That step let us get larger area when our Case 1 will actual, then if we use "Null transformation" in tools of creation geodetic transformation:Īs parameters of geodetic transformation I used these values (Seven parameters way). We can use for geodetic transformation general parameters for each country or place that used in laws. As we said above - it calculate transform dealing between ellipsoids (that are base of Coordinate Systems further). Now, let's talk about third value - geodetic transformation. So, for our first Case we have two parameters. But physical definition of Krasovsky ellipsoid is a=6378245 and Inverse flattering = 1/298,3. Despite the fact that reference ellipsoid = ellipsoid, it isn't same things - we can apply geodetic transformation only to reference ellipsoid. In our (Russian) standard we need use for geodetic transformation a=6378245 meters and b=6356863.019 meters. Geodetic transformation path (reverse transformation)Īs Ellipsoid you should use Ellipsoid for your country I'll use Custom Krasovsky ellipsoid, because in Map's creation tools (creation ellipsoid) there are 4 strings:Īfter User type second value (not important - what exactly), other parameters calculated automatically. There are 4 needs values for correct transformation:ĥ*. All materials that I'll demonstrate you can found Here. Our creation I'll demonstrate on example of Russian town Novy Urengoy ( 66☀5′N 76☄1′E). In that article we talking about first way and will work only with Editing Coordinate System (further - Coordinate System=CS). Using interpolation transformation (with GSB files).
Calculate new geodetic transformation between Source and Target datum with some data conversion method.At that Case we can use as geodetic transformation standard parameters for that country/region or "null transformation" Change parameters custom SK to got true results on small area (nearly 10x10 kilometers), where sphere Earth's form don't have much inaccurate with our rectangular coordinates.There are as minimum three global methods in AutoCAD Civil (Map) 3D ways to got needing data:
There are Cases where there are no parameters of geodetic transformation and needing calculate it myself.
#AUTOCAD CS FREE#
Usually, parameters of transformation that systems in free access. There are different situations in practice of design, when objects on smth area dealing with some coordinate system of district or town.
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