Geospatial Interoperability Demonstrator Project

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Geospatial Interoperability Demonstrator Project
Gail Millin MIMAS Open Forum 29th June 2005
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Introduction

• Interoperability project aims and objective
• Data preparation
• Serving imagery
• - University of Minnesota MapServer
• - ER Mappers Image Web Server
• Developing a web client
• - RightWebMap 7.0
• Future aims

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Interoperability Team
http//www.mimas.ac.uk/ http//camber.mc.man.ac.u
k/iws/interoperability.htm
http//www.ge.ucl.ac.uk/ http//iceds.ge.ucl.ac.u
k/
http//www.edina.ac.uk/
http//www.nerc.ac.uk/
http//www.ccg.leeds.ac.uk/
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Objectives of the Project

• Aim to prove the feasibility of delivering
  geo-spatial data using OGC standards for GIS web
  services
• Primary objective is to develop a set of
  demonstrator applications which promote
  interoperability between distributed data sources
• Why? To maximize value and enhance interactivity
  between spatial datasets

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Overall Project Outcomes

• A range of OGC based web services (WMSWFSWCS)
  (MIMAS, UCL, EDINA and NERC)
• A basic annotation web service (XIMA) (CCG, Leeds
  University)
• A series of demonstrator clients (assigned to UCL
  but also developments at MIMAS and EDINA
  occurring). The clients will illustrate
• Access to data
• A teaching focused use case (Urban Expansion)
• A research focused use case (Planimetric - based
  on dynamic image registration using web services)
• A report on the utility and issues surrounding
  implementation of open standards for geospatial
  data within JISC, including an assessment of
  security and access authorisation issues

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MIMAS Data Provision Preparation

• Landsat 5, Landsat 7 (Pan and fused), SPOT,
  Ortholandsat 5/7 and Hillshade provided as part
  of Landmap Project http//www.landmap.ac.uk
• Pyramiding 25m, 50m and 100m resolution for
  ortholandsat 5 and 7 stretched mosaics.
• Tiling Shapefile index created for tiled data,
  improve server response time by requesting tiles
  that fall into the bounding box defined by the
  user.
• Band Combinations Landsat 5 mosaic bands 7,4,2
  highlight urban areas in pinkish purple colour.

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Serving Spatial Data - OGC Standards

• Open Geospatial Consortium (OGC) - a non-profit,
  international, voluntary standards organization
  that is leading the development of standards for
  geospatial services
• Their aim is to advance geo-processing
  interoperability across the GIS industry
• Defines web service implementation specifications
  for
• Web Map Services (WMS)
• Web Feature Services (WFS)
• Web Coverage services (WCS)
• For documentation - http//www.opengeospatial.org/
  specs/

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WMS, WFS and WCS

• 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.
• MIMAS is providing WMS and WCS at present.

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University of Minnesota MapServer

• MapServer is a freely available, open source
  development environment, offering support of WMS
  and WCS http//mapserver.gis.umn.edu/
• Requires a variety of supporting libraries e.g.
• - PROJ 4 for on-the-fly projection
• - Geospatial Data Abstraction Library
  (GDAL) a translator library for raster data
• MIMAS installed MapServer 4.4.1 on Windows Server
  2003 using IIS 6.0

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Configuring MapServer for WMS

• MIMAS MapFile Structure

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WMS Layer Element of the MapFile
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WMS GetMap Request

• Once a MapFile has been created a GetMap request
  can be submitted to MapServer e.g.
• http//camber.mc.man.ac.uk/cgi-bin/mapserv.exe?map
  c\Inetpub\wwwroot\MIMAS\wms_mimas_mosaic.mapVER
  SION1.1.1REQUESTGetMapSRSEPSG27700BBOX0,0,
  700005,1050000WIDTH700HEIGHT700LAYERSLandsat
  7Mosaic15mFORMATimage/jpeg
• As part of the interoperability project GetMap
• requests have been produced for the
• Orthospot mosaic, Landsat 7 15m 25m
• mosaics, Landsat 5 mosaics, Ortholandsat 5
• and 7 stretched mosaics at 100m, 50m and
• 25m resolution in tiff format and at 25m
• resolution in ecw format.
• .

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WMS GetCapabilities Request

• All the imagery being provided by MIMAS for the
  interoperability project can be listed using a
  GetCapabilities request
• http//camber.mc.man.ac.uk/cgi-bin/mapserv.exe?map
  c\Inetpub\wwwroot\MIMAS\wms_mimas_mosaic.mapREQ
  UESTGetCapabilities
• This request is useful to discover information
  about a WMS, the layers contained in the WMS, the
  projection the data is being served in, metadata
  information, access constraints and contact
  information about the organization providing the
  data.

