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ICEDS – Creating a flexible geospatial information service Jeremy Morley, Prof. Jan-Peter Muller, Nuno Gil*, Cristiano Giovando + Dept. Geomatic Engineering,

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Presentation on theme: "ICEDS – Creating a flexible geospatial information service Jeremy Morley, Prof. Jan-Peter Muller, Nuno Gil*, Cristiano Giovando + Dept. Geomatic Engineering,"— Presentation transcript:

1 ICEDS – Creating a flexible geospatial information service Jeremy Morley, Prof. Jan-Peter Muller, Nuno Gil*, Cristiano Giovando + Dept. Geomatic Engineering, UCL Oliver Greening, Rob Scott ESYS plc * - now with ESRI Portugal + - now at UCSD

2 Original Motivation CEOS Landsat and SRTM Project (CLASP) –NASA has provided SRTM (shuttle Radar Topographer Mapper) and 3 sets of orthorectified Landsat data to UN –The UN wish to maximise access to these data to all of its agencies –CEOS (Committee on Earth Observation Satellites) agencies offered to assist the UN and NGOs in providing developing countries with internet access to global mosaics of Landsat and SRTM data through the provision of a number of integrated but distributed data servers. (part of the CEOS EO Data Portal) –Exploitation of Open Geospatial Consortium interoperability standards –Continental datasets could eventually be hosted by different CEOS member space agencies using Landsat and/or SRTM data as a raster background

3 On-line GIS Fast developing area New distributed processing technologies: –Web services components (SOAP) –Grid processing Aided by standards –Data transfer formats –Data access methods –OpenGeospatial Consortium central + ISO TC/211 ICEDS: Integrated CEOS European Data Server –Demonstrator sponsored by British National Space Centre International Co-operation Programme (ICP-2)

4 ICEDS: Integrated CEOS European Data Server

5 ICEDS Phase 1&2 Achievements Promoting Web access to large datasets –Europe (to Urals) and Africa –SRTM & Landsat mosaics Prepared OGC-compliant: –Web Map Service (WMS) –Web Coverage Service (WCS) –Portal website Provided detailed documentation on data preparation process Exploited open access (i.e. open source / freeware / free to download) software –MapServer:

6 Software UCL GE Dept. software: –ENVI 4.1 (SRTM and Landsat processing and editing) –ArcView 3 and ArcGIS 8.3 (coverages and vector data processing) Free software: –DLGV32 Pro NASA release (SRTM colourised hillshading) –MicroDEM Libraries and tools –GDAL libraries: GDALtileindex (shapefile indexing) –Global Mapper (full version of DLGV32 – low cost) –Free libraries for use with MapServer (including GDAL) Map servers tested –MapServer –IONIC RedSpiderWeb 3.1 (WMS setup and website design) Various IONIC tools (indexers, editors, pyramid-creator) –DeeGree v.1 Deegree tools: runtileimage2

7 JPL Landsat 5 Africa mosaic 15 DVD-ROMs –13 DVD-ROMs holding 30m mosaic –Other two holding subsampled versions, e.g. 300m Full-res. data stored as 5º x 5º tiles –1 file per band; 3 bands (Landsat 1,2,3) –324MB per file –GeoTIFF format –Not contrast stretched, beyond mosaicing Reduced res. data: all bands available, stretched.

8 JPL Landsat 5 Africa mosaic contrast enhancement & retiling

9 Retiling operation was performed into –5ºx5º contrast stretched composite tiles (WMS) –0.5ºx0.5º tiles in separate bands (WCS) Performed with DLGV32 / Global Mapper using a text batch script file produced with a perl routine Pyramidal structure for WMS Current resolutions are: – 1 arcsec/pixel from scale 1:1 to 1: (14302 tiles) – 10 arcsec/pixel from scale 1: to 1: (1020 tiles) – 100 arcsec/pixel from scale 1: to max (1 tile) Each level has its own index file to allow the map-server application to find and get the right files JPL Landsat 5 Africa mosaic – retiling & pyramidal structure

10 SRTM retiling & hill shading For portrayal in WMS, preferred portrayal for SRTM was colourised & hill shaded. –DLGV32 or Global Mapper preferred software –Handles SRTM HGT; can take user-defined colour table Unedited SRTM data contains elevations over ocean – these masked out in hill shaded images An additional issue: raw HGT files from EDC contain additional overlap pixels Overlap pixels need to be removed for processing in Global Mapper / DLGV32

11 SRTM data preparation Masking The background colour (red) shows voids in the SRTM data Hill shading A colour table has been defined reflecting atlas- like colour ranges SRTM tiles intersecting coastline DEM mosaicked in 4 regions (NW, NE, S, Azores) Azores included in Europe and Africa – political versus geographic affiliations Inland tiles do not need masking Smart processing

12 SRTM retiling & hill shading

13 SRTM pyramidal structure Current resolutions are: – º/pixel from scale 1:1 to 1: (1-16 tiles in view) – º/pixel from scale 1: to max (1-18 tiles in view) Both levels have their index file to drive the map- server application to get the right files

