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TerraGear GUI

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| initialrelease = March 24, 2009
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Since March 2009 a '''GUI Tool ''' tool for '''[[TerraGear]] ''' is available at [http://www.flightgear.org/forums/viewtopic.php?p=30238#p30238 the forum]. This tool makes the use of commandlines redundant, through which it's easy to use for everyone not known with commandlines.
=Manual=
Create a <tt>TerraGearWork/</tt> folder somewhere on your computer and inside that folder create the following three more namedfolders inside that one:* '''Data/''': used to collect the raw unprocessed data we need to feed the tools.* '''Output/''': used at the very end and is where your newly processed scenery is finally stored.* '''Work/''': we will keep the files and folders here we will be generating with the TerraGear Tools.
==Obtaining data==
*'''SRTM-1''': Highly accurate 1-arcsecond resolution data, for the USA.
*'''SRTM-3''': Less accurate 3-arcsecond data, for the rest of the world.
From now on, we’ll we will assume that you are using SRTM-3 data. Unless otherwise noted, the process for SRTM-1 is identical. You can get download appropriate data at ftp://e0srp01u.ecs.nasa.gov/srtm. You want all .hgt.zip files covering your region of interest. Depending on the size of your scenery, there may be quite a few. Make sure you download ALL the ones which cover your area of interest. Create a new folder in your <tt>TerraGearWork/Data/</tt> folder called <tt>SRTM-30/</tt>. Download the .hgt.zip files there. The reason why the directories are called SRTM-30 is because genapts will look for a few known, hardcoded directories in it’s working directory. SRTM-30 is one of them and this is the least confusing in that list.
Create a new folder in your <tt>TerraGearWork/Data/</tt> folder called <tt>SRTM-30/</tt>. Now download appropriate data from ftp://e0srp01u.ecs.nasa.gov/srtm. You want ALL .hgt.zip files covering the area you want to create. Depending on the size of your scenery, there may be quite a few. The reason why the directories are called SRTM-30 is because genapts (a tool we will meet further on) will look for a few known, hardcoded directories in it’s working directory. SRTM-30 is one of them and this is the least confusing in that list. Unzip all of the .hgt.zip filesusing your favorite software.
===Land use data===
The final piece of data we need to generate download is the land-use data. In general, this is taken from the VMAP0 dataset as shapefiles from the scenery database mapserver, but other sources can be usedas well. The landuse data can be split into a number of different types:
*'''Landmass''': separates the land from the sea. It is used as a mask for all other data. The most common used is the VMAP0 Landmass, but GSHHS can be used as well.
*'''Land use data''': defines whether a piece of land is forest, urban, sand, lava, glacier etc. These are usually VMAP0 data, defined as polygons.
*'''Line data''': includes railroads, streams, roads. Typically VMAP0, but also [http://www.openstreetmap.org Open Street Map] for roads.
*'''Point data''': currently only used for defining towns.
By far the easiest way to get this data is to download shapefiles from the [http://mapserver.flightgear.org FlightGear Mapserver]. This webpage provides access to a database of information, and allows you to download the specific shapefiles for your scenery area. Click on the Download Shapefiles link, enter in the bounding box of the scenery you want to generate, select the shapefiles you want, and click download. For your first scenery generation, you want all of the ones listed under VMap0 (with prefix v0_). Download each of them into a seperate Data/Shapefiles directory. The v0_landmass shapefiles goes into a <tt>Data/Shapefiles/v0_landmass/</tt> directory for example and v0_urban should be downloaded into <tt>Data/Shapefiles/v0_urban/</tt>.
You can load these shapefiles into a GIS editor such as QGIS or GRASS to view and edit. This is a good idea to verify you have the correct files! There is a Fantastic Tutorial by John Holden which shows you how to create your own shapefiles here.[http://stattosoftware.com/flightgear/tutorial/index.html a tutorial available] written by John Holden which shows you how to create your own shapefiles. Later on, you can experiment with replacing various shapefiles with other versions (GSHHS for coastline, OSM for roads etc.).
==Using the GUI==
As you Now we can see, if finally launch the <tt>TerraGear Toolset GUI.exe</tt>. If you click on the Tools button the list of available tools is will be shown. They are in order of use if we were to start from the beginning of the processThe first tool will be needed first, then the seconds and so are they in this on. This manualfollows the same steps.
