Adding User Datums

OziExplorer can use up to 10 user defined datums.

To add User Datums to OziExplorer you need to do the following.

If it doesn't already exist Create a text file called datums.dat in the OziExplorer directory. OziExplorer will read this file the next time it is run, the user datums will always be added to the bottom of the list.

Within this file add the following line or lines (if more than 1 datum is to be added).

The format of the line is as follows :

Datum name , Ellipsoid number , dx , dy , dz

Datum name - Any name you want to enter

Ellipsoid number - All datums have a reference ellipsoid, choose the number from the list below. If the ellipsoid is not in this list then you cannot add the datum, you need to contact the author of OziExplorer and have the ellipsoid added into the code.

dx,dy,dz - these must be known for the particular datum you are entering.

A comma must be used between all the fields.

Example - A line in the file may look something like this

NAD 27 User, 4, -8, 160, 176

Ellipsoid List

0 : 'Airy 1830'; a : 6377563.396; invf : 299.3249646
1 : 'Modified Airy'; a : 6377340.189; invf:299.3249646
2 : 'Australian National'; a : 6378160.0; invf: 298.25
3 : 'Bessel 1841'; a : 6377397.155; invf:299.1528128
4 : 'Clarke 1866'; a : 6378206.4; invf: 294.9786982
5 : 'Clarke 1880'; a : 6378249.145; invf:293.465
6 : 'Everest (India 1830)'; a : 6377276.345; invf:300.8017
7 : 'Everest (1948)'; a : 6377304.063; invf:300.8017
8 : 'Modified Fischer 1960'; a : 6378155.0; invf: 298.3
9 : 'Everest (Pakistan)'; a : 6377309.613; invf:300.8017
10 : 'Indonesian 1974'; a : 6378160.0; invf: 298.247
11 : 'GRS 80'; a : 6378137.0; invf: 298.257222101
12 : 'Helmert 1906'; a : 6378200.0; invf: 298.3
13 : 'Hough 1960'; a : 6378270.0; invf: 297.0
14 : 'International 1924'; a : 6378388.0; invf: 297.0
15 : 'Krassovsky 1940'; a : 6378245.0; invf: 298.3
16 : 'South American 1969'; a : 6378160.0; invf: 298.25
17 : 'Everest (Malaysia 1969)'; a : 6377295.664; invf:300.8017
18 : 'Everest (Sabah Sarawak)'; a : 6377298.556; invf:300.8017
19 : 'WGS 72'; a : 6378135.0; invf: 298.26
20 : 'WGS 84'; a : 6378137.0; invf: 298.257223563
21 : 'Bessel 1841 (Namibia)'; a : 6377483.865; invf:299.1528128
22 : 'Everest (India 1956)'; a : 6377301.243; invf:300.8017
23 : 'Clarke 1880 Palestine'; a: 6378300.789; invf:293.466
24 : 'Clarke 1880 IGN'; a: 6378249.2; invf:293.466021
25 : 'Hayford 1909'; a: 6378388.0; invf:296.959263
26 : 'Clarke 1858';a:6378350.87;invf:294.26
27 : 'Bessel 1841 (Norway)' ; a:6377492.0176;invf:299.1528
28 : 'Plessis 1817 (France)'; a: 6376523.0 ; invf:308.6409971
29 : 'Hayford 1924'; a : 6378388.0; invf: 297.0
30 : 'Danish (Andrae) 1876'; a: 6377019.25666 ; invf: 300.0
31 : 'Walbeck 1819'; a: 6376896.0 ; invf: 302.7821565
32 : 'Walbeck 1819 (2)'; a: 6377016.7608 ; invf: 302.7821565
33 : 'Tenner 1844'; a: 6377096.0 ; invf: 302.5