Unit 3 – Lesson 2: Create Parcels Civil 3D 2010 Student Workbook ▪ 1 Parcels Overview In this lesson, you learn how to work with sites and parcels in AutoCAD® Civil 3D® software. A site contains design objects such as alignments, parcels, feature lines, and grading groups. Often the site is analogous to the initial parcel from which all subsequent parcel design is generated. A special parcel, known as the right-of-way parcel, represents the parcel of land for a road, also known as a road allowance. Building parcels are subdivided according to design criteria such as minimum area or road frontage. The conceptual design of parcel and road layout forms the fundamental idea of the development. Multiple design alternatives are normally created and evaluated based on many criteria. Objectives After completing this lesson, you will be able to: - Create a site. - Create a ROW parcel. - Describe parcels and their properties. - Create parcels using layout tools. - Create parcels from objects that already exist in the drawing. - Edit parcels. Lesson 2 AutoCAD Civil 3D 2010 Education Curriculum Student Workbook Unit 3: Land DevelopmentUnit 3 – Lesson 2: Create Parcels Civil 3D 2010 Student Workbook ▪ 2 - Renumber parcels. - Label a parcel and create a table. Exercises The following exercises are provided in a step by step format in this lesson: 1. Create a Site 2. Create a ROW Parcel 3. Create Parcels Using Layout Tools 4. Create Parcels from Objects 5. Edit Parcels 6. Renumber Parcels 7. Label Parcel Segments About Sites A site contains design objects such as alignments, parcels, feature lines, and grading groups. Using a site, you can organize design objects in a drawing. In many cases, this site is also the initial parcel from which all subsequent parcel design is generated. You create and maintain relationships among objects by grouping them together in a site. The following illustration shows a site and the objects that make up a typical site. When you create any of these objects, you must specify the site to which it belongs. If you create these objects before you create a site, a site with a default name (for example, Site 1) is created automatically, and the objects are assigned to it. Sites are most often used to organize data. Sites also recognize topology, which refers to the spatial relationships among objects. Objects that are in the same site interact with each other.Unit 3 – Lesson 2: Create Parcels Civil 3D 2010 Student Workbook ▪ 3 More than one site can reside in the same geographic location, but the objects contained in the different sites do not interact. These are some general guidelines to use when working with sites: When working with large amounts of data in a site, use representative naming conventions to help you organize your data. For good data management practices, use sites to organize parcel, alignment, feature line, and grading group data either geographically or by project phase. If you want design objects to interact with each other, assign them to the same site. About Right-of-Way Parcels You create a right-of-way parcel as one of your first tasks for designing a residential subdivision. A right-of-way parcel represents the parcel of land for a road, also known as a road allowance. After the right-of-way is created, you can subdivide the adjacent land parcels into individual lots. The following illustration shows the parameters for a right-of-way parcel. Alignments and Right-of-Way Parcels When an alignment is in the same site as a parcel, and it passes completely through the parcel, the parcel automatically subdivides into two parcels, one on either side of the alignment. You use the Create ROW command to create a right-of-way parcel adjacent to the alignment. You specify offsets and can use fillet or chamfer cleanup options at the alignment intersections and the parcel boundaries. For example, if you have a parcel that represents a boundary survey, and if that parcel is bisected with a road alignment object, the parcel splitsUnit 3 – Lesson 2: Create Parcels Civil 3D 2010 Student Workbook ▪ 4 into two. The Create ROW command then creates a right-of-way parcel for the road allowance based on the user inputting the right-of-way width (offset from the centerline). About Parcels Parcels are created within a site. You use parcels to subdivide sites based on your project requirements, create lots to developer sizing specifications, or explore design alternatives. Parcel objects typically represent real estate parcels, such as lots in a subdivision. You can also use a parcel to represent any feature with closed boundaries, such as bodies of water or soil regions. Parcels are defined by parcel segments, which can be lines or curves. When working with parcels, keep the following information in mind: Parcel objects in the same site are related topologically and are, therefore, dynamic. This means that a change to one parcel creates related changes to the other adjacent parcels in the site. When you create a parcel, parcel area labels are automatically created. Parcel labels typically include a parcel number and area, but can include other information such as perimeter and address. You can create parcels using the layout tools (Parcel Creation Tools) or from AutoCAD® objects. The following illustration shows parcels created for a subdivision.Unit 3 – Lesson 2: Create Parcels Civil 3D 2010 Student Workbook ▪ 5 The dynamic nature of parcels in the same site enables you to quickly and efficiently make changes. For example, when you change the location of a parcel segment, any adjoining parcels automatically update. Or, if you create other parcel segments in the same site that bisect a parcel, the parcel subdivides into two other parcels. The new parcels contain labels appropriate to their location within the site and in the same style as the original parcel. Methods for Creating Parcels The first site is also the initial parcel from which all subsequent parcel design is generated. You can create parcels using the Parcel Layout Tools toolbar, or by using an object in your drawing. If you use the Parcel Layout Tools toolbar, you can select default style settings, create parcels by subdividing, resize parcels, and perform basic object editing. Using Layout Tools to Create Parcels You can use commands on the Parcel Layout Tools toolbar to
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