# Weather Observation Station 20 Solution

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Also Visit:ย  Weather Observation Station 19 Solution

#### Problem

Considerย P1(a, c)ย andย P2(b, d)ย to be two points on a 2D plane whereย (a, b)ย are the respective minimum and maximum values ofย Northern Latitudeย (LAT_N) andย (c, d)ย are the respective minimum and maximum values ofย Western Longitudeย (LONG_W) inย STATION.

Query theย Euclidean Distanceย between pointsย P1ย andย P2ย andย format your answerย to displayย 4ย decimal digits.

Input Format

Theย STATIONย table is described as follows:

whereย LAT_Nย is the northern latitude andย LONG_Wย is the western longitude.

## Solution โ Weather Observation Station 19

##### MySQL Code
SET @r = 0;

SELECT ROUND(AVG(Lat_N), 4)

FROM (SELECT (@r := @r + 1) AS r, Lat_N FROM Station ORDER BY Lat_N) Temp WHERE

r = (SELECT CEIL(COUNT(*) / 2) FROM Station) OR

r = (SELECT FLOOR((COUNT(*) / 2) + 1) FROM Station)

#### Weather observations

Basic weather observation instruments include thermometers, rain gauges, barometers, and anemometers (wind speed meters).

#### What are the four types of weather observations?

There are four types of weather observations: surface, upper air, radar, and satellite.

#### What is weather observation stations?

A weather station is a facility, either on land or sea, with instruments and equipment for measuring atmospheric conditions to provide information for weather forecasts and to study the weather and climate.

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