Petter Pilesjö
Professor
An integrated raster-tin surface flow algorithm
Författare
Redaktör
- Qiming Zhou
- Guo-an Tang
- Brian Lees
Summary, in English
In this chapter, an alternative surface flow algorithm is presented. The basic idea behind the algorithm is the use of the advantages of TIN-based algorithms within a raster based environment. A gridded raster DEM is used to create a ‘regular TIN’, over which surface flow is estimated. Since each facet in the TIN has a constant slope and slope direction, the estimations of, for example, flow velocity and diversion/convergence are less complicated compared to traditional ‘cell based’ solutions. The flow is treated as ‘water packages’, given specific (point) positions on the surface. The number of water packages per cell is initially set to eight, but this number can be increased or decreased. After each time step, the water packages have moved a certain distance (depending on slope and water depth), and new water packages have been created due to precipitation. In order to keep the number of water packages constant (to reduce memory and computer time), all water packages within a TIN facet are merged after each iteration. Parameters in time and space, e.g. precipitation, infiltration, vegetation and elevation, can all be loaded into the software.
Avdelning/ar
- Centrum för geografiska informationssystem (GIS-centrum)
Publiceringsår
2008
Språk
Engelska
Sidor
237-255
Publikation/Tidskrift/Serie
Lecture Notes in Geoinformation and Cartography
Issue
199049
Dokumenttyp
Del av eller Kapitel i bok
Förlag
Springer Science and Business Media B.V.
Ämne
- Remote Sensing
- Physical Geography
Nyckelord
- DEM
- Hydrological modelling
- Surface flow
- TIN
- Topographical modelling
Conference name
Conference on Terrain Analysis and Digital Terrain Modelling, 2006
Conference date
2006-11-23 - 2006-11-25
Conference place
Nanjing, China
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1863-2351
- ISSN: 1863-2246
- ISBN: 9783540778004
- ISBN: 9783540777991