A diagonal line is a straight line that connects two non-adjacent corners of a shape, typically forming a 45-degree angle with the sides of the shape. An oblique line, on the other hand, is any line that is neither horizontal nor vertical, and can be at any angle other than 90 degrees. In essence, all diagonal lines are oblique, but not all oblique lines are diagonal.
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The measurements are taken at right angle to the survey line called perpendicular or right angled offsets. The measurements which are not made at right angles to the survey line are called oblique offsets or tie line offsets.
It is neither. A diagonal line occupies the range of everything in between those two absolutes.
Oblique lines:
A line which intersects another line at an angle between 0 and 180 degrees.
a straight line