Geoscience Reference
In-Depth Information
The LoDs of vector data were filled by topography in scale range 1:25 000
— 1:1 000 000 and generalized by simplifying, merging geometry and
query selection for coarser LoDs. Raster DEMs were derived for scales
1:25 000 — 1:200 000 using contours and hydrography from topographic
maps and GDEM. Rasters for scales 1:500 000 and 1:1 000 000 were
derived by generalization of 1:200 000 models, and for smaller scales by
generalizing GTOPO30. Auxiliary and analytical rasters were calculated
for each LoD. The resulting database structure is presented on
Figure 11
.
Figure 11:
Resulting database structure
As can be seen database content is suitable not only for hypsometric map-
ping but for more common topographic. Map layer structure was imple-
mented using thematic and scale grouping with the last being the highest
level (
Figure 12
).
