Showing markers on google map v3 with dynamic zoom level by leveraging sql server to show closest landmarks to the specific latitude and longitude

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Latitude measures how far north or south of the equator a place is located. The equator is situated at 0°, the North Pole at 90° north (or 90°, because a positive latitude implies north), and the South Pole at 90° south (or –90°). Latitude measurements range from 0° to (+/–)90°.

Longitude measures how far east or west of the prime meridian a place is located. The prime meridian runs through Greenwich, England. Longitude measurements range from 0° to (+/–)180°.

Well-known text (WKT) is a text markup language for representing vector geometry objects on a map

POINT(Longitude  Latitude )


Steps

1- Create a table in sql server database to store all of your landmarks latitudes and longitudes. 
2- Create a web API/Service that gets the position (latitude and longitude) and returns back the list of land marks closest to the point – it’s configurable to set number of expected landmark and radius of search)
3- Implement UI 




Good reads:
https://technet.microsoft.com/en-us/library/bb964711(v=sql.120).aspx
http://weblog.west-wind.com/posts/2012/Jun/21/Basic-Spatial-Data-with-SQL-Server-and-Entity-Framework-50
http://www.sql-server-helper.com/sql-server-2008/convert-latitude-longitude-to-geography-point.aspx
http://www.spyriadis.net/2010/07/calculate-distance-between-locations-in-sql-server-2008-using-geography/

Similar scenarios:

http://stackoverflow.com/questions/15719951/google-maps-api-v3-auto-center-map-with-multiple-markers
http://stackoverflow.com/questions/19304574/center-set-zoom-of-map-to-cover-all-markers-visible-markers
http://stackoverflow.com/questions/5405539/google-maps-v3-why-is-latlngbounds-contains-returning-false