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<html><head><title>OGDI Vectors</title></head><body bgcolor="#ffffff"><h1>OGDI Vectors</h1>OGDI vector support is optional in OGR, and is normally only configured ifOGDI is installed on the build system. If available OGDI vectors are supported for read access for the following family types:<ul> <li> Point <li> Line <li> Area <li> Text (Currently returned as points with the text in the "text" attribute)</ul><p>If an OGDI gltp url is opened directly the OGDI 3.1 capabilities for thedriver/server are queried to get a list of layers. One OGR layer is createdfor each OGDI family available for each layer in the datastore. For driverssuch as VRF this can result in alot of layers. Each of the layers has anOGR name based on the OGDI name plus an underscore and the family name. Forinstance a layer might be called <b>watrcrsl@hydro(*)_line</b> if comingout of the VRF driver. Alternatively to accessing all the layers in a datastore, it is possible to open a particular layer using a customized filename consistingof the regular GLTP URL towhich you append the layer name and family type (separated by colons). Thismechanism must be used to access layers of pre OGDI 3.1 drivers as beforeOGDI 3.1 there was no regular way to discover available layers in OGDI.<p><PRE> gltp:[//<hostname>]/<driver_name>/<dataset_name>:<layer_name>:<family></PRE>Where <layer_name> is the OGDI Layer name, and <family> is one of:"line", "area", "point", or "text".<p>OGDI coordinate system information is supported for most coordinate systems. A warning will be produced when a layer is opened if the coordinatesystem cannot be translated.<p>There is no update or creation support in the OGDI driver.<p>Raster layers cannot be accessed with this driver but can be accessedusing the GDAL OGDI Raster driver.<p><H3>Examples</H3>Usage example 'ogrinfo':<BR> <PRE> ogrinfo gltp:/vrf/usr4/mpp1/v0eur/vmaplv0/eurnasia 'watrcrsl@hydro(*)_line'</PRE><P>In the dataset name 'gltp:/vrf/usr4/mpp1/v0eur/vmaplv0/eurnasia' the gltp:/vrfpart is not really in the filesystem, but has to be added. The VPF data was at/usr4/mpp1/v0eur/. The 'eurnasia' directory should be at the same level asthe dht. and lat. files. The 'hydro' reference is a subdirectory of 'eurnasia/'where watrcrsl.* is found.<P>Usage examples VMAP0 to SHAPE conversion with 'ogr2ogr':<BR><PRE> ogr2ogr watrcrsl.shp gltp:/vrf/usr4/mpp1/v0eur/vmaplv0/eurnasia 'watrcrsl@hydro(*)_line' ogr2ogr polbnda.shp gltp:/vrf/usr4/mpp1/v0eur/vmaplv0/eurnasia 'polbnda@bnd(*)_area'</PRE>An OGR SQL query against a VMAP dataset. Again, note the careful quoting ofthe layer name. <p><PRE> ogrinfo -ro gltp:/vrf/usr4/mpp1/v0noa/vmaplv0/noamer \ -sql 'select * from "polbndl@bnd(*)_line" where use=26'</PRE><h3>See Also</h3><ul><li> <a href="http://ogdi.sourceforge.net/">OGDI.SourceForge.Net</a><p><li> <a href="http://www.terragear.org/docs/vmap0/coverage.html">VMap0 Coverages</a></ul></body></html>⌨️ 快捷键说明
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