Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

WMS Global Mosaic

George Percivall NASA Geospatial Interoperability Office

Global Science and Technology, Inc. percivall@gsfc.nasa.gov

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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.

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Africa Modis

Gombe Stream National Park

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

East Africa - Modis

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Tanzania - Landsat

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Wide Gombe - Landsat

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Gombe Max resolution

~3 km

~4 km

30 m resolution

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Wide Gombe - Landsat

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

Gombe Max resolution

~3 km

~4 km

30 m resolution

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce Reduced Resolution Global: completed

useful for color balance refinement

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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

Geo

spat

ial

Inte

rope

rabi

lity

Offi

ce

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