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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
several marginal annotations including the sheet designations
and legend entries as described in chapter 3.
With PDF, which is suited to handle all map contents both
raster and vector data, a proven and widely used format is
provided by PIMap. This is of special importance, since a map
sheet has to be finished interactively — e.g. with regard to the
placement and the readability of feature names — using vector-
oriented commercial software (Adobe Illustrator, CorelDraw or
Macromedia FreeHand respectively).
ASCII Editor
Map Definition
Cartographic Software Package PIMap
Generation of Vector Data (Contours, Grids, 2.)
Adjustment of Raster Image Data to Map Surface
Sheet Composition (Title; Annotations, ...) -
Vs
Commercial Graphic-Program
Review of Map Sheet, e.g. Lettering Placement
Interactive Postprocessing (if necessary)
Figure 3. Overview of map production line
Since PIMap enables not only the Sinusoidal and Lambert
Azimuthal projection — as it is a requirement for the Topogra-
phic Image Map Mars 1:200,000 — but all common projections,
the software is applicable for the generation of any Martian
maps including the common series as listed in chapter 2.3.
Moreover, topographic mapping of other planetary bodies (with
spherical or ellipsoidal reference surfaces) is supported. Never-
theless, as a consequence of new developments — in particular
with regard to thematic mapping purposes — the software
System will be upgraded accordingly.
S. FIRST RESULTS
5.1 Specimen Sheets
With the original development of the Topographic Image Map
Mars 1:200,000 series the basic concepts and layout have been
presented by means of several examples. Based on the series
definitions, amongst other projects the Mars Pathfinder landing
site has been mapped by Lehmann et al. (1999).
In preparation of the Mars Express mission, specimen sheets
have been generated that already feature most of the changes
and/or updates as described in this paper (cf. Gehrke et al,
2003b). Such examples are based on Mars Orbiter Camera
(MOC) wide angle imagery and Mars Orbiter Laser Altimeter
(MOLA) topography; results have been presented by Gehrke et
al. (2003a).
873
Furthermore, a few tests with bodies different from Mars, i.e.
the Saturnian satellites, confirmed the flexibility of the software
PIMap prior to the HRSC mapping phase.
5.2 First HRSC Maps
Based on the first HRSC data, orthoimages and DTMs have
been generated at DLR for cartographic utilization. Several
Topographic Image Map Mars 1:200,000 sheets as well as
special target maps following this concept have been generated
at the Technical University of Berlin using PIMap. Thus, e.g.
the Albor Tholus volcano (Figure 2) or the Hydraotes Chaos
region (Figure 4), which is part of the Martian valley complex
Valles Marineris, are mapped in very impressive sheets of high
quality.
|. M 100k 1.17N/323.17E OMKT |
|
36*30' 36°20' West
323°30° 323°40' East |
140 | |
1241 |
1°40° |
|
|
|
|
1430"
rao | |
e
Section of M 100k 1.17N/323.13E OMKT, a special
target map of the Hydraotes Chaos region (again,
areas without HRSC image information are shown
in grey)
Figure 4.
6. CONCLUSION
The HRSC camera system aboard the Mars Express orbiter
opened up a new era of Mars mapping; obtained images still
inspire both the public as well as the scientific community. As
one high-level result, the Topographic Image Map Mars
1:200,000 series, based on HRSC imagery, now becomes true
as the first large-scale map series of our neighboring planet.
Hence, it enlarges and completes the existing band widths of
Martian map series. With regard to several updates that have
been made, the Topographic Image Map Mars 1:200,000 pre-
sents itself as a very modern product, which will be the guide-
line for future topographic map series in larger scales, for
special target maps and for comparable thematic map products
as well.
The cartographic software system PIMap, which handles the
automatic map production, has been developed at the Technical
University of Berlin. Throughout several tests in preparation of
the Mars Express mission and most important by generating the
first map sheets from HRSC image data, PIMap did indicate
and eventually prove its operational status. Software upgrades —