If resolution is too thin, processing time can be Of great diversity areas and reduce redundancy in almost plain These values must be carefully chosen to permit representation Grid parameters are resolutions in X and Y directions. Generation of grid is necessary when sample locationsĪre different from facets vertices. Same locations of the samples, but this seldom happens. Facets vertices canīe the sample points if the vertices are defined exactly on the Rectangular regular grid is a digital model thatĪpproaches surfaces by a rectangular facets. Contour lines and their values must be identifiedĪutomatically and the line is vectored, generating points sequence. Scanner method requires scanning of the map toĪ image format.
Define digital terrain model manual#
Manual method consists in identifying a contour.Contour maps digitizing can be done by usingĭigitizer in a manual method or by a scanning method. Regularly and irregularly spaced data are acquiredīy reading files. Of stereoscopic photographs and GPS data. Process uses available maps digitizing, quantitative measurements Phenomenon data are usually collected by a irregularĭistribution over XY plane or through regular spacing. Of that value over a bidimensional space. Z value is the value of interest phenomenon, XY define the location Terrain model data are presented by XYZ coordinates. Digital terrain modeling process has three phases:ĭata acquisition, grid generation and information extraction from.Points are connected throughĪ grid and they can be regularly spaced or can be scattered. Generate forms with a very high degree of smoothness and are notĪdequate for terrain representation. Geomorphologic studies and estimate erosion and run-off.ĭigital model can be represented by mathematicallyĭefined surfaces or by connected points. Computing of slope and aspect maps to assist.Planning of roads routes and dams location.Training and landscape design and planning
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