TopoLT Frequently Asked Questions

For the moment there is no network version, the license type is single license for each computer. The same is true for ProfLT application.

Open your CAD application and type the APPLOAD command (or a similar command depending on the CAD application you are using). When the Load/Unload Application window opens, select the TopoLT.lsp file (by default you can find it in C:\Program Files\TopoLT) and press the Load button.

After the program loads you should receive the message “TopoLT.lsp successfully loaded”. Press the Close button.

The trial version can be used without limitations for 10 days from installation. After the trial period expires, in order to continue to use the TopoLT program, you must buy a license.

TopoLT is provided with a set of exercise files for practice and with the program help file where every command is presented and explained. Based on these exercises we developed written and video tutorials which explain the most important features of the application.

Please download the tutorials and exercises from User Manuals page of the Download menu.

You can download the trial version of TopoLT from the Downloads page. To acces the downloads you are required to log in or create an account.

After you bought the license you can register it using the Software Registration function. In the registration window write the user name, company name and registration code from your license certificate and press Register.

Yes, please see the system requirements.

In order to receive technical support you must complete the technical support request form from the Support page.

There you have to complete your name, email, and in the Message field please describe as detailed as possible the problem you encountered. We may contact you for additional information if necessary (screenshots, drawing file, etc.)

ProfLT Frequently Asked Questions

Open your CAD application and type the APPLOAD command (or a similar command depending on the CAD application you are using). When the Load/Unload Application window opens, select the ProfLT.lsp file (by default you can find it in C:\Program Files\ProfLT) and press the Load button.

After the program loads you should receive the message “ProfLT.lsp successfully loaded”. Press the Close button.

The trial version can be used without limitations for 10 days from installation. After the trial period expires, in order to continue to use the ProfLT program, you must buy a license.

ProfLT is provided with a set of exercise files for practice and with the program help file where every command is presented and explained. Based on these exercises we developed written and video tutorials which explain the most important features of the application.

Please download the tutorials and exercises from User Manuals page from Download menu.

You can download the trial version of ProfLT from the Downloads page. To acces the downloads you are required to log in or create an account.

After you bought the license you can register it using the Register Application function. In the registration window write the user name, company name and registration code from your license certificate and press Register.

Yes, please see the system requirements.

In order to receive technical support you must complete the technical support request form from the Support menu.

There you have to complete your name, email, and in the Message field please describe as detailed as possible the problem you encountered. We may contact you for additional information if necessary (screenshots, drawing file, etc.)

TransLT Frequently Asked Questions

After you bought the license you can register it using the About TransLT function.

In the registration window write the user name, company name and registration code from your license certificate and press Register.

In order to receive technical support you must complete the technical support request form from the Support page.

There you have to complete your name, email, and in the Message field please describe as detailed as possible the problem you encountered. We may contact you for additional information if necessary (screenshots, drawing file).

The EPSG Geodetic Parameter Dataset (EPSG Dataset) is a repository of parameters required to:

  • define a coordinate reference system (CRS) which ensures that coordinates describe position unambiguously.
  • define transformations and conversions that allow coordinates to be changed from one CRS to another CRS.

Supplementary information about the signification of the terms and the organization mode of the EPSG database can be found in the Guidance Note Number 7, part 1: Using the EPSG Geodetic Parameter Dataset published by OGP and available for download and viewing at the address www.epsg.org.

From the 6.1 version (july 2001) for the EPSG database has been adopted a new strategy according to which the recordings that contain errors will never be deleted. It has been put into practice by introducing an indicator (deprecated indicator) that can take the values true or false (yes or no) as the respective recording contains or not significant errors. All interrogations made by the TransLTin the EPSG database use a filter that eliminates the recording that have the deprecated field set as yes.

No.

