Description Of The JPL Planetary Web Mapping Server

Lucian Plesea, Elaine Dobinson, Dave Curkendall - JPL

Trent Hare – USGS, Flagstaff

ISPRS Workshop, March 17, 2007

http://webgis.wr.usgs.gov/ogchttp://onMars.jpl.nasa.gov

ISPRS, Mar 2007 Plesea / Hare

Outline

• Open Geospatial Consortium Standards

• OnMars / OnMoon Project Overview

• Server Description

• Examples and integration scenarios

ISPRS, Mar 2007 Plesea / Hare

define: OGC Web Services

• Currently Addressed– WMS: Web Map Service – simple image– WCS: Web Coverage Service – complex data

• Closely Related Services– WFS: Web Feature Service – features – WPS: Web Processing Service – data processing– Catalog Service – metadata spatial searching– GeoRSS – RSS feed + geospatial coordinates

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OGC Web Mapping/Coverage Services

Data Server

`

Data Analysis Tool

`

GIS Software

Web site

CommonLanguage

Process RequestReturn Result

WMS/WCS

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Benefits to Using Standards

• Don’t reinvent the wheel– Leverage existing languages, structures, and solutions

• Reach a wider audience– Widely used applications have built-in support for accessing

standard services

• Evolution– Well-maintained services evolve along with standards, extending

their healthy lifespan;

data / software / server persistency

• NASA OGC interoperability report showed a 30% savings

Helps make the data the focus, not the application

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Project Overview

• Promote web mapping services for planetary applications

– Standardize planetary coordinate systems with the OGC

– Develop WMS and WCS servers for Mars and Lunar data

– When necessary, prepare GIS data sets

– Adapt GIS (client) applications for Mars and Lunar GIS

– Test and propose further integration with PDS Imaging Nodes

– Updated USGS/PDS Map-a-Planet has incorporated WMS and planetary encodings

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Planetary WMS Block Diagram

Remote Storage Cache Storage

Network Image

WMS Server (CGI)

HTTPD (Apache) Tiled WMS & KML

Tiled WMS KML

•Relative size is not significant•Only data flow is represented

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Raschal, 40TB cluster

RAID Again System using Commodity Hardware And Linux

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Outline of Major Server Features

• Data sets• Planet specific CRS, IAU2000 as the namespace• Style Layer Descriptions (SLD) extensions• Cache/Tile support• Support for 16, 32 bit data requests (Geotiff)

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Features – Data sets

• Mars– MOLA DEM and Slope - Global Topography, Goddard

• Request as topography, colorized, shaded, slope– Mars Digital Image Mosaic 2.1, USGS– THEMIS Infrared (IR) Mosaics, ASU

– MOC Narrow Angle Mosaic, USGS/JPL

– Working on a THEMIS VIS mosaic, ASU

• Moon– Lunar DEMs and Slope (ULCN2005), Goddard and USGS– Clementine 750nm UVVIS and NIR Mosaics, 16bit, 11 bands,

USGS– Airbrushed Hillshade (Grey and Color), USGS

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Features - OGC Planetary Coordinate Reference System

• Planetary Namespace based on IAU2000 report and using NAIF codes for base value.

GEOGCS["GCS_Mars_2000",DATUM["D_Mars_2000", SPHEROID["Mars_2000_IAU",3396190.0, 169.89444722361]],PRIMEM["Reference_Meridian",0.0], UNIT["Degree",0.0174532925199433]

http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1931.pdf

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Features – SLD / Processing WMS

• SLD implementation increases server-side processing requirements

• Supports most SLD RasterSymbolizer: band selection, gamma correction, linear scaling, histogram equalization, color look-up

• Jpeg, PNG and GeoTIFF formats• Geographic, Orthographic and Gnomonic

projections (planet specific)

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Features – SLD / Band Arithmetic (server side)

• Band Arithmetic – e.g. Clementine mineral ratios

Red=750 nm/415 nmGreen=750 nm/950 nmBlue=415 nm/750 nm

SLD encapsulation: prefix notation

/_b1_b2,/_b1_b3,/_b2_b1

Currently supports arbitrary length formulae, four basic operations and constants

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Features – Cache/Tiled WMS

• WMS needs a mechanism to expose caches• Add one request type, getTileService• Returns an XML wrapped list of WMS requests, used

as template• Image data is delivered only by WMS• Compatible with WMS 1.1.1 and SLD• OnMars Tiled WMS has latencies in the order of

milliseconds

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Selected Clients

• NASA WorldWind, uses tiles• WorldKit, flash WMS viewer using tiles• GoogleEarth, full WMS client, uses tiles• WMSConnect, ESRI arcscript to use WMS

images as data, ArcGlobe uses tiles• JMars• PIGWAD• JUMP, OpenLayers, OpenEV, Global Mapper, uDig

(geoTools) , gvSIG

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Google Earth – WMS Client

• Use refresh style onRegion• Data Transport is a WMS request• KML request is almost a WMS request.• Returned KML can include sub-regions• Requires Google Earth 4 or later, on a platform that

allows arguments• This functionality integrated in OnMars Tiled WMS

server

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Planetary WMS Block Diagram (review)

Remote Storage Cache Storage

Network Image

WMS Server (CGI)

HTTPD (Apache) Tiled WMS & KML

Tiled WMS KML

•Relative size is not significant•Only data flow is represented

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Planetary OGC Examples

JPL’s WMS onMars: showing Mars Topography (with SLD – Style Layer Desc.)

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NASA’s Worldwind accessing JPL’s WMS server (16 bit Png for topo, Image texture, topography colorized using SLD and transparent over image)

2X

Planetary OGC Examples

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Multiple Servers JPL’s OnMars, USGS’s PIGWAD, ASU’s JMars

Planetary OGC Examples

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WMS Connect (client builds local layers)

Novel use of WMS servers

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Sparse Data Support – MOC NA

MGS Mars Orbiter Camera Narrow Angle mosaic

• A 0.5 arc-second composite of more than 50,000 high

resolution images of Mars, located between 75N and 75S• It is an uncontrolled mosaic, the images are placed on the

global frame based on the best known location, using a simple warp. Location errors are common, but it does match MDIM and MOLA rather well

• The mosaic contains more than 300GB of raw image data, and images are still to be released

• Credits: MSSS/JPL/Caltech/USGS/ASU/UofA/NASA• Tackle an uncontrolled THEMIS VIS mosaic also.

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Live MOC NA Image Mosaic, ~50K images, ~3TB mosaic stored as 130GB

Planetary OGC Examples

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NULL data masks

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JPL Server Optimization, WorldKit (flash-based viewer)

ThemisMoc NA Mdim2.1

GE