geohashing

How to write mappings in elsaticsearch for geopoint having lat lon and alt?

由 你离开我真会死。 提交于 2020-01-25 18:44:46
问题 My_Json_File { "addressInfo": { "city": "Wimsheim", "postcode": "71299", "geopoint": { "lon": 48.845877, "lat": 8.821861, "alt": 0.0 } }, "_id": "ac169008-aa5b-4b09-aa9e-3bf3018f316d" } Pls give suggestion on how encounter this "alt" field in geopoint and "_id" field and also write a suitable mappings for above JSON file. Update 1 My_Json_File { "_id": "ac169008-aa5b-4b09-aa9e-3bf3018f316d" "addressInfo": { "city": "Wimsheim", "postcode": "71299", "geopoint": { "lon": 48.845877, "lat": 8

Kibana doesn't show results on tile map

由 落花浮王杯 提交于 2019-12-24 14:48:00
问题 I have approximately 3300 documents with geo_point typed field filled. When I try to visualize my documents on the tile map, kibana says "no results found". I've already tried putting coordinates as: - geohash in string - [lon, lat] array - object with "lat" and "lon" properties - string "lat,lon" All these ways of setting geo_point are allowed according to ES docs. Kibana detects this field as geo_point (there is a globe icon near field name), but nothing shows up on tile map. What's wrong

Cassandra CQL 3 - Prefix Select

由 青春壹個敷衍的年華 提交于 2019-12-23 02:59:08
问题 is there a way to perform a select based on a string prefix using CQL3? For example, consider the following table: Key | Value ------------ ABC | 0x01 ABD | 0x02 BBB | 0x03 I want to select all the keys with the prefix 'AB'. The database will be used to store spacial information, using a geohash approach. 回答1: That is not possible "out of the box"... However, there are some "tricks" people came up with, see these two posts: Cassandra (Pycassa/CQL) Return Partial Match Is there any query for

Python calculate lots of distances quickly

由 大兔子大兔子 提交于 2019-12-20 14:01:43
问题 I have an input of 36,742 points which means if I wanted to calculate the lower triangle of a distance matrix (using the vincenty approximation) I would need to generate 36,742*36,741*0.5 = 1,349,974,563 distances. I want to keep the pair combinations which are within 50km of each other. My current set-up is as follows shops= [[id,lat,lon]...] def lower_triangle_mat(points): for i in range(len(shops)-1): for j in range(i+1,len(shops)): yield [shops[i],shops[j]] def return_stores_cutoff(points

geohash and max distance

由 ぐ巨炮叔叔 提交于 2019-12-18 10:58:06
问题 Two geohash with first 6 characters matching, distance between two geohash is max 0.61km Two geohash with first 5 characters matching, distance between two geohash is max 2.5km Q : What is the max distance (approx) between any pair of bounding box of given geohash of 5 digit length 回答1: The distance between two adjacent geohashes depends on the latitude & longitude of the center points. In order to get an accurate distance of your bounding box you need to get the adjacent boxes, calculate

How to find the nearest geohash in mysql?

由 大城市里の小女人 提交于 2019-12-13 04:58:45
问题 Recently I'm using GeoHash to hash the paired geo-coordinates into a hash value and store it in MySQL. Now I want to find the nearest hash given the other hash. I noticed that MYSQL provide BTree structure to find a range of nearest hashes by using the command "like" in SQL query. The problem is, how could I find the nearest one instead of giving a range since sometimes I don't know the range. Could someone give me a hint? Really appreciate it. 回答1: QuadTile (or GeoHash?) reversibly turns

How does geohash index work in Lucene

由 别等时光非礼了梦想. 提交于 2019-12-09 07:08:42
问题 In lucene spatial 4 I'm wondering how the geohash index works behind the scenes. I understand the concept of the geohash which basically takes 2 points (lat, lon) and creates a single "string" hash. Is the index just a "string" index (r-tree or quad-tree) or something along these lines (such as just indexing a last name).....or is there something special with it. For pre-fixed type searches do all of the n-grams of the hash get indexed such as if a geohash is drgt2abc does this get indexed as

Geohash-Java Search Nearby LatLongs

由 可紊 提交于 2019-12-08 08:19:30
问题 I've been searching everywhere for a clear example of how to use the ch.hsr.geohash to search for nearby locations. I mean, I just need to implement the following situation: 1 - I have a Long latitude and Long longitude. 2 - Convert this latitude/longitude to hash. (I believe it's done by using "GeoHash.withBitPrecision(latitude, longitude, 64)" but I'm not sure what precision is here. I suppose 64bits would be to have the same precision as long 3 - Retrieve a list of latitudes/longitudes

Geohash-Java Search Nearby LatLongs

由 做~自己de王妃 提交于 2019-12-07 02:26:26
I've been searching everywhere for a clear example of how to use the ch.hsr.geohash to search for nearby locations. I mean, I just need to implement the following situation: 1 - I have a Long latitude and Long longitude. 2 - Convert this latitude/longitude to hash. (I believe it's done by using "GeoHash.withBitPrecision(latitude, longitude, 64)" but I'm not sure what precision is here. I suppose 64bits would be to have the same precision as long 3 - Retrieve a list of latitudes/longitudes within 100km distance (I have no idea how to even start it using geohash) 4 - Query objectify objects

How does geohash index work in Lucene

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-03 09:01:26
In lucene spatial 4 I'm wondering how the geohash index works behind the scenes. I understand the concept of the geohash which basically takes 2 points (lat, lon) and creates a single "string" hash. Is the index just a "string" index (r-tree or quad-tree) or something along these lines (such as just indexing a last name).....or is there something special with it. For pre-fixed type searches do all of the n-grams of the hash get indexed such as if a geohash is drgt2abc does this get indexed as d, dr, drg, drgt, etc.. Is there a default number of n-grams that we might want indexed? With this
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