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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
4.2 COSTS
Photogrammetric mapping procedure is the same for using
both aerial images and satellite images. But to procurement
of images are different in aerial photogrammetic mapping
from use satellite images. Satellite imagery does not need
flight mission, photo laboratory processes, scanning and
requires less ground works.
Before providing images it is necessary to do ground control
points establishment and signalization which are required 9-
10 GCP for same area for aerial photogrammetry and satellite
photogrammetry. In this case cost of aerial photogrammetry
and satellite image must be compared.
4.3 TIME
A Ikonos satellite image cover approximately 100 km2 on the
ground. Same area covered approximately 30 pieces aerial
images in 1/16000 scale and 20 map sheets in 1/5000 map
scale. There are huge differences to process to do orthophoto
between one satellite images and 30 pieces aerial images. On
the other hand to provide satellite images very faster than
aerial images. May be one week later it can be provided after
ordering.
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S. RESULTS
Interpretation of comparison results;
e Orientation of satellite images achieved RMS +/-
0.6 m using signalized ground control points.
* If we use some control points as check points this
means (we also change point distribution), RMS of
orientation reached as value between around +/-
0.6m.
e. If we use parcel boundary features this means
features points may have IDENDIFICATION and
DEFINATION problems, RMS of orientation of
satellite images achieved as average value between
+/- 1.50m and +/- 2m.
e Results of comparison data between orthophoto
produced by stereo DTM from satellite images and
aerial photogrammetric data we reached a value
between +/- 2m and +/-3 m RMS depends on
selected feature, which identification and definition
problem has it or not.
e Results of comparison data between orthophoto
produced by YUKPAF and aerial photogrammetric
data we reached a value around +/-3m RMS in
depended from selected feature identification and
definition problem has it or not.
e Results of comparison data between two
orthophotos one of produced by YUKPAF and
other produced by STEREO-DTM we reached
RMS around +/- 1-2m .
e Results of comparison data between aerial based
photogrametric data and satellite based
photogrammetric data we reached RMS around +/-
2m.
* After realization of GPS and total station
measurements more clear results will be achieved.
