Download - Usability in the GeoWeb
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Why Web Design Firms can Eat Your
Lunch
Dave Bouwman / Data Transfer Solutions / http://blog.davebouwman.net
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of
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aregeo-geeks
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weknow
spatialdata
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analyzedata
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createimpressive
maps
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and all was good…
until…
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yourmanager
sent a memo…
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Era of“WebGIS”
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stuff
“GIS” in a
browser
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Cram desktop intoA browser
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a lottolearn
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Web Managernewapplications
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customizationmeant…
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Same toolsSame workflowsSame terminologyWorse performance
WebGIS Lesson Plan
1. Object Oriented Programming2. VB.NET / C# / Java3. Intro to HTML and CSS4. ESRI WebADF 5. Webservices 101
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beforelong…
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XHTMLCSS
Javascript
.NET
Visual Studio
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Screen shot of CDOT
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about your lunch…
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what if we were web developers
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wehow
see“WebGIS”?
would
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most“WebGIS”
sitesare…
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“Data”
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“Tools”
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interface
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“Tasks”
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“Analysis”
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analysismarket
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Co
st
Co
mp
lex
Usa
bili
ty
Val
ue
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expectations:
budgets: high
low
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Co
st
Usa
bili
ty
Val
ue
Co
mp
lexi
ty
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opportunitymeans
“WebGIS”
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and right about this time…
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yourmanager
sends anothermemo…
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GeoWeb
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two dot oh
GIS meets…
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address
businessin a
browser
problems
spatial
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publish&
servicesconsume
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moreto learn
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Same toolsSame workflowsSame terminologyWorse performance
Todays Lesson Plan
1. Object Oriented Javascript2. Ajax: GETting and POSTing3. Intro to JQuery and Dojo4. Designing RESTful services5. JSON and JSONP6. CSS and browser tweaks7. Designing for social the social web
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moretools
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&FireBug
Aptana
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howdo we
tacklethis?
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protect
lunch?your
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we
accept…must
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we
understand…must
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usability
featurestrumps
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we
master…must
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XHTMLCSS Ajax
JavascriptRSS
XML
.NET
JSONREST
TDD
WMS
WFS
GeoRSS
Atom
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userslove…
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users want…
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Same toolsSame workflowsSame terminologyWorse performance
Project Overview
•Global Bird Flu Database •Spatial Module in a CMS•Complex Data Model
• 2000 Tables• >10,000 Stored Procedures
•Virtual Earth + Dojo Toolkit UI
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Example 2
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Same toolsSame workflowsSame terminologyWorse performance
Project Overview
•Roadway Project Management•Workflow Application•SAP Back-end•Dojo Toolkit UI•OpenLayers + WMS
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realperformance
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Get Extent
Get Points
Return to Browser
Cluster
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>50,000
As Points As X,Y’s in a TableArcSDE + AGS: > 5 seconds Tabular Query: 0.3 seconds
*Supports complex queriesSQL2008: ~ 2 seconds
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{"ClusteredPointLocationIds":[34480,34355,34354],"PointLocationId":34480,"IsClustered":true,Location":{"Lat":-2.15,"Lon":-80.53}
}
JSON:custom = fast
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geo-geeks
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pushpins?
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perceivedperformance
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activityindicators
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SAP Get Project List
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feedback…
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what’sshould
I do?
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handle
“null-case”the
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Focused Tools
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I only want to see the data for Calidris alpina, in Turkey, between 1998 and 2008
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generic tool could
work…
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automaticvalidation
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pre-validate
possiblewhenever
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validate
possibleas soon as
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SAP Ref Selection
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mapworkflow
the
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debug
paperon
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stopscope-creep
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releaseearly
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releaseoften
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ProjectBacklog
IterationBacklog
Iteration2 Weeks
Product
iterativedevelopment
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receivefeedback
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Same toolsSame workflowsSame terminologyWorse performance
Zen of Usability
•Faster = Better•Lean on the wire•Use what works•Take small bites•Provide Feedback•Pit of Success•Design & Validate Usability
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Summary:
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kung-fu: needed
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performance is critical
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focus on usability
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nobody can touch yourlunch