Map
Maps with contours are used to make a digital terrain model
(DTM) . In this work we used maps of 1:50,000 scale. The
contours of the map are converted to a digital image by
drum-scanner.
DTM
DTM. with 198.3 m interval is made from the digital image of
contours using computer. But the height information of each
contour must be attached line by live manually.
Orthophoto image
A digital image of a photograph is converted to an orthophoto
image using DTM and exterior orientation parameters. In this
conversion the earth curvature is taken into account.
Parameters of JERS-1
Some parameters of JERS-1, such’ as ground ^ resolution,
base-to-height ratio and the angle of the forward looking
sensor are used to make JERS-1 simulation stereoscopic
images.
JERS-1 stereoscopic images
An orthophoto image is converted to JERS-1 stereoscopic images
using DTM and parameters of JERS-1. The base-to-height ratio
of JERS-1 stereoscopic images is fixed to 0.3, but in this
system we can select any other base-to-height ratio of
stereoscopic images. The details —of —his^* “part ‘will be
explained in the next section.
MAP
LFC PHOTO.
(1/50,000)
AEROTRIANGULATION
A/D CONVERSION
Y 1 |
EXTERIOR ORIENTATION DIGITAL DTM
PARAMETERS IMAGE (18. 3M)
À 1 Y
PARAMETERS ORTHOPHOTO
OF JERS-1 IMAGE
Y y
JERS-1
STEREOSCOPIC
IMAGES
Figure 1 General flow of the system to make JERS-1
simulation stereoscopic images
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