High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

- Product Size (Worldview) will be
- Min size: 17.6 x 14km and
- Max size: Up to 17.6 x 28km
Each component is its own file and comes with its own Rapid Positioning
Capability, also called Rational Polynomial Coefficients (RPC).
2. Provision of Ground Control points
International Terrestrial Reference Frame (ITRF) is a realization of
International Terrestrial Reference System (ITRS), which is a definition of geocentric
system adopted and maintained by International Earth Rotation and Reference
Systems Service (IERS). IERS was established in 1987 on the basis of the
resolutions by IUGG and IAG. The origin of the system is the centre of mass of the
Earth. The unit of length is metre. The orientation of the axes was established as
consistent with that of IERS’s predecessor, Bureau International de l’Heure, BIH, in
1984. The Z-axis is the line from the Earth’s centre of mass through the Conventional
International Origin (CIO). Between 1900 and 1905, the mean position of the Earth’s
rotational pole was designated as the Conventional Terrestrial Pole (CTP). The Xaxis
is the line from the centre through the intersection of the zero meridian with the
equator. The Y-axis is the line from the centre to equator and perpendicular to X axis
to make a right handed system. ITRF is a set of points with their 3-dimensional
Cartesian coordinates and velocities, which realizes an ideal reference system, the
International Terrestrial Reference System. Each ITRF is identified by the digits of
the year as ITRFyy e.g. ITRF97, ITRF2000 etc. The latest is ITRF2005 which has the
epoch 1st January 2000. For realization the different techniques are used: Very Long
Baseline Interferometry (VLBI), Lunar Laser Ranging (LLR), Satellite Laser Ranging
(SLR), Global Positioning System (GPS) and Doppler Ranging Integrated on Satellite
(DORIS). Each has strengths and weaknesses - their combination produces a strong
multi-purpose Terrestrial Reference Frame (TRF). ITRF is the best geodetic
reference frame currently available. The GRS80 ellipsoid is recommended by IERS
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