pasis of
ssment
ds
ny was
spatially
ements
nced IT
1d envi-
e when
; on the
jyllowing
jre type
ck con-
n ecolo-
ological
to esti-
re types
:25,000
dressed
! of ero-
sion hazards as well as to the mapping of urban climate. An
appraisal of urban greenery is eminently feasible. The vitali-
ty of roadside vegetation can be determined, and parklands
cleanly subdivided into meadows and woodlands. The prin-
cipal classes of urban biotope mapping can be very effecti-
vely determined in the IRS colour composite, whilst sub-
classes are only recognisable in individual instances. This
underlines the high value of the data for the up-dating of
biotope mapping, it being possible for instance to signifi-
cantly reduce the extent of fieldwork.
5.4 Surveying
The setting-up of the first stage of ATKIS at a scale of
1:25,000 (survey scale 1:10,000) in Germany has now
been concluded. The survey departments’ study group
(AdV) is currently elaborating procedures for up-dating the
digital data inventory. The up-dating of ATKIS vector data is
to be effected by means of on-screen digitalisation on un-
derlaid ortho aerial images at a scale of 1:10,000. Presup-
posing the need for a resolution at 1:10,000 scale, a neces-
sary ground resolution of approx. 2 m is arrived at. Accor-
dingly, the IRS-1C data would be unsuitable for up-dating
the ATKIS data inventory.
In-house studies, however, suggest that, given accurate
rectification, it is possible to achieve good delimitation of
lands with IRS-1C data - a precondition for object formation
- and also the locational accuracy of 3 - 5 m required by
ATKIS. An awkward area is the discernibility of narrow
A
(O ANTRIX, SIE, Euromap Neustrelitz
Figure 2: IRS-1C PAN with ATKIS overlay (citing a rural area)
linear features such as tracks, especially where these are
overgrown.
Whereas the ATKIS survey is conducted by land surveying
departments, urban surveying departments obviously need
to elaborate larger scales. Nevertheless, it is usual to pu-
blish a digital survey map on a scale of 1:25,000 at the
same time as drawing up and up-dating the digital munici-
pal map on a 1:500 scale. The former is surveyed indepen-
dently of spatia! reference levels SRL 1 (1:500) and SRL 2
(1:10,000) at SRL 3 (1:25,000). An IRS colour composite
represents an excellent basis for the up-dating of this map.
The required locational accuracy of 3 m can also be ad-
hered to given accurate rectification (using a relief model
where the terrain is uneven).
5.5 Landscape Planning
IRS-1C colour composites form a good basis for generating
up-to-date cartographical foundations to underpin visual
interpretation and further mapping functions relating to
landscape planning. By overlaying colour composites with
existing geoinformation, the planner is able to acquire visu-
al information in the first instance that extends beyond what
is contained in the existing data. A panchromatic IRS image
with road, track and waterway networks (ATKIS linear ob-
jects) superimposed serves as an excellent survey chart for
terrain mapping work. As a result, construction develop-
ments not yet recorded in ATKIS can be rapidly identified
for example (see Fig. 2) Some utilisation types such as
Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 255
——
