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Point scale factor
Point scale factor

Description

A simple tool for surveyors.

Given a UTM easting (E), northing (N) and height (H), this app computes the grid/point scale factor, elevation/height factor and combined scale factor values.

The following formulas are used:

Grid scale factor (GSF) = k0 + (E-E0)^2 / (2 * r0^2)
Elevation factor (EF) = R / (R + H + N)
Combined scale factor = GSF * EF

Where:
k0 = Grid scale factor at central meridian (defaults to 0.9996)
E0 = False Easting (defaults to 500000)
r0 = Geometric mean radius of curvature scaled to the grid (defaults to 6375767.131)
R = Mean radius of earth (defaults to 6365314.378)
N = Height of ellipsoid above geoid (defaults to 0.0)

The defaults are chosen so that the results agree with the following document:
http://www.dtpli.vic.gov.au/__data/assets/word_doc/0011/111044/The_Map_Grid_of_Australia_1994_Computational_Manual.doc

The defaults can be changed by selecting the menu and choosing "Settings".

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Point scale factor APK information

Package Name

binaryearth.pointscalefactor

Version Code

15

Permissions

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Details

Version

1.5

Requirements

Android 2.3+

Author

BinaryEarth

Updated

2015-03-24

Size

194.80KB

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mobo-image
LV1
SY-D69238
16/03/2015
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samsung,GT-S7262
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Point scale factor

Point scale factor

BinaryEarth

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Updates to Point scale factor may automatically add additional capabilities within each group.
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