14 ICEDS Phase 3 goals (by12/05) To extend Web access to global datasets –SRTM & Landsat mosaics –GTOPO30/SRTM30 to extend beyond area of SRTM –Web map services (transportation, built settlements) –Internal WMS/WCS as well as attach new layers on the fly –MODIS WMS products where available To develop an on-line map annotation and output –To allow users to add simple on-line annotations (e.g. text) –To allow users to take a snapshot of their map and output this as a high-quality PDF To develop new visualisation capabilities –Use of transparency, flicker, colour LUTs to combine data To promote use in Africa and encourage other space agencies to set up their own CLASP servers

15 Additional datasets SRTM3 DEM coverage extended to full coverage SRTM30 DEM coverage of world JPL Landsat 5 mosaic extended to Europe –currently a missing column of tiles as supplied! –band 4 available in addition to 1-3 (WCS only) DMSP night-time lights layer (radiance) Additional cascaded layers, e.g. –near-real time IR cloud map (CustomWeather) –NASA Aster DEM coverage (from USGS) –SIGAFRIQUE (from BRGM)

16 ICEDS map client Purely OGC-based services Hence separation of client and server(s) Increasing range of off-the-peg OGC clients, e.g. –ka-Map! (http://ka-map.maptools.org/) –Chameleon (http://www.dmsolutions.ca/technology/chameleon.html) ICEDS client based on Ionics GAF client –Javascript only –Good browser compatibility: PC & Mac IE, Mozilla/Firefox, Mac Safari

17 ka-Map!

18 Interface upgrades Download source data from ICEDS WCS via icon on web interface Colour scale for SRTM hill-shading –updated for global height range Solved PNG transparency problems –compatibility improved: tests on IE & Mozilla/Firefox on PC & Mac; Safari on Mac Testing a sketch annotation method (part of a separate project) Additional layer list controls

19 Overall functionalities Connection to real-time and near-real time services Drill-down to anywhere on the planet to scales of 1: Explore change (e.g. Landsat 5 to 7) and context (e.g. rivers, transportation networks) Explore geographical relationships at the continental and global scale (e.g. sea-level rise impact of global population)

20 Current portal

21 Drill down to anywhere and overlay digital map data on SRTM

22 At any scale with Landsat5

23 Current portal - Night-time lights

24 Displaying natural hazard locations

25 Displaying global NRT clouds

26 Displaying geological Maps

27 And download data

28 And download data… GeoTIFF file, current zoom. Limited area. Source data (e.g. DEM, not hillshade)

29 Latest interface upgrades Partial layer opacity Flicker function

30 Partial layer opacity SIGAFRIQUE geology over hill-shaded SRTM DEM

31 Partial layer opacity NASA ASTER DEM footprints on hill- shaded SRTM DEM (red = SRTM gaps)

32 Layer flicker tool Launch movie

33 Connecting to the service

34 Simple client based on the client/server architecture developed with IDL –Code is easily portable via an IDL virtual machine which is freely available Allows on-line connection to the ICEDS WCS server –Signed 16-bit data retrieval –Display 3D perspective views of SRTM DEM –Vertical exaggeration control parameter –Possibility to choose desired area by BBox WCS client

35 WMS Connection from ArcGIS

36 WMS connection from Google Earth

37

38 WMS connection from osgPlanet

39

40 WCS Connection from Cadcorp SIS

41 Comsine: WCS demonstration - orthorectification wcs_url = 'http://iceds.ge.ucl.ac.uk/cgi- bin/wcs?map=wcs.map&SERVICE=WCS&REQUEST=GetCoverage& COVERAGE=srtm&FORMAT=GEOTIFFINT16' res = max(tif_pixsize_x, tif_pixsize_y) wcsRequest = wcs_url + "&CRS=EPSG:" + str(epsg) + "&BBOX=" + bbox + "&RESX=" + str(res) + "&RESY=" + str(res) logger.info("WCS REQUEST " + wcsRequest) if (dem == None): demFilename = str(time.clock()) + ".tif" urllib.urlretrieve(wcsRequest, filename) cleanup = 1

42 GeoConnections Canada

43 Conclusions Implementations of continental-scale data serving using OGC technologies Providing data & portrayal (WCS/WMS) services User-selectable data freely and instantly available at full resolution Guidelines for setting up your own server available Scripts/software available Capability to add any cascaded WMS layers, such as EA-lidar and orthorectified IKONOS/Quickbird

44 Future Work Final debugging of flicker function for release Addition of CIESIN GRUMP global population data Cartographic output to PDF Annotation functionality Modularisation for interface internationalization Integration with JAXA / RESTEC Feedback from users!

45 JISC Interoperability Project ICEDS client / Ionic GAF provides a very flexible framework Within JISC Interop. Project, Digimap OS data with seamless scale-dependent datasets Also, feature digitisation Digitisation will send features to Ian Turtons XIMA server –if time, retrieval of previous features to client

46 Interoperability client (i)

47 Interoperability client (ii)

48 Interoperability client (iii)

49 Interoperability client (iv) To be submitted to Ian Turtons XIMA server…

50 Interoperability client (v)

51 ICEDS: Integrated CEOS European Data Server Jeremy Morley


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