5) List and describe five different types of digital geographic data that are av

Question

5) List and describe five different types of digital geographic data that are available from U.S. government sources (spatial and attribute). (10 pts) a. b. C. d. 6) What are the relative merits of manual digitizing vs. scanning? (10pts) 7) Describe the major technological/methodological problems facing GIS development. Are the major problems in data input, data management, manipulation or data output? (10 pt) 8) Describe how slope and aspect are calculated from a digital elevation model then calculate the slope and aspect in the example below. (10 pt) sze: 10meteas, dagonal cals 1414aprt 5415916d 156 161 16 Sope of midde cel Aspect of midde cell 158 164 169 (Expressed as E,NE,NNW et, remamber to determine which drecton the slope is tacng based on the middle cel) 9) Describe the important developments in hardware and software during the past 30 years by decade that made GIS both possible and accessible to a larger user base? (10 pt; continue on back)

Explanation / Answer

5) Five Differnet types of digital geographic data that are available from US government source.

a) US hourly Precipitation Data - Hourly Precipitation Data (HPD) is digital data set DSI-3240, archived at the National Climatic Data Center (NCDC).

b) 1m digital elevation models(DEM) - This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution.

c) National Flood Hazard Layer (NFHL) - The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map.

d) USGS small - scale dataset - This map layer includes cities and towns in the United States, Puerto Rico, and the U.S. Virgin Islands.

e) NCDC storm events database - Storm Data is provided by the National Weather Service (NWS) and contain statistics on personal injuries and damage estimates.

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