A GeoSpatial Mapping Architecture

1
A GeoSpatial Mapping Architecture

• Matthew Blanchette
• Graduate Student Research Assistant
• Computer Science Department
• Research Computer Group ISIS
• University of Southern Maine
• GeoPortal Project
• Maine GeoLibrary Board

2
Overview

• System Goals Layout
• Data Sources
• Open-Source Mapping Servers
• OGC Standards
• Google Visualization
• Visualization Alternative

3
System Goals

• Functionality
• Allow Web Access to Geospatial Data
• Display Geospatial Data in a Map Viewer
• Implementation
• Flexibility Swap system components
• Cost Minimized
• Open Source Free Geospatial Tools
• Geospatial Web Standards

4
System Layout
Example Case ACFISH2 Shapefile Data Point
locations of streams and rivers in Maine with
runs and passages of anadromous and catadromous
fish. Maine Office of Geographic Information
Systems Catalog http//megis.maine.gov/catalog/
5
Data Source - Shapefile

• ESRI Geospatial Data Format
• Collection of files to describe geometries
  (points, polygons, lines) spatially and with
  attributes
• Example case ACFISH2
• acfish2.dbf, acfish2.prj, acfish2.shp,
  acfish2.shx
• Metadata
• acfish2.xml, acfish2.txt., acfish2.htm

6
Data Source - Database

• Spatially Enabled (PostGIS for PostgreSQL, MyGIS
  for MySQL)
• Example case ACFISH2
• Attribute columns ID, NAME, YEAR,
• Geometry column Points

7
Open Source Mapping Servers

• MapServer
• University of Minnesota
• PhD Project, NASA, 1994
• C, CGI, OGR/GDAL
• Mapscript (PHP,Java,Python,etc)
• PostGIS, Oracle Spatial, ArcSDE, MySQL,
  Shapefiles
• OGC Standards

GeoServer The Open Planning Project, Data
Sharing - WFS, 2001 Java, GeoTools PostGIS,
Oracle Spatial, ArcSDE, DB2, MySQL,
Shapefiles OGC Standards
8
OGC Standards

• Open Geospatial Consortium international
  geospatial standards organization
• WMS Web Map Service
• Specification for providing map images
• MapServer and GeoServer
• SLD Styled Layer Descriptor
• XML schema for styling map layers (WMS)
• KML Keyhole Markup Language
• XML schema for geographic visualization and
  annotation
• Keyhole, Inc. and Google
• GeoServer GeoTools can output as KML

9
WMS Example

• ACFISH2 MapServer WMS Image

10
KML Example

• ltPlacemark id"acfish2.176"gt
• ltnamegtacfish2.176lt/namegt
• ltdescriptiongtlt!CDATA
• ltbgtACFISH2_IDlt/bgt 33ltbr /gt
• ltbgtDMR_IDlt/bgt F3ltbr /gt
• ltbgtECCM_IDlt/bgt ltbr /gt
• ltbgtYEARlt/bgt 1982ltbr /gt
• ltbgtECCM_SPlt/bgt ltbr /gt
• ltbgtUSFW_SPlt/bgt ltbr /gt
• ltbgtDMR_SPlt/bgt ADEGHNSltbr /gt
• ltbgtDMR_NAMElt/bgt KENNEBEC RIVERltbr/gt
• gtlt/descriptiongt
• ltMultiGeometrygt
• ltPointgt
• ltcoordinatesgt
• -69.78452182688191,
• 43.77204938317024
• lt/coordinatesgt
• lt/Pointgt

• ACFISH2 KML
• Libraries in many languages to edit and produce
  XML
• GeoTools and XMLBeans (Java)
• Concerns
• Projection Transformation
• Embedding Descriptive Information

11
Google Visualization

• Google Maps free web mapping application
• Browser, Javascript, API
• Maps, Satellite, Terrain, Traffic, Street View
• Google Earth free 3D globe program
• Variety of OS Windows, Mac, Linux
• Google Earth Plugin same 3D globe service
• Browser Firefox or IE 6/7
• Integrates with Google Maps

12
Google Maps WMS Example

• Yankee Foliage
• MapServer
• WMS
• counties layer
• Colored polygons

13
Google Maps KML Example

• ACFISH2 KML

14
Google Earth WMS Example

• Atlas of Canada
• MapServer WMS, Lakes and Reservoirs layer

15
Google Earth NOAA Example

• National Weather Service Doppler Radar
  locations KML

16
Google Earth KML Example

• ACFISH2 KML

17
Google Earth Plugin Example

• Google Maps Integration

18
Visualization Alternative

• OpenLayers
• Open source Javascript library, allows displaying
  dynamic map data in web browsers
• API Google Maps
• The Open Planning Project (same as GeoServer)
• Data Sources
• GeoServer, MapServer, Google, WMS, KML, etc.

19
OpenLayers Example

• ACFISH2 KML

20
OpenLayers, GeoServer, PostGIS

• Richard Franks USM Thesis Project