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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
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Overview System Goals & Layout Data Sources
Open-Source Mapping Servers OGC Standards Google Visualization Visualization Alternative
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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
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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
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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
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Data Source - Database Spatially Enabled (PostGIS for PostgreSQL, MyGIS for MySQL) Example case: ACFISH2 Attribute columns – ID, NAME, YEAR,… Geometry column – Points
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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
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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
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WMS Example ACFISH2 MapServer WMS Image
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KML Example ACFISH2 KML Libraries in many languages to edit and produce XML GeoTools and XMLBeans (Java) Concerns: Projection Transformation Embedding Descriptive Information <Placemark id="acfish2.176"> <name>acfish2.176</name> <description><![CDATA[ <b>ACFISH2_ID</b>: 33<br /> <b>DMR_ID</b>: F3<br /> <b>ECCM_ID</b>: <br /> <b>YEAR</b>: 1982<br /> <b>ECCM_SP</b>: <br /> <b>USFW_SP</b>: <br /> <b>DMR_SP</b>: ADEGHNS<br /> <b>DMR_NAME</b>: KENNEBEC RIVER<br/> ]]></description> <MultiGeometry> <Point> <coordinates> , </coordinates> </Point> </MultiGeometry> </Placemark>
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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
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Google Maps WMS Example
Yankee Foliage MapServer WMS counties layer Colored polygons
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Google Maps KML Example
ACFISH2 KML
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Google Earth WMS Example
Atlas of Canada MapServer – WMS, Lakes and Reservoirs layer
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Google Earth – NOAA Example
National Weather Service – Doppler Radar locations KML
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Google Earth KML Example
ACFISH2 KML
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Google Earth Plugin Example
Google Maps Integration
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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.
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OpenLayers Example ACFISH2 KML
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OpenLayers, GeoServer, & PostGIS
Richard Franks USM Thesis Project
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