CEE 6440 Midterm: midterm2002
31 Jan 2019
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They are of equal credit: (a) in gis, geographic data has a number of ways of being represented. Give a brief description (including a sketch) of the following geographic data types. Triangulated irregular network (b) you should be aware of the national gis datasets listed below. Indicate the data type for each of these from (a) vector, (b) raster, (c) triangulated irregular network. National hydrography dataset (c) explain what the hydroid is and why this is important in the arc hydro data model. 1: (a) consider the one degree box surrounded by parallels 42on and 43on and meridians. Your sketch does not have to be exact, but should be sufficiently precise to show the difference in shape between (1) and (2). 2 (b) explain the difference between the terms geodatabase and feature dataset. (c) explain the difference between feature selection using a tabular query and feature selection using a spatial query.
