I am looking at applying a direction indicator to land parcels and houses (in MasterMap).

Effectively, I am looking at applying a direction indicator to the land and the buildings associated to the land (NW-SE, N-S, E-W etc). Is there an easy way to do this?

I guess you'd need to also find the direction of the road it was situated on for completeness?

  • 2
    Would you mind explaining what a "direction indicator" might be?
    – whuber
    Apr 8, 2011 at 15:51
  • For users outside the UK - MasterMap is a product from Ordnance Survey - ordnancesurvey.co.uk/oswebsite/products/os-mastermap/…
    – Mapperz
    Apr 8, 2011 at 16:17
  • @whuber What I mean by this, is its aspect, as such, which way does the front and rear of the property face; is it NE-SW lying, etc.
    – Hairy
    Apr 11, 2011 at 12:29

1 Answer 1


ITN (Integrated Transport Network) has line direction for the ROADS


but for houses/land parcels there is no way - you can add an arrow direction to the digitised line but that will only be the direction the operator drew the original linework to make the parcel polygon.

possible workaround: create a centroid of the parcel and apply a direction arrow to that?

This can be done in ArcGIS Calculate Polygon Main Angle (Cartography)

Calculates the dominant angles of input polygon features and assigns the values to a specified field in the feature class


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