1 / 27

Grid Enabling Satellite Data using OWS and GRASS

Grid Enabling Satellite Data using OWS and GRASS. Gail Millin Geodata Services Development Officer Pascal Ekin Software Developer Victoria, Canada FOSS4G 2007 24 th – 27 th September 2007. Mimas Data Centre. Main Activities. Satellite Data Provision to UK academia

alissa
Download Presentation

Grid Enabling Satellite Data using OWS and GRASS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Grid Enabling Satellite Data using OWS and GRASS Gail Millin Geodata Services Development Officer Pascal Ekin Software Developer Victoria, Canada FOSS4G 2007 24th – 27th September 2007

  2. Mimas Data Centre FOSS4G 2007 Victoria Canada

  3. Main Activities • Satellite Data Provision to UK academia • Geospatial Support Services • Educational Materials • Research and Development • New Data Delivery Infrastructure • Applications of Radar & Optical Data • Dissemination & Outreach FOSS4G 2007 Victoria Canada

  4. Who Uses Landmap? First 1000 Registered Users of the Landmap Service FOSS4G 2007 Victoria Canada

  5. Data Archive • Optical Collection • Landsat 5, Landsat 7, SPOT, MERIS • Radar Collection • ASAR (AP, WS, IM), ERS 1, ERS 2 • Elevation Collection • SRTM, 25m DEM, KGPS • Available to academics attending an institute that has signed a licensing agreement. • Free service since 1st August 2007 FOSS4G 2007 Victoria Canada

  6. Landsat 7 Bands 3,2,1 Landsat 7 Bands 7,4,3 Optical Collection - Landsat FOSS4G 2007 Victoria Canada

  7. Optical Collection - SPOT FOSS4G 2007 Victoria Canada

  8. Radar Collection - ASAR FOSS4G 2007 Victoria Canada

  9. Elevation Collection – DEM & KGPS FOSS4G 2007 Victoria Canada

  10. Landmap - Image Streaming • Image Streaming – ER Mappers Image Web Server 8.1 • Landmap Image Streaming Viewer • Free downloadable heavy clients • ArcGIS Explorer • Google Earth • GetCapabilities request for IWS • http://ims1.landmap.ac.uk/ecwp/ecw_wms.dll?request=GetCapabilities&service=wms FOSS4G 2007 Victoria Canada

  11. FOSS4G 2007 Victoria Canada

  12. FOSS4G 2007 Victoria Canada

  13. Landmap OWS • WMS – web application which provides a portrayal of geographic data which is stored on the server. • WFS – is an interface allowing requests for geographical features across the web using the XML based GML for data exchange. • WCS – defines how to provide satellite data over the internet. This differs from WMS as actual data values are sent. • WMS/WCS via OGC Landmap viewer or OGC compliant software • UDig • Cadcorp • ArcGIS FOSS4G 2007 Victoria Canada

  14. MapServer • Requires a variety of supporting libraries • PROJ 4 for on-the-fly projection • Geospatial Data Abstraction Library (GDAL) a translator library for raster data • GetCapabilities requests for GEMS II work • Landsat 5 - http://ims2.landmap.ac.uk/cgi-bin/mapserv.exe?map=..\chameleon\satellite\map\l5_wcs.map&SERVICE=WCS&REQUEST=GetCapabilities&WMTVER=1.0 • Landsat 7 - http://ims2.landmap.ac.uk/cgi-bin/mapserv.exe?map=..\chameleon\satellite\map\l7_wcs.map&SERVICE=WCS&REQUEST=GetCapabilities&WMTVER=1.0 • GetCoverage requesthttp://ims2.landmap.ac.uk/cgi-bin/mapserv.exe?map=..\chameleon\satellite\map\l7_wcs.map&SERVICE=WCS&REQUEST=GetCoverage&Coverage=orthol7_20123xs190600&BBOX=486600.00,252275.00,699975.00,468500.00&CRS=EPSG:27700&RESX=25&RESY=25&FORMAT=GEOTIFF FOSS4G 2007 Victoria Canada

  15. FOSS4G 2007 Victoria Canada

  16. Aim: To Provide Grid-enabled access to the aggregate statistics from the 2001 Census via OGSA-DAI on the National Grid Service Connect SQL Server database directly to the Grid via NGS Grid-enable current data access system Casweb to facilitate ease of use A fully working version was deployed on the NGS in November 2006 GEMS I http://casweb.mimas.ac.uk/ FOSS4G 2007 Victoria Canada

