Web Mapping Service Development For DMSP Satellite Data Chris Elvidge, NOAA National Geophysical Data Center Ben Tuttle, Cooperative Institute for Research in Environmental Sciences, University of Colorado 24th APAN Meeting (Xi'An, China)

Open Geospatial Consortium, INC. (OGC) A non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services. A non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services.

Web Mapping Service (WMS) Produce maps of spatially referenced data dynamically from geographic information Produce maps of spatially referenced data dynamically from geographic information A map is not the data itself A map is not the data itself Generally rendered in a pictorial format such as PNG, GIF or JPEG Generally rendered in a pictorial format such as PNG, GIF or JPEG

Web Coverage Service (WCS) A standard web service for exchanging geospatial data A standard web service for exchanging geospatial data Returns the actual data (not a picture as with WMS) Returns the actual data (not a picture as with WMS) Returns georeferenced data in formats such as GeoTiff Returns georeferenced data in formats such as GeoTiff

Goals A scalable method for data visualization and distribution A scalable method for data visualization and distribution Easy access to data via multiple methods Easy access to data via multiple methods Access Control Access Control Ability for clients to select an ROI Ability for clients to select an ROI

Why OGC Web Service Standards?

View via Virtual Globe

View via Web Browser

View via Map Viewer

View/Download via Custom Clients

Connect via Commercial and Open Source Software Packages ENVI/IDL support WMS and WCS ENVI/IDL support WMS and WCS ArcGIS supports WMS (ESRI plans future support for WCS) ArcGIS supports WMS (ESRI plans future support for WCS) Geographic Data Abstraction Library (GDAL) supports WCS Geographic Data Abstraction Library (GDAL) supports WCS

Architecture Products generated with IDL and Ruby Products generated with IDL and Ruby Web Services Provided with Minnesota MapServer (Open Source) and Ruby (Open Source) Web Services Provided with Minnesota MapServer (Open Source) and Ruby (Open Source) Username and password authentication Username and password authentication

Products Global Composites Global Composites

Daily Mosaics

Lunar Cycle Composites Average Lights, Average Vis, Cloud Free Coverage, Coverage, Percent Lights, Std. Dev. Vis Average Lights, Average Vis, Cloud Free Coverage, Coverage, Percent Lights, Std. Dev. Vis

Gas Flaring Red 2006 Red 2006 Green 2000 Green 2000 Blue 1992 Blue 1992

Surfing DMSP Gas Flares Through Google Earth!

Pinning Down the Locations of Flares!

Finding Balls of Fire in the Digital Globe Base Imagery!

Questions