1.01 / July 30, 2012
(3.2/5) (21)

Description

The Geodetics Calculator is designed to solve the first ("direct")and second ("inverse") geodetic problems with an accuracy of 1e-6meters over a range of 27 different reference ellipsoids andspheriods.Background:The first ("direct") geodetic problem isdefined in the following manner: given a point (in terms oflatitude and longitude) and a direction ("azimuth") and distancefrom that point to a second point, determine the location (in termsof latitude and longitude) of the second point.The second("inverse") problem is defined in the following manner: given twopoints (in terms of latitude and longitude), determine thedirection ("azimuth") and length of a line (in our case, both ageodesic curve (a great circle) and a rhumb line) that connectsthem.Usage:*To solve the first ("direct") geodetic problem, simplyenter the origin point, fill direction and azimuth fields and pressthe Calculate button.*To solve the second ("inverse") geodeticproblem, simply enter the origin and destination points and pressthe Calculate button.*In order to change the units in which theinput or output fields are given, simply choose a differentmeasurment unit and press the Calculate button.Terminology:*GeoidAltitude output field rtepresents the height of the local geoid(EGM96 = Earth Gravity Model 1996) above mean sea level at theorigin and destination.*Forward output field represents the azimuthfrom origin point to destination point.*Backward output fieldrepresents the azimuth from destination point to originpoint.*Direct output field represents the length of a straight line("geodesic curve" / "great circle") connecting the origin anddestination point, along the reference ellipsoid.*Rhumb outputfield represents the length of a rhumb line connecting the originpoint to the destination point, along the "meridional earthspheroid model" (radius of 6367.445[km]).*Latitude and Longitudeoutput fields represent the location of the point located at agiven azimuth and distance from the origin point (they are given indegrees with a decimal notation).Notes:*Origin and Destinationpoints location can be entered in two different notations: >degrees decimal notation: choosing "decimal" would require thelocation input field to be entered in degrees in decimal notation,eg.: 32.156845 or -4.563542. > degrees/minutes/seconds notation:choosing "d/m/s" would require the location input field to beentered in degrees/minutes/seconds notation, eg.: 32 50 6 or -14 2950. notice that a space should be enter between the degrees,minutes and seconds.*Longitude is given in the boundary of [-180.0,180.0] degrees. Negative longitude represents the westernhemisphere and positive longitude represents the easternhemisphere.*Latitude is given in the boundary of [-90.0, 90.0]degrees. Negative latitude represents the southern hemisphere andpositive latitude represents the northern hemisphere.*If the originand destination points are the same, than the distance between themwould be zero, and the azimuth between them would be NaN ("not anumber").*If the distance entered by the user is such that thereference ellipsoid would be encircled, than the calculator wouldtake it into consideration.*Output fields are labeled using indentfont, to seperate them from input fiields.*Geoid altitude iscalculated using a bilinear interpolation performed upon a 0.25degrees grid of point value in a "tide-free" system. The Geoid isgiven relative ot the WGS84 ellipsoid. Maximum error in Geoidaltitude is one meter.*Rhumb line distance is calculated usingearth spheroid radius of 6367435[km]. Deviation from othercalculators might originate from the usage of a different earthradius.Questions or bug reports? please contact me atmalta.dan@gmail.com.For more applications, check out my publicprofile at http://profiles.google.com/malta.dan/about.ENJOY

App Information Geodetics Calculator

  • App Name
    Geodetics Calculator
  • Package Name
    malta.geodeticscalculator
  • Updated
    July 30, 2012
  • File Size
    673k
  • Requires Android
    Android 2.2 and up
  • Version
    1.01
  • Developer
    Dan Malta
  • Installs
    5,000+
  • Price
    Free
  • Category
    Tools
  • Developer
  • Google Play Link
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