Tag：Latitude and longitude
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Time：2021-5-4
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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Time：2021-4-6
#As I wrote before, the original author of this article is Charles. I just process it on the basis of his program. In addition, I have some modifications of my own, with notes and my own understanding attached. This is also a learning process for me. #Attach the GitHub address of the boss: https://github.com/CharlesPikachu/Tools ”’Function: […]
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Time：2021-3-15
var location = []; function getAddrGeo(addr) { //Get the latitude and longitude of an address, which can be used for mobile terminal to jump app navigation $.ajax({ type: “GET”, url: ” http://restapi.amap.com/v3/geocode/geo?key= Your key & S = rsv3 & address = “+ addr.trim(), success: function (response) { location = response.geocodes[0] && response.geocodes[0].location.split(“,”); }, error: function […]
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Time：2021-2-27
Automatic drawing of electronic fence by using JS API of Gaode mapBecause it is not accurate to draw polygon directly, we need to draw fence along the road E-fence idea: 1. Find the origin latitude and longitude X const CENTER = [116.397504,39.89619] Const distance = 300 // unit M const map = new AMap.Map(“container”, { […]
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Time：2021-2-18
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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Time：2021-1-15
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 is from Python practical dictionary, written by ckend Introduction to Python data analysis https://www.bilibili.com/video/BV18f4y1i7q9/ Python is so […]
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Time：2020-5-14
Redis slow query 1. Used to view redis slow logs. Redis pipeline 1. For batch operation Publish and subscribe 1. Role: publisher, subscriber and channel.2. Model: similar to producers and consumers.3.API publish: publish channel message subscribe: subscribe channel unsubscribe: unsubscribe channel Psubscribe: mode subscription. Punsubscribe: unsubscribe from the specified mode. PubSub channels: lists channels with […]
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Time：2020-5-7
Why write this blog Geographic Information System layman, computer background. The project requires development based on CSharp and SuperMap. After looking at the example program of SuperMap, I found that there is no one I can use. Some examples have reference value, but they are also edges and corners, not a system. You need to […]
