Pushing the envelope…

New and innovative ways to leverage Open Source Toolkits

for the ERMA portal

Aaron Racicot (Z-Pulley Inc)Dane Springmeyer (DBSGeo)

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Architecture

Current Architecture

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Data Layer

Modeling/AnalysisLayer

User InterfaceLayer

USER USERUser Interface

(Custom HTML/JS and Openlayers)

Internet

Web Server (Apache/mod_perl)

???

Database (PostgreSQL/PostGIS) & File Server (Linux - Fedora)

GIS (Mapserver)

Custom Perl Module

SERV

ER

Architecture Direction

• Consolidation of Languages– Migrate to Python where it makes sense

• Integrate frameworks– GeoDjango – Authentication, REST Services, Admin– GeoExt – UI Layout, Cross Platform Support

• Increase ease of deployment– Automate with install scripts– Reduce dependencies

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Possible Future Architecture

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Data Layer

Modeling/AnalysisLayer

User InterfaceLayer

USER USERUser Interface

(GeoExt and Openlayers)

Internet

Web Server (Apache/mod_python)

Integration Framework(Python)

Database (PostgreSQL/PostGIS) & File Server (Linux - Ubuntu)

GIS (Mapserver/Mapnik)

Framework (GeoDjango)

SERV

ER

Current Short List• Shortcuts for speed

– Server/Connection speed– Faster map requests via Caching (TileCache)– Database optimization (indexing, normalization)– Avoid on-the-fly reprojection – Harmonize into common projection

• Frameworks and Libraries for:– Security

• Wrapping WMS/WFS services in authentication framework– Cross Platform Support

• Get IE support enabled– UI Layout optimization

• Increase map size• Online help

• Increased print functionality

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Current Long List

• Batch uploads• Search and Query capability• Enhanced Reporting• Incorporate 3rd party datasets (IOOS etc), both

WMS/WFS/WCS• Custom groups for categorizing users, AOI’s, visible

datasets, etc.• Bookmarks for quickly allowing users to scale to a

project scope in the interface

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Speed

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Tile Serving with TileCacheUser Interface

(OpenLayers)

Internet

Web Server (Apache)

Database (PostgreSQL/PostGIS)

GIS (Mapserver/Mapnik)

TileCache

http://labs.metacarta.com/wms-c/tilecache.py/1.0.0/basic/5/32/23.png

Cache Miss

Disk Cache

User Interface (OpenLayers)

Internet

Web Server (Apache)

Database (PostgreSQL/PostGIS)

GIS (Mapserver/Mapnik)

TileCache

http://labs.metacarta.com/wms-c/tilecache.py/1.0.0/basic/5/32/23.png

Cache Hit

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ProjectionsUser Interface

(OpenLayers)

Internet

Web Server (Apache)

Database (PostgreSQL/PostGIS)

GIS (Mapserver/Mapnik)

http://labs.metacarta.com/wms-c/tilecache.py/1.0.0/basic/5/32/23.png

Proj4

Proj Mismatch

User Interface (OpenLayers)

Internet

Web Server (Apache)

Database (PostgreSQL/PostGIS)

GIS (Mapserver/Mapnik)

http://labs.metacarta.com/wms-c/tilecache.py/1.0.0/basic/5/32/23.png

Proj4

Proj Match

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Frameworks

ExtJS GeoExt

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Django GeoDjango

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Rendering

Mapserver Mapnik

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