![]() The conical surface thus formed is then unrolled to give a triangular sheet which is then flattened out (stretching the area towards the apex), in the form of a flat rectangular sheet. the angles are preserved so longitudes are at right angle to the latitudes. The spherical surface of the Earth is then projected conformally onto the conical surface i.e. the slopes of the cone form secants to the Earth's surface. In this an imaginary conical surface is placed on the Earth, in such a way that it intersects the Earth's surface at two Standard Parallels (a pair of latitudes), i.e. This was developed by Johann Heinrich Lambert around 1772. ![]() ![]() The Indian Grid System uses the Lambert Conformal Conic Projection system (also known as Conic Orthomorphic Projection) with 2 Standard Parallels. ![]() All of them have their own advantages and disadvantages. There are a number of ways to do this, known as map projection systems. The Earth's spherical (or rather ellipsoid/spheroid!) surface needs to be depicted as a flat surface for maps. ![]()
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