DaTa EnTrY

I. Read Bolstad Chapter 4 and answer the following questions based on the reading and lecture.

1.       Would you have more problems with feature generalization and omission in large or small scale maps? Why?

·         Large scale maps cover smaller areas which usually results in less map generalization and omission. There would be more problems with feature generalization on a small scale map because there are more fused or aggregated features. Therefore more generalization and omission occurs. The few is not as clear on a small scale map.

2.       What is snapping in the context of digitizing? Why is snapping important (i.e. what does it help avoid)?

·         Snapping is the process of automatically setting nearby points to have the same coordinates. It relies on snap tolerance or snap distance. They are used to reduce undershoots and overshoots while digitizing.

3.       What is COGO and how does it relate to coordinate surveying?

·         COGO is a coordinate geometry that it is used to calculate the station coordinates. In other words, it defines a connected set of points from the starting station to a subsequent station. IT allows the calculation of coordinate locations form open or closed transverse(a series of connected lines that have a marked beginning and ending point. This is the way most coordinate surveys are done) Distance and angle measurements are combined with trigonometric formulas to calculate coordinates. The direct entry of COGO data leads to more accurate digital database than the digitization of cartometric maps. Many errors are avoided.

EXERCISE A

Q: What is the feature class type (point, line or poly) for springs? __point________

Geocoding

Ex16C