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Howto:Create custom terrain: Difference between revisions
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Before you begin, please make sure the area you want to improve doesn't already have good coverage. Just because it looks bad in FlightGear does not mean the area has not been improved. For this, you will need to check the Flightgear Mapserver, at [http://mapserver.flightgear.org/ mapserver.flightgear.org]. | Before you begin, please make sure the area you want to improve doesn't already have good coverage. Just because it looks bad in FlightGear does not mean the area has not been improved. For this, you will need to check the Flightgear Mapserver, at [http://mapserver.flightgear.org/ mapserver.flightgear.org]. | ||
Let's take a look at the Finistère in Brittany, Western France: if you click [http://mapserver.flightgear.org/map/?lon=-4.41840585539649&lat=48.4484146908477&zoom=11&layers=0B000000FTTFFFFFTFT here], you will quickly see and understand how the Finistère county | Let's take a look at the Finistère in Brittany, Western France: if you click [http://mapserver.flightgear.org/map/?lon=-4.41840585539649&lat=48.4484146908477&zoom=11&layers=0B000000FTTFFFFFTFT here], you will quickly see and understand how FlightGear interprets the data pertaining to Finistère county. Some towns/cities (red), a few forests (green), etc. Overall, it is not a very good resolution: a lot of angles, the detail level is not that good, some towns are missing. If you want a better definition on ground, there is some work to be done! The goal being to obtain something like this: | ||
# [http://mapserver.flightgear.org/map/?lon=13.40385&lat=52.50199&zoom=11&layers=B0000000TFFFTFFFTFFFFFFF Berlin] | # [http://mapserver.flightgear.org/map/?lon=13.40385&lat=52.50199&zoom=11&layers=B0000000TFFFTFFFTFFFFFFF Berlin] | ||
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# Modify the filter to search for *.tif files. | # Modify the filter to search for *.tif files. | ||
# Add the TIFF file you have just downloaded. | # Add the TIFF file you have just downloaded. | ||
# Rightclick on the image in the layer sidebar and choose <tt>Set layer CRS</tt>, to select a projection model. This depends on the location of the area you're about to create. Look up your project's UTM coordinate through [http://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg this image]. For Texel this is 31U, north of the equator, so we choose <tt>Projected Coordinate Systems > Universal Transverse Mercator (UTM) > WSG84 / UTM zone 31N</tt>. Always select 'WGS84', as that is the globe model used in FlightGear. | # Rightclick on the image in the layer sidebar and choose <tt>Set layer CRS</tt>, to select a projection model. This depends on the location of the area you're about to create. Look up your project's UTM coordinate through [http://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg this image]. For Texel this is 31U, north of the equator, so we choose <tt>Projected Coordinate Systems > Universal Transverse Mercator (UTM) > WSG84 / UTM zone 31N</tt>. Locations south of the equator may need to use the 'N' zones as well. For example, the correct projection for Perth, Australia is <tt>Projected Coordinate Systems > Universal Transverse Mercator (UTM) > WSG84 / UTM zone 50N</tt>. Always select 'WGS84', as that is the globe model used in FlightGear. | ||
# Click on <tt>Layer > New > New Shapefile Layer</tt> or on the corresponding icon. A dialog should pop up. | # Click on <tt>Layer > New > New Shapefile Layer</tt> or on the corresponding icon. A dialog should pop up. | ||
## Make sure the vector type is set to polygon. | ## Make sure the vector type is set to polygon. | ||
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* [http://wiki.qgis.org QGIS Wiki] | * [http://wiki.qgis.org QGIS Wiki] | ||
* [http://wiki.osgeo.org/wiki/LandcoverDB_CS_Detail OSGEO Wiki] | * [http://wiki.osgeo.org/wiki/LandcoverDB_CS_Detail OSGEO Wiki] | ||
* | * {{forum link|t=5566|text=Editing shapefiles for inclussion in official scenery}} (forum topic) | ||
=== Resources === | === Resources === | ||