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4.2 Creation of Longitudinal Sections
This "four-dimensional" watercourse network is then used to generate site plans — including the route-measured
watercourse system - and longitudinal sections. The geometry of the sections results from the station and elevation data
of the respective periods to be illustrated. Any number of period combinations of floor and terrain slope edges can be
combined. The illustration of the correct location of floor and corresponding terrain slope edges is ensured by the triple
points described in Chapter 4.1. As a rule, the length of the floor corresponds with the allocated station, whilst the
terrain slope edges are illustrated as either shortened or extended. The sections are also accompanied by details about
special punctiform and linear features (e.g. pipelines) as well as any further information (e.g. origin of the data) from
event tables in the appendix. These longitudinal sections form the basis for the assessment of water flow changes
resulting from underground extraction and for the planning of appropriate measures.
FACH ERICH EC rms
dint hy HME = Ed 2 3 * x & = 5 * * E
i E: 4 i = à 2 3 3 3 3x = = 8
Ze (CF EP as ; 54 us da xd x rr EI. xam 335 eg E AR
& E die
d p
ocsiuoy: ks oi
9
um 1.
5:
ES
ad
ES
4
Sos PEG E XU ER RAR ans xw xem
Essen seau ir: BRR
Faraataiote (nik Ligericis
m ^ i 5 - > 2 Sw =
ds x à à à # à s & # € sS E # i
Starter
= 5 i
SSbondizrssmer Tred
> m
= 8 m S
Figure 7. Longitudinal Section of a Watercourse
(situation in 1997: black, in 2000: yellow, in 2020: red)
43 Creation of Thematic Watercourse Maps
Special applications are used to build standardised databases which are linked to the watercourse network in the form of
further event tables, enabling a description of the ecological status of the rivers and streams. This is then assessed and —
taking changes in flow and isobath ground-water table into account — the impacts are forecasted, and the results are
linked to the watercourse network in further event tables.
This data basis, combined with the implementation of specially developed methods, produces high quality cartographic
illustrations of the results for the environmental compatibility studies, in the form of status maps, assessment maps and
forecast maps. These watercourse maps are created with AML programming, using the standard ArcPlot facilities. To
emphasize the most important information, the maps are opaque with appropriate overposts. To illustrate more than one
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 219
