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UID:pretalx-foss4g-2026-TZK3LW@talks.osgeo.org
DTSTART;TZID=JST:20260901T163000
DTEND;TZID=JST:20260901T170000
DESCRIPTION:Transit accessibility is a crucial component of sustainable urb
 an mobility\, as it directly influences the effectiveness of public transp
 ortation systems. Many cities throughout the world use transit-oriented de
 velopment (TOD) plannings to make it easier to travel to public transporta
 tion like bus and train stations. The goal of TOD policies is to get indiv
 iduals to take public transit instead of private vehicle dependence. Using
  fixed-distance radial buffers to mark the areas surrounding stations wher
 e people can catch the bus or train is a common technique to plan transit.
  TOD plannings often provide guidance in improving first and last mile con
 nectivity by using radial buffers. The distance between these buffers is n
 ormally between 400 and 1500 meters. These buffers are widely used in plan
 ning frameworks and policy recommendations since they are simple to use an
 d understand. Radial buffers are useful\, however they don't necessarily i
 ndicate how easy it is for people to get to locations. \n\nStandard Euclid
 ean radial buffers assume as if people can walk straight from any location
  in the buffer to the station. Cities are a lot more complicated than they
  look. It's often hard for people to move around because of obstacles like
  buildings\, fenced developments\, and other physical barriers. Because of
  this\, the real distance and time it takes to walk to a station can be si
 gnificantly different from what radial buffers suggest they are. This over
 simplification could lead to incorrect estimations of how easy it is to tr
 avel to stations\, misleading representations of area coverage\, and possi
 bly faulty planning decisions in policies that are meant to encourage tran
 sit-oriented development. \n\nThis study therefore presents a GIS-based wa
 lking isochrone that utilizes open-source geospatial data and network anal
 ysis techniques to delineate transit station catchment regions. Walking is
 ochrones show where you can walk to in a specific length of time or distan
 ce on an actual street or pedestrian network. The work employs open-source
  geographic data and GIS tools to generate walking isochrones around desig
 nated rail transit stops. This study locates places that can be accessed w
 ithin 5\, 10\, and 15 minutes of walking by service area analysis via netw
 ork data from OpenStreetMap (OSM). In addition to time-based accessibility
 \, catchments based on walking distances of 400 m\, 800 m\, and 1500 m are
  also studied. This was done using open-source geospatial data as well as 
 open-source tools such as QuickOSM and QNEAT3. The values are in line with
  the planning standards that are typically used for making transit station
 s catchments in TOD guidelines. Following that\, the isochrone polygons ar
 e compared to normal Euclidean radial buffers that are the same distance f
 rom the center. \n\nSeveral spatial indicators are analysed to assess the 
 differences between typical buffer and isochrones. First\, the catchment a
 reas are calculated to determine differences in size between isochrone-bas
 ed service areas and radial buffers. Second\, population are evaluated by 
 estimating the population contained within each catchment area. Third\, th
 e entropy index or diversity of surrounding land uses are examined. Land-u
 se mix indices are calculated to provide a quantitative representation of 
 activity diversity within each catchment area. TOD documents often promote
  land use mix to increase public transportation usage. \n\nThe findings of
  this study indicate significant discrepancies between Euclidean radial bu
 ffers and network-based walking isochrones. Radial buffers tend to overest
 imate the accessible walking area within a given timeframe or distance. Th
 is difference is particularly obvious in urban environments characterized 
 by inefficient street connectivity or physical barriers that hinder direct
  pedestrian movement. Subsequently\, isochrone-derived catchment areas are
  typically smaller and reveal less regular geometries compared to radial b
 uffers. Furthermore\, network-based isochrones provide a more accurate rep
 resentation of the population that can feasibly walk to a given station. T
 he examination of land-use mix also demonstrates that the approach used to
  find the catchment region can change how much land-use variety is found f
 or the station area. Isochrone-based catchments might not include some lan
 d-use zones that are in radial buffers but are cut off by barriers or stre
 et networks that don't connect well. The results have a big impact on how 
 we plan for public transit and how we judge TOD policy. If planners simply
  use radial buffers to figure out station catchments\, they might think th
 at transit infrastructure is simpler to get to than it really is and that 
 public transportation serves a greater population than it really does. \n\
 nThis study not only supplements to the ways that people plan transportati
 on\, but it also shows how helpful open-source geospatial tools and datase
 ts can be. Anyone can use open-source GIS tools and data sources\, which a
 re what the whole process of this study relies on. For instance\, OpenStre
 etMap is utilized to obtain data about road networks\, and GIS-based netwo
 rk analysis is used to create service areas. The Free and Open Source Soft
 ware for Geospatial (FOSS4G) group has goals that are similar to this stud
 y. It supports open\, accessible\, and repeatable geospatial research. Bec
 ause it employs open-source data and analytical methodologies instead of h
 igh-priced software or proprietary datasets\, cities all around the world 
 may replicate this study in their own cities. \n\nAll in all\, this study 
 illustrates how open geospatial systems might enhance advanced spatial ana
 lysis in urban transportation planning. It demonstrates the practical appl
 ication of open data and GIS-based network analysis for evaluating public 
 transit accessibility. Furthermore\, it also reveals how open-source metho
 dologies can enhance the precision of planning assessments. The proposed m
 ethod not only contributes to scholarly discussions regarding the measurem
 ent of transit accessibility but also provides planners\, policymakers\, a
 nd academics seeking to enhance first- and last-mile links in urban transi
 t systems with improved strategies. This study ultimately provides a repli
 cable approach for assessing transit station catchment areas\, grounded in
  open-source geographical data. The results improve the methodological acc
 uracy of transit accessibility studies and help planners make better decis
 ions about sustainable urban transportation and TOD plans.
DTSTAMP:20260717T225733Z
LOCATION:Cosmos2
SUMMARY:GIS-Based Walking Map Isochrones in Measuring Transit Catchment: A 
 Spatial Approach to Urban Accessibility - Maisarah
URL:https://talks.osgeo.org/foss4g-2026/talk/TZK3LW/
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