EuroSDR Projects - Host Ireland

The pictures show the same display level of detail, but do not possess the same geocoding. To create
reference data, an identical geocoding of corresponding images was necessary to display the pictures
with pixel accuracy in the same position. This operation was carried out using ERDAS software from
Leica Geosystems. It should be noted, however, that the information of interest in the contest is not a
correct coordinate interpretation concerning terrestrial coordinates but the correct detection and
interpretation of objects and their classification. Therefore a superordinate georeferencing based on
terrestrial coordinates was not essential.
SAR data sets from Copenhagen and Fjärdhundra were provided by DDRE, Copenhagen; the data set
from Oberpfaffenhofen was provided by DLR-IHR, Oberpfaffenhofen; and the data set from Trudering
was provided by AeroSensing GmbH (now Intermap). The optical data set form Trudering was
provided by Bayerisches Landesvermessungsamt, Munich; from Oberpfaffenhofen by DLR-IHR;
from Fjärdhundra by Lantmäteriet, Sweden; and finally the data set from Copenhagen was provided
by KAMPSAX, DDOland Denmark.
The acquisition times were different for the four test sites. Fjärdhundra imagery was taken in July
1995, Copenhagen in June 1996, Oberpfaffenhofen in May 1999 and finally the imagery from
Trudering was taken in May 2000.
2.2 Additional Data
In addition to SAR and optical data, ground truth data were needed as additional sources of information
about test regions and object types. Therefore, topographic maps for the areas around the test sites
were collected. Topographic maps are, in general, approximations in that small objects are broadened
but they also include more detailed information about the type of land use and classification. Table 4
shows the topographic maps used to create the reference data for the four test areas.
Test Site Map Name Scale Provider, Publication Date
Copenhagen
Danmark, 1514 II
SØ, Holte
1:25.000 Kort- & Matrikelstyrelsen, 1995
Fjärdhundra
Gröna kartan,
Encöping 11H NV
1:50.000 Lantmäteriverket Gävle, 1993
Trudering
München – Trudering,
7836
1:25.000
Bayrisches Landesvermessungsamt
München, 1997
Oberpfaffenhofen Weßling, 7933 1:25.000 Bayrisches Landesvermessungsamt, 2002
190
Table 4: Topographic Maps for the test areas