For some users, KML generation is a key feature of PostGIS, as we can export
live content to our users, with a minimal effort to produce KML compliant
geometries.
However, actual implementation of ST_AsKML function lacks of some important
features of the geometry element:
<altitudeMode>
Specifies how altitude components in the <coordinates> element are interpreted.
<tessellate>
Boolean value (default=0). Specifies whether to allow lines and paths to follow
the terrain. This specification applies only to LineStrings (paths) and
LinearRings (polygons) that have an <altitudeMode> of clampToGround.
<extrude>
Boolean value (default=0). Specifies whether to connect the geometric primitive
(icon, line, polygon) to the ground. Extrusion requires that the geometry's
<altitudeMode> be either relativeToGround or absolute and that within the
<coordinates> element, the altitude component be greater than 0 (that is, in
the air).
This is a proposal for implementing these features into ST_AsKML producer. For
those interested in evaluate and apply them, feel free to add comments in the
Google code space or in the postgis-users list:
http://code.google.com/p/postexperiments/wiki/Extrude_Tesselate_and_Altitudemode_Support
--
Eduin Yesid Carrillo Vega
Ingeniero Civil, Universidad Industrial de Santander UIS
Laboratorio de Biogeografía y Análisis Espacial
Instituto de Investigación de Recursos Biológicos Alexander von Humboldt
[EMAIL PROTECTED]
Cr.13 28-01 P.7
Tel. (+57 1) 3506064 ext 122
Bogotá D.C., Colombia
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