WMS:Feature Selection: Difference between revisions

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==Selection by Location==
==Selection by Location==
Users can select features from one or more GIS layers based on their spatial relationship to another layer. The ''Select By Location'' dialog allows users to specify whether to select new features, add to currently selected features, select from selected features, or delete from selected features. In addition, it allows users to specify the layers to be selected from as well as the relationship with the selection layer. Finally, users specify the layer used for selection and whether to use all features or only selected features. A buffer distance can be added to the features of the selection layer.
Select features from one or more GIS layers based on their spatial relationship to another layer. The ''Select By Location'' dialog allows specifying whether to select new features, add to currently selected features, select from selected features, or delete from selected features. In addition, it specifies the layers to be selected from as well as the relationship with the selection layer. Finally, specify the layer used for selection and whether to use all features or only selected features. A buffer distance can be added to the features of the selection layer.


:[[Image:GIS Select by Location.png|350 px]]
:[[Image:GIS Select by Location.png|350 px]]

Revision as of 15:48, 2 February 2016

With ArcObjects enabled three different selection methods are available. However, before attempting to select layers users should make sure that the layer(s) to be used are selectable. By default a layer is selectable when opened, but the status can be changed to unselectable using the Selectable Layers command in the Selection menu.

Graphical Selection

The Select Features tool can be used to interactively select features from GIS layers. When selecting using graphical selection all features from all selectable layers will be added to the selection list. A rectangular box can be dragged around a region of interest and then all features from all selectable layers that have in part within the rectangle will be added to the selection list.

The Options command is used to specify how features are selected and the way they are displayed.

GIS Selection Options dialog.

Selection by Attribute

Features of a layer can also be selected based on a query of the attributes and their values. The Query Wizard is used to choose the layer the user wishes to select from and the way the query results will be treated. The query can create a new selection, add to the current selection, remove from the current selection, or select on from within currently selected features.

GIS Query Wizard first step.
GIS Query Wizard second step.
GIS Query Wizard third step.

Selection by Location

Select features from one or more GIS layers based on their spatial relationship to another layer. The Select By Location dialog allows specifying whether to select new features, add to currently selected features, select from selected features, or delete from selected features. In addition, it specifies the layers to be selected from as well as the relationship with the selection layer. Finally, specify the layer used for selection and whether to use all features or only selected features. A buffer distance can be added to the features of the selection layer.

GIS Select by Location.png

Clearing Selected Features

The Clear Selected Features command clears all features from the selection list.

Related Topics