Appeal No. 1997-1577 Page 9
Application No. 07/941,466
display, we find that a non-real-world database is created as
the visual display no longer represents the real-world map
data. Thus, the prior art teaches that one can display real-
world and non-real-world features on a display. Moreover, we
find that Dawson discloses (col. 5, lines 24-26) that “[o]ther
features such as roads, railroads, and rivers may be embedded
in the terrain data structure” (underlining added). While we
find that Seki also teaches the use of a data structure
(Figure 4a) in a topographical processing system, we find this
to be cumulative of the terrain data structure of Dawson. In
addition, we find that Rymer teaches (col. 1, lines 3-10)
simulating a coastline in a "navigational training system”
which is a non-real-world display. We find Rymer’s teaching
to also be cumulative of the teaching of Dawson. From these
teachings, we find that the prior art teaches reading said
non-real-world visual database into a filtered data structure,
but not as part of a method of creating a hard copy database
correlatable navigational chart. We agree with the examiner
(answer, pages 4 and 5) that Dawson (col. 9, lines 16-20) and
Thompson (col. 5, lines 4-67, and Figure 3) teach determining
a number of contour intervals for a block of terrain, and
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