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# GreatCirc 2.0

## GreatCirc 2.0

### GreatCirc 2.0 Ranking & Summary

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User Review: 0 (0 times)
File size: 2.2MB
Platform: Windows XP
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Publisher: Gunamoi Software

### GreatCirc 2.0 description

GreatCirc 2.0 is known as an easy yet efficient tool for calculating Great Circle distances on the earth's surface, and plotting points and great circle paths on a world map.

The "great circle path" is the shortest direct route between two points on the earth's surface.  Because the earth is a globe, the shortest path between any two points lies on a circle which is centred at the earth's core and passes around the surface of the world.  Such a path will appear to be a curved line when drawn on a flat world map because of the distortion inherent in mapping the globe onto a flat map.

GreatCirc can calculate the Great Circle Distance between any two points on the earth.  Also, given a starting point, direction and distance it can calculate the Great Circle End Point.  In both cases, GreatCirc will plot the resulting Great Circle path on a world map.  GreatCirc can also do a Coverage Area calculation, given a centre point and a range, GreatCirc will plot the resulting circle on a world map and calculate the area of the earth's surface enclosed within the circle.

Major Features:

1. Basic Features (Free)
• Great Circle Distance calculation: find the shortest distance and direction between two points.
• Great Circle End Point calculation: find the end point of a great circle path, given start, distance and direction.
• Rhumb Line Calculation: find the distance between two points along a line of constant bearing.
• Coverage Area calculation: find a circular coverage area, given a central point and the radius.
• View the Great Circle, Rhumb Line, or Coverage Area plotted on a world map, in equirectangular projection.
• Enter map points by typing their latitude & longitude coordinates, in decimal, or degrees,minutes,seconds format.
• Enter map points by clicking on the world map.  Left-click for Point 1, right click for Point 2.
• Choose map points from a built-in list of Major Cities.
• Perform calculations using a simple spherical earth model, or the WGS84 standard ellipsoid.
• Main Window
• View the world map in Mercator projection or Globe View. (requires DirectX).
• Zoom the world map to get a closer look, or to more accurately click a location.
• Move around the zoomed world map, or rotate the Globe view.
• Save the map image, complete with lines or coverage area, to a bitmap file.
• Save the calculation results to a HTML Report file, or to a comma separated text file for loading into a spreadsheet.
• Calculate and display the magnetic azimuths (compass directions), in addition to the True azimuths.
• Choose map points from a user supplied text file.
• Switch to Batch Mode.
• Batch Mode Window
• Load a batch of locations and paths from a user supplied text file.
• Plot great circle lines and label locations on the flat world map.
• Choose a mix of colours for lines and labels.
• Zoom and resize the map image.
• Save the resulting map images, with lines and labels, to a bitmap file.
• Treat batches of locations as a series of connected waypoints, or as a star with the first point as hub.
• Save batch Great Circle Distance calculations in a HTML Report file, or to a csv file for loading into a spreadsheet.

Enhancements:

• New Features
• Basic Features (Free)
• A new tab to do Rhumb Line calculations.
• New Major Cities Tool to let user select points from built-in list of Major Cities.
• Improved transparent coverage shading option, now default.
• Right-click on coverage map now sets coverage edge.
• Option to draw latitude/longitude grid lines on map.
• User can now enter decimals into degrees box and program will calculate and overwrite minutes and seconds.
• World Magnetic Model updated to latest WMM2010.
• Magnetic azimuths now displayed on calculation tabs and included in saved reports.
• New Mercator Projection and Globe View options. (requires DirectX)
• New Tool to allow user to select points from a user supplied text file list.
• In Batch Mode, can zoom (left-click) and unzoom (right-click).
• Can open another batch file without closing batch mode.
• Option to load an alternate map image in Batch Mode.
• Batch Mode will now query whether to treat a plain input file as a series of waypoints, or as a star (hub & spokes).
• User can now specify new Star 'S' command in the input file format.
• Improved look and layout of HTML report files.
• Spherical Earth/WGS84 Ellipsoid options now also available in Batch Mode.
• Bug Fixes & Other Refinements
• Fix to Vincenty algorithms to ensure they complete, and don't lock up.
• Fixed bug on main window map zoom which made map creep.
• Hiting Enter key in a text box now forces a calc, instead of just beeping.
• Fixed some memory leaks.
• Coverage options now greyed out when not on coverage page.
• Magnetic Azimuth tool not available on Coverage page.
• Fixed title on Save Results file selection dialog box.
• Closing Batch Mode Window now ends the program.
• Azimuths now shown only to 1 decimal place.

Requirements:

• A PC running Windows XP (see this link for tips on using the program under Windows 7).
• 6MB free hard disk space.
• Screen resolution set to at least 800x600 (1024x768 preferred).
• If you choose to register, you will also need DirectX v9 or later to support the globe view option.

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