Chapter4-Chapter 4 talks about the importance of using. Density maps: how they’re used, what they should be used for, and how the GIS System is used to make these kinds of maps. With your data, you can decide what kind of way you want to map out density. It tells you exactly which density map to use. Is specifically why you should use them. The two ways you can map out density are defined area and density surface. Both use completely different ways of mapping density and have many benefits and some downsides. When mapping by a defined area, you are either using mapping dots or calculating the Density value for each area. Using dot density mapping, maps show density graphically rather than the density value. A density surface is usually created in the GIS as a raster layer. This approach provides the most detailed information but requires more effort. When using a density surface, you usually use colored layers to indicate how Many of one thing are in that area. When using it, use specific colors to better interpret the dot-density map. It is important that you don’t make your dots either too big or too small or place them in a way that makes the pattern unrecognizable. If you do this, it might be very hard for a person to understand your map and the main points you are trying to highlight. Make sure to always double-check your units because this may affect how your map is displayed and the information on it. If you are using. If you have a density layer map and use a different unit, it may calculate and display your information differently from how you want.
Chapter 5- When trying to figure out what’s inside your map, an important thing the chapter says is that you might want to circle the area that you are trying to understand. When trying to figure out what is in your area, there are many ways to do so, and the methods you use depend on the information and data you have. Ways that may determine your data include whether you are looking into multiple areas or one specific area. If you are looking to explore multiple areas, show how much of something is in each area. If you’re looking at multiple areas, you’ll want to be able to identify each area by name. If you, for example, were using fire stations across multiple areas, you might want to list each fire station as fire station alpha, fire station delta. It lets you compare the areas together. If you’re looking at a single area, you can monitor and summarize information about it. When looking at features inside an area, can we list them as discrete or continuous? Discrete features are unique to that area. Count them or put a numeric value on them. Continuous features represent seamless geographic phenomena. When reviewing your Analysis, you will need to determine whether to list, count, or summarize all your attributes. You can choose to include only features that fall completely inside, features that fall inside but extend beyond the boundary, or include only the portion of the features that falls inside the area boundary. When trying to find what’s inside an area, there are multiple ways to draw the area and its features, select the features within the area, and overlay the area and its features. Each of these has its own benefits and trade-offs. Drawing areas and features helps figure out whether things are inside or outside an area. The trade-off is that it is quick and easy, but it’s only visual. A summary of what’s directly inside the area. The trade-off is that it is good for getting information within a single specific area. Overlaying the areas and features. Identify the features within multiple areas and summarize them by area. The tradeoff is More time consuming and requires more processing from GIS
Chapter 6: When trying to figure out where something is in relation to something else in GIS, we will have to decide whether to measure it by distance or cost. Distance is one way to define and measure how close something is. The other would be by the coast, depending on how long it would take to get there. Once you find nearby items by distance or cost, you will need to determine how many items to list, count, or summarize that are near what you are measuring. When looking for this, a thing that might be Inclusive rings. Which rings would help you find what’s in the distance or within your budget? Another helpful kind of ring is a Distinct band. These bands are useful for comparing distance with other characteristics. Whenever you’re trying to figure out what’s inside, there are many different ways to determine the distance between each thing. There are three ways to determine whether they are straight-line distance, distance, or cost over a network, or cost over a surface. For using the straight line distance. Its prose is relatively quick and easy, and it measures distance. The cons of it. It only gives you a rough approximation of travel distance. When using distance or cost over a network, it measures the distance or cost. It gives a more precise travel distance. But the downside is that it requires an accurate network layer, which can be challenging. Cost over a surface measures cost. Its prose lets you continue combining several layers to measure the overall travel cost. It requires some data preparation to build a cost surface, which may cost you extra time. After determining which one you’ll use, you’ll have to create a buffer. Buffers draw lines around a feature at a specific distance.
