![]() The Outflow grid has been modified from the raw output of flow direction algorithms to enforce the "correct" direction of flow based on other sources of knowledge aside from the adjacent eight cells in the Elevation grid itself. The Outflow grid was developed from the Elevation grid but with substantial modification to ensure hydrological consistency. Extensive work has been done to ensure that the hydrological behaviour that will be predicted by running models on this DTM correspond as far as possible with reality. This is a hydrologically consistent DTM providing height in units of 10cms. The IHDTM is comprised of five separate gridded datasets which can be licensed together or separately.Įlevation (height), Outflow and Inflow drainage directions, Cumulative Catchment Area and Surface Type.Įach IHDTM grid is hydrologically consistent with the other IHDTM grids and with the CEH 1:50,000 Watercourse Network dataset. This is a 50m grid interval digital terrain model (DTM) derived from 1:50,000 scale mapping from Ordnance Survey and Land & Property Services (previously OSNI).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |