many of the world’s coordinate systems compute geoid offsets and
estimate the current or historic magnetic field for any location.
It also includes a calculator tool as well as surveying tools to
compute the point scale factor grid convergence traverse inverse
and sun angle. You can also store multiple points and compute
boundary length and area on them or import/export them to CSV
files.
The app uses the PROJ4 library and a lookup file containing
projection and datum parameters to support over 1700 coordinate
systems. Lat/lon UTM US coordinate systems (including US State
Plane) Australian coordinate systems (including GDA2020) UK
coordinate systems (including Ordinance Survey) and many many
others are supported. You can also create your own coordinate
systems if you know the parameters.The app also supports affine
transformations to allow you to set up local grid systems. See
http://www.binaryearth.net/Miscellaneous/affine.html for
details.
The app either takes manual coordinate input or uses your current
GPS location. The computed location can be displayed in Google Maps
via your web browser with a single button press. It also supports
MGRS grid references.
You can export any lat/lon UTM or transverse Mercator coordinate
systems to a HandyGPS datum (.hgd) file for use as a custom datum
in HandyGPS.
The magnetic field calculator page computes the Earth’s current or
historical magnetic field at a given location. The magnetic
declination computed is useful for compass navigation since it
represents the difference between true north and magnetic north.
Field inclination and total intensity are also computed. This tool
uses the International Geomagnetic Reference Field model (IGRF-13).
See http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html for full details.
Years from 1900 through to 2025 are supported.
The app can also compute the geoid height offset for a given
location using the EGM96 model. Geoid offset can be subtracted from
the height reported by GPS to give your actual height above sea
level.
The app also includes a sun angle calculator which can be used to
compute the location of the sun in the sky at any location for any
date and time.
Online help for the app is available at
http://www.binaryearth.net/CoordinateMasterHelp
A version of this app which allows batch coordinate conversions is
now available for Windows. See
http://www.binaryearth.net/CoordinateMaster/Windows
Permissions required: (1) GPS – to determine your location (2) SD
card access – to read and write user projections file.