Lab 5 Digitizing

 Exercise 13A 

Exercise 13B

Definitions of the Key Words from Chapters 11, 12. 13

Feature Dataset- a dataset that has related feature classes that can be grouped together

For example, we have a shapefile with streets and we combined that dataset with a shapefile that has all stop signs as points. This would create a new feature dataset.

Attribute Domain- established and enforces valid values or ranges of values for an attribute field

This would be used to fix the correct values that can be inputted for a attribute. For example, if we were talking about computers being occupied the two domains would be occupied or vacant and no other values could be put into the attribute.

Digitizing- drawing on top of maps, aerial, or satellite images with digital devices

For our class, we use digitizing on the computer and trace on aerial photographs, scanned maps, and other spatial data.

Vertex- points that define a line or a polygon

An example of this would be when we are tracing polygons, we plot vertices around the polygon to create a shape.

Endpoints- points that mark the end of a line segment

We use endpoints when we are drawing lines such as streets from point A to point B. Endpoints are also used when polygons are drawn using the editing tool.

Edge- segments between vertices

The edge is used when we are drawing polygons. They are also the sides of the polygons.

Edit Sketch- this is before a feature is saved when drawing a polygon or during an edit session

This is when the polygon you have drawn is highlighted in blue in ArcMap.

Edit Session- when you click start editing and in this mode one can add features or modify features

Edit session is used when we want to trace around features for example in these lab exercises we used it to trace around playgrounds.

Snapping- editing operation where points or features within a specified distance are moved to match with each other’s coordinates

We use snapping to only show features where we are currently working or looking at. For example, during chapter 12 we were only looking at streets that were relevant to what we were doing.

Map Topology-temporary set of topological relationships between parts of simple features on a map that will behave as if they are connected

We used map topology in chapter 13 when we changed the boundaries of the neighborhoods because when we moved that edge it changed the shape of both polygons where the edge was touching.

Geodatabase Topology- arrangement that constrains how point, line, polygon, features share geometry, allows you to enforce rules within and between feature classes

You can use this to manipulate maps to be exactly how you want by enforcing rules. An example would be that you want all your lines to be connected. This is a faster way to ensure that your map will be the product you want.