Online Demo: NYC TaxiFlow (based on ~177 million
taxi trip records in 2009)
1)
Aggregated pickup locations snapped to
2)
Aggregated drop-off locations snapped to
3)
Aggregated pickup locations using 2000 Census
tracts [link]
4)
Aggregated drop-off locations using 2000 Census
tracts [link]
Notes:
A)
All symbolized values are based on 10-level
natural-break classification of the TOT field in
the respective dataset.
B)
Fields H0 to H23 denote
the hourly values from hour 0 to hour 23 in a day.
Charting function will be provided in the next
version.
5)
Visualizing taxiflow
among 71 NYC Community Districts (2009) using JFlowMap
(applet-based)
Hourly:
[FlowMap
View] [FlowStrates
View]
Aggregated:
[FlowMap
View] [FlowStrates
View]
6)
Visualizing top 1000 TaxiFlow
pairs (2009) using JFlowMap
(applet-based)
Hourly:
[FlowMap
View] [FlowStrates
View]
Note:
when an applet is loaded in FlowMap view, click
the [Settings] button to bring a setting dialog.
Click the [animation] tab to play the hourly
animation of taxi trip counts of the top 1000
pairs (408 census blocks).
LGA case study of NYC TaxiFlow
Using
bctcb2000 code 40331001001 in NYC
Census Tract 2000 dataset with 101,499
(out of ~200 millions) taxi trips in 2009.
1)
Locations: Low
Resolution [Pickup
Locations] [Drop-Off
Locations] High
Resolution [Pickup
Locations] [Drop-Off
Locations]
2)
Google Map of the Study Area: [Image]
3)
Hourly trip distributions: [Link]
4)
Charting: [Distance-Time]
[Distance
- Fare] [Time
-
Fare] [Fare
-
Tip]
Note:
Charting uses the first 32,000 samples due to
Microsoft Excel Limits.
Shortest-Path Based
Trip Counts over
Online Demo: Visual Exploration of
Large-Scale Species Distribution Data
URL
http://geoteci.engr.ccny.cuny.edu/birds30s/BirdsQuest.html
Related Publication:
1.
Jianting Zhang (2012). A
high-performance web-based information system for
publishing large-scale species range maps in
support of biodiversity studies. Ecological
Informatics 8: 68-77. [Link][Local
Copy]
2.
Jianting
Zhang,
Michael Gertz, Le Gruenwald, Efficiently Managing
Large-Scale Raster Species Distribution Data in
PostgreSQL. Proceedings of
ACM-GIS09, Nov. 4-6,
3. Jianting
Zhang,
Efficiently managing large
scale species range maps in
a spatial database
environment, Proceedings of
17th
International Conference on
GeoInformatics, Aug 12-14,
2009,
Online Demo: Visual Exploration of
Large-Scale Geospatial Rasters
URL:
http://geoteci.engr.ccny.cuny.edu/rasterexplorer/comgeotiling/TestOverlay.html
Related Publications
1. Jianting Zhang and Simin You. Supporting
Web-based Visual Exploration of Large-Scale
Raster Geospatial Data Using Binned Min-Max
Quadtree. Proceedings
of the 22nd International Scientific
and Statistical Database Management Conference
(SSDBM10). June
30-July 2 2010,
2.
Jianting
Zhang
and Simin You. Dynamic Tiled Map
Services: Supporting Query-Based Visualization of
Large-Scale Raster Geospatial Data. Proceedings of the 1st
International Conference on Computing for
Geospatial Research & Application
(COM.Geo10). June
21-23,
Open Source Software: VD-RS [snapshots]
URL: http://geoteci.engr.ccny.cuny.edu/pub/vdmrsv10.zip (11M)
Related Publications
1. Jianting Zhang, Le Gruenwald, Michael Gertz, VDM-RS: A Visual Data Mining System for Exploring and Classifying Remotely Sensed Images. Computers & Geosciences 35(9), 1827-1836. [doi:10.1016/j.cageo.2009.02.006]. ISSN 0098-3004. [Link][Local Copy]
2.
Jianting
Zhang,
Le Gruenwald, Opening the Black Box of Feature
Extraction: Incorporating Visualization into
High-Dimensional Data Mining Processes.
Proceedings of the IEEE
International Conference on Data Mining (ICDM06),
Open Source Software: LEEASP [snapshots]
URL: http://geoteci.engr.ccny.cuny.edu/pub/LEEASPV10.zip (7M)
Related Publications
Jianting Zhang, Le Gruenwald, 2008. Embedding and Extending GIS for
Exploratory Analysis of Large-Scale Species
Distribution Data. Proceedings of
ACM-GIS'08, November 5-7.
Open Source Software: GBD-Explorer [snapshots]
URL: http://geoteci.engr.ccny.cuny.edu/pub/GBDV10.zip (55M)
Related Publications
Jianting Zhang, Deana D. Pennington, Xianhua Liu, 2007. GBD-Explorer: Extending Open Source Java GIS for Exploring Ecoregion-Based Biodiversity Data. Ecological Informatics Journal, 2(2), pp. 94-102. ISSN: 1574-9541. (doi:10.1016/j.ecoinf.2007.05.001)