gis as1 - for merge (1)

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University of Memphis *

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7613

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Geography

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Dec 6, 2023

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docx

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Uploaded by MajorGull3241

STUDENT NAME: VENKATA NIKITH PULGAM STUDENT ID:U00885957 1)Explain the difference between discrete and continuous data sets in your own words. Give three examples of each Discrete data Discrete data sets provide information on things that can be seen objectively and in fact, such as cities, lakes, or counties. It is displayed in triangles, dotted lines, and polygons serving as representations of the data. Example: The altitude at which the mountain top is located A city located on a map A meteorological station is a facility which is used for measuring atmospheric conditions A road Continuous data Continuous data are collections of data regarding something ethereal or unseen quantities that can be measured on Earth. Continuous data varies with time; it is not a fixed date. This data is stored using raster modelling. The raster model divides continuous data (i.e., a specific geographic area) into small squares called cells or pixels. Example: Pressure measurement, altitude measurement Temperature measurement Longitude and latitude. Relative humidity 2)A 50-m long swimming pool measures 2-cm on a large-scale map. What is the scale of the map? 1 x = 2 5000 Solving for x we get 2500. So the scale of the map is 1:2500, meaning that one unit on the map corresponds to 2500 units of land.

3)Explain why GIS data sets are considered to have a source scale but not a map scale. GIS data sets have the source scale because only the coordinates are stored , and the original dimensions are obtained only when these coordinates are drawn on paper,which refers to the original resolution or level of detail at which the data was collected. GIS datasets do not have map dimensions, because the map scale is expressed as the ratio of the size of the features on the map and their real size. A dataset inherits a source scale from the original paper map at which it is based. GIS data can be displayed at different map scales without altering the underlying source data. 4)In what ways have the sources from which GIS data are obtained changed? GIS data was first obtained from information sources such as disks on which GIS software was updated. Initially, data was obtained from sources like government agencies, surveys, and paper maps. Data clearing houses were used to download data onto CDs and DVDs. With the growing presence of the internet, GIS data sources have also changed. An increasing number of organizations have started publishing data on the internet, from where these sources of information are available to different people. Unlike primary sources, these services allow users free access to information whenever they need it. Nowadays, GIS data is also not often stored in the cloud as opposed to giant datasets 5}Jamie is hiking trails in a forest and using his smartphone to track his position. In this remote location with heavy tree cover, his phone typically records his position within 25 to 50 meters. Discuss the accuracy and precision of the trail map he creates. Precision Jaime's trail would be considered precise because the trail map is approximately the same and follows the same pattern as Jaime's. Precision refers to the consistency and repeatability of measurements Accuracy The trail would not be accurate as it could be anywhere from 25 to 50 meters away from Jaime's actual location, meaning the map he created is likely not in the exact same location as he was as they should be close the measurements to there true values.

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