Downloadable Shareware Software
Welcome to the SeisSoft Shareware Download Page. Home on the Web, since 1995, of the best Projection and Datum Transform software.
The SeisSoft Company has three shareware programs, in three categories:
- X/Y <=> Lat/Long Conversions.
- Datum to Datum Conversions.
- Projection and Datum Constants Modification.
Please remember, this is shareware, not freeware. Download the software. Try the software. If it's no good, delete it from your machine and move on with your life. But if you like it, if you find it useful, please do the right thing and pay for it.
X/Y <=> Lat/Long Projection Software
Coordinate Transform© version 3.1
The user-friendly, Lat/Lon <=> X/Y conversion program for Windows (95/98/ME/NT 4.0/2000).
More Spheroids
Multiple Prime Meridian Support (Greenwich, Brussels, Paris...)
More Units (Chains, International Feet, Links, Indian Yards...)
More Projections (All NAD27 and NAD83 U.S. and Canadian projections, UTM, and 200+ International Projections)
Now Includes Adobe Acrobat Manual
Click here to
download. (approx. 1,501K)
Datum to Datum Conversion Software
SeisSoft Datum Transform© version 3.0
An easy-to-use, Windows (95/98/ME/NT 4.0/2000) shareware program that converts Lat/Long's between datums.
Contains both Molodensky and Multiple Regression Equation Transforms.
The Multiple Regression Transform is the preferred method for converting between various datums. Unfortunately, it is only available for converting between WGS84 and seven other datums:
- Australian Geodetic Datum 1966
- Australian Geodetic Datum 1984
- Campo Inchauspe Datum
- Corrego Alegre Datum
- European Datum 1950
- North American Datum 1927 (Mainland Canada)
- North American Datum 1927 (Continental US)
- South American Datum 1969
The Molodensky Transform is available (at a lower accuracy) for converting between any of several hundred other datums.
Click here to
download. (approx. 492K)
Projection and Datum Constants Modification
For Experts Only!
Software from the SeisSoft Company stores its projection and datum constants in the Windows Registry. A true propeller-head can find these constants in HKEY_CURRENT_USER\Software\SeisSoft. For those of you in the audience with enough geodetic knowledge to add or modify these constants, but lacking the computer skills (or the desire) to modify the Registry directly, the SeisSoft Company is making this utility program available.
This program is especially useful for adding new or custom projections or Molodensky datums.
The user needs to be aware that altering these constants can (and will) change the results of program calculations. The SeisSoft Company will not be held responsible for any errors due to user modification of these constants. Of course it's not like we'll be held responsible for any errors in an unmodified copy either (take a GOOD look at the End User License Agreement the next time you load the software).
Click here to
download. (approx. 396K)