Free topography software for windows

GEOPoint is an easy to use satellite antenna pointing calculator, for geostationary communications satellites. It calculates the azimuth and elevation pointing angles from a given location on the earth towards a specified geostationary satellite.
GEOPoint can also calculate polarisation tilt angles, eirp and frequency stability, antenna G/T, estimate dates and times of annual sun-outage events, and estimate path-loss and rain-attenuation based on ITU-R climate models. As used by Hausfeld Consulting for satellite communications planning.
Free Unregistered Features:
- an easy to use dialog-style user interface for data entry and calculation;
- entry of earth station location coordinates directly, or by clicking on a world map;
- display of satellite elevation contours on the world map to aid in site selection;
- entry of latitude and longitude coordinates in d,m,s format, or as decimal degrees;
- calculation of pointing angles to a specified satellite for common types of antenna mount;
- display of azimuth pointing angles relative to True North, and relative to local magnetic north;
- estimation of antenna movement limits for inclined orbit satellites;
- calculation of polarisation tilt angle, loop-back path delay, and required antenna tracking speeds;
- estimation of the peak dates and times for sun-interference on the receive link.
- output of a summary report in HTML format.<
Registered Features
Registered users of GEOPoint 3.01 will have access to the following extra features:
- ability to zoom the world map one level for more accurate site selection;
- ability to save the current map image to file.
- estimation of site altitude from ITU-R world topography model;
- view and save a diagram of the GEO Arc visible from the site;
- labelling of individual satellites and plotting local horizon and antenna movement limits;
- display of ITU-R Climate Model data for the specified earth station location;
- estimate antenna G/T from user inputs of antenna parameters and frequency;
- calculate path loss between the earth station and satellite at a specified frequency using ITU-R propagation models;
- estimate the impact of satellite motion on EIRP and frequency stability;
- output a detailed report of pointing angles from the site, for all visible satellites, or for a set of satellites specified by the user;
- output a detailed report of sun interference dates and times for given receive antenna parameters;
- output a detailed report of rain attenuation loss for a range of frequencies and link availability;
- output a batch summary report for a list of earth station sites.
- use the latest Norad orbit elements to locate and label satellites on the GEO Arc plot or AzEl reports;
NOTE:
You may install GEOPoint and make use of the free version features at
any time. There is no time limit for use of the free features. In order to access the extended features of the Software, you must Register
and purchase a Licence which will include a registration code to be entered
into the Software. Registration codes may be time limited, or may be limited
to particular versions of the Software.