Featured TUTORIAL Getting Danish landscape information Tutorial Part 1

Discussion in 'Tracks' started by DanTDBV, Mar 26, 2016.

  1. DanTDBV

    DanTDBV Member

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    There are multiple types of data, helpful to the trackbuilder available from the Danish government.

    Such as DHM (The Danish Height model) and Orthophotos (airplane photos). DHM consists of LIDAR, that is LAS pointclouds compressed into LAZ files, different kinds of ASC surface models and large GEOTIFF images.

    I will do another tutorial on getting the Orthophotos to keep this tidy.

    The Danish data is downloadable from here:

    http://download.kortforsyningen.dk/

    The requirements for using the data, is to at someplace mention the name of the dataset, the download date and where it comes from.

    I use this:
    Copyright notice Padborg Park Point cloud and Ortho photo
    As required, according to this site: (In Danish)
    http://download.kortforsyningen.dk/content/vilk%C3%A5r-og-betingelser
    Contains data from Geodatastyrelsen and Danske kommuner Fot-data
    Ekstracted lokation : Padborg Park
    DHM/Point cloud
    DLD 24/3-2016 punktsky_607_51_LAZ_UTM32-ETRS89.zip
    DLD 24/3-2016 punktsky_608_51_LAZ_UTM32-ETRS89.zip
    http://download.kortforsyningen.dk/content/geodataprodukter
    DLD = Download date
    DanTDBV D@nN (My photo and film signature)

    You need to register before you can download anything.

    Kortforsyningen LIDAR.jpg

    • In the Log ind box chose Opret ny bruger

    • Enter your information in the relevant boxes

    • You only need to check the top checkbox.

    • Click Opret ny bruger
    I cannot remember the rest of the registration proces, and I am not to keen on registering again.

    If in doubt post a screenshot and I will help you out.


    You do NOT! Need to logged in, to browse around in the data.


    For LIDAR data
    Click Gå til DHM link DHM = Danmarks HøjdeModel = Denmarks Height Model

    The different links sends you to a page, with a description you can copy to translate.

    Current dataset with trees and buildings is DHM/Punktsky

    Kortforsyningen DHMPunktsky.jpg

    http://download.kortforsyningen.dk/content/dhmpunktsky

    The looking glass is a search function you can use in all 3 steps. You can search for streetnames and places. You can even find the permanent Danish racing tracks. (Hint! Motorbane is a racingtrack).

    In step 1 and 2 you can leftclick and drag the map around and zoom with the scrollwheel.

    I am downloading Padborg Park in this session.

    Kortforsyningen DHMPunktsky 1.jpg


    1. Udtræksmetode

    V 10 km blokke, is saying that each selection, is a 10 km square. In some of the sections, you can select smaller chunks. It is a new function and I have not tried it yet.

    Use the map to find the area you are interested in.

    When you can see the desired area Click Næste

    Kortforsyningen DHMPunktsky 2.jpg


    2. Format og koordinatsystem

    Format (Chose file format)
    Koordinatsystem (Chose coordinate system)

    If you don't get any choises, click Næste

    Kortforsyningen DHMPunktsky 3.jpg


    3. Vælg område på kort

    Click on the areas that you need
    You multiselect by clicking the next area.

    Selected datasets show up in the sidebox.

    Click again to deselect.

    If you cannot select anything, then it means there are no data, for that area yet.

    Kortforsyningen DHMPunktsky 4.jpg

    You can skip step 1 and 2, if you know that selection, format and coordinate system is to your liking and do your search in step 3.

    When you have chosen what you need:

    Click Læg i kurv

    You get a list with the filesets you have selected

    punktsky_607_51_LAZ_UTM32-ETRS89.zip
    punktsky_608_51_LAZ_UTM32-ETRS89.zip

    Click Gennemfør bestillingen

    Log in (When you have logged in once and have asked you browser to remember you, you just need to click on fortsæt to log in.)

    Click downloade din ordrer her

    Rightclick and Save as

    I chose to add the name of the area, I want to extract from the files and the downloaddate.

    Padborg Park 24032016 punktsky_607_51_LAZ_UTM32-ETRS89.zip
    Padborg Park 24032016 punktsky_608_51_LAZ_UTM32-ETRS89.zip


    Each zip file contains a number of 1km square laz files. To find which files to use we go to:

    http://miljoegis.mim.dk/cbkort?

    Miljøgis.jpg

    Enter the name of your area in the search field.

    In some cases like Nisseringen and Jyllandsringen, that is enough.
    In others like Padborg park, you will need to find the adress, for the place or one close to it.

    The adress for Padborg Park is Flyvepladsen 10, 6330 Padborg

    Click Ortofoto in the left collum

    Click the buttons on the right side until the map turns into an airphoto

    Click Værktøjer/Chose Vis Koordinater og lokaliser position

    Now click on the 4 corners of the area that you are working with in turn and look at the coordinates you get here:
    Koordinater i ETRS89 /UTM zone 32N

    For Padborg Park it is roughfly
    517629.33 6080487.64
    517951.73 6080507.64
    517343.73 6079933.24
    517602.13 6079852.44

    Our real interest here is the underlined numbers, it teels us the files to use.

    PUNKTSKY_1km_6080_517.laz from set punktsky_608_51_LAZ_UTM32-ETRS89.zip
    PUNKTSKY_1km_6079_517.laz from set punktsky_607_51_LAZ_UTM32-ETRS89.zip

    In this case it is 2 files.

    This should be enough to get you going.

    If you have any questions please ask and I will try my best to answer.

    Happy track building.
     
    Last edited: Mar 26, 2016
    luchian likes this.
  2. luchian

    luchian Administrator Staff Member Pilot RLR

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    Again, thanks @DanTDBV for this info ! I can't wait to have a chance to give all these a try !

    What a great time to be a track modder. I'm thinking back in the day, as an enthusiast you needed to do extensive research and even more approximation. Nowadays, even google is a good starting point - but with THIS ^^ oh man.. so cool !
     
  3. Rune Hansen

    Rune Hansen New Member

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    Hello is it possible to just import the downloaded maps into an editor and it works?
     
  4. AccAkut

    AccAkut Active Member

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    If you mean a 3D modelling tool, nope. Needs a conversion step in between to make the data usable
     
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