GIS Data Collection Quiz

Distinguish between primary and secondary data and give examples of each.

Why is data maintenance often a far more difficult and expensive activity than the initial data collection?

What do you understand by the terms ̳active‘ and ̳passive‘ satellite sensor systems and what are the relative advantages of each?

Why is it often necessary to scan paper documents for data entry into a GIS?

Describe the necessary steps in a workflow for manual digitizing using a semi-automatic digitizer. How and why does this process introduce ̳error‘ into the database?

You are required to merge together in your GIS database digital cartographic data with some satellite imagery. What are the necessary steps in this process and the likely sources of difficulty?

How does national and international legislation on freedom of information and copyright affect the market for geospatial data?

What are the difficulties in translating between different data formats, and what software solutions have been suggested?

It is often suggested that in satellite imagery there is a trade off between spatial, spectral and temporal resolution. Outline and illustrate what is meant by these properties. To what extent do the data in Table 9.2 support this idea?

Describe the various ways by which ̳error‘, defined as the difference between reality and our representation of it, can be introduced in the process of data collection and integration into a GIS.