 Projection name Applicable on
ellipsoid		 Applicable on
spheroid		 Reversible
Cylindrical Projections
1 Cassini-Soldner √ √ √
2 Central Cylindrical √ √
3 Cylindrical Equal Area (Normal) √ √ √
4 Cylindrical Equal Area (Oblique) √ √ √
5 Cylindrical Equal Area (Transverse) √ √ √
6 Equidistant Cylindrical √ √ √
7 Gall Stereographic Cylindrical √ √
8 Hotine Oblique Mercator (Variant A) √ √ √
9 Hotine Oblique Mercator (Variant B) √ √ √
10 Hyperbolic Cassini-Soldner √ √
11 Laborde for Madagascar √ √ √
12 Mercator (1SP) (Variant A) √ √ √
13 Mercator (2SP) (Variant B) √ √ √
14 Mercator (2SP) (Variant C) √ √ √
15 Miller Cylindrical √ √
16 Popular Visualisation Pseudo Mercator √ √ √
17 Swiss. Obl. Mercator √ √ √
18 Transverse Mercator √ √ √
19 Transverse Mercator (South Orientated) √ √ √
20 Transverse Mercator Zoned Grid System √ √ √
21 Tunisia Mining Grid √ √ √
22 Universal Transverse Mercator (UTM) √ √ √
Pseudocylindrical Projections
23 Collignon √ √
24 Eckert I √ √
25 Eckert II √ √
26 Eckert III √ √
27 Eckert IV √ √
28 Eckert V √ √
29 Eckert VI √ √
30 Fahey (Modified Gall) √ √
31 Foucaut Sinusoidal √ √
32 Foucaut Stereographic Equivalent √ √
33 Hatano Asymmetrical Equal Area √ √
34 Kavraiskiy V √ √
35 Kavraiskiy VII √ √
36 Loximuthal √ √
37 McBride-Thomas Flat-Polar Parabolic (No. 5) √ √
38 McBryde-Thomas Flat-Polar Quartic (No. 4) √ √
39 McBryde-Thomas Flat-Polar Sine (No. 1) √ √
40 McBryde-Thomas Flat-Polar Sinusoidal (No. 3) √ √
41 McBryde-Thomas Flat-Pole Sine (No. 2) √ √
42 Mollweide √ √
43 Nell √ √
44 Nell-Hammer √ √
45 Pseudo Plate Carrée √ √ √
46 Putnins P1 √ √
47 Putnins P2 √ √
48 Putnins P3 √ √
49 Putnins P3p √ √
50 Putnins P4 (Craster Parabolic) √ √
51 Putnins P4p √ √
52 Putnins P5 √ √
53 Putnins P5p √ √
54 Putnins P6 √ √
55 Putnins P6p √ √
56 Quartic Authalic √ √
57 Sinusoidal (Sanson-Flamsteed) √ √ √
58 Wagner I (Kavraiskiy VI) √ √
59 Wagner II √ √
60 Wagner III √ √
61 Wagner IV √ √
62 Wagner V √ √
63 Wagner VI √ √
64 Werenskiold I √ √
65 Winkel I √ √
66 Winkel II √
Conic Projections
67 Albers Equal Area √ √ √
68 Bipolar conic of western hemisphere √ √
69 Equidistant Conic √ √ √
70 Euler (Equidistant Conic) √ √
71 Krovak Oblique Conformal Conic √ √ √
72 Krovak Oblique Conformal Conic (North Orientated) √ √ √
73 Krovak Oblique Conformal Conic Modified √ √ √
74 Krovak Oblique Conformal Conic Modified (North Orientated) √ √ √
75 Lambert Conformal Conic (1SP) √ √ √
76 Lambert Conformal Conic (1SP) West Orientated √ √ √
77 Lambert Conformal Conic (2SP) √ √ √
78 Lambert Conformal Conic (2SP) Belgium √ √ √
79 Lambert Conformal Conic (2SP) Michigan √ √ √
80 Lambert Conic Near-Conformal √ √
81 Murdoch I (Equidistant Conic) √ √
82 Murdoch II √ √
83 Murdoch III (Equidistant Conic, minimum error) √ √
84 Perspective Conic √ √
85 Tissot √ √
86 Vitkovskiy I (Equidistant Conic) √ √
Pseudoconic Projections
87 Bonne (South Orientated) √ √ √
88 Bonne (Werner for lat.1sp = 90°) √ √ √
Polyconic Projections
89 American Polyconic √ √ √
90 International Map of the World (Modified Polyconic) √ √ √
Azimuthal Projections
91 Azimuthal Equidistant √ √ √
92 Colombia Urban Projection √ √ √
93 Gnomonic √ √
94 Guam (Azimuthal Equidistant) √ √
95 Lambert Azimuthal Equal Area √ √ √
96

