using google maps sunday 9th sept. 2012 h.a. nandalal, ttls [email protected]
TRANSCRIPT
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Using Google Maps
What is “Google Maps”?
Google Maps is a publicly availableGeographic Information System (GIS)Base Map from Google Inc.
It is accessed on the internet usingweb browsers:
Chrome v21Firefox v14Internet Explorer v9
http://maps.google.com
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Using Google Maps
The GoogleMaps
Interface:
Zoom Control
Pan Control
Map TypeMenu
Scale Bar
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Using Google Maps
What’s Shown on
The Map?
“Map” Mode:
RoadsBuildings
RiversPts. of Interest
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Using Google Maps
What’s Shown on
The Map?
“Satellite” Mode:
RoadsBuildings
RiversPts. of Interest
onAerial
Photography
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Using Google Maps“Satellite” Mode: Max. Zoom = 1m Resolution
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Using Google Maps
How Can We Use“Google Maps”?
1. Get Information
2. Put Information
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Using Google Maps
GettingInformation
from theBasic Map
WGS84Geodetic
Co-ordinatesin
Decimal Degrees
http://maps.cga.harvard.edu/gpf
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Using Google Maps
What’s theMethodologyfor Getting
Information fromGoogle Maps?
By usingJavaScript
& the GoogleMaps API:
Application Programming
Interface
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Using Google Maps
What isJavaScript?
A ScriptingLanguage
which allowsUsers toInteract
withthe Elements
of aWeb Page
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Using Google Maps
Let’s take aLook at the
Source Codeof the ISTTHome Page
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Using Google Maps
The Web Pageis written inHyperText
Markup Language(HTML).
The JavaScriptCode is in a
Separate File with Extension “js” and
is Linkedto the Web Page
with a“<SCRIPT>” TAG
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Using Google Maps
The JavaScriptCode:
Functions &“ if ” Statements
which can’tbe found in
HTML
JavaScriptAllows for
Computations&
Decision-Making
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Using Google Maps
Let’s Create a Google MapsWeb Page from Scratch:
1. Some HTML Code
2. Some JavaScript Code
3. Load files into a Web Browser
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Using Google Maps
13 Lines ofHTMLCode
Line 7 Linksthe
JavaScript File
Line 11 is a“DIV” or
Rectangleto PlaceThe Map
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Using Google Maps17 Lines of
JavaScript Code
Line 4 Linksthe “DIV”Rectangle fromThe Web Page
Line 6 Defines the Map Centre
Line 12 Defines the Map Type
Line 15 Draws the Map
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Using Google Maps
The Resultfrom
30 Linesof Code
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Using Google Maps
Let’s Change
TheMap Centre
TheZoom Level
&
TheMap Type
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Using Google Maps
The UpdatedMap:
27-28Crichlow St.
San Fernando
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Using Google Maps
TheCo-ordinates
onGoogle Earth
&Google Maps
WGS84Geodetic
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Using Google Maps
ComparingUTM
Co-ordinateson
Naparima&
WGS84Datums
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Using Google Maps
To Convert
FromNaparima UTM
ToWGS84 UTM
+ 170 E+ 184 N
To Convert
FromWGS84 UTM
ToNaparima UTM
- 170 E- 184 N
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Using Google MapsTransforming Geodetic Co-ordinatesBetween WGS84 & Int. 1924 Datums
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Using Google Mapswww.survtools.com/tools/molodensky/molodensky.htm
Online Calculators forPerforming Geodetic Transformations
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Using Google Maps
Putting Informationon Google Maps
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Using Google MapsPutting Information on Google Maps:
Polygons for Wards, Boroughs, Cities & Parishes
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Using Google MapsUsing the Polygons for Wards, Boroughs, Cities & Parishes:
Getting Cadastral Information from a Co-ordinated Point
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Using Google Maps
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Using Google MapsA Basic GIS Application: Performing a Radial Search
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Using Google MapsAnother GIS Application:
Plotting “Un-Indexed” Cadastral Plans
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Using Google Maps
Performing a Radial Search for Cadastral Plans
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Using Google MapsAdding Images to a Google Maps Web Page
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Using Google MapsThe Cadastral Plans Demonstration Web Site:
http://www.survplan.com/boxfile/boxfile.htm
Cadastral Plans Contributed by:
Mr. Winston DoyleMr. Barry HernandezMr. Trevor Koylass
Mr. Winston MohammedMr. Harvey Ramrekha
Mr. Kamal SantMr. Nicolas Westmass
Mr. Glenn WilkesMr. Burton WilliamsMr. Paul Williams
THANK YOU!