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Functional Demonstration of the National Urban Database and
Access Portal Tools (NUDAPT)
Torrin Hultgren Computer Sciences Corporation
Jason ChingARL/NOAA –NERL/USEPA
Research Triangle Park, NC
David WilliamsNERL/USEPA
Research Triangle Park, NC
Overview and Rationale• Urban air quality models are increasing in complexity
Number and type of input parameters Methods required to derive inputs
• Desktop GIS good for these types of data, but most modelers don’t need a full GIS – just a few key tools
• A new, web-based system has been developed that delivers desired tools (clip, project, resample, reformat) on-demand
• Source data is stored with daughter Urban Canopy Parameters (UCPs) in a centralized repository for easy comparison and download
• Parallel website facilitates discussion, collaboration and partnerships
Two Portals, One Whole
• Quickplace Powerful, flexible collaboration suite Built-in security controls, file sharing ability Leverages existing EPA Lotus Domino technology
• Data Download Portal Delivers server-side data processing, minimizing or
eliminating the need for desktop GIS Responsive map viewer for data exploration Relies on ESRI’s ArcGIS Server technology
Quickplace Summary
• Collaboration tool – what the group gets out depends on what the group puts in
• Easy to share documents, smaller datasets (less than 20MB), presentations
• Available calendar/task management tools
• Help build consensus on UCP methods and strategies
Data Download Portal
• Commercial Off-The-Shelf (COTS) Technology ESRI’s ArcGIS Server
• Map viewer AJAX for smooth dragging and zooming Built-in identify, measure, and magnify tools Dynamic table of contents
• Data repository Quickly import data, add to map, publish to web Tightly integrated with windows security GIS tools allow fast, easy data pre-processing if
necessary
Data Download Tool
• Server-based geoprocessing
• Geographic Information System (GIS) functionality without need for desktop GIS
• Simple, readable Python script links out-of-the-box tools into one seamless process
• Clip – Reproject/Resample – Reformat – Zip
• Extensible Could connect to other web services
Could be used to derive UCPs
Input Raster or Shopping BasketInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• Dropdown box• Corresponds to layer
names listed in the table of contents
• Baskets match groups in table of contents
Input Process
Clip ExtentInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• Draw extent
directly on the
map or specify
using coordinates• Tool uses bounding box
envelope• Envelope projected into spatial
reference of raster and output
Input Process
Output Coordinate Reference SystemInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• Initially contains only four systems, all NAD83 Geographic Latitude/Longitude UTM Zone 15N USGS Albers Equal Area South Central Texas State Plane
(Feet)
• ESRI Library contains hundreds, custom projections are also possible
• Also have option of leaving all rasters in source projection
Input Process
Resampling MethodInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• Nearest Neighbor
• Bilinear Interpolation
• Cubic Convolution
Input Process
Output Cell SizeInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• All rasters will be resampled to user-specified output cell size
• If no cell size specified, all rasters will remain at source resolution
• Regardless of input, no output will have smaller cell size than the minimum output resolution cutoff (15m)
• Minimum resolution determined by security restrictions
Input Process
Output File FormatInput
Raster(s)
Input Raster(s)
InputExtent
OutputCoordinate
System
ResamplingMethod
Output Cell Size
OutputFile Format
Clip Raster
ProjectRaster
ConvertRasterFormat
Zip
• Available formats are: NetCDF ASCII Floating Point Imagine Image GeoTiff
• All output files (rasters, header files, metadata) are zipped for download
• Binary results “key” allows you to pick up output later
Input Process
Issues and Path Forward
• Metadata Issue: for researchers, accurate information on data (metadata) is essential No metadata reporting standard exists Project stakeholders and collaborators
must take this task on
• Data portal enhancements issue: major development work is complete minor portal enhancements can be done
Issues and Path Forward
• Hosting Issue: data portal currently is on internal EPA network, not open to public Soon the portal will be hosted by UNC CEP
for open, controlled access Continuation of the data portal will require
investment by the community• EPA funded prototype system development
under GEOSS grant. System web hosting maintenance not supported by the grant
Path Forward
• The NUDAPT data portal prototype has demonstrated the feasibility and utility of providing data for researchers The future of the portal relies on community
participation and investment Development work is complete. System
needs a host and the minimal funding for operation
Summary
• Urban air quality modelers frequently work in parallel but have difficulty sharing daughter products
• NUDAPT Quickplace facilitates collaboration and discussion
• NUDAPT Data Portal allows exploration, extraction, transformation, and download of source and derived datasets
Disclaimer: The research presented here was performed under the Memorandum of Understanding between the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Commerce's National Oceanic and Atmospheric Administration (NOAA) and under agreement number DW13921548. This work constitutes a contribution to the NOAA Air Quality Program. Although it has been reviewed by EPA and NOAA and approved for publication, it does not necessarily reflect their policies or views.
Thanks to all NUDAPT collaborators for contributions and feedback!