TdhZones

proximité App

TdhZones reports location relative to defined polygons (geographic zones) using coordinates obtained from the mobile device on which the app is running. Polygons used by TdhZones are defined within an sqlite database that may be created, viewed and edited using the TdhGIS personal computer software. Coordinates used by the polygons may be longitude/latitude or any coordinates that can be obtained by converting from long/lat data using the Proj4 library.

When the app and database are loaded onto a mobile device, no further information, other than device coordinates, is needed for the app to function (i.e. no network connection is needed). Coordinates are obtained only on user command (i.e. no constant polling to run down device battery).

A typical use of TdhZones would be determining the name of the state where the device is located or is nearest to. The sample data included defines the states for the USA based on data provided at census.gov. TdhGIS includes the ability to import shapefiles, which is how the sample data was created.

TdhZones runs on Android 2.2 or higher and requires permissions for Fine Location and Write External Storage (necessary for database use). (Note: since TdhZones does not request communication permission, it does not and can not transmit location information for other uses. TdhZones does not store location information and does not use location information for any purpose other than as described within the TdhZones_help.pdf file, downloadable from the TdhZones Library)