As in most applications, ‘modeling is as good as the
data get’. The key to quality travel time estimation is the
network data. The following uses a study area in East
Baton Rouge Parish of Louisiana (Figure 4) to examine
how the results by ArcGIS and Google Maps API differ.
Parish is the county unit in Louisiana. The study area is
simply referred to as Baton Rouge hereafter. The network
data used by ArcGIS are extracted from the data DVDs
that came with the ArcGIS 10.0 release, more specifically,
StreetMap North America. The road network data
are based on the TomTom (TeleAtlas) 2005 version 7.2 data
(according to personal communication with James Shimota
of ESRI on 28 June 2011). On the other side, data used
in the Google Maps are fairly updated. Most of this study
was conducted in the summer of 2011. In the case study
reported here, we used the data generated by the Google
Maps API tool on 8 June 2011.
In comparison to the ArcGIS Network Analyst
approach, at least four advantages are identified in using
the Google Maps API. Note that our discussion below
is limited to our experiment of using the aforementioned
dataset in ArcGIS 10.0. It does not apply to one with access
to more recent and extensive datasets such as those from
TeleAtlas (www.teleatlas.com) that contain data of ‘speed
profiles’ to capture congestion effects
As in most applications, ‘modeling is as good as the
data get’. The key to quality travel time estimation is the
network data. The following uses a study area in East
Baton Rouge Parish of Louisiana (Figure 4) to examine
how the results by ArcGIS and Google Maps API differ.
Parish is the county unit in Louisiana. The study area is
simply referred to as Baton Rouge hereafter. The network
data used by ArcGIS are extracted from the data DVDs
that came with the ArcGIS 10.0 release, more specifically,
StreetMap North America. The road network data
are based on the TomTom (TeleAtlas) 2005 version 7.2 data
(according to personal communication with James Shimota
of ESRI on 28 June 2011). On the other side, data used
in the Google Maps are fairly updated. Most of this study
was conducted in the summer of 2011. In the case study
reported here, we used the data generated by the Google
Maps API tool on 8 June 2011.
In comparison to the ArcGIS Network Analyst
approach, at least four advantages are identified in using
the Google Maps API. Note that our discussion below
is limited to our experiment of using the aforementioned
dataset in ArcGIS 10.0. It does not apply to one with access
to more recent and extensive datasets such as those from
TeleAtlas (www.teleatlas.com) that contain data of ‘speed
profiles’ to capture congestion effects
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