Datum Transformation & Coordinate Conversion, Version 4.1


DTCC4.1, which stands for Datum Transformation and Coordinate Conversionversion 4.1, is a program that will perform:

- Datum Transformation for point coordinates, and

- Coordinate Conversion between grid reference systems, and

- Distance and Azimuth Calculation

Datum Transformation

Datum Transformation converts the coordinates of a single point from oneof many (~200) worldwide local datums to another local datum, including theNIMA standard datum, WGS-84. NIMA has developed a global coordinate system(datum), the World Geodetic System 1984 (WGS-84), which is the standard uponwhich all Mapping, Charting, and Geodetic (MC&G) products arereferenced.

Coordinate Conversion

Coordinate Conversion converts coordinates of a single point from one gridreference system to another.

DTCC4.1 is designed for coordinates determined and measured from maps andcharts.

As the diagram shows, the "INPUT" and "OUTPUT" datums are identified, thenpoints are entered one at a time to the DTCC4.1 program. Output of DTCC4.1can be either to your display only, or to your display and a recording textfile. You can enter as many points for transformation as you like, and youcan change the identity of the datums at any time.

There are, of course, many planning and operational scenarios in which coordinateconversion is required to maintain the accuracy of the information that isderived from maps. DTCC4.1 was developed to serve the field user in transformingmap derived coordinates quickly and accurately.

The behavior of DTCC4.1 Coordinate Conversion is very similar to the behaviorof a hand-held calculator: enter a point, hit the "Transform" button, readthe result. Those steps are repeated for as many individual points as youhave. You also have the opportunity to set DTCC4.1 options before cyclingthrough those three steps. The options include choosing datums, choosinga coordinate type, choosing a coordinate format, and directing output.

Distance and Azimuth Calculation

DTCC4.1 computes the distance and azimuth between two user-defined pointson a user-selected ellipsoid. Calculations are of two types, forward andinverse. With the forward method, the user supplies a starting point (lattitudeand longitude) with a distance and azimuth. A calculated destination point(lattitude and longitude) is returned. With the inverse method, the usersupplies two points, and a calculated distance and azimuth are returned.Further, DTCC4.1 has a mechanism to calculate distances and azimuths betweenan ordered series of user-defined points.

Refer to the DTCC4 Users Guide fordetailed instructions, and for a comprehensive list of supported datums,coordinate systems and grids. There is also a hands-on tutorial in theDTCC4 Users Guide , DTCC4_UG.DOC .

Technical Notes:

- Datum transformation method uses standard Molodensky formulas. Refer toDMA Technical Report 8350.2.

- Refer to in DMA Technical Manual 8358.2 for conversions between GP(geodeticpositioning), UTM and MGRS.


Related NIMAMUSE Documents

DTCC4 Users Guide   DTCC4_UG.DOC

Access and Prepare NIMA Digital Data  APNDD.DOC

Build Your Own Map   BYOM.DOC

Run Specialty Applications   RSA.DOC

NIMAMUSE 2.1 Documentation   INTRO.DOC