
<section id='BaseOps_AvoidanceAreaChunk_id'
webfilename='avoidanceareachunk'>
    <title>
        Editing Avoidance Areas
    </title>
    <para>
        An <termtext>avoidance area</termtext> is a cylindrical-shaped
        portion of airspace where aircraft operations are prohibited.
    </para>
    <exhibit>
        <img src='BaseOps_AvoidanceArea_Figure.png'
        standard_colors='true'/>
    </exhibit>
    <para>
        Avoidance areas are an integral part of an MRNMap case, denoting
        portions of military operations areas where aircraft do not fly.
        The other noise models do not use avoidance areas, but since flight
        operations are often constrained by them, it may still be useful
        to display them on BaseOps maps: see <iref
        target='BaseOps_AnnotatingMapsWithObjects_id'/>.
    </para>
    <para>
        To work with avoidance areas, choose Avoidance Areas from the
        <link target='#BaseOps_ListPane_id'>object type selector dropdown
        list</link>. Avoidance areas can be added, duplicated, and deleted
        as described in <iref target='BaseOps_ListPane_id'/>.
    </para>
    <para>
        To edit an avoidance area, first select it in the <link
        target='#BaseOps_ListPane_id'>object list</link>, then edit its
        properties in the <link
        target='#WCF_ApplicationMainWindow_id'>text pane</link>.
    </para>
    <exhibit>
        <img src='BaseOps_AvoidanceAreaChunk_ScreenCap.png'
        standard_colors='true'/>
    </exhibit>
    <para>
        Avoidance areas have the following properties.
    </para>
    <unorderedlist>
        [-include "BaseOps_NameLongNameNotes_ListItems.rxl" ObjectTypeName='avoidance area'-]
        <listitem>
            <para>
                <italic>Location</italic> - The location of the center of the
                avoidance area.
            </para>
            <para>
                You can change the coordinate system used to specify locations:
                see <iref target='BaseOps_CaseCoordinateSystem_id'/>.
            </para>
            <para>
                Using the Select and Edit map tool, you can drag the center of
                the avoidance area to another location on the map. See <iref
                target='BaseOps_MouseTool_SelectAndEdit_id'/> for more information.
            </para>
        </listitem>
        <listitem>
            <para>
                <italic>Radius</italic> - The radius of the avoidance area.
            </para>
            <para>
                You can change the units used to specify the radius: see <iref
                target='BaseOps_CaseUnits_id'/>.
            </para>
        </listitem>
        <listitem>
            <para>
                <italic>Ceiling</italic> - The height of the top of the avoidance
                area. [-include "BaseOps_HeightInputControl_UsageSentence.txt"-]
            </para>
            <para>
                Aircraft are permitted to fly over the avoidance area if they
                are higher than the area's ceiling. The bottom of the avoidance
                area is always ground level.
            </para>
            <para>
                You can change the units used to specify the height: see <iref
                target='BaseOps_CaseUnits_id'/>.
            </para>
        </listitem>
    </unorderedlist>
</section>
