Chapter 14 - GIS Fundamentals Final

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GIS Fundamentals
Chapter 14
Uncertainty
updated 4 months ago by Abby_Bohman
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1

Why are standards so important in spatial data?

it is an established or sanctioned measure, form or method. It is agreed upon. important because of the range of organizations using data. facilitate common understanding

2

Can you describe processes or activities that are greatly helped by the existence of standards?

data standards, interoperability standards, analysis standards, professional or certification standards- establish the education or knowledge or professional experience of the GIS analyst

3

What are the differences between accuracy and precision?

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4

How do mean and frequency thresholds differ in the way they report positional error?

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5

What are some of the primary causes of positional error in spatial data?

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6

Describe each of the following concepts with reference to documenting spatial data accuracy: positional accuracy, attribute accuracy, logistical consistency, and completeness.

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7

What is the NSSDA, and how does it help us measure positional accuracy?

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8

What are the basic steps in applying the NSSDA?

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9

What are the constraints on the distribution of sample points under the NSSDA, and why are these constraints specified?

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10

What are good candidate sources for test points in assessing the accuracy of a spatial data layer?

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11

How are errors in nominal attribute data often reported?

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12

What are metadata, and why are they important?

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