.co/u/mrdanadams)\
**Post date:** [July 18, 2017, 1:27pm UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444/3 "2017-07-18T13:27:21Z")

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Thanks! Can you provide any details on why or in what way?

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [July 18, 2017, 8:40pm UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444/4 "2017-07-18T20:40:14Z")

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Because you need to do less work to get a match.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 15, 2017, 8:40pm UTC](https://discuss.elastic.co/t/will-rounding-lat-lng-in-geo-points-result-in-better-performance/93444/5 "2017-08-15T20:40:49Z")

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