dealing with the data deluge: effectively using npmrds dr. christopher upchurch wichita area...
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Dealing with the data deluge: Effectively
using NPMRDSDr. Christopher Upchurch
Wichita Area Metropolitan Planning Organization
How many of you have heard of
NPMRDS?
How many have downloaded NPMRDS data and looked at it?
How many of you have done something with NPMRDS data?
What is NPMRDS?
NationalPerformanceManagementResearchDataSet
What is NPMRDS?
• Travel time data for road segments• 5 minute increments
• Covers the National Highway System
What is NPMRDS?
• Based on vehicle probe data• Gathered from cellphones and in-vehicle navigation
systems
• Goes back to 2011• 2011 and later for freeways• 2013 and later for surface streets
• Data from HERE• Provided to states and MPOs by FHWA
What is NPMRDS?
• Raw Data• No post processing
• Not provided with any tools
Getting NPMRDS Data
• Email HERE to get an account set up• Must be an elgible agency (state DOT or MPO)
• Log into the HERE portal
Getting NPMRDS Data
Getting NPMRDS Data
Getting NPMRDS Data
Getting NPMRDS Data
Getting NPMRDS Data
Opening NPMRDS
Opening NPMRDS
• Microsoft Access• Database Server• Write your own software
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
NPMRDS Data
TMC DATE EPOCHTravel_TIME_ALL_VEHICLES
Travel_TIME_PASSENGER_VEHICLES
Travel_TIME_FREIGHT_TRUCKS
119N04404 8272015 114 50 49 58119N04404 8262015 217 59 59119N04404 8262015 160 50 49 58119N04404 8262015 103 57 55 65119N04404 8262015 46 62 62119N04404 8252015 206 65 65
Cutting NPMRDS Data Down to Size• Most of us are not interested in an entire state
Cutting NPMRDS DataDown to Size
Cutting NPMRDS DataDown to Size• Get a list of the TMC codes inside the MPO
boundary• Throw away everything that doesn’t have one of
those TMC codes
Caveats with NPMRDS Data• Has not been post processed• Outliers• Missing data
Caveats with NPMRDS Data• Outliers• Anomolously high or low travel times
• Addressing outliers• Remove or adjust anomalous travel times• Use percentile based metrics
Caveats with NPMRDS Data• Does not have travel times for all epochs• More likely to have times for:• Higher volume roadways• Peak periods
• Measures that require speeds on multiple segments in the same epoch can be problematic
Caveats with NPMRDS Data• Addressing missing data• Fill in data using surrounding values• Ignore missing data• Use system level metrics
Using NPMRDS
• WAMPO's Current Uses• Planning Time Index (PTI) – MTP Performance Measure• Travel Time Index (TTI)• Buffer Time Index
• Future Uses• Bottleneck area studies
