Tag：latitude
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Java calculates the distance between the two places according to the longitude and latitude of the two positions
package com. fh. util; This work adoptsCC agreement, reprint must indicate the author and the link to this article
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Java calculates the circumference according to longitude and latitude
package com. fh. util; This work adoptsCC agreement, reprint must indicate the author and the link to this article
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people nearby? Are you Zao?
A few days ago, I received a new demand, which needs to realize a function similar to “nearby people”: obtain all task locations within the distance according to their current positioning. When I first saw this demand, I was a little confused. My first thought was to use the radius formula of the earth to […]
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MySQL function for Geo processing
At present, more and more businesses are based on LBS, nearby people, takeout locations, nearby businesses, etc. now let’s discuss the solution to the business scenario closest to me. Currently known solutions are: MySQL custom function calculation MySQL geo index Mongodb geo index PostgreSQL PostGIS index redis geo ElasticSearch This paper tests the performance of […]
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Sparse regularization of machine learning: L1 regularization
Sparse vectors usually contain many dimensions. establishFeature combinationWill result in more dimensions. Due to the use of such high latitude feature vectors, the model may be very large and require a lot of ram.In high latitude sparse vectors, it is best to reduce the weight to exactly 0 as much as possible. A weight of […]
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Clean up data for machine learning
Apple trees produce both high-quality and moth eaten fruit. Apples sold in high-end convenience stores are 100% perfect fruit. From the orchard to the fruit store, someone spends a lot of time removing bad apples or coating salvageable apples with a thin layer of wax. As a machine learning engineer, You will spend a lot […]
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Python crawls all the electronic eye names in Beijing, and is no longer afraid of being secretly photographed by hidden cameras
The text and pictures of this article are from the Internet, only for learning and communication, and do not have any commercial use. If you have any questions, please contact us in time. The following article comes from Zen of Python data analysis, written by little dull bird preface Today I would like to […]
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On the calculation of the distance between two longitudes and latitudes
Generally speaking, the linear distance between two points we usually see when calculating latitude and longitude is directly linked to the distance between the driving and cycling curves, as the map docking of APP docking map, official account and other small programs, etc., so the two cannot be equated attention. Here are two ways to […]
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Geohash precision and principle
Geohash precision and principle Transferred from:https://www.cnblogs.com/feiquan/p/11380461.html The basic principle of geohash is to understand the earth as a two-dimensional plane, recursively decompose the plane into smaller sub blocks, and each sub block has the same coding in a certain latitude and longitude range. This method is simple and rough, and can meet the latitude and […]
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HTML5 (V) geolocation
HTML5 Geolocation Locate the user The HTML5 geolocation API is used to get the user’s geographic location. Since this feature may infringe the privacy of users, the location information of users is not available unless they agree. be careful:Geolocation is more accurate for devices with GPS, such as the iPhone. geographyGeography; location; geo + location; […]
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4 kinds of LBS “nearby people” implementation scheme, everyone can understand
This article is included in personal blog: http://www.chengxy-nds.top , technical data sharing and learning together Yesterday, a buddies of the official account and I discussed an interview question. Personally, it was more meaningful. I arranged it here to share it with you. The interview question is relatively simple: “let you realize the function of a […]