===HGTchop===
The HGTchop tool uses the .hgt.zip files you have downloaded earlier on and converts it into a form that FlightGear can read. We First we need to first create yet another folder, this time under the it's <tt>Work/</tt> directory call <tt>SRTM-30/</tt>. This is where the The processed data will be output tothis folder, if you set the correct Output path.
Select the first .hgt.zip file and click the Start button. A command box will open and you will see the tool working away. It will produce numerous .arr.gz files which is quite rough data and requires more refinement with Terrafit(see below). At the moment you need to repeat this step for every file in your <tt>Data/SRTM-30/</tt> folder.
At the moment you need to repeat this step for all the files in your <tt>Data/SRTM-30/</tt> folder. Once completed we can move onto the next tool.
===Terrafit===
The Terrafit tool is used to process the .arr.gz files that you just created into a more refined data. The data collected so far would show flat land and requires more work, so lets use Terrafit to enhance our data.
The three boxes Min Points, Max Points and Max Error can be left blank, unless you are an advanced user. The tool currently uses the default setting for these figures which are sufficient for use in FlightGear. with this tool Now simply use the browse button to point the tool at to the <tt>Work/SRTM-30/</tt> folder where the .aar.gz files are stored. Press the Start button and Terrafit will extract .fit files which has converted converte all our data to the correct elevation data required, leaving .fit files in the <tt>Work/SRTM-30/</tt> folder.
===Genapt===
What is scenery without airport in a flight simulator? If your tile does not contain any airports, you can skip this part of the manual on continue with [[#ogr-decode|ogr-decode]]. First create a folder in the <tt>Data/</tt> called <tt>Airports/</tt>directory. Locate Then locate FlightGears <tt>apt.dat .gz</tt> file , which is usually in <tt>[[$FG_ROOT]]/Airports/</tt>.Copy this file to your newly created Airport <tt>Airports/</tt> folder (. Unzip the file before you will need continue. Use the upper browse button to unzip it) Once locate your, just unzipped, apt.dat file. In the second box, use the browse button to locate your <tt>Work/</tt> folder. If you only want to create the scenery for a specific airport you have completed this we can use enter the ICAO name into the relevant field. If you want to create a larger piece of scenery you can also enter min/max lat and lon co-ordinates. If you do not enter any information in any of the boxes, the tool will run through the entire apt.dat file, which can take a long time. Click the Start button. Genapts Toolwill create two sub-directories in your <tt>Work/</tt> directory, namely AirportArea and AirportObj. These define the definitions of the airport layout and any objects present (e.g. windsocks and beacons). Right, that’s the airports sorted out.
===ogr-decode===
So this is what we need to begin. A shapefiles directory in your <tt>Data/</tt> folder. Then for each of the different shapefiles you are going to create a folder with that name in the <tt>Work/</tt> directory. see the image below for example.
 
===fgfs-construct===
The fgfs-construct tool brings all your gathered data together, throws it in a washing machine and spits it out the otherside in format ready for use with FlightGear.
 
Using the Browse button, select the <tt>Work/</tt> directory. Then select the <tt>Output/</tt> directory we created at the start of the manual. The next two fields are for the centre of the area you have chosen. The next two fields are the outward distance from the centre in degrees. If you click on the Get Folders button it will populate the empty field with all the folders in your <tt>Work/</tt> directory. Highlite them all, holding Shift and clicking the first and last items in the list.
 
Press Create Scenery to fianlly generate your scenery. This may take a long time depending on the size of the area you are creating the scenery for and the level of detail in your shapefiles. Simple and small sceneries will take a couple of minutes, where larger, more detailed areas can take over an hour! So trying new things on small areas first will save you a lot of time.
 
The folders and files in the <tt>Output/</tt> directory are ready to use scenery. You can set the scenery path of FlightGear to this directory to check if the scenery is generated correctly.
[[Category:Scenery enhancement]]

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