

	LAEI 2008 grids: 1 km grid squares with unique reference number
	LAEI 2010 exact-cut grids: The 1 km squares have been cut at borough and central London boundaries in order for more precise borough totals to be calculated.
	Passenger Shipping Network: New to the LAEI 2010. The link network that passenger shipping emissions have been assigned too
	Rail Network: The diesel rail network

Due to licensing restrictions it has not been possible to provide the selection of major road links from the OS MasterMap Integrated Transport Network (ITN)  that form the LAEI road network. 
All link  level traffic flows and emissions have been assigned to a unique TOID from the ITN. The metadata that accompanied the version of the ITN used to create the new LAEI network is as follows:
Filename:         15492003-MM-itn.gml.gz
Extent:           474987.0, 117345.0 - 588782.0, 223718.0
Date Ordered:     20 March 2012 at 15:49:43
Date of Database: 22 June 2011 at 18:30:00
Layer:            OS MasterMap ITN Layer
