Web Mining

Shah Mohammad Nur Alam Sawn

03/03/2014

What is Web Mining?

Discovering desired and useful information from the World Wide Web

Exploiting Geographical Location Information of Web Pages

Orkut Buyukkokten(orkut@cs.stanford.edu) Junghoo Cho(cho@cs.stanford.edu) Hector Garcia-Molina(hector@cs.stanford.edu) Luis Gravano(gravano@cs.columbia.edu)

Department of Computer science ,Stanford University, Stanford, Ca 94305.

Department of Computer science, Columbia University, New York, 10027.

(December 27,2008)

“Proof of Concept” using mapping databases

Ways of exploiting information from internet:

Improve the search engine; such as, not showing irrelevant information about the query.

To identify the “globality” of resources; such as, use of hyperlink and exploiting information about web sites then it can estimated how global a web entity is.

Problems of exploit geographical location information of entities

How to compute geographical information? How to exploit this information?

Computing geographical information

Information Extraction; such as, automatically analyze web pages to extract geographic entities like area or zip code.

Network IP Address Analysis; such as, focus on the location of their hosting web sites.

Exploiting the Information using databases

Site Mapper (http://www.internic.net/)

It has the phone numbers of network administrators of all Class A and B domains. From this database, extracted the area code of the domain administrator and built a Site-Mapper table with area code information for IP addresses belonging to Class A and Class B addresses.

Area Mapper (http://www.zipinfo.com/)

It maps cities and townships to a given area code. In some cases, entire states (e.g., Montana) correspond to one area code. In other cases, a big city often has multiple area codes (e.g., Los Angeles). Then write scripts to convert the above data into a table with entries that maintained for each area code the corresponding set of cities/counties.

• Zip-Code Mapper (http://www.zipinfo.com/)

This mapped each zip code to a range of longitudes and latitudes.

States

Cities

RefreshZoom

Map

URL

City

Zip code

Area Code

Ip

Graphical Interface of Proof of Concept Prototype

Output of search

Input

Geospatial Data Mining on the Web: Discovering Locations of Emergency Service Facilities. (2012)

Wenwen Li, Michael F. Goodchild, Richard L. Church , and Bin Zhou GeoDa Center for Geospatial Analysis and Computation, School of

Geographical Sciences and Urban Planning, Arizona State University, Tempe AZ 85287 (Wenwen@asu.edu)

Department of Geography, University of California, Santa Barbara Santa Barbara, CA 93106 {good,church}@geog.ucsb.edu

Institute of Oceanographic Instrumentation, Shandong Academy of Sciences Qingdao, Shandong, China 266001 (senosy@gmail.com )

Google search image of fire station

Actual Location

Google result

Process of Web Crowler A Web crawler is an Internet bot that systematically

browses the World Wide Web, typically for the purpose of Web indexing. A Web crawler may also be called a Web spider, or an automatic indexer.

Defining New Class Address Structure

Form of street address for Identifying target webpages

d1:Distance between p and the location of the foremost digit in the number block closest (before) to location p.

d2: Distance between p and the location of the last digit of the first number that appears(for detecting 5-digit ZIP code), or the last digit of the second number after p if the token distance of the first and second number block equals

r1: regular expression [1-9][0-9]*[\\s\\r\\n\\t]*([a-zA-Z0-9\\.]+[\\s\\r\\n\\t])+

r2: : regular expression "city-Pattern "[\\s\\r\\n\\t,]?+

("statePattern")?+[\\s\\r\\n\\t,]*\\d{5}(-\\d{4})*

Cont.

Decision rules of desired addresses by training data based on semantic information

Station + Num

Key word Station andTitle web page as fire

Station on web page title

Architecture of Proposed Cyber Miner

Here input is seeding web urls and output is target address

Search Results of Cyber Miner

Location of all fire station obtained by Cyber Miner from address database

Web-based geographic search engine for location aware search in Singapore

• Flora S. TsaiSchool of Electrical & Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore 2010.

Geo search

This is able to search for location-specific information in Singapore based Web sites. The user is able to view their search locations on a satellite map instead of the two-dimensional maps currently used in street directories. The Web-based search engine is able to search for locations based on area names, building names, and groups of landmark types, business names, and business categories. Furthermore, the user is also able to use their current coordinates as a parameter so that the search engine is able to return results in order of the distance from the user’s current location.

Google earth

Using google earth for their search

Keyhole Markup Language

Keyhole Markup Language (KML) is a file format used to display geographic data in an earth browser such as Google Earth, Google Maps and Google Maps for mobile.

Street directory

http://www.streetdirectory.com/Usefull for mobile phone only and it is also web map service which merge with google earth

Global Positioning System

Google Earth allows download of tracks and waypoints from GPS devices creates KML files for the waypoints and tracks downloaded.

Design

Design Cont.

• BusinessAreaAddress, where the address is stored without the postal code;

• BusinessAreaPostal, where the postal code is stored;• Area, where the keywords of the area are stored, e.g.

Causeway Point;• General Area, where the General Area of the location

is stored, e.g. Yishun.

Algorithms

Here use the Haversine’s Formula for faster processing.• For two points on a sphere of radius R with latitudes

Ø1 and Ø2, latitude separation Δ Ø= Ø1 - Ø2 and longitude separation Δ λ.

• where angles are in radians, and the distance d between the two points is related to their locations by the formula: h=haversin(Δ Ø)+cos(Ø1 )cos(Ø2 )haversin(Δ λ)……(1)

Algorithms Cont.• Let h denote haversin (d/R) given from above. d can then be

solved either by simply applying the inverse haversine (if available) or by using the arcsine (inverse sine) function:

• d=(R)haversin-1 (h)=(2R)arcsin(√h)………………..(2)• This formula is only an approximation when applied to

Earth as earth is not a perfect sphere, its radius R varies from 6356.78 km at the poles to 6367.45 km at the equator. The error is therefore 0.1% depending on the location due to this slight elipticity. Assuming that the geometric mean of R = 6367.45 km is used.

• The output of this formula is calculating distance from two coordinates

Result

The database from which these results are taken contain 1652 entries with the following categories: • Apparel, Bank, Cinema, Department Store, Duty Free Shop,

Electronics, F&B (food and bev- erage), Fast Food, Food Court, Furniture, Health and Beauty, Minim-art, Musical Instruments, Restaurant, Snack Bar, Sports, Stationery,Seafood, and Supermarket.

• The landmark type searched for are Building, Road, MRT stations, Schools and Shopping Centres. General Area searched under Advanced have various roads grouped into one big area, e.g. Tan-jong Katong and Haig Road are both grouped under the Katong area

Simple search

Input

Output

Advance search

Thank you for your patience!