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WCS GetCapabilities Request

• As with the WMS a WCS MapFile is required to
  configure MapServer to execute WCS requests
• A GetCapabilities request for WCS can be used to
  find out information about the service
• http//camber.mc.man.ac.uk/cgi-bin/mapserv.exe?map
  c\Inetpub\wwwroot\MIMAS\wcs_mimas_mosaic.mapSER
  VICEWCSREQUESTGetCapabilities
• This request refers to wcs_mimas_mosaic.map
  rather than the wms_mimas_mosaic.map. So how does
  the WCS MapFile differ from the WMS?

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WCS MapFile

• Mapfiles for WCS must contain -
• LAYER NAME,
• TYPE RASTER
• LAYER DUMP TRUE
• Metadata parameters prefixed with WCS or OWS in
  both the WEB element and LAYER element.

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Get Coverage Request

• When using the below URL a download dialogue box
  will appear and will prompt the user to save the
  file.
• http//camber.mc.man.ac.uk/cgi-bin/mapserv.exe?ma
  pc\Inetpub\wwwroot\MIMAS\wcs_mimas_mosaic.mapSE
  RVICEWCSREQUESTGetCoverageCoverageLandsat7Pan
  BBOX0,0,700005,1050000CRSEPSG27700RESX75RE
  SY75FORMATecw
• For MIMAS coverages save the file with a .ecw
  extension.
• The coverage can then be viewed and used in an
  image processing package e.g. ERDAS Imagine and
  ER Mapper.

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ER Mappers Image Web Server

• Alternative for serving imagery is Image Web
  Server 7.0
• Image Web Server provides ECW high speed
  streaming for all Landmap imagery and is also OGC
  WMS compliant
• ECW streamed imagery can be accessed at
  http//camber.mc.man.ac.uk/rightwebmap/image_strea
  ming.htm
• GetCapabilities request for IWS is
  http//camber.mc.man.ac.uk/ecwp/ecw_wms.dll?reques
  tGetCapabilitiesservicewms

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MIMAS Image Streaming Viewer
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MIMAS Web Clients RightWebMap

• RightWebMap from ER Mapper integrates multiple
  image servers into single application.
• Supports OGC WMS, ECWP, MapServer and ArcIMS
  protocols
• Using this technology two new clients have been
  created as examples of interoperability
• Planimetric user case for a research application.
  
• Urban expansion user case for a teaching
  application.
• WMS include ICEDS, EDINA, MIMAS and DEMIS

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Features of MIMAS Web Client

• Interface can be changed to display the viewer in
  frames or windows format.
• Layers from two different WMS can be integrated
  together and transparency adjusted.
• Links available in menu bar to download raster
  imagery from Landmap
• The data can be queried and explored using the
  navigational tools.
• The Order of the WMS services/layers can be
  changed.

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MIMAS Planimetric Use Case - Frame
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MIMAS Urban Use Case - Window
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MIMAS ICEDS WMS
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Interoperability Issues

• No legend for WMS as yet, EDINA is working on
  producing a GetLegendGraphic request
• Also issues with the same colour being used to
  symbolize two different map items which clash
  when the WMS are put together
• Background halos behind feature data looking
  pixilated when combined with satellite imagery

• WMS in different map projections. Solved by
  cascading the WMS from ICEDS and EDINA into a
  MIMAS mapfile and re-projecting on-the-fly the
  data into EPSG 4326 from EPSG 27700.
• Reduced quality of imagery when downloading as
  WCS MIMAS data requested at 75m resolution.

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Future Aims

• WCS dynamic downloading of data
• Incorporate the annotation service (from CCG) to
  the demonstrator projects
• Explore other web client options e.g. DM
  Solutions Chameleon 2.0
• Assist the interoperability team with the
  ability to produce legends for WMS
• Trial run the web client and get feedback from
  the users on ways to improve the interface and
  WMS

WCS Download
FINISH
Please Fill Out the Questionnaire! ?
START

• The team also needs to look at issues of
  security and data constraints, an authentication
  system such as Athens would be required if the
  clients were to be developed as services.

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Contact Details

• E-mail Gail.Millin_at_manchester.ac.uk
• Telephone [phone]
• MIMAS Interoperability Website -
• http//camber.mc.man.ac.uk/iws/interoperability.h
  tm
• Further Project Details - http//edina.ac.uk/proj
  ects/interoperability/
• Thanks for Listening! ?