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java.lang.Objectgov.nasa.worldwind.servers.wms.generators.BlueMarbleNG500MGenerator
public class BlueMarbleNG500MGenerator
A MapGenerator implementation for serving high-resolution images from NASA's Blue Marble, Next-Generation image series.
It is assumed that the source PNG files for this dataseries, as distributed by NASA, have
been converted to geotiffs, with georeferencing explicitly injected into the files. It is
also highly recommended, but not required, that the geotiffs have a subtiling organization.
All of these steps can be conveniently performed with the GDAL utility gdal_translate
.
This generator also uses the GDAL utility gdalwarp
to extract subregions from
the source images.
The NASA source files have a regular naming scheme that encodes the date and georeferencing information. The files are thus otherwise named with a prefix that indicates the features depicted in the image (topography, bathyrmetry, etc.). The naming scheme looks like:
name_prefix.yyyymm.3x21600x21600.A1.suffix name_prefix.yyyymm.3x21600x21600.A2.suffix name_prefix.yyyymm.3x21600x21600.B1.suffix name_prefix.yyyymm.3x21600x21600.B2.suffix ... name_prefix.yyyymm.3x21600x21600.D2.suffix
The substring "yyyymm" indicates the date of the imagery. The codes A1, A2, ..., D1, D2 reflect an implicit goereferencing. The high-resolution images are distributed as a set of 8 90x90 degree tiles. The "1" indicates northern hemisphere (i.e., the latitude for that image ranges from 0N -- 90N), whereas "2" indicates southern hemisphere (0-90S). The letter codes indicate bounds in longitude:
A = 180W -- 90W B = 90W -- 0 C = 0 -- 90E D = 90E -- 180E
There are several required properties needed in the configuration of the
MapSource
element that reflect the italicized
substrings in the above naming scheme, for the actual filenames of the geotiffs to be served:
<!-- name_prefix --> <property name="BlueMarble500M.namingscheme.prefix" value="..." /> <!-- suffix --> <property name="BlueMarble500M.namingscheme.suffix" value="..." /> <!-- yyyymm --> <property name="BlueMarble500M.defaultTime" value="..." />
Nested Class Summary |
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Nested classes/interfaces inherited from interface gov.nasa.worldwind.servers.wms.MapGenerator |
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MapGenerator.ServiceInstance |
Constructor Summary | |
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BlueMarbleNG500MGenerator()
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Method Summary | |
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gov.nasa.worldwind.geom.Sector |
getBBox()
Returns the bounding-box for the geospatial dataset managed by the MapGenerator instance. |
String[] |
getCRS()
Returns the coordinate-reference systems (CRS) that the MapGenerator is capable of using to generate map requests. |
MapGenerator.ServiceInstance |
getServiceInstance()
Called by the WMS to return an instance of ServiceInstance to field a GetMap request. |
boolean |
initialize(MapSource mapSource)
Gives the MapGenerator implementation an opportunity to perform any needed initialization, prior to fielding GetMap requests. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public BlueMarbleNG500MGenerator()
Method Detail |
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public gov.nasa.worldwind.geom.Sector getBBox()
MapGenerator
getBBox
in interface MapGenerator
public String[] getCRS()
MapGenerator
getCRS
in interface MapGenerator
public MapGenerator.ServiceInstance getServiceInstance()
MapGenerator
getServiceInstance
in interface MapGenerator
public boolean initialize(MapSource mapSource) throws IOException, WMSServiceException
MapGenerator
initialize
in interface MapGenerator
IOException
WMSServiceException
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