1. Points, lines, and polygons a) can be considered the \"attributes\" of a GIS
ID: 292739 • Letter: 1
Question
1. Points, lines, and polygons
a) can be considered the "attributes" of a GIS data set
b) are called vector primitives
c) can only be used to map discrete objects
d) can be stored in the same feature class in ArcGIS
e) both b) and c)
2.Define the terms metadata and data dictionary. Provide an example of the type of information stored in metadata, and explain what metadata are used for and how it can add value to a data set.
3. You have been given a shapefile of London census tracts with an attribute table containing the average property value for each. Explain how you would use ArcGIS to reclassify these data into three quantile classes labeled high, medium, and low that are stored in the data set
4. Define the standard line, and explain how scale factor relates to it, and then explain why scale factor can be greater than one or less than one, using a diagram to explain your answer.
Explanation / Answer
1.Point, lines and polygons are the vector primitives, which can be used to map discrete objects. Both B and C are correct. Points are used in capturing settlements,well etc. Lines are used in capturing roads. polygons for river etc.
2.Metadata are the one having information about the data. Metadata stores data format, captured date and by whom it captured etc. are all available in metadata. it is used mostly for periodical studies about some task. If we need a data on this particular date we can get easily with the help of metadata, change analysis are done with the help of periodical data,Data dictionary stores all information.it is the basic definition of database.data dictionary also a metadata which stores information about the database.
3. Add the shapefiles in Arcgis, then go to properties,click symbology, in the left side quantities option available just click it then go to the value field, select the property value column, and select classify option next to value field.in that select method as quantile and classes as 3, then apply ok, now the london census tracts shapefile classified into 3 classes based on quantile method.
4. Standard line is a line or sphere that has no length compression or expansion after being projected, usually a standard parallel or central meridian. Scale factors are depends on the projection, we are using, WGS1984 projection having scale factor of 0.996. In a coordinate system, a value that converts a tangent to secant projection. if a projected coordinate system doesn't support a scale factor, then the standard lines of projection having scale factor of 1.
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