LanDTM: The world in your hands!

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Last update of February 13, 2012


I need anybody to help me with the translation of the web page from spanish language to english language. Please, translate you the texts and send me them in any file format and I'll do the rest.



Updates corresponding to March 26, 2010

As this update is very important and there are many new applications and tools, the manual has been modified too to include all the new options, (only in spanish, by now. Help me with this, pls). You can go to the "Manual de uso" page where is explained, step by step, all the new options.

  • Selection of Earth zones to import.

    It's created a new tool for you can select a zone of the world, which you want to import points, very much intuitive, showing a drawing of the world for you can select it easily.

  • Pincha en la imagen para verla Pincha en la imagen para verla Pincha en la imagen para verla
  • Draw digital terrain models on the UTM ellipsoid.

    Now, you can view, on the CAD, the calculated data over the real ellipsoid where they was gotten.

  • Pincha en la imagen para aumentarla
  • Draw of meridians and parallels.

    You can draw the data of the meridians and parallels lines on the ellipsoid or on the UTM plain.

  • Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
  • Draw 3D faces over the datum surface.

    You can draw the 3D faces and/or Solids of the sea zones in all the areas of the selected terrain, so the visualization of the data will be more intuitive.

  • Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
  • Georeferenciation of any image.

    If you have a photograph, image, graphic of a Earth zone, and you want to put it as base in the digital terrain model that you are making on the CAD, now you have a tool, very dynamic, it allows to realize this operation. And, not only with a translation but too is allowed a rotation angle. What's more you can to do it in geographical coordinates or in XYZ, into the CAD.

  • Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
  • Export the contouring, points and triangulation to Google maps/Google Earth "KML/KMZ" files.

    Now, you can export any digital model, maked with LanDTM, to Google maps/Google Earth to share with others or, to can view your work over the real terrain, in 3D.

  • Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
    Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
    Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla Pincha en la imagen para aumentarla
  • Modification of the ".mdt" format of the LanDTM program.

    Now, into the ".mdt" file, generated by the program, we are filed some data, which we considere belonging to the owner file. These data are:

    • Maximun length of the lines: Many users have problems with the understanding of this variable, it's for that, now, this variable is saved with the file and when you import geographical data we calculate a suitable value by you.
    • UTM Zone: Now, each time you saved the ".mdt" file, the UTM Zone will be saved with it, so when you open the file again this variable is in the file.
    • Reference ellipsoid: Too, this variable is saved in te file for you haven't to remember it.

  • Incompatibility between the 32 bits and 64 bits files.

    The files maked with a Autocad 32 bits version can't open them with 64 bits version s of LanDTM program, and viceversa. So, the incompatibility between 32 bits and 64 bits platform is maintained.

    If you want transform ".mdt", ".crd", etc, files maked with lanDTM or ProLink, you will have to do it through a autocad ".dwg" file , which keep up the files compatibility.

  • Trabslation of LanDTM to romanian.

    Again, Severin Cazanescu, thank you very much for the translation of the program to romanian language. In this version, all the program is translated to romanian; ProLink, PProtopo and LanDTM. Thank you, Severin. I need more people like you!

  • New compatibility with 64 bits.

    In this new version is included LanDTM for Autocad 2008 64 bits. Too, the ProLink program is ready to run in 64 bits platform to can convert the files in 64 bits versions.

  • Selection of points in LanDTM program more intuitive.

    When you select points, lines or polylines, from the "MDT Data" dialog box, the data showed maked untidy. Now, these data are tidy and, the selection is more intuitive.

Update corresponding to February 9, 2010

  • LanDTM for Autocad 2009 64bits y Autocad 2010 64bits.

    Now, LanDTM works with the Autocad 64 bits versions, as Autocad 2009 as Autocad 2010. The installer program contains these two new options, as you can see in the next image.

  • PProtopo and ProLink translated to romanian language.

    Thank to Severin Cazanescu which translated these two programs to romanian language, and we hope, in a short time, to have LanDTM program, translated too.


  • New videos and tutorials

    There are three new videos/tutorials which explain how to edit a triangulation with the dinamic tools of LanDTM and, too, how to create slopes according a platform. Go you to the videos page to download them.

  • Near future.

    In this update we haven't could make more modifications and improvements in the program, because the work to create LanDTM in 64 bits has been very hard, but we hope, in a short time, we can have a new update, for which we need ideas, about of tools or applications. Now, these are the things we go to do:

    • Create a ellipsoidal representation of the earth, and too, other planets or satellites, with a easy access to particular geographical zones.
    • Meridians and parallels lines to a best representation of the earth.
    • Sincronize with WMS, Web Map Service, to have access to photos, orthophotos and georeferenciated images. These images you can put them below of the digital terrain model and to view cities, roads and any linear representation, which will guide you to design any project.
    • Tool to create the DTM quickly. We want to create a tool which you can select a zone, and although you don't know nothing of maps, you can get the digital terrain model of the selected area. With this every world will be able to use the program.
    • We want to change the colours palette which you draw the solids in autocad, now you only can use the old autocad palette and we want to can create the solids with true colours.
    • Create selection maps to can select the latitude and longitude more easily.

