Mapping accessibility on the WWU campus  

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•  In order to represent accessibility information digitally, we have to break down the real-life environment into its discrete features (objects, elements) :

-  Stairs -  Ramps -  Corridors, etc.

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•  Each object has a set of properties (attributes) describing it from the viewpoint of accessibility:

- eg. a ramp has a particular slope (inclination) and width that make it (in)accessible for a wheelchair user

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Outdoor objects and accessibility attributes  

Outdoor Object Attributes

Ramps Width Inclination Handrail Manoeuvring Space

Steps Lighting Coloured Markings

Tread Depth Handrail

Pathways Surface Inclination

Parking Space Number of Places for Wheelchair

Distance to Entrance

Building Wheelchair Accessible

Width Automatic Opening/Closing

Bell / Intercom

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Indoor objects and accessibility attributes

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Description sheets for each type of object – outdoor or indoor

retrieved  from  OpenStreetMap  /    indoor  mapping  app  

                     a8ributes          

a8ribute  value  

-­‐   after creating (or finding) a digital element to represent a real-life object, make note of its ID as well as values for its attributes

element  ID   a8ribute  values  can  be  numbers  or  sets  of  predefined  opBons  (eg.  good/poor/none):  see  file  “Kriterien”  for  possible  values)    6  

Objects in OpenStreetMap (OSM)

• OSM lets us create digital representations of outdoor objects

• Real-life objects are represented in OSM by using geometric elements:

- points (known as ‘nodes’ in OSM) - lines (‘ways’), and - areas (‘closed ways’) •  Each element can be described (‘tagged’)

to store info about attributes of the represented object

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OSM on smartphones

•  http://wiki.openstreetmap.org/wiki/Go_Map!!

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Desktop OSM: JOSM

•  1. Download current map data from OpenStreetMap

•  2. Edit map elements using satellite imagery, GPS, field papers and notes as well as using our knowledge of a place

•  3. Save changes to OpenStreetMap

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Nodes in OSM

• Nodes in OSM are point elements. •  They define a single geospatial point,

using a latitude and longitude.

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Ways in OSM

• Way is a general term for a series of joined nodes.

•  They usually represent linear objects (vectors), such as rivers or roads.

• Ways can also represent solid polygons (areas), such as buildings or forests. In this case, an area is a way whose first and last node are the same – a closed way.

• Closed ways occasionally represent linear loops, such as highway roundabouts, rather than solid ('filled') areas.

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Tags in OSM •  All elements have tags that describe the

objects that the elements represent in more detail.

•  Tags are organized into keys and values. The general form of a tag is key=value.

•  Keys are categories of object properties, such as Land Use for a closed way representing a plot.

•  Values specify keys, eg. Land Use=Garden

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Example: representing steps (and ramps) in OSM

•  After entering a line (‘way’ in OSM) to represent the steps, we need to tag it appropriately:

•  highway=steps: “highway“ is a key describing what kind of linear element the way is

•  incline=20%: “incline” is a key to store the slope

•  ramp=yes: if the way represents a ramp rather than steps, this tag is needed

•  handrail=yes: is there a handrail? •  etc.

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Tags in OSM  •  There are numerous tags available –

check the links for a description of what different keys and values mean

- https://www.openstreetmap.org/login?referer= %2F

- http://learnosm.org/en/beginner/start-osm/

•  To store accessibility information, we can use some of the available tags; eg. width=120cm

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Accessibility-related OSM tags  Outdoor  Object     A-ributes    

Ramps  highway=steps  ramp=yes    

Width    width=*    

InclinaBon    incline=*    

Handrail    handrail=yes/no    

Manoeuvring  Space    

Steps      highway=steps    

LighBng     Coloured  Markings    

Tread  Depth     Handrail    handrail=yes/no    

Pathways    highway=””    

Surface      surface=””    

InclinaBon    incline=*    

• means  that  the  value  for  the  key  has  to  be  numerical  

“”  means  that  the  value  for  the  key  is  a  string  of  characters    

Parking  Space    amenity=parking    

Number  of  Places  for  Wheelchair  capacity:disabled=  yes/no/number    

Distance  to  Entrance    

Building    building=entrance    

Wheelchair  Accessible    wheelchair=yes/limited/no    

Width    width=*  

AutomaBc  Opening/Closing    

Bell  /  Intercom    

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• What about accessibility attributes for which keys are not already available in OSM?

• Use description=“” tag, eg. decription=manoeuvring space available •  In any case, adding tags in OSM is

welcome but optional: all accessibility attributes should be entered in description sheets (slide 6)!

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Indoor Mapping Application by Georg Tschor  

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Choose source

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Create elements: corridor and room

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Create elements: door and entrance

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Create elements: vertical connection

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Upload and edit

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Thank you and have fun!

• Contact us for any questions and doubts: •  Elisabet Adeva: e_adev01@uni-muenster.de • Nemanja Kostic:

kostic_nemanja@yahoo.com

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