# Weather Observation Station 20 Solution

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Also Visit:  Weather Observation Station 19 Solution

#### Problem

Consider P1(a, c) and P2(b, d) to be two points on a 2D plane where (a, b) are the respective minimum and maximum values of Northern Latitude (LAT_N) and (c, d) are the respective minimum and maximum values of Western Longitude (LONG_W) in STATION.

Query the Euclidean Distance between points P1 and P2 and format your answer to display 4 decimal digits.

Input Format

The STATION table is described as follows:

where LAT_N is the northern latitude and LONG_W is the western longitude.

## Solution – 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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