TopoLT Frequently Asked Questions

Is there a network version?

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

How do I load the program?

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.

Which are the limitations of the trial version?

The trial version can be used without limitations for 30 days from installation. After the trial period expires, in order to continue to use the TopoLT program, you must buy a license.

How can I learn to use TopoLT?

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 and Sample Drawings sections of the Download page.

Where can I download the trial version?

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.

How can I register the program?

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.

Does the program run on 64-bit systems?

Yes, please see the system requirements.

How can I receive technical support in case I need it?

In order to receive technical support you must complete the technical support request form on the Resources 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

How do I load the program?

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.

Which are the limitations of the trial version?

The trial version can be used without limitations for 30 days from installation. After the trial period expires, in order to continue to use the ProfLT program, you must buy a license.

How can I learn to use ProfLT?

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 and Sample Drawings sections of the Download page.

Where can I download the trial version?

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.

How can I register the program?

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.

Does the program run on 64-bit systems?

Yes, please see the system requirements.

How can I receive technical support in case I need it?

In order to receive technical support you must complete the technical support request form on the Resources 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.)

TransLT Frequently Asked Questions

How can I register the program?

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.

How can I receive technical support in case I need it?

In order to receive technical support you must complete the technical support request form on the Resources 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).

What is the EPSG database?

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.

What types of map projections does TransLT support?

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

What types of transformation does TransLT support?

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

What types of GRID files does TransLT support?

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

(N, E) sau h

.gsb1 Binary NTv2 format, files with multiple grids that cover more areas, the grids can have sub-grids attached

(φ, λ)

.dat Binary NTv1 format

(φ, λ)

.lla ASCII Latitude and longitude corrections in PROJ4 format

(φ, λ)

.las / .los2 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
.txt3 ASCII OSTN02/OSGM02 1D or 3D format

(N,E,H), (N,E) or H

.txt4 ASCII Geoid model CING11 format

h

Note1: For the .gsb files that contain sub-grids the interpolation is made in the last sub-grid where the point is found. Firstly it is searched for the main grid where the point is found and afterwards it is searched in all its descendants. If the point is inside a sub-grid, this sub-grid is used for interpolation.

Note2: The .las and .los files are used together. For selection one of the two files will be selected.

Note3: For files with .txt extension, which can be in either IGN or OSTN02/OSGM02 format, the differentiation of these is made by choosing file names containing the words OSGM or OSTN for OSTN02/OSGM02 format, file names that do not contain these words being considered in IGN format.

Note4: Similar to note 3, but the text inside the file name is in this case GM0811 starting with the third character.

What offset methods does TransLT support?

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)