8. SUMMARY
Flexible, accurate, fast and rigorous methods were developed
on the basis of the SCOP DEM data structure in order to
combine and to intersect different types of surface data. The
methods were made available for a practical use by the
program SCOP.INTERSECT.
In addition to the applications described in this paper there are
many similar other ones possible. They cover a wide field
ranging from projects which are closely connected with digital
elevation models to projects which only make use of the DEM
data structure as a data basis for polygon overlays.
A summary of the methods and applications is given in table 1.
This example shows that a DEM program can no longer be
seen as a stand-alone system. Today's methods are carefully
designed to be of general use, e.g. in geographic information
systems.
REFERENCES:
Ackermann,F., 1991. High-quality digital terrain models - The
SCOP program and derived products. Proceedings of the
EARSEL workshop on relationship of remote sensing and
geographic information systems, Hannover.
Kóstli,A., Sigle,M., 1986. The random access data structure of
the DTM program SCOP. Int. Arch. Photogramm. Remote
Sensing, vol.26, part 4, pp.45-52, Edinburgh.
Kóstli,A., Wild,E., 1984, Digital elevation model featuring
varying grid size. Int. Arch. Photogramm. Remote
Sensing, vol.25, part 3, Rio de Janeiro.
Kraus,K., Assmus,E., Kóstli,A., Molnar,L., Wild,E., 1982,
Digital elevation models: users' aspects. Proc. 38% Photo-
grammetric Week 1981, pp.165-181, Stuttgart.
Sigle,M., 1991, Die Erstellung von Bodenerosionsgefähr-
dungskarten auf der Basis eines digitalen Geländemodells.
GIS, Jahrgang 4, Heft 4/1991, pp.2-7, Karlsruhe.
Wischmeier,W.H., Smith,D.D., 1978, Predicting rainfall
erosion losses - a guide to conservation planning. USDA
Agricultural Handbook No. 37, Washington.
Application:
volume
computation
slope statistics
integration of
planned terrain
soil loss
prediction
polygon overlays
1. DEM combination
input model 1 DEM 1 DEM (existing) slope model
input model 2 DEM 2 DEM (planned) erodability model
function subtraction boolean function USLE
functional model
Y
difference model
v
combined DEM
Y
slope-length model
follow-up products
difference maps
perspective views
soil erosion maps
2. DEM intersection
SCOP model
difference model
slope model
soil value model
polygon areas
earthwork areas
pieces of land
pieces of land
class limits
height difference 0
slope classes
soil value classes
intersection result
v
volumes for
cutting and filling
Y
areas of slope
classes
v
areas of soil
value classes
Table 1: Summary of methods and applications
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