Transcript No Slide Title

Data Management Options
for Mapping Biodiversity Data
Introduction
DSE makes extensive use of browser based mapping technologies to
support both intranet and internet business requirements.
• One of the environments used is a set of shared web mapping and
spatial database components collectively known as MapShare.
• MapShare sites deliver dynamically generated custom maps from
authoritative corporate data to internal and external users.
• Several MapShare sites deal with natural resource and biodiversity data.
• The complexity and size of some of the datasets plus the diversity of
user requirements, skills and privileges pose specific challenges in
implementing web mapping applications.
Context
Solutions to spatial data presentation problems need to be achieved
within the constraints of the current web mapping environment.
• Vector spatial data is stored in Oracle/SDE.
• Imagery is stored in an ER Mapper Image Web Server environment (IWS).
• ArcIMS is used to retrieve data from Oracle and generate a map image.
• Internet Mapping Framework (IMF) is used to configure the browser
interface and combine the images from ArcIMS and IWS.
• MapShare extensions to IMF are used to add additional functionality as
required to specific MapShare sites.
Ecological Vegetation Classes
Challenge:
• Statewide polygon dataset of several million features.
• Around 600 EVC classes to symbolise.
• Need to show potentially small areas of interest in a broad context.
Approach:
• Overlay EVC polygons over three standard grids covering the State.
• 10 minute, 5 minute and 1 minute grids for use at different scales.
• Provide filter tool so users can show general location of specific EVCs.
• Apply a spatial query based on polygon size at selected scales to limit the
number of features retrieved to less than 5000.
Ecological Vegetation Classes
Filter Builder
Filter Builder allows user
controlled conditional display
of features in a layer
Cell containing Lignum Swamp EVC
Ecological Vegetation Classes
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Put slide showing EVCs at detailed polygon scale for one of the cells
in the previous slide and include identify window.
Native Vegetation Extent
Challenge:
• Statewide polygon dataset of over 5 million features but few classes.
• Need to show complete dataset at statewide extent.
Approach:
• Static high resolution image of the layer was created for use at all scales
served from IWS and merged into browser by IMF.
• Needed to develop suitable generic map base to support this technique.
• Created simplified source dataset for use at small scales by aggregating
attribute classes, filtering small features and generalising linework.
Native Vegetation Extent
Native Vegetation Extent
Threatened Species
Challenge:
• Point datasets involving hundreds of thousands of individual records.
• Need to show occurrence of species or groups in a broad context.
• Locational accuracy needs to be deliberately blurred for public viewing.
• Widely varying currency and accuracy needs to be visible to expert users.
Threatened Species
Approach:
• Overlay point data on the 10, 5 and 1 minute grids to generate 3
tables with a many to one relationships to the corresponding grid.
• Summarise data so that a record associated with a grid cell represents
a summary of all the recordings of a species for that cell.
• Develop a separate polygon layer to represent point record accuracy.
• Present data as independent sub groups (eg: reptiles) to limit clutter.
• Enhance Filter Builder to work on group of 5 layers as one logical
entity and support multiple filters in effect at same time.
• Devise grid rendering method to reflect variety and quantity of data.
• Add authentication module to restrict access to detailed information.
Threatened Species
Threatened Species
Threatened Species
Threatened Species
Threatened Species
Add in image with point data removed
Threatened Species
Threatened Species
Add in image below 1:30000
Conclusions
• a lot of performance and functional benefits can be gained from
careful consideration of the form in which spatial data is stored and
then rendered in web mapping applications.
• a range of solutions are required to deal with spatial datasets that
have significantly different characteristics.
• web mapping applications provide us with opportunities to
communicate complex spatial information to users in ways not
possible with traditional static maps.
DSE MapShare Sites
DSE MapShare Sites
Internal
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Biodiversity Interactive Map
Crown Land Manager
Recreation Facilities Database
Catchment Information Mapper
Fireplan
Forest Explorer Online
Native Vegetation Tracker
Firemap
Victorian Water Resources
Index of Wetland Condition
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External
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MapShare Functionality
• Zoom in, zoom out and pan around the map covering all of Victoria.
• Control the visibility of spatial data to create a custom map.
• Identify features in the map to display their attributes.
• do queries on related databases (including metadata).
• link (hyperlink) to other data sources (eg: photographs).
• add freehand text and linework to a map as ‘markup’.
• create custom maps as PDF documents from a list of set format options.
• Export data in formats such as excel tables and shapefiles.
MapShare Functionality
Toolbar
Navigation - zoom, pan
Locate and identify features
Markup tools
Measure
Export, print and save
MapShare Functionality
Table of contents
Toggle between layer list
and legend in the key area
MapShare Functionality
Layer functions
Folders - Click to open or close
Layer - may be scale dependent (grey box) - click for metadata
Labels on/off (for some layers)
Zoom to layer scale threshold (for some layers)
MapShare Functionality
Markup function
Markup tools for drawing
shapes or text
MapShare Functionality
Quick views
Find by
location
Select a region
MapShare Functionality
Downloadable layers - only available some sites
MapShare functionality...
Upload your shapefile
(selected sites)
Upload a shapefile to the
current session
Browse for relevant files
Set symbols and order of drawing
Native Vegetation Extent