11/19/2022 0 Comments Calculating altitude geometry![]() Pressing Ctrl+Arrow increases the step width, Alt+Arrow descreases and Ctrl+Alt+Arrow decreases even more. Press Esc to reset a field to the start value. You can compare the Globe view with the Flat Earth view by choosing the option Model = Globe+FE. View Panel Here you can Pan, Tilt and Zoom the view. Target 1, Target 2 Panels You can add more targets to the scene and arrange them. Note you probably have to change the SidePos to see the additionally created objects. Use NObjects to create multiple copys of Target 1 which are controlled as a group. Use Target 2 to create another independent set of objects. Refraction Panel Many more options to set refraction according to atmospheric conditions or to set to commonly used fixed values. See Refraction ( Finding the curvature of the Earth) for detailed explanations. Units Panel Here you can enter values in any length units and convert them to any other units. Save/Restore Panel You can save the current configuration in an URL to copy it to a Youtube comment by clicking on Get App URL. Klicking on the generated URL opens this page and restores the App state as it was at the time Get App URL was pressed. In this panel some calculated object data is displayed. If multiple objects are selected, the data for the nearest object is displayed. Visible, Hidden: how much of the object size is hidden behind the horizon and how much is visible.Īngular Size, Visible Angle, Hidden Angle: like above but in angular size. The angular size is arctan( size / distance ) in degrees.ĭrop: is the amount the surface at the target has dropped from the tangent plane at the surface of the observer. This amount depends on the surface distance between observer and target. This distance is dependent on the Target Distance and the Side Pos of the target via Pythagoras. Refraction Angle: How much of the object appears lifted due to refraction expressed as an angle. See Refraction-Angle ρ how this angle is calculated. Lift Absolute: absolute amount of apparent lift of the object with respect to eye level due to refraction. Relative to Horizon: amount of apparent lift of the object with respect to the horizon due to refraction. The horizon appears lifted with respect to eye level by refraction too. If an object lies behind the horizon, its lift relative to the horizon is smaller than the absolute lift of the object with respect to eye level. Target Top Angle, Target Top Angle FE: Angle α between target top and eye level for globe and flat earth (FE) respectively. The angle is positive if the target top is above eye level. Some theodolites measure a so called zenith angle ζ. ![]()
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