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"intelligent" elements in the map 
(e.g. the possibility of off-setting 
forest or other  topographi-cally 
defined objects) and the higher degree 
of detail for topo-graphic objects. 
The contour line theme now forms an 
important part of sketch-planning of 
e.g. roads and other large-scale 
construction work. It is also the 
only information about the form and 
variation of the terrain. As this is 
a very comprehensive theme in terms of 
data, it is not intended to form a 
basic part of any of the packages, but 
it is available as an optional extra 
for DK-3. To begin with, height data 
will be based on the 5 m contour lines 
of the 1:50.000 map. 
Administrative boundaries are limited 
to county and municipal boundaries in 
the DK-1 package. In the DK-2 and DK-3 
packages they are supplemented by 
boundaries between parishes and 
various associations of house owners, 
and by surveying district boundaries. 
In the DK-1 and DK-2 packages these 
data are thinned out to correlate with 
the "scale of use". 
The nautical chart is not included in 
any of the standard packages, as we do 
not expect very many to use the charts 
together with the other elements. 
However, information about depths in 
coastal areas does belong together 
with the contour line picture. 
Administrative basis 
Cross reference key. In all of the 
packages the option of graphical 
presentation of the various 
administrative registers is secured by 
means of the cross reference key. In 
order to ensure as wide a scope of use 
as possible, some of the central keys 
of the cross reference register can be 
supplied separately together with the 
packages, which facilitates use of the 
graphical pointer with different 
administrative keys (title no. and 
address) . 
Administrative options 
Administrative options can be added to 
all of the packages in the IDM of 
Denmark. 
623 
The planning register. In connection 
with preparing the digital cadastral map 
it will be possible to establish the 
various planning boundaries. It will 
therefore also be relevant for the 
Survey to be able to supply planning 
register information together with these 
boundaries. 
The BBR and ESR register is usually 
accessible for the individual 
municipality/county. It would be 
natural for other users if the National 
Survey could market parts of the 
contents together with the rest of the 
package, so that these users could be 
supplied with the  "nonsensitive" 
information from these registers. For 
municipal users it would perhaps be 
enough if we supplied only the 
"pointers" for the registers. 
Adaptation of products to each other 
The necessary adaptation of the various 
products so that they match makes it 
necessary to establish some concrete 
procedures for the adaptation itself and 
for subsequent updating. The adaptation 
can be divided into the two following 
areas: 
- adaptation of themes (e.g. name 
themes, administrative boundaries 
and surveying district boundaries). 
This would include the need for 
thinning out and generalising 
certain products. 
- adaptation of layout (e.g. title 
numbers, addresses, street names 
and fixed point numbers). 
Not only do the individual products need 
to be adapted to the Survey's other 
products, they also need to be adapted 
to possible external products which can 
be used in a natural connection with 
them. However, prior to such adaptation 
to external products, it should be 
assessed what the interfaces between the 
products are. External adaptation 
should be performed with great care and 
in accordance with an overall, 
coordinated strategy. 
Updating 
It is true for the IDM of Denmark as for 
all other maps that updating procedures 
must be laid down from the beginning.