td>

 Lee Oblated Stereographic √ √
97 Miller Oblated Stereographic √ √
98 Mod. Stererographics of 48 U.S. √ √
99 Mod. Stererographics of 50 U.S. √ √ √
100 Mod. Stererographics of Alaska √ √ √
101 Modified Azimuthal Equidistant (for Micronesia) √ √
102 Oblique Stereographic √ √ √
103 Orthographic √ √ √
104 Polar Stereographic Variant A (Universal) √ √ √
105 Polar Stereographic Variant B √ √ √
106 Polar Stereographic Variant C √ √ √
107 Stereographic (J.P. Snyder formulas) √ √ √
108 Topocentric local √ √ √
109 Vertical Perspective √ √
110 Vertical Perspective (Orthographic case) √ √
Miscellaneous Projections
111 New Zealand Map Grid √ √
112 Van der Grinten √ √

Polynomial transformations

Method Polynomial degree Reversible operation
General polynomial 2
3
4
6
13
Reversible polynomial 2 √
3 √
4 √
6 √
13 √
Complex polynomial 3
4
Madrid to ED50 polynomial 1

Transformations with parameters

Transformation type Method No.
parameters		 Invertible
parameters		 Reversible
Transformation 1D 3D plane rotation

5

√
Translate to elevation

1

√

√
Transformation 2D 2D Helmert conformal transformation

4

√

√
2D Helmert conformal transformation with rotation origin

6

√
2D orthogonal affine transformation

5

√
2D non-orthogonal affine transformation

6

√

√
Transformation 3D 3D Helmert, Bursa-Wolf method, conformal transformation

7

√

√
3D Helmert, Molodenski-Bedekas, conformal transformation

10
3D Helmert conformal transformation

7

√

√
3D affine transformation

8
3D affine transformation

9
3D affine transformation with rotation origin

12
Time-dependent 3D transformation, Bursa-Wolf method

15

√

√
Time-dependent 3D transformation, Helmert conformal

15

√
File extension Format File description Applied to
.grd Binary ANCPI 1D or 2D format

(N, E) or h
.gsb Binary NTv2 format, files with multiple grids that cover more areas, the grids can have sub-grids attached

(φ, λ) or h
.dat Binary NTv1 format

(φ, λ)
.lla ASCII Latitude and longitude corrections in PROJ4 format

(φ, λ)
.las / .los Binary NADCON format

(φ, λ)
.94 Binary Geoid model VERTCON format

h
.bin Binary Geoid model NGS format

h
.byn Binary Geoid model GSD format

h
.sid ASCII Geoid model NZGV format

h
.grd ASCII EGM96 geoid model, NGA format

h
.gz ASCII EGM2008 geoid model, NGA format

h
.mnt ASCII IGN with MNT format

(φ, λ) or h
.txt ASCII IGN with TXT format

(φ, λ) or h
.txt ASCII OSTN02/OSGM02 or OSTN15/OSGM15 1D or 3D format

(N,E,H), (N,E) or H
.txt ASCII Geoid model CING11 format

h
.gri ASCII Geoid model OSGM15 format

h
*PNG*.dat ASCII Geoid model PNG (Papua New Guinea) format

h
.isg.txt ASCII Geoid model ISG format

h
.csv ASCII Geoid model NZLVD (New Zealand) format

h
.gsf ASCII Geoid model Carlson SurvCE GSF format

h
.ggf Binary Geoid model Trimble GGF format

h
Method name Applied to Reversible
Longitude rotation

λ

√
Vertical Offset

h

√
Vertical Offset and Slope

h

√
Geographic 2D offsets

(φ, λ)

√
Geographic 2D with Height Offsets

(φ, λ, h)

√
Geographic 3D offsets

(φ, λ, h)

√
Geographic 3D to 2D conversion

h = 0.0

√
Geographic 2D axis order reversal

(φ, λ)

√
Geographic 3D axis order change

(φ, λ)

√
Change of vertical axis direction

h

√
Change of horizontal axes directions

(φ, λ), (N, E)

√
Change of all axes directions

(N, E, H), (X, Y, Z)

√
Change of vertical axis unit

h

√
Change of horizontal axes units

(φ, λ), (N, E)

√
Change of all axes units

(N, E, H), (X, Y, Z)

√