[postgis-users] PostGIS Usage Survey
Carl Anderson
candrsn at mindspring.com
Mon Feb 3 20:26:13 PST 2003
I wear two hats
Georgia Speleological Survey
part of Web app to record and render points of interest
used for trigger based projection of data.
used for map generation
Web app is PHP/Mapserver based
Mapping tools are GRASS based
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Fulton County, Georgia USA
web based entering and editing of,
web based vizualization of complex table joins of,
management and generation of time thematic data versions of,
proximity analysis using,
extraction of complex SQL queries of (as shapefiles),
extraction of production maps of,
Cadastral data (280,000 Parcels)
Zoning data
LandUse (Future) plans
Annexation cases
Sanitary Sewer AM/FM
Centerline (new roads as part of permitting processing)
Addresses (new addresses as part of permitting process)
Building Permits
US 2000 Census SF1 files (visual reporting only)
US 2000 Census SF3 files (visual reporting only)
Specimen tree inventory
GPS monumentation inventory
Sewer Flow Monitoring (mostly RDBMS info)
Automated Address Geocoding
Management of data for use in GRASS
(mostly 'cause GRASS is horrible at large dataset management)
DTM (36 million data points)
Elevation Countour (88 million vertices)
Spot Elevations (50 thousand points)
used Post GIS to assemble and reselect data based on proximity and
validity while generating a DEM from the three data sources.
I know that this scale of data can easily be exceeded. my point in
showing the scale is that PostGIS can manage datasets at least this
large (with little difficulty).
PostGIS data is used with
Arc/Info (custom scripts)
Arcview Unix & PC (custom scripts)
Mapguide (currently write only, OLE Db limitation)
GRASS-5
Mapserver
Perl (custom scripts to extract/import shapefiles)
PHP (pass through for object insertion/editing)
The advantages of PostGIS on PostgreSQL: (IMHO)
easy to create trigger based data consistency rules
shared, concurrent data editing
web based concurrent data editing
easy to replicate data to query-only servers
relatively lightweight RDBMS server footprint leveraging other
Open Source projects results in quickly expanding features
we can share project burdens with others without licensing issues
we can establis development machine w/O having to justify the cost
A bit of a history:
In 1998 and 1999 I hacked Shapelib to add limited geospatial support
into BLOBS for Oracle (super ugly code never made public). For
various reasons I
was running PostgreSQL at the same time. When PostGIS came to my
attention
I moved the hacks over to PostGIS and modified the custom scripts to
support
postgres.
I will package up some of the better custom scripts (finally).
--
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Carl Anderson
candrsn at mindspring.com
New Hampshire tells us "common sense for all"
where can I get mine?
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