Photogrammetric Test Site Vaihingen/Enz
The ifp test site Vaihingen/Enz was originally established in
summer 1995 for the geometrical performance acceptance test of
one of the first operational digital airborne line scanning
systems, the Digital Photogrammetry Assembly DPA. Starting from
this, the test site was used several times for different kinds
of investigations: For the independent in-flight evaluation of
new digital airborne sensors as well as for investigations on
the potential of direct georeferencing using integrated GPS/inertial
systems in combination with standard analogue frame cameras.
small village Rosswag
|
The test site itself is located about 20km north-west of
Stuttgart/Germany in a hilly area providing several types of
vegetation and land use, mostly rural area with smaller forests
and villages. It also offers quite steep vineyards and some
quarries. The following image shows the river Enz valley east of
the small village Rosswag. |
test site terrain
|
The spatial extension of the overall test area is about 7.5 km (east-west)
x 4.7 km (north-south). The terrain heights differ between 193m and 356m above mean sea level.
The terrain variations are depicted in the following figure (vertical component 2x exaggerated,
© Landesvermessungsamt Baden-Württemberg) |
The demanding terrain topography can also be seen from the following figures.
Again the vertical component is two times exaggerated. Please click for larger view.
Orthophoto drapped over DTM
|
Shaded view of DTM
|
Slope classification from DTM
|
| Orthophoto drapped over DTM. |
Shaded view of DTM. |
Slope classification from DTM. |
Test site Vaihingen/Enz
|
The terrain model available so far is obtained through airborne laser-scanning.
Flights were ordered by Landesvermessungsamt Baden-Württemberg. Data acquisition was done
in February 2001, using the Optech ALTM 1225 system (flying height 900m, scan frequency 25 Hz,
scan angle +/- 25deg, mean point distance on ground approx. 1.5m). The final DTM is available as 1m grid.
Vertical accuracy is expected to be better than 0.5m.
Although the number of ground control points slightly varies throughout the different test flight campaigns
their principal locations remain unchanged. The point distribution is densified in the centre part of the area
to allow for high resolution and large scale tests. This densified region has an extension of 5.0 km (east-west)
x 2.8 km (north-south). |
Test site dimensions (in Gauss-Krueger coordinates)
Whole area
| Extensions |
|
Easting [m] |
Northing [m] |
| 7400m (east-west) |
Upper left |
3492450 |
5424350 |
| 4700m (north-south) |
Upper right |
3499850 |
5424350 |
| |
Lower right |
3499850 |
5419650 |
| |
Lower right |
3492450 |
5419650 |
Densified central area
| Extensions |
|
Easting [m] |
Northing [m] |
| 5050m (east-west) |
Upper left |
3493200 |
5423400 |
| 2750m (north-south) |
Upper right |
3498250 |
5423400 |
| |
Lower right |
3498250 |
5420650 |
| |
Lower right |
3493200 |
5420650 |
|
The object points are painted targets mostly. They are
independently coordinated from static GPS surveys, with an estimated
accuracy of sigma 2cm for all three coordinate components.
Altogether close to 200 points are available in the test area (flight
campaign 2007). In the densified region the smaller 0.3m x 0.3m
targets are painted in black in the center of the 0.6m x 0.6m sized
white targets.
|
|
Signalized/painted squares 0.6m x 0.6m
| # of points |
distribution of points |
| 172 |
whole test site |
|
|
Signalized/painted squares 0.3m x 0.3m
| # of points |
distribution of points |
| 103 |
densified region only |
|
Siemens star
|
An additional (mobile) resolution target (Siemens star) is
prepared for the flights, if the empirically analysis of the
geometrical resolution potential of airborne sensors is of interest.
The Siemens star has a diameter of 8m and consists of 12 black/white
sections.
The approximate position, where the Siemens star is located (in
Gauss-Krueger) during flights is 3497905m (East) and 5422085m
(North).
|
for further information contact
Dr.-Ing. Michael Cramer
