28 Feb 2008UNI GeoTREE Visit Iowa Environmental Mesonet: Using Open Source GIS Tools and Web Services to Disseminate Environmental Data Daryl Herzmann.

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Presentation transcript:

28 Feb 2008UNI GeoTREE Visit Iowa Environmental Mesonet: Using Open Source GIS Tools and Web Services to Disseminate Environmental Data Daryl Herzmann Iowa State University

28 Feb 2008UNI GeoTREE Visit Data, data, everywhere data

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit The Desperate Challenge Disparate Formats –Grib –METAR –Text CSV –Free form text –ADAS III –SHEF –Excel (gasp!) Disparate Network Protocols –HTTP –FTP –LDM IDD (tcp) –TCP stream –Modems The data comprising the IEM is made available to us in the following formats and network protocols.

28 Feb 2008UNI GeoTREE Visit Why an Open Source solution? 1.They are the best tools out there. UNIX mentality -> Do something small and do it well. 2.Transparency. We are a public institution doing public funded research. 3.Excellent Support Public bug trackers Community forums IRC Motivated developers

28 Feb 2008UNI GeoTREE Visit Open Source Solution PostGIS / PostgreSQL Spatial Database Map Server Mapping Engine + Scripting Red Hat Linux Operating System Python Data processing and network services GDAL Swiss Army Knife of all things GIS PHP Dynamic Website

28 Feb 2008UNI GeoTREE Visit Key Component: PostGIS Early IEM code (2001) was a series of flat files in Shapefile format and database of observations. This was a disaster. PostGIS provided the opportunity to manage data, metadata, and the GIS data in one location. –Network scalability –Transaction / stored procedure support –Speed / functionality with merge of GEOS library

28 Feb 2008UNI GeoTREE Visit Look at all of my data!

28 Feb 2008UNI GeoTREE Visit Here’s an idea, lets create a webpage where they can download the data!

28 Feb 2008UNI GeoTREE Visit The Open Geospatial Consortium (OGC) Way

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit Supporting the Load

28 Feb 2008UNI GeoTREE Visit Available OGC Services

28 Feb 2008UNI GeoTREE Visit CONUS GOES (Infrared, Visible) CONUS NEXRAD Base Reflectivity, Storm Total Precip, 1 Hour Precip NWS issued advisories,watches, and warnings Iowa Rainfall Estimates Iowa Road Conditions IEM Data Services (temp, winds, etc)

28 Feb 2008UNI GeoTREE Visit Raw NEXRAD Composites Have a large amount of noise due to ground clutter. A simple GDAL script comparing radar echos to its elevation quickly gets rid of most noise.

28 Feb 2008UNI GeoTREE Visit Cleaned Composite

28 Feb 2008UNI GeoTREE Visit Some IEM developed GIS webapps

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit 4 May 2003, heavy rains on freshly tilled soils 25 Sep 2005, heavy rains on mature crops

28 Feb 2008UNI GeoTREE Visit What others have done.

28 Feb 2008UNI GeoTREE Visit

28 Feb 2008UNI GeoTREE Visit Future Work Work with end users on getting IEM data into their platform.

28 Feb 2008UNI GeoTREE Visit Time for Questions? Daryl Herzmann