Chapter One Flashcards
How is Raster Data set used in this text?
It is a set of grid cells which represent a map pictorially and it is based on a structure software in the book.
What is a vector data structure and how is it represented in this text?
Basically it is a set of polygons, lines and points and it is based on the software structure
What are data collection methods and how are they used?
There are two kinds of data collection there is primary which is first hand like soil samples and than there is secondary which is uses remotes sensors and so forth.
How do you get data into GIS?
- Define how and where to best gather, acquire or sample the data.
- Collect or sample, data directly or indirectly using sensors.
- Transform data into something the computer can recongize.
What are different types and kinds of data selection software types?
Soil probes, GPS units, analog and digital camera, voice recorder, sateillite, remote sensing devices etc.
What is a basic understanding of spatial data?
There are close things which are related and far things which are not.
Here are a list of things which can help you think spatially
Density: For example if you are working with an urban planner you will notice that there are more rider in denser areas.
Sinosity: Ever no connectivity, pattern change, movement, shape, and size. This is what urban planner plan to make you slow down.
Connectivity: This allows people to move from one place to another which is connectivity.
Pattern change: This is when area of land become very fragmented in resdenital areas. What impact does this have on deer.
Movement: Weatherman, track the pattern of hurrians and when they are so they can predict the storm travels.
Shape: Developes in nature of the land.
Size: Needs large cruch
What are three more ways to recognize a pattern?
Size: Needs large chucks of land because youare using large equipement that doesn’t work work in small parcels.
Isolation: You are a business owner and you notice that the number of people who visit your storys are dropping
Adjecency: The value of your homes goes down because your zoning board just rezoned.
How is data viewed in the GIS terms ?
It is viewed in terms of dimenionality and descriptions.
What is a summary of dimensionaliries?
Points: On a map they have zero dimensions they do not take up space.
Line: There are used to depect railways and do not have lenght and there are no points.
Pologyons: Most common kown area it give you the area of something.
Surface: Have three dimensions which is the lenght the width and a third dimension by the character of the surface.
What are descriptions?
Nominal: This is wen you give features to have name only. There is not something you can describe or compare these features.
Ordinal: Geographic features have detailed increments that yo can just be measured. This is something which give you accurate information.
Ration: This is something which can have measureable units like interval data but all you make rational comparisons.
Scalar: This is data which has its is harder to define because this is something which you can make up.
What is a map scale?
This is how much map you are looking at and how big or small you plan on making something.
What can we guess about a scale?
A scale will determine how much or how little your map will hold
What do map makers have to consider when making a map?
Scale: They have to determine how much can be fitted on a map.
Data activity: This will determne how much and what type of information can be placed on a map.
Limitation of output devices: The cartograher have to make symbols befire they are printed.
Reader characteristics: Not all reader will have 20/20 visions and so forth.
How do you read a reference map?
They cover a huge amount of detail and can be useful for the theme being presented.
