20
Copyright © 2014 Open Geospatial Consortium
This approach also introduces potential performance issues or requires a high- performance WFS. If the regions are small then often many will be visible at the same
time, resulting in potentially a large number of parallel requests to the WFS. On the other hand, if the regions are large, a single request may take too long and degrade the user
experience.
5.5.3 Representation in the “Places” tree in the Google Earth client
The Topographic Data Store TDS application schema consists of a large number of feature types 100. Typically, a user may simply want to select a subset of all feature
types to be visible. Considering that the TDS contains a two-level package hierarchy of the features types, the natural solution would be mapping the UML packages to KML
folders. A shorted example of the resulting KML structure:
kml xmlns=http:www.opengis.netkml2.2 Document
nameNAS Profile OWS-7 Haiti Geodatabase Schemaname visibility1visibility
open1open descriptionThis geodatabase schema defines the logical content for
Topographic Feature Data in the U.S. National System for Geospatial- Intelligence NSG. [desc] It specifically addresses selected ISO standards for
modeling features and surfaces coverages, drawing on relevant military standards, specifications and profiles established by the Defence Geospatial
Information Working Group DGIWG.description Snippet maxLines=0
Folder nameCulturalname
visibility1visibility open0open
descriptionInformation about features on the landscape that have been constructed by man. [desc] Excepted are the view groups Transportation,
Ports and Harbours, Population, and their related features.description Snippet maxLines=0
Folder namePower Generation and Transmission Facilitiesname
visibility1visibility open0open
descriptionThe buildings, non-building structures, and equipment necessary for the production and distribution of electric power. [desc] The
power plant converts fuel to mechanical energy, which drives generators and produces electricity. The main methods of generation are thermal energy using
steam driven turbines, hydroelectric using water pressure to drive turbo generators and internal combustion direct conversion of mechanical to
electrical energy. The power distribution grid starts at the power plant and ends with the subscriber. Networks of power transmission lines, carried on
transmission line pylons, transmit the electricity from the power plants through the substations and transformer yards to the customer.description
Snippet maxLines=0 NetworkLink
nameTilesname visibility1visibility
open0open refreshVisibility0refreshVisibility
flyToView0flyToView Region
LatLonAltBox north20.0north
south17.0south east-65.0east
