Geog 206
1.) There are four types of software products included in ArcGIS and these are Desktop GIS, Server GIS, Online GIS, ESRIData and Mobile GIS. Most of the time, in this course, we will be using Desktop GIS.
2.) It would be better to perform most of the data analysis and layer symbolization in data view because one can chose the “all-purpose view” for exploring, displaying and querying, but at the same time, one can focus on data in a single frame. However, the layout view serves simply for arranging map elements for printing and performing normal “data view” functions.
3.) There is first of all, the “What’s This” tool help that one can access by pressing Shift+F1 or to obtain further help, there is ArcGIS Desktop Help, which one can access by simply pushing the F1 button.
4.) Attributes are linked to geographic features in an attribute table via a unique identifier.
5.) When working in ArcMap, one uses a file called a “map document” or “mxd”.
6.) One way to zoom in/out on a map is by simply rolling the mouse wheel back and forth. The other way is to go to the toolbar and click on the zoom in or out tool and then click on a point you want to zoom in or out to.
7.) In the context menu of a layer, one can choose from a variety of different operations. One of them would be the “copy” option, where one can copy for instance a layer and then paste it somewhere else. Another example would be the “open attribute table” option, which consists of data associated with the geographic features or shapes. The last example, I want to point out is the “properties” selection, where one can change names and other features.
8.) If the check box next to a layer in the TOC is grayed-out, this means that the layer’s visibility depends on the map’s display scale. To resolve the issue, one would simply zoom in and then the layer will become visible.
9.) Small scale maps are actually characterizing large areas, like the entire world. The scale might be indicated as 1:400,000,000. In other words, large areas that are displayed in a map create small scale maps. Yet, large scale maps are representing a small area as for example the CSUN campus and could be illustrated by a scale of 1:100. Therefore, the larger the scale, the nearer features are to their original size.
10.) Features have shape and size and hence geographic objects have a huge selection of shapes. All of them can be represented as one of three geometrical forms, which are a polygon, a line or a point. A good example would be points that are generally used for cities and/or schools given that they are too small to be polygons, which would be countries or rivers. In contrast to for example countries, things as rainfall, elevation, slope, temperature and wind speed have no clear shape. Consequently, surfaces have measurable values for any specific location. The most well known surface is a raster, a matrix of identically sized square cells, where every cell stands for a unit of surface land and contains a measured or estimated value for that site.
11.) With GIS one cannot d) store project data.
12.) The minimum elevation value is 0 meters and can be found in New Orleans, USA. The maximum elevation value of the cities Earhart visited is 1045 meters and is located in Tucson, USA. I determined these values by clicking on the Identify tool on the Tools toolbar. When one clicks the tool, the Identify window opens. Then I went back to the map and clicked on the cities. The Identify windows show you the country and various other factors about a particular city as the elevation.
13.) The approximate distance from Dakar to Assab is 4,294.780241 miles, which I determined by clicking on the Measure tool on the Tools toolbar that opens the Measure window, which then gives you the opportunity to choose from the Units-drop-down arrow, point to Distance, to click on miles. Then I moved the mouse pointer over the city of Dakar, placed the crosshair and began to draw a line all the way to Assab. I ended the line by double clicking on it. The length of the line is now displayed in the Measure window. Another way of determining the approximate distance from Dakar to Assab, would be to open the attribute table of the Flight Path and then manually calculate the numbers that consists with the route that goes from Dakar to Assab.
14.) One way to figure out the names of cities shown on a map is to click on the Select Elements tool in the Tools toolbar and then move the cursor over the particular city you want to know the name of. The city’s name displays as a map tip. A different way would be to make the names of the cities visible at all times. One has to go to the Table of Contents, right click the layer that contains the cities and then click on label features. Now the name of each city appears next to the map feature.
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