  17. GEMS II • Aim and Objectives • Grid enable a subset of the Landmap Service Data archive • Landsat 4/5 Thematic Mapper Scenes 1988 - 1992 • Landsat 7 1999 - 2002 • 25m Digital Elevation Model • GEMS II provide a data processing service on the National Grid Service using OWS & Grid technologies • Make use of 128 CPU/compute node • High processing power FOSS4G 2007 Victoria Canada

  18. GEMS II Use Case • Urban Change Detection for the UK • Satellite Image Processing renown for computer intensive tasks. “There are many studies that take place in the remote sensing community focused on change detection of urban areas; however these studies can be limited to local areas due to the lack of computer power to enable much larger areas to be assessed” (Comert, 2004) • Subset from the Data Archive for Use Case • Landsat 4/5 Thematic Mapper Scenes 1988 - 1992 • Landsat 7 1999 - 2002 • 25m Digital Elevation Model FOSS4G 2007 Victoria Canada

  19. GEMS II Architecture - Tier 1 • Provide the Visualisation of the WCS data results and querying of the CSW using OGC compliant clients on the Users System Clients Evaluated for this Role: • Cadcorp SIS MapBrowser • Free to download but not open source • Browse OGC Data services • Supports WMS, WFS, WCS • MPGC1.0 • Data menu allows users to add/remove WCS, WFS and WMS • Client offers image processing capabilities • Quantum GIS • Open source, free of charge GIS supports WMS and WCS results (GeoTiffs). • GRASS layers can be imported into the interface using a GRASS plug-in FOSS4G 2007 Victoria Canada

  20. GEMS II Architecture - Tier 1/2 • Developments of a GEMS GridRelay Client/Server Proxy • GEMS GridRelay client proxy - install on the user’s system • GEMS GridRelay proxy server – installed on Mimas Server (Linux OS) • Benefits of GridRelay • GridRelay allows user accreditation (Athens, UK eScience certificates) verifiable of the service side • Deployment of the client proxy is seamless • Works at the TCP level • GridRelay can be extended to include other authentication/authorisation protocols such as Shibboleth FOSS4G 2007 Victoria Canada

  21. GridRelay – Further Benefits • Dependent on traditional internet protocols & tools • OS independent as it is Java based • Very small (a jar file with few dependencies) • Configurable through an internet browser (developed) • Can be combined with existing Web Service protocols • REST, SOAP, WSDL, existing Grid Security (GSI) FOSS4G 2007 Victoria Canada

  22. Overview of GEMS II Architecture FOSS4G 2007 Victoria Canada

  23. GRASS - Scripts • Change Detection of Urban Areas • i.cluster – Clustering algorithm • Pixel clusters = imagery categories that can be related to land cover types on the ground • Output = Cluster spectral signatures, cluster means and covariance matrices • i.maxlik – Classifies the cell spectral reflectances in imagery data based on the spectral signatures generated by i.cluster • Output = Raster map layer of classified image in which each cell has been assigned a spectral class. FOSS4G 2007 Victoria Canada

  24. GEMS II Outcomes • Exploit GRID Technologies • Expand on OWS work initiated by the JISC funded Interoperability Project • Use OWS in a Grid Context • Users can benefit from high CPU computer power of the NGS • Create the use case demonstrator using Landsat 4/5, Landsat 7 and DEM FOSS4G 2007 Victoria Canada

  25. Future Developments • New Website – due to be released in January 2008 • New Release of ASAR data – January 2008 • Monthly acquisitions of TOPSAT data from QinetiQ • 10 images per month • International locations • 2m/3m resolution 3 band optical imagery • Extend the Image Streaming Viewer to display the recently updated metadata FOSS4G 2007 Victoria Canada

  26. Register • Institutes must sign a licensing agreement form to use the service after July 31st 2007 • 93 sites are already registered • The service is now free! • Further information available at http://landmap.mimas.ac.uk • Users require Athens Username and Password • Access to download area • Access to the online learning materials e.g. Image Processing Course FOSS4G 2007 Victoria Canada

  27. Thanks for Listening Enquiries spatial@mimas.ac.uk Website landmap.mimas.ac.uk FOSS4G 2007 Victoria Canada

More Related