Reach scale experiments have shown that transient storage (TS) zones may be important controls on nitrogen (N) export to coastal waters. We investigated the relative impact that main channel (MC), surface TS (STS) and hyporheic TS (HTS) have on N removal at the network scale using an N removal model applied to the Ipswich River in Massachusetts, USA.

The town of Ipswich, Massachusetts in the Ipswich river watershed was mapped at the sub-parcel scale using object-based image analysis. Look at the map's inset for detail. Individual objects such as houses, trees, and shrubs are mapped using 45cm 4-band aerial photography to describe the contents of tens of thousands of parcels in the Ipswich and Parker river watersheds of Massachusetts. Virtual globes are used to determine the extent to which the methodology has properly classified the imagery.
 

Sub-parcel land-cover can be mapped for large spatial extents with a measured accuracy using object-based image analysis. Individual objects such as houses, trees, and shrubs are mapped using 45cm 4-band aerial photography to describe the contents of tens of thousands of parcels in the Ipswich and Parker river watersheds of Massachusetts. Virtual globes are used to determine the extent to which the methodology has properly classified the imagery