The 3DMap option in MapInfo Pro does support both "Normalized" and "True
Scale" (as best as I understand them). When you create a 3DMap from a
mapper window with a grid the Create 3DMap dialog has an dropdown for
Units, if you specify a distance unit for the grid values then you are in
reality using true scale for the z values. The actual elevation will be
accurate with repsect to the x and y.
If you leave the units as none, the 3DMap engine generates a bounding box
for the x and y, then it takes the max of the x & y and uses this as a
normal vector in the Z and calculates a scale factor that will exagerate
the z values to a quarter of this maximum height. As an example if you had
a 100x90 grid and did not specify a unit, the engine will generate a scale
factor which will scale the maximum height to 25 (1/4 of the max of x & y).
So in short if you know the units in the grid, specify it and then use the
scale to stretch the surface in the Z direction ("True Scale"). If not,
leave the units as none and the 3dMap engine will generate this
"Normalized" scale factor for you.
Hope this helps.
Tom C.
Sr. Software Engineer
From: "Van Uitregt, John" <[EMAIL PROTECTED]>
on 07/21/2000 09:30 AM ZE10
To: [EMAIL PROTECTED]
cc:
Subject: MI: Z value exaggeration in Create 3D Map command
Hello All,
I am experimenting with the 'Create 3D Map' command and am unable to
ascertain the method for setting the vertical exaggeration to 1, ie.
true scale. When I set the Scale value to 1, the 3D view created is
vertically exaggerated by an unknown amount, but when set to 0 it
generates a flat surface. It seems that an unknown factor is applied.
Vertical Mapper has 'Normalized' and 'True Scale' options which cater
for the setting of exaggerations.
Can someone please help me with this.
TIA.
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