By Maribeth Price
Getting to know ArcGIS is an introductory GIS textual content that's designed to provide every thing you want to grasp the fundamental parts of GIS. The author's step by step process is helping scholars negotiate the tough projects interested by studying subtle GIS software program. An leading edge and targeted characteristic of studying ArcGIS is its accompanying narrated movies that exhibit scholars precisely the right way to practice bankruptcy tutorials earlier than making an attempt an workout on their lonesome.
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Extra resources for Mastering ArcGIS
Sample text
The difference between a feature class and a layer is important to grasp. A feature class is a stored set of spatial data. A layer points to a feature class and stores information about how to display it and use it (Fig. 14). A layer is like a cooking recipe—it describes where to find the data file (the ingredients) and how to display it (the cooking instructions). The same feature class can be accessed by multiple layers to present different views of the same data, even within a single map document (Fig.
894 degrees Fahrenheit. This measurement would be considered precise. However, imagine that you take the reading immediately after drinking a cup of hot coffee. This action throws off the thermometer reading so that it does not record your true body temperature. Thus, the measurement is precise, but it is not accurate. Evaluating the quality of a data set can be difficult, especially if the data were created by someone else. Professionals who create data usually also provide metadata, which stores information about the data set, such as where it came from, how it was developed, who assembled it, how precise it is, and whether it can be given to another person.
9Î Click on the Fixed Zoom Out button two or three times. It zooms to the next scale. 9Î Practice these tools until you are familiar with them. When finished, click the Full Extent button to return to the full extent of the Oregon data. TIP: Use the Bookmarks menu to set and manage bookmarks to areas of interest. The Identify tool can be used to examine the attributes of a feature. 10Î Locate the Identify tool on the Tools toolbar and click on it. 10Î Place the tool on top of one of the counties, staying away from an airport or a highway, and click on it.