Transcript Open Source GIS Arhiceture

Open Source GIS Architecture
Testing at EPC
Nomeneta Saili
Pacific GIS/RS Conference, Fiji, 2011
Overview
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Backdrop
Open Source GIS Architecture
Architecture Diagram
Database (PostGIS/PostGres)
Application Server (GeoServer)
Cache (WebCache)
Desktop GIS Client (QGIS)
Web Client (Openlayers/GeoEXT)
Further Open Source Developments/Testing
Backdrop
EPC GIS use is increasing rapidly in application and
number of users. The result is the growth in GIS
data generation/maintenance at EPC with the
following issues/opportunities that needed to be
addressed
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Data management issue (Overall main issue)
Field use of GIS data
License cost for growing number of GIS users
Need to modify attribute data from client end
Open Source GIS Architecture
• Test for solution to issues brought about by
the growth in GIS at EPC
• Centralize spatial database, web server, web
cache, desktop GIS client still in testing phase
• Web client still in development
• Open Data Kit in pre testing phase
Architecture Diagram
EPC Network
Web Client
(Openlayers
+GeoEXT)
Desktop Client
(QGIS 1.7)
Cache
(WebCache)
Application
Server
(GeoServer)
Field Data
Collector
(ODK)
(Pre-testing
Phase)
GPRS
Database
(PostGIS)
Database
PostGIS 1.5 + Postgres 8.4
• Spatial Database (Spatial Index)
• Centralize. One main copy of EPC GIS data to
minimize data fragmentation from the
development of departmental GIS in various
EPC Division due to rapid increase in use of
GIS at EPC
• Support WMS,WFS,WFS-T
PostGIS/Postgress Screen Shot
phpPgAdmin Interface of EPC Power User GIS Postgres Database
Application Server
Geoserver 2.0.2
• Serves/edits maps/data using WMS, WFS,
WFS-T
• Use PowerUserGIS database
(PostGIS/Postgres)
• Many map styling features for stylized web
maps
Geoserver Screen Shots
Geoserver Admin Web Interface
Geoserver Map Example
Layer group interfaced with EPC
Vehicle Tracker to use for Power
Switching Application
Cache
WebCache
• Bundle with Geoserver in version 2.1.2
• Caches both vector and raster data
• Tiling and Pyramids
• Improve request response time
Desktop GIS Client
QGIS 1.7 (wroclaw)
• For Heavy GIS Users that require advance GIS
functionality
• Opens most GIS file format from a service, database or
local GIS Data repository
• Access to both Geoserver and PostGIS
• Enables client editing of attribute and geometric
features
• Versioning system
• Offline packaging and synchronization of GIS data for
field work
Access to GeoServer and PostGIS
PostGIS
Geoserver
QGIS Versioning
Allows for creation of version layers on PostGIS as well as
their management. Show differences, show changes
logs and committing or reverting changes made by
users. Extremely important for management of client
edits of PostGIS database
Offline editing
• Offline/Field use of EPC GIS rapidly increasing
• Current WebGIS (Intergraph Geomedia Web
Map) data is only accessible when client is
connected to EPC LAN.
• Currently use MapInfo for offline with local
copy of GIS database on each client machine.
Huge issue with data management with
different users with different copy/edits of GIS
database.
QGIS Offline Editing
Convert/package project to offline
Once client connected, synchronize with
PostGIS
• Allows users to package Central PostGIS tables
when connected to PostGIS database.
• Allows offline editing of PostGIS tables when not
connected
• Allows synchronization of user edits to the
Central PostGIS database when connected back
to PostGIS database
Web Client
Openlayers + GeoEXT
• For General GIS users that require minimum GIS
functionalities.
• Java script and EXT JS based
• Enables client editing of attribute and geometric
features
• Access to both GeoServer and PostGIS. Currenlty
set to access GeoServer only
• Still in development
Web Client Screen Shot
In Development
Further Open Source
Developments/Testing
• QGIS Web Server – Alternative to GeoServer
Allows publishing of QGIS interface as a web client.
Easier than coding the web interface with Openlayers +
GeoEXT for advance function
• Geoserver Versioning System.
• Open Data Kit (ODK) – Android based field collection
tech
Allows any android device to be used as a data
collection device with digital forms sent via GPRS to
back end postgres database
ODK Continue
• Allows users to define their own data collection
forms which includes GPS Capture provided
android device has GPS capability
• Sends data to backend database for access in
various formats
• Intended as a cost effective field asset reporting
tool to be use by any general EPC field staff to
report on any general field survey not requiring
EPC GIS Trimble field asset capture
equipment/software to reduce increasing load on
EPC GIS unit field survey services
Thank you/Faafetai