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GGH2603 ASSIGNMENT 2.latest update 2020
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- University Of South Africa (Unisa)
GGH2603 ASSIGNMENT 2
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ZULUM -TUTORIALGGH2603
ASSIGNMENT 2
QUESTION 1
1.1. How would the following coordinates be displayed in a GIS?
Coordinates (DMS) Coordinates (DDD.ddd) Displayed in a GIS
26˚09’07.9” S 26.152182 S 40 Snell Dr, Florida Park,
27˚54’37.7” E 27.910459 E Roodepoort, 1709
33˚57’04.7” S 33.951318 S Table Mountain nature
18˚26’23.8” E 18.439947 E reserve
22˚58’06.6” S 22.968497 S Copacabana, Rio de Janeiro -
43˚11’47.5” W 43.196528 W State of Rio de Janeiro,
Brazil
19˚48’32.2” N 19.808950 N Hilo, HI, USA
155˚27’54.4” W 155.465115 W
35˚21’45.8” N 35.362713 N Subashiri, Oyama, Sunto
138˚43’52.2” E 138.731154 E District, Shizuoka 410-1431,
Japan
81˚11’57.6” W 81.199343 W Big Cypress, FL, USA
26˚00’02.2” N 26.000613 N
1.2. Use Google Maps and identify the feature at these coordinates.
Coordinates Feature
-29.612432, 31.112072 Row of trees
-24.730695, 15.366931 River
-19.355605, 23.031459 Game reserve
-16.522634, 28.762189 Dam wall
, QUESTION 2
Maps come in a variety of scales. There in general three classes of scale, namely small,
medium and large scale and can be distinguished by the use of fractional or ratio
expressions.
Small scale
These are maps that covers larger areas like world map of map of the galaxy. They contain
limited information and features in these maps appears small. Small scale maps are
overgeneralised. Their numeric value is large (e.g. ranges from 1:2 000 000 – 1: infinity).
Maps with regional, national, and international extents are the typically with small scale.
Due to low resolution of these maps, geographic information shown is less.
Medium scale
medium scale numeric value ranges between 1:600 000 – 1:2 000 000. This scale is used for
maps such as of a country. As in the small scale, they contain limited information as
compared to the large scale. Features appear smaller thus it has a poor resolution.
Large scale
They cover small areas such as cities and towns. This scale is specialised, more detailed and
the features in the maps appear bigger. The numeric value of the scale is smaller (e.g. 1:10
000). This scale is typically used in showing maps of site plans, local areas, neighbourhoods.
Map resolution is higher and therefore level of detail is higher.
QUESTION 3
3.1. The perimeter of the Helderberg Nature Reserve.
Perimeter = sum of all sides
P = 1.5 + 3.7 + 0.4 + 0.7 + 2.5 + 5.8
= 14.6 cm
= 7 900 meters.
3.2. The N2 road distance between points D and
E. MD = 10.5 cm
= 5690 m
5690
=
1000
= 5.69 km
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