Introduction

Question 1

study

data factory

Information system

Answer 1

Study of complementary networks of hardware and software that people and or organisations use to collect, filter, process, create and distribute data.

Question 2

study

computer system

MIS(management information systems)

Answer 2

Study of how systems work
computer system consisting of hardware and software that serves as the backbone of organizations

Question 3

xtichs

Attribute data

Answer 3

Data that describes the characteristics of spatial features and can be quantitative/qualitative.

also known as Non-spatial data

Question 4

list the components that make up a functional GIS

Answer 4

1. hardware
2. software
3. data
4. people
5. methods

Question 5

cholera in london

history of GIS

Answer 5

1. (1854-1960) dark ages
2. (1960-1975) pioneering
3. (1975-1990) software commercialization
4. (1990-2010) user proliteration
5. (2010…) open source era

cholera outbreak in london (John Snow)

Roger Taminson the father of GIS

Question 6

the two main categories used in classifying GIS data

Answer 6

1. spatial data
2. non-spatial data

non-spatial data is also known as arttribute data

Question 7

illustrate and explain the three poossble mistakes that result to dangling nodes

dangling nodes is one of the errors in vector data editting

Answer 7

• unclosed polygon-failure to close polygon
• undershoot-failure to connect node to the object it was supposed to be connected to
• overshoot-a node going beyond the entity where it was supposed to be cinnected

Question 8

errors in vector data editting

Answer 8

1. pseudo nodes
2. dangling nodes
3. label errors
4. sliver polygons

Question 9

ways of detecting and correcting errors in attribute data

Answer 9

• checking for impossible values
• checking for extreme values
• checking internal consistency
• through scaatter diagrams
• through trend surfaces