Flat Earth HD - Satellite Image Viewer app for iPhone and iPad

This is an application that displays satellite images of whole earth in Azimuthal Equidistant projection centering on arbitrary points.

Directions:
Double tap: Move the center of projection.
Pan: Translate maps　(only in the translation mode). Revolve maps around the center of projection (only in the rotation mode).
Pinch: Zoom in or zoom out on maps　(only in the translation mode).

The button on the right side of the navigation bar: Switch between the translation and the rotation mode.

Long Press on the map: Display the shortest path between the center and the long-pressed point. Also, calculate the azimuth clockwise from North and the distance between these points, and show them in a text view. When tap the text view, the text view and the path disappear.

Settings view:
- Center of projection can be specified in either of the following ways:
entering longitude and latitude manually,
selecting a city from a list of cities,
getting the users current location.
- Select the unit of distance: kilometer (km), mile (mi), nautical mile (nm).
- Show/Hide lines of latitude and longitude.
- Show/Hide boundaries of countries.
- Show/Hide names of major cities.
- Show/Hide major airports. (Their names are visible when zooming in.)
- Show/Hide concentric circles.
- Change images:
Blue Marble.
Natural Earth.

The maximum resolution of satellite images in this current version is 4/480 degrees per pixel. This application can be used in offline environment, but will be more limited in resolution.



Credits:
Blue Marble: Next Generation was produced by Reto Stockli, NASA Earth Observatory (NASA Goddard Space Flight Center).
Natural Earth: Free vector and raster map data @ naturalearthdata.com.
Airport data from OurAirports (http://www.ourairports.com/data/).