NASA WMS Global Mosaic - circa 2004
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Transcript of NASA WMS Global Mosaic - circa 2004
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WMS Global Mosaic
George Percivall NASA Geospatial Interoperability Office
Global Science and Technology, Inc. [email protected]
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Integrated, digital representation of the Earth, widely accessible for humanity's critical decisions
WMS Global Mosaic
• Global mosaic of Landsat 7 scenes – Georectified imagery – 30 & 15 m resolution
• OpenGIS® Web Map Service (WMS) – False-color rendering of 9 bands – Pan-sharpened
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Landsat Global Data Set
• 1st global, systematically compiled, ortho-rectified, generally cloud-free Landsat dataset – Highest resolution, multispectral,
orthorectified, global data available • 8,500 orthorectified Landsat ETM+ scenes.
– NASA-Stennis procurement – Earthsat, inc. produced – Scenes available through USGS and others
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OpenGIS Web Map Service (WMS)
• Interface for a web browser or portal to request a map, suitable for geographic overlay
• Main WMS operation: GetMap request – Defined using WWW protocols, e.g., http – Response to a GetMap request: a map of
georeferenced data. • Individual map layers requested from different
servers overlaid in web browser – Distributed Web Mapping
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WMS Global Mosaic - Trade Study
• GIO identified Landsat 7 ortho dataset as basis for a WMS Global Mosaic – Trade study of possible approaches, selected an
optimum approach to meet NASA Requirements • “MapUS” map server
– Previously developed JPL WMS, mosaic of Landsat 5, contiguous US
– Regularly used layer for OpenGIS activities • Selected option: JPL WMS and Landsat 7
Global Data Sets – CONUS is 5% of world; 20x increase for global – 15m pan band almost 2x amount of data again
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Building the WMS Global Mosaic
Funded and managed by GIO; under construction at JPL; Lucian Plesea, Team Lead; Dave Curkendall, Sr Advisor
• Storage: ~10TB needed – Raid Again Storage using Commodity Hardware And Linux
(RASCHAL) - 40TB shared
• Mosaicing code – SGI Image Vision Library; a few custom image operators – Color balance: visually pleasant, yet preserve features
• JPL WMS – Web Mapping Service (WMS), Version 1.1.1. – Style layer descriptor (SLD) on multi-band images – Pan-sharpening - new for WMS
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WMS Global Mosaic Status - Jan. 2004
• RASCHAL Storage: ready and operating • JPL WMS: ready, running including SLD
– OGC WMS Conformance testing • Mosacing code: optimizing for speed and
portability • Mosaic
– 15m Resolution, US and Africa: initial run – Reduced Resolution Global: Done; color balance
refinement – 15m Resolution Global: initial run underway,
7884 unique scenes.
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Gombe Stream National Park
• Small roadless forest: home to monkeys, baboons, and the world's most-studied chimpanzees
• In Tanzania – along the shore of Lake Tanganyika
• Coordinates – 04° 42' 00" S 029° 37' 00" E – - 4.700° S 29.617° E
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Africa Modis
Gombe Stream National Park
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East Africa - Modis
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Tanzania - Landsat
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Wide Gombe - Landsat
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Gombe Max resolution
~3 km
~4 km
30 m resolution
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Wide Gombe - Landsat
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Gombe Max resolution
~3 km
~4 km
30 m resolution
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ce Reduced Resolution Global: completed
useful for color balance refinement
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A Historical Perspective
~1500 ~2000
Data of Voyages of Discovery �- late 15th Century�- e.g, da Gama, Columbus, � Vespucci, Magellan
Landsat Global Datasets - �first, complete, medium-resolution observation of the Earth
Atlas Publishing, �- map projections
Web Publishing�- OpenGIS WMS
First maps of the Earth - Piri Reis (1513)- Gerardus Mercator (1538)
WMS Global Mosaic
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WMS Global Mosaic
• Access to WMS Global Mosaic – OGC Document 03-111 – http://onearth.jpl.nasa.gov/
• Transition Mosaic to Industry – Mosaic to be available to parties that express
interest in hosting as WMS • WMS Global Mosaic provides
– New means to explore and understand the Earth – Integrated digital representation of the Earth,
widely accessible for humanity's critical decisions