Trendy rozwoju rozproszonych systemów GIS. Andrzej Chybicki. Rozproszone systemy GIS – trendy rozwoju. Standaryzacja Metadane Web-based GIS Dissemination Rozproszenie w akwizycji danych INSPIRE Urządzenia mobilne Augmented reality LBS. AR - Geneza.
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Trendy rozwoju rozproszonych systemów GIS
Milgram and Kishino 1994; Milgram, Takemura et al. 1994
All points in the system are represented in an affine reference frame. This reference frame is defined by 4 non-coplanar points, p0 ... p3. The origin is taken as p0 and the affine basis points are defined by p1, p2 and p3. The origin, p0 is assigned homogeneous affine [0 0 0 1]T coordinates and basis points, p1, p2, p3 are assigned affine coordinates of [1 0 0 1]T, [0 1 0 1]T, [0 0 1 1]T respectively. The associated affine basis vectors are p1 = [1 0 0 0]T, p2 = [0 1 0 0]T, and p3 = [0 0 1 0]T. Any other point, px, is represented as px = xp1 + yp2 + zp3 + p0 where [x y z 1]T are the homogeneous affine coordinates for the point.
[X Y Z 1]T are the homogeneous coordinates for a virtual point and [u v 1]T are its projection in the graphics image plane, the projection process can be expressed as:
O3x4 is the homogeneous transformation from virtual object coordinates to world coordinates, C4x4 is the transformation from world coordinates to graphics camera coordinates and P4x4
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