About-Selecting-Objects-for-Data-Extraction

About Selecting Objects for Data Extraction

    About Selecting Objects for Data Extraction

    You can select objects, including blocks and their attributes and drawing property
    information, from which to extract data.

    After you have selected the drawings from which to extract data, the next step is
    to specify which objects and their properties to extract. This is the data that is
    output to a table or to an external file. By default, objects are extracted from both
    model space and paper space, including objects in blocks and xrefs. Using the Data
    Extraction – Additional Settings dialog box, you can change the default settings.

    The Select Objects page in the Data Extraction wizard displays a list of objects.
    From this page, you can use filters to sort by object type (block or non-block). You
    can narrow the list of objects even more. For example, you can display only those
    blocks that have attributes.

    Objects and their properties are always extracted using the world coordinate system
    (WCS).

    Select Object Properties to Be Extracted

    After you have selected the objects, the next step is to specify which properties
    to extract.

    The Select Properties page in the Data Extraction wizard displays a list of properties
    in columns from the selected objects from the Select Objects page. This is where you
    make a final selection of the properties from which data will be extracted and output
    to a columnar format. Using predefined category filters such as general, geometry,
    or attribute, you can narrow the property list.

    Property Categories for Filtering a Data Extraction

    Extracted properties are categorized for easier filtering. For example, if you wanted
    to see only those properties pertaining to geometry, select the Geometry filter on
    the Select Properties page.

    The following is a list of the filter categories for the extracted properties displayed
    on the Select Properties page. The categories include

    • 3D Visualization. Materials.
    • Attribute. Attribute tags.
    • Drawing. File name, location, size, when created and modified.
    • Dynamic Block. Dynamic block properties.
    • General. Color, hyperlink, layer, linetype, and so on.
    • Geometry. Area, start point, end point, radius, and so on.
    • Misc. Dimension style and block name.
    • Pattern. Hatch pattern name, angle, scale, spacing, and so on.
    • Table. Table style.
    • Text. Single line text, multiline text, dimension text, and so on.
    NOTE: The category filters on the Select Properties page are the same categories that display
    in the Properties palette.

    Property Names

    After the property data is extracted, the default property names are used as the column
    labels in the data grid (example: Width, Length, Area, and so on). You can change
    these property names so that column labels are replaced with a name you specify. For
    example, if you extracted the length property of lines, but the column label needs
    to indicate the data refers to distance, you can change Length to Distance on the Display Name column on the Select Properties page.

    The display name for the length property for polylines is renamed Distance.

    Property Data and Unit Settings

    If you select multiple drawings as the data source, and the unit setting is not the
    same in all the drawings, a message displays that there is a mismatch of drawing units.
    In this situation, the current drawing’s unit settings are used for converting the
    numerical value of properties.

    For example, if the current drawing’s unit setting is set to inches, and another drawing’s unit setting is set to millimeters, the extracted numerical data is automatically converted to inches. This happens
    even if the current drawing is not included in the data source.

    Property Types

    Each property value is treated as either text or numerical data. For example, properties
    such as radius or length, are treated as numerical data. Attribute numerical values
    are treated as text. This is important to consider when using formula columns to perform
    arithmetic functions on extracted data.

    Non-Uniformly Scaled Blocks

    Objects in blocks that were not scaled uniformly cannot be extracted because the
    numerical values may not be correct or useful. For example, if a circle is in a block
    that was inserted with a non-uniform scale factor, the object is no longer a true
    circle.

    A dialog box will display during the extraction that indicates blocks were found that
    were not uniformly scaled, and the objects within those blocks are not included in
    the extraction.

    Annotative Objects

    The property data for annotative objects is extracted using the current annotation
    scale setting.

    Learning AutoCad

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