Tabular data that describes the characteristics of or , for example, the number of lanes and pavement-type belonging to a road. For features, attributes can be stored with the geometry, or stored in a database and joined to feature data. For drawing objects, attributes are stored in a database and linked to selected drawing objects. See also , and .
For contours that contain curves, the bulge value is a maximum mid-ordinate distance along a polyline curve. If the mid-ordinate distance is longer than specified, then points are added to better define the shape of the curve.
Short for Coordinate Geometry. COGO inquiry commands extract geometric information from drawing objects such as lines, curves, closed polylines, and polygons. This information is useful if you want to verify the accuracy of your data, or send the data to the field. Inquiry commands are specific to drawing objects. They do not work on features.
Data that can fall anywhere in a broad range. When creating a theme, continuous data is usually organized into smaller ranges that show data trends. For example, property value is continuous data that can be placed into the ranges 0 to $50,000, $50,000 to $100,000, and over $100,000, with each range displayed in a different color. Compare with .
Locations with established latitude and longitude, and often elevation, used for accuracy and precise location of maps. A system of geodetic control points covers the entire United States. Similar systems exist for all countries, such as Bench Marks and Trigonometry Points in the United Kingdom. See also , .
In , a collection of feature classes contained in a single storage location. The data store consists of an integrated set of objects, which are modeled by classes or feature classes defined within one or more schemas. Data stores can be either file-based, such as SDF, or a database, such as Oracle Spatial. See also and .
An automatic calculation used to specify values for URL, tooltip, and feature labels. For example, you might create a text expression that specifies a state name and population for a label. To express the population in millions, you might apply a number expression that divides the population value by 1,000,000.
An abstraction of a natural or man-made real world object. A spatial feature has one or more geometric properties. For example, a road feature might be represented by a line, and a hydrant might be represented by a point. A non-spatial feature does not have geometry, but can be related to a spatial feature that does. For example, a road feature may contain a sidewalk feature that is defined as not containing any geometry. In AutoCAD Map 3D, features are accessed and added to maps using Data Connect (). See also . Compare to .
In AutoCAD Map 3D, any source of feature data that has been connected by means of . In MapGuide Studio, one of the two types of resources created either by loading file-based data or by connecting to a spatial database. Feature sources are stored in the repository either in SDF 3 format or as database connections and contain raw geometry only. Compare with .
Content Standard for Digital Geospatial Metadata. A standard XML schema for publishing and sharing GIS , released by the United States Federal Geographic Data Committee (FGDC) in 1998. The schema is comprised of seven major sections, each of which contains several individual data elements and compound elements. Depending upon the nature of the GIS data, each section, element, and compound element is mandatory, optional, or conditional (mandatory if applicable).
A method that converts the spherical coordinates of the Earth representing latitude and longitude into an AutoCAD Map 3D drawings Cartesian coordinate system, and accounts for the curvature of the surface of the Earth with a projection. A coordinate system is usually defined by a projection, an ellipsoid definition, a datum definition, one or more standard parallels, and a central meridian.
To make all or part of a disk file read-only so that it cannot be modified by other users on a network. Object locking applies to objects that are being edited by another user. File locking applies to entire files, for example when an AutoCAD user wants to open a file while the file is being edited in AutoCAD Map 3D.
All the drawing objects that have been created using a specific object class definition. Use object classification to organize objects in your drawing based on the real-world features they represent, such as roads. Object classes allow you to create new objects that automatically have the appropriate properties and values for objects in your drawing. See also .
A polygon is a closed area that stores information about its inner and outer boundaries, and about other polygons nested within it or grouped with it. In a polygon topology, the polygon can be enclosed by any lines or arcs in the drawing. In addition, AutoCAD Map 3D supports a polygon object, sometimes called an or mapping polygon.
The property whose value uniquely identifies each feature within a feature class. Many feature classes use a single property for this purpose, for example, FeatureId. However, a feature class could have a list of properties such as street number, street name, and street type to uniquely identify a house address. You cannot edit primary key values for joined data.
A feature theme consists of a collection of rules. Each rule specifies a style and feature label for the features that meet the specified condition. You can add a legend label to provide a description of the condition of a rule. As a layer is drawn, each is compared to the rules in the order that they are listed. The first rule for which the feature meets the condition is used to specify the style and feature label for that feature.
The ratio of the distance on a paper map to the distance on the ground. If a paper map has a scale of 1:100,000 (also represented as 1/100000), then a distance of 1 unit on the paper map corresponds to 100,000 units on the ground. On a digital map, scale represents the scale of the map from which the digital map was derived.
The process of understanding, extracting, or creating information about a set of objects. Spatial analysis includes techniques used to determine the distribution of objects over a network or area, and the relationships between those objects. The location of, proximity to, and orientation of objects can be analyzed with spatial analysis. It is useful for evaluating suitability and capability, for estimating and predicting, and for interpreting.
Add vertices along 3D polylines that are long and contain few vertices. The supplementing distance is the maximum distance between vertices. If the distance between vertices is greater than specified, then points are added along the 3D polyline in equal increments that are less than or equal to the supplementing distance. The smaller the distance, the greater the number of supplemented points.
A network of elevation data. AutoCAD Map 3D supports raster-based grid surfaces, such as DEM, DTED, and ESRI Grid. In these types of surfaces, the points of a surface are connected into a grid, which are then used to interpolate contours, and to generate profiles and cross-sections. A surface represents the ground condition at a particular time or event.
A AutoCAD Map 3D window that provides the tools you require to accomplish your main mapping tasks: creating, displaying, styling, analyzing, and publishing maps. The Task Pane contains tabbed views: , , Survey, and . Map Explorer enables you to manage the resources you use to create your maps. Display Manager provides tools to create maps, and create styles and themes. With Map Book, you can print, publish and share maps. You can resize and move the Task Pane palette.
A theme is a special style used to vary the stylization based on some property of the objects. For example, instead of just coloring the lakes blue, you could vary the shade of blue based on the depth of the lake. Instead of just altering the line width of the roads, you could vary the line width based on traffic flow.
A set of geometric relationships between drawing objects, including links, nodes, and centroids. Topology describes how lines, nodes, and polygons connect and relate to each other, and forms the basis for advanced GIS functions such as network tracing, spatial analysis, buffer analysis, overlay analysis, and dissolving a polygon topology.
You can use the weeding factor settings to reduce redundant points along 3D polylines by ignoring vertices that are close together or along a straight line. A larger distance and deflection angle will weed a greater number of points. Distance is an absolute measure and the angle is measured in degrees. The larger the distance value, the greater the number of weeded points. The weeding factors must be less than the supplementing factors.
A point is weeded by calculating its location in relation to the vertices before and after it. If the length between these three points is less than the weeding length value, and the deflection angle is less than the weeding angle value, then the middle point is not added to the contour data file.
Contains the commands and tools for specific tasks. The Tool-based Ribbon workspace is tailored to those familiar with the AutoCAD ribbon, while the Task-based Ribbon workspace is optimized for working with AutoCAD Map 3D.