Transcript R&D Project I – Persistent WCS and CSW services for GOES Data

Access HDF-EOS data with OGC Web
Coverage Service - Earth Observation
Application Profile
HDF and HDF-EOS Workshop XV
Yuanzheng Shao
Center for Spatial Information Science and Systems
George Mason University
04-18-2012
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Contents
1.
2.
3.
4.
WCS 2.0
Implementation
Useful links
Future work
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Web Coverage Service 2.0
• What’s WCS?
– “A WCS provides access to potentially detailed and rich sets
of geospatial information, in forms that are useful for clientside rendering, multi-valued coverages, and input into
scientific models and other clients” - [OGC 07-067r5].
• WCS 2.0
– Adopts modular design method.
– Harmonizes with EO Metadata Profile of O&M (OGC 10-157), GML coverage
model (OGC 07-036, GML3.2.1) and SWE Common (OGC 08-094) in range
description.
– Uses core plus extensions pattern: the core defines a “core” set of
requirements and extension specifications add further functionality.
– The core specification is not completely implement-able without certain
extensions, e.g., format extension.
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Web Coverage Service 2.0
EO vocabulary
scene / image / product / raster
data (image) / raw data (image) /
orthoimage
WCS EO AP
dataset
lat
lat
long
long
i
i
j
rectified grid coverage
j
referenceable grid coverage
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Web Coverage Service 2.0
EO vocabulary
WCS EO AP
google-like mosaic / composite
mosaic
Stitched Mosaic
lat
t
dataset series
DescribeEOCoverageSet
(mosic ID) provides a set
of descriptions of the
Dataset used in the
Stitched Mosaic
long
2-D stitched mosaic
DescribeCoverage
(mosic ID) provides a
descriptions of the
mosaic
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Web Coverage Service 2.0
EO vocabulary
WCS EO AP
collection
dataset series
E
A ….. dataset (e.g. scene)
B ….. dataset (e.g. seamless mosaic)
C ….. datasets of dataset series
(e.g. time series)
D ….. datasets of dataset series
E ….. dataset series (e.g. collection)
A
B
C
t
D
lat
long
A dataset may be a
member in different
Dataset Series
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Web Coverage Service 2.0
• GetCapabilities, DescribeCoverage, GetCoverage
• DescribeEOCoverageSet
– A request contains
• one or more identifiers for Dataset, StitchedMosaic, or
DataSeries.
• zero or more spatiotemporal subsetting criteria using long,
lat, phenomenonTime (i.e., in WGS84 and/or ISO 8601)
• an optional “sections” (All, CoverageDescriptions,
DatasetSeriesDescriptions)
• an optional “containment” (contains=completely within,
• overlaps=anything touched, default)
– A response includes the descriptions of the matched data items.
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Web Coverage Service 2.0
Protocol Bindings
–
–
–
GET
POST
SOAP
Format extensions
–
NetCDF Encoding Format Extension (V1.0 finished, 10-110)
–
–
–
GeoTIFF Encoding Format Extension (progressing, 10-147)
JPEG2000 Encoding Format Extension (progressing)
HDF-EOS Encoding Format Extension (not started)
Protocol Bindings
–
–
–
Range Subsetting Service Model Extension
Scaling & Interpolation Service Model Extension
Predefined CRS Service Model Extension
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Implementation
• Supported data products
–
–
–
–
–
–
HDF-EOS2 Grid, including MOD13C1, MOD09GQ, MYD15A2
HDF-EOS2 Swath, including MOD05_L2
HDF-EOS5 Grid, including Aura OMSO2G
HDF-EOS5 Swath, including Aura OMDOAO3
HDF4, Tropical Rainfall Measuring Mission (TRMM)
NetCDF, NOAA GOES Imager data
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Implementation
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Implementation
• Delivery method
– File stream
– File URL
– Multi-part: metadata and file stream
• Sample URL
– geobrain.laits.gmu.edu/cgibin/ows8/wcseo?service=wcs&version=2.0&request=getcoverage&cove
rageid=MOD13C1.A2009241.005.2009261200123.hdf&subset=Lat,http:
//www.opengis.net/def/crs/EPSG/0/4326(20,40)&subset=Long,http://ww
w.opengis.net/def/crs/EPSG/0/4326(-120,100)&format=image/geotiff&outputCRS=EPSG:32612&mediatype=multi
part/mixed
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Implementation
req
req
Conformance
Test Engine
ESA Data
req
res
(EO) WCS
NASA Data
Integrated
Client
WPS
res
res
(EO) WCS
@GMU
WCPS
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Useful links
• Open Source License
– MIT license
• Source Code Link
– http://geobrain.laits.gmu.edu/ows8/wcseo/code/gmu_eowcs_
v0.1.tar.gz
• Online Document Link
– http://geobrain.laits.gmu.edu/ows8/wcseo/doc/index.html
• User Guide Link
– http://geobrain.laits.gmu.edu/ows8/wcseo/demo/wcseodemo
.html
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Future Work
• Update the open-source package with the release of
new WCS specification extension.
• Add the CF-NetCDF support
• Support more HDF-EOS5 data products
• Data Lineage (ISO 19115)
• Integrate OGC CSW service to find data
– http://cwic.csiss.gmu.edu
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Thank you!
Yaunzheng Shao
George Mason University
[email protected]
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