    I'm open to any suggestions. If you have a idea which help you to improve your daily work, you can write me with it.

Update corresponding to December 26, 2009

  • Access to the digital terrain model of all the world.

    In this new update I've included the possibility to add topographical data from digital terrain models files maked by other means.

    So, we can have access to every compiled information by the NASA mission, "The Shuttle Radar Topography Mission", SRTM, It was launched in february of the 2000 year to get the elevations of the earth in 1 second interval, (30 meters), to EEUU, and three seconds, (90 meters), to the rest of the world. You can see the mission features in the next document"SRTM_paper.pdf".

    You can use the program to extract earth's big volumes of information, as we can see in the previous image, or for that little tiles of terrain where you have interest in to prepare any surveying work, as we can see in the next images of Tenerife and La Palma islands, (Canary islands), with the contour lines each 15 meters.

    Too, I've included the possibility to access to the MDT25 files maked by th I.G.N, (Instituto Geografico Nacional), of Spain, where you have the elevations, each 25 meters, extracted from the 1:25000 maps of the MTN, (Mapa Topografico Nacional, National Topographical Map).

    Now yes, you have the world in your hands. Not only to these people which want to have topographical information, of precission, of a zone particular where it's liked to do a work, but to these people want a reliable representation of the earth, by colours or by contour lines. There's not limit, the scale is decided for you. From a terrain of kilometers to the whole south pole, as you can see in the next image.

    The program is as quick and very easy to use, as any people can find it use, in case of to need a geographical representation of any world zone. For example. to get the images you are seeing in this page, I've taked, in each one them, 2 minutes; and the representation is real.

    I'll try to explain the information we have, and how we'ld must use it to get the searched result. I go to do it to the SRTM3 format, (points each 3 seconds, 90 meters), and after you can extrapolate to the rest of the formats.

    We have over 25000 files, which they are found in a little bit of the earth; that bit is a degree, and to understand it better, we'll say that bit, roughly, (I've called it "patch"), is "60 minutes times 60 seconds", that is, 3600 seconds by each degree... And in the projection we have, (UTM WGS84), each second are, roughly 30 meters, (this has lot variation according the longitude and latitude, but with this we can have a rough idea).

    Until here, we know each second is 30 meters, and one degree has 3600 seconds, That's over 30x3600 meters, 10800 meters, 108 kilometers.

    SRTM3, means the satellite went taking a point of the terrain each 3 seconds, that is, each 90 meters. If this is like that, we can deduce by each "patch" will have 3600/3, points; that is 1200 points each row and column. Is for that, one patch, of a degree, in SRTM3 format, will have 1200x1200 points, divided in rows and columns, that is none other than 1440000 points. (Say here, to the experts, in true are 1201 rows times 1200 columns, because are valids the first second and the last second, but this would be to complicate the explanation, and I'ld like that eveybody would be able to understand this).

    So, recapitulating, to the earth, we have over 25000 files, one degree by file, that is, 1440000 points by each patch, which is INFINITE!!! points in total :D ;), a lot of points!

    The question, now, is obvious. How do we management so much information? and where do we can take out it?

    What I did was to inform me, and I saw that this information is public, that is, the files are free, always you use it non-profit, as it's my case. So I searched it and I found it, all, all, all in the next link U.S. Geological Survey Center, and to download it with the EarthExplorer in http://eros.usgs.gov/#/ Find_Data/ Products_and_Data_Available/ SRTM_DTED.

    But, they are 25000 files! So patience, and any trick and I got the information, which was completed thanks to Jonathan de Ferranti, in your web page ViewFinder Panoramas. He has recopilated all the information refering to the planet and has the information updated with the last changes in each one of the patches, not only to the SRTM files but of topographical maps, in other scales, for each country.

    I must to thank to the web page http://www.montipedia.com for the help given, when I've maked the videos, because they have a complete data base with the geographical coordinates where are the mountains, peaks, volcanos, etc, more importants of the world, and thanks to that I've could to go, quickly, to see the places I wanted.

    And now we have to manage this information, for which, the LanDTM program has not limits, but however, we have to have in mind various aspects so that the management is quick to avoid that the data representation would be able to take you hours. I've written a little learning guide for everybody, in the next page, , "Cartographical aspects" where I explain, in such a way that's very simple, the data we go to use as well as the most important aspects to can use the program to the most efficient way.

    To begin to work with the program, the most easy way is to draw the patches of a big zone, and when you see them drawn, bring near you to the liked zone and you do a window, and the program will connect it to internet to download the required information to that bit of terrain you have selected, without you have to do nothing more. After you make the triangulation and contouring, and ready. I've prepared a demo with this and, too, the manual of this part for you can take out the maximum benefit.



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