GeoWeb2009 presentation: Long Island Index & OASIS
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GeoWeb2009 presentation: Long Island Index & OASIS



Presentation to Academic Track of GeoWeb 2009: Leveraging Interactive AJAX Web Tools for Online Maps

Presentation to Academic Track of GeoWeb 2009: Leveraging Interactive AJAX Web Tools for Online Maps



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GeoWeb2009 presentation: Long Island Index & OASIS GeoWeb2009 presentation: Long Island Index & OASIS Presentation Transcript

  • Leveraging Interactive AJAX Web Tools for Online Maps Presentation at GeoWeb 2009 – Academic Track Steven Romalewski CUNY Mapping Service The Graduate Center / City University of New York July 2009
  • The Challenge GeoWeb 2009 – CUNY Mapping Service
    • Transit connections between where people live and where they work across Nassau and Suffolk counties;
    • Long Island’s downtowns in relation to multi-family housing density plus access to parks and open space;
    • The communities with the highest proportion of multi-family units compare with regional views of age of housing stock ;
    • Income attributes of any given community plus its concentration of rental units ;
    • Brownfield locations compared with population patterns by race/ethnicity;
    • All of this and more with aerial photography …
    … on a map, all at once, interactively, online. The Long Island Index wants to show (among other things):
  • Mapping Multivariate Data GeoWeb 2009 – CUNY Mapping Service
    • Multiple symbol types
    Some traditional cartographic techniques …
    • Small multiples
    • Multivariate dot density maps
    • Different textures
    • Transparency (eg., color coded DEM “draped” over hillshade)
  • Map display on the desktop GeoWeb 2009 – CUNY Mapping Service Integrates many of the multivariate approaches
  • Map display on the desktop GeoWeb 2009 – CUNY Mapping Service Also can leverage emerging geostatistical software packages with multi-framed display of integrated data Data_Mining_in_GeoVISTA_Studio.pdf
  • Map display on the desktop GeoWeb 2009 – CUNY Mapping Service But… How does this translate online?
  • Online map display GeoWeb 2009 – CUNY Mapping Service
    • PROs
    • Interactive
    • Zoom in very close or out very far with ease
    • Add or remove “layers” of data from the map
    • “ Slippy” maps easy to navigate
    • CONs
    • Single frame generally rules out small multiples
    • Multiple symbol types (including dot density and texture) generally don’t translate well for thematic/analytical maps
      • but they can work well overlaying roads with choropleths, for example
    • Transparencies would work, but until recently the cumbersome nature of webpage redraws makes this clunky
    • Also, challenge of keeping it simple while making GIS analytic tools accessible
  • Enter AJAX, applied to online maps
      • Open Source movement rapidly making new tools more accessible, encouraging experimentation and early deployment
      • Geoserver & Mapserver, OpenLayers, etc
      • ESRI also enhancing their toolkit
      • New ArcGIS Server tools – caching, etc
    • Some early adopters of innovative approaches:
    GeoWeb 2009 – CUNY Mapping Service
    • Online mapping in a post-Google Maps world
      • Ease of use and intuitive display
      • Relatively easy integration of multiple data sets from disparate sources (ie, mashups)
      • No need to click on a “ i ” tool to access attributes, or click a “hand” tool to pan the map, for example
  • New York-area examples GeoWeb 2009 – CUNY Mapping Service
    • Early 2006, CUNY Mapping Service established with broad mandate – help CUNY researchers and others leverage the power of GIS in their work, and continue developing cutting-edge interactive online mapping systems
    • Long Island Index project asked us to develop interactive mapping feature for
      • Index background – needed to make complex issues more understandable to public (esp. to visualize inter-relationships and multi-level spatial patterns) and to engage people via the Web
      • A second project is a complete overhaul of the Open Accessible Space Information System (OASIS) website ( ), first created in early 2000 using ArcIMS in collaboration with ESRI, USDA Forest Service, and more than 40 local NGOs, public agencies, businesses, and individuals.
  • A hybrid “geo stack” GeoWeb 2009 – CUNY Mapping Service
    • Technology choice: combination of ESRI/Microsoft with open source JavaScript frameworks
    • ArcGIS Desktop and ArcSDE/SQL Server to manage the data sources.
    • ArcGIS Server to generate web map services from MXDs and generate cached tiles for selected map layers.
    • OpenLayers consumes WMS resources, manages and displays the map layers, and provides map navigation tools.
    • Dynamic data feeds are also provided via REST web services.
    • Ext JS provides the overall web framework and enables us to relatively easily integrate AJAX-style tools such as dynamic transparencies.
    • With the exception of the satellite/aerial photos, we host all map layers
    • Simply too much data to simply mash it up with a basemap from Google Maps or Microsoft and we wanted cartographic control.
    • When you select a village:
    • It’s highlighted in orange ;
    • Local statistics and charts are displayed; and
    • The overview map shows where on LI you’ve zoomed to.
    The Long Island Index interactive map – visualize your community in new and powerful ways 1 2 3 Map your village
  • See population or housing patterns in and around your community
  • Map education statistics district-by-district – NEW for 2009!
  • Add transportation routes, schools, environmental sites, special districts, and more
  • The transparency slider 0% transparent 50% transparent 100% transparent reveals what’s underneath
  • Compare aerial photos with Census and land use patterns 0% transparent 70% transparent 100% transparent Click on the red marker for a bird’s eye view
  • Explore regional views of key demographic indicators You can zoom out to see the entire island, and then double-click on the list to zoom back in and see community-level detail.
  • For more info, contact: GeoWeb 2009 – CUNY Mapping Service Steven Romalewski, Director Phone: 212-817-2033 [email_address] CUNY Mapping Service at the Center for Urban Research The Graduate Center / CUNY 365 Fifth Ave., Room 6202 New York, NY  10016 David Burgoon, Application Architect Phone: 212-817-2038 [email_address]