GPVLayer

The GPVLayer table links layers in ArcGIS Server or ArcIMS with the various layer-oriented database functions defined in other configuration tables. A GPV layer can be associated with layers of the same name in different map services as long as those layers all contain the same key field.

Columns

• LayerID - The unique ID of this layer in the GPV (not null). Links to GPVMapTabLayer, GPVLayerProximity, GPVLayerFunction, GPVDataTab and GPVQuery.
• LayerName - The name of the layer in the map service associated with this GPV layer (not null). Note that the map service layer name, not its ID, is the link between the map service and the GPV.
• DisplayName - The name of the layer as it should appear to the user. If null, defaults to LayerName.
• MetaDataURL - A URL which leads to metadata about this layer. If set, the layer name in the legend will display as a link to this page.
• KeyField - The field containing feature IDs in the map service layer.
• ZoneField - The field containing zone IDs in the map service layer.
• LevelField - The field containing level IDs in the map service layer.
• MaxNumberSelected - The maximum number of map features that can be selected on this layer. If null, any number of features can be selected. Max number of features selected can also restricted by the map server.
• MaxSelectionArea - The maximum area of the box that can be used to select map features, in map units. If null, any size box can be used for selection.
• MinNearestDistance - A number specifying the first and smallest buffer distance to use in a nearest features search on this layer. If null, defaults to 100 map units.
• MaxNearestDistance - A number specifying the largest buffer distance to use in a nearest features search on this layer. If null, defaults to the width or height of the full extent of the map, whichever is largest.
• Active - Specifies whether this layer will be available for use, 1 for yes and 0 for no. If null, defaults to 0 (no).

Setting MinNearestDistance and MaxNearestDistance

The MinNearestDistance and MaxNearestDistance values control the search for nearest features on the target layer. An initial buffer of MinNearestDistance is generated around the selection features. If target features are found in the buffer, distances to each are calculated. Otherwise the buffer distance is increased until target features are found or MaxNearestDistance is attained. Set MinNearestDistance to approximately half the average distance between the features on the layer if they are widely separated, or half the average width of the features if they share edges (such as parcels). Setting MinNearestDistance improperly can cause the nearest feature search to perform poorly.

Deactivation

Deactivating a layer will automatically deactivate all queries, data tabs and layer functions associated with the layer. It will also deactivate all proximities that are solely dependent on the layer.

Changes

• Removed at 5.0 BaseMapID - The previous base mapping capabilities have been replaced with support for tiled image layers.