organisation	MLURI
user_name	David Miller
user_organisation	Macaulay Land Use Research Institute Craigiebuckler Aberdeen AB15 8QH
date	16/07/97
data_set_name	basuk watershed plus 1km
data_date	June 1997
description	A vector dataset of the catchment boundary of the BASUK study site. The derived watershed has been buffered by 1km to ensure that all other datasets are described and assessed with respect to the entire catchment and that there are no gaps due to misregistration, errors in boundary delimitation or issues associated with using large pixel resolutions (such AVHRR).
raster_vector	VECTOR
filename	basuk_sh_1km
software	ArcInfo GRID (Ver. 7) - algorithms to derive the watershed. In-house software (Fortran) for uncertainty assessments of watershed with respect to the DEM. No information is available on the algorithm used to derive the OS raster DEM.
formats	Erdas Imagine (*.img and *.lan) ArcInfo Grid
operating_system	Solaris 2.4 and 2.5
format	Erdas Imagine Version 8.2 (*.img)
projection	Modified Transverse Mercator Airy spheroid (1838) Central meridian: 2 degrees west scale factor at central meridian: 0.9996 Latitude of origin 49 degrees north False Eastings: 400000m False Northings: 100000m
data_quality	YES
resolution	50m x 50m Derived from Ordnance Survey 1:50 000 maps with a contour Vertical imterval of 10m.
attributes	1 = inside catchment 2 = within 1km buffer outside of catchment boundary
methods
other	The quality of the dataset is dependent upon the quality of the input OS DEM. Reporting on the DEM OS indicate an RMSE of 3m in the uplands. A study of an area to the east of the BASUK shows errors of RMS 7m. Therefore, the boundary should be treated with caution particularly where the watershed is not distinct and there are low slopes running away into the adjacent catchments. (accuracy statement - pending)
copyright	Macaulay Land Use Research Institute, Aberdeen. Copyright for the original DEM is Crown Copyright, Ordnance Survey, Southampton.
contact	Dr David Miller Macaulay Land Use Research Institute Craigiebuckler Aberdeen Ab15 8QH Tel: +44 1224 318611 x 2240 Fax: +44 124 311556 Email: d,miller@macaulay.ac.uk