Geog 458:Map Sources and Errors

January 27, 2006

Midterm Review

Sample questions

Contextualizing spatial data

• Discuss the value of metadata

• What is the vision of NSDI?

• How do inter-agency initiatives – national map, geospatial one stop, and FGDC – fit together?

• What are core components of NSDI?

Representing Geography

• What are building blocks of geographic representation?

• What is topology? How is it stored in a table?

• How does generalization algorithms work?

• What is hybrid GIS?

• What is TIN? How does it work?

Data collection

• How is spatial data collected?

• What are three key aspects of resolutions of remotely sensed image?

• What is the advantage of using active remote sensing system?

• Compare and contrast aerial photo and satellite image

• What is SDTS?

Georeferencing

• What are basic assumptions of address geocoding?

• What is linear referencing?• What is ellipsoid?• How is NAD27 different from NAD83?• {T,F} UTM has equatorial aspect• {T,F} SPC adopts one projection• Which geometric property is preserved in UTM

Data storage and editing

• How can be examining dangling nodes helpful in detecting potential errors?

• When do you use rubber-sheeting?

• What are five components of data quality?

• Give me examples of attribute accuracy

• Give me examples of logical consistency