1. Using Google Maps Sunday 9th Sept. 2012 H.A. Nandalal, TTLS nanco@tstt.net.tt www.survplan.com www.survtools.com

2. Using Google Maps What is “Google Maps”? Google Maps is a publicly available Geographic Information System (GIS) Base Map from Google Inc. It is accessed on the internet using web browsers: Chrome v21 Firefox v14 Internet Explorer v9 http://maps.google.com

3. Using Google Maps The Google Maps Interface: Zoom Control Pan Control Map Type Menu Scale Bar

4. Using Google Maps What’s Shown on The Map? “Map” Mode: Roads Buildings Rivers Pts. of Interest

5. Using Google Maps What’s Shown on The Map? “Satellite” Mode: Roads Buildings Rivers Pts. of Interest on Aerial Photography

6. Using Google Maps “Satellite” Mode: Max. Zoom = 1m Resolution

7. Using Google Maps How Can We Use “Google Maps”? 1. Get Information 2. Put Information

8. Using Google Maps Getting Information from the Basic Map WGS84 Geodetic Co-ordinates in Decimal Degrees http://maps.cga.harvard.edu/gpf

9. Using Google Maps What’s the Methodology for Getting Information from Google Maps? By using JavaScript & the Google Maps API: Application Programming Interface

10. Using Google Maps What is JavaScript? A Scripting Language which allows Users to Interact with the Elements of a Web Page

11. Using Google Maps Let’s take a Look at the Source Code of the ISTT Home Page

12. Using Google Maps The Web Page is written in HyperText Markup Language (HTML). The JavaScript Code is in a Separate File with Extension “js” and is Linked to the Web Page with a “ ” TAG

13. Using Google Maps The JavaScript Code: Functions & “ if ” Statements which can’t be found in HTML JavaScript Allows for Computations & Decision-Making

14. Using Google Maps Let’s Create a Google Maps Web Page from Scratch: 1. Some HTML Code 2. Some JavaScript Code 3. Load files into a Web Browser

15. Using Google Maps 13 Lines of HTML Code Line 7 Links the JavaScript File Line 11 is a “DIV” or Rectangle to Place The Map

16. Using Google Maps 17 Lines of JavaScript Code Line 4 Links the “DIV” Rectangle from The Web Page Line 6 Defines the Map Centre Line 12 Defines the Map Type Line 15 Draws the Map

17. Using Google Maps The Result from 30 Lines of Code

18. Using Google Maps Let’s Change The Map Centre The Zoom Level & The Map Type

19. Using Google Maps The Updated Map: 27-28 Crichlow St. San Fernando

20. Using Google Maps The Co-ordinates on Google Earth & Google Maps WGS84 Geodetic

21. Using Google Maps Comparing UTM Co-ordinates on Naparima & WGS84 Datums

22. Using Google Maps To Convert From Naparima UTM To WGS84 UTM + 170 E + 184 N To Convert From WGS84 UTM To Naparima UTM - 170 E - 184 N

23. Using Google Maps Transforming Geodetic Co-ordinates Between WGS84 & Int. 1924 Datums

24. Using Google Maps www.survtools.com/tools/molodensky/molodensky.htm Online Calculators for Performing Geodetic Transformations

25. Using Google Maps Putting Information on Google Maps

26. Using Google Maps Putting Information on Google Maps: Polygons for Wards, Boroughs, Cities & Parishes

27. Using Google Maps Using the Polygons for Wards, Boroughs, Cities & Parishes: Getting Cadastral Information from a Co-ordinated Point

28. Using Google Maps

29. A Basic GIS Application: Performing a Radial Search

30. Using Google Maps Another GIS Application: Plotting “Un-Indexed” Cadastral Plans

31. Using Google Maps Performing a Radial Search for Cadastral Plans

32. Using Google Maps Adding Images to a Google Maps Web Page

33. Using Google Maps The Cadastral Plans Demonstration Web Site: http://www.survplan.com/boxfile/boxfile.htm Cadastral Plans Contributed by: Mr. Winston Doyle Mr. Barry Hernandez Mr. Trevor Koylass Mr. Winston Mohammed Mr. Harvey Ramrekha Mr. Kamal Sant Mr. Nicolas Westmass Mr. Glenn Wilkes Mr. Burton Williams Mr. Paul Williams THANK YOU!