organisation	UBE
user_name	Stefan Voigt
user_organisation	Stefan Voigt, UBE Department of Geography University of Berne Hallerstr. 12 CH - 3012 Berne, Switzerland Tel: +41 (0)31 631 8552 Fax: - 8511 e-mail: voigt@giub.unibe.ch
date	20.01.1998
data_set_name	rhi_lake
data_date	1992
description	subset for BASCH of a vector data set containing hydrological features such as rivers and lakes along with various attributes. the data are supplied by the Federal Statistical Office of Switzerland. the layer is a thematic subset of the "rhi_river" set.
raster_vector	VECTOR
filename	rhi_lake
software	ArcInfo / ArcView
formats	ArcView shape file
operating_system	NT / UNIX
format	ArcInfo POLYGON Coverage
projection	Oblique Mercator Swiss Datum (CH-1903) Bessel Ellipsoid 1841 central point: 7 26 22.50 (longitude) 46 57 08.66 (latitude) 560.00 (meter) azimuth: 90° false easting: 600,000 false northing: 200,000
data_quality	YES
resolution	map scale derived from 1:200,000
attributes	specific hydrological attributes only: BUWAL_BWW Official Classification (FFFF) ABSCHNITT Section Code 1:2,000,000 (AAA) NAME Name of river/lake derived from cadastral or topo map 1:25,000 with an " added in front NAME2 Second name derived from topo map 1:25,000 CODE 200 FFFFAAAA TYPE 0 rivers 1 parallel section 2 lake shore 3 virtual section in lake (lake traverse) 4 channelled river 5 karst 6 seeped away 7 artificial lake 8 island KM_START lower end of section KM_END upper end of section K500 flag in maps 1:500,000 (0/1) K1000 flag in maps 1:1,000,000 (0/1) DOWNNORMAL next lower section (identical BUWAL No.) DOWNPARALLEL lower parallel section (identical BUWAL No.) UPNORMAL next upper section (identical BUWAL No.) UPPARALLEL upper parallel section (identical BUWAL No.) UPNEU next upper section (different BUWAL No.) UPSEENEU next upper lake section (different BUWAL No.) BREITE classes of optical width 1 - 10 general 11 - 20 artificial rivers/lakes 81 - 90 outside of Switzerland 91 lake shore Klasse width 91 (lake shores; few exceptions) width 91 (islands) width 4,14,84 width 5,15,85 width 6,16,86 width 7,17,87 width 8,18,88 width 9,19,89 width 10,20,90
methods	General: The data derivation was subdivided into four different steps: 1. Derivation of the geometry of the hydrological features by scanning Swiss hydrological maps with a scale of 1:200,000 with 600 dpi 2. Adding structural information to the hydrological features, such as: flow direction,lake attributes, bifurcation etc. 3.Encoding of rivers and lakes with name and official codes 4. Visual interpretation of width, water runoff and importance of rivers SELECTION OF LAKES: The polylines of the layer "rhi_river" with the attribute TYPE = 2 or 7 (shore line and artificial lake) were selected and transformed to an new polygon coverage using the ArcInfo Commands: SELECT, PUT, BUILD, ADD and JOINITEM
other	non
copyright	licensed for UBE
contact	Stefan Voigt, UBE Department of Geography University of Berne Hallerstr. 12 CH - 3012 Berne, Switzerland Tel: +41 (0)31 631 8552 Fax: - 8511 e-mail: voigt@giub.unibe.ch