Copyright 2010, The World Bank Group. All Rights Reserved. Managing Mapping Operations Section B 1.

Copyright 2010, The World Bank Group. All Rights Reserved.

Managing Mapping Operations

Section B

1


Mapping for Statistical Projects

• Base maps should be updated regularly as they become less accurate over time

• Full mapping update work requires 2-3 years time, depending on country conditions

• Mapping unit should be part of data processing

• Mapping data provides estimates for sampling, staffing, and procurement

2


Mapping Problem Areas

• Physical environment problems

• Nomadic areas

• Rapidly growing areas

• Undefined or disputed boundaries

3


Possible Solutions

• Use smaller scale maps and show all roads and tracks

• Aerial photography

• Map nomadic routes

• Sketch map rapid growth areas

• Use statistical entities

4


Mapping Technology

• Drafting - drawing maps using drafting tools such as easels, templates, and compasses, make scale drawings of roads, airfields, buildings, and other features incorporated into maps.

• GIS – a system of hardware and software used for storage, retrieval, mapping, and analysis of geographic data.

5


Commonalities

• GIS and Drafting both require field work for data collection

• Require technical staff for drafting or digitizing

• Adequate work space for specialized equipment

• Access to map archives (digital and print)

6


Benefits of GIS

• Better planning of government services

• Analysis of poverty

• Emergency planning

• Food security

7


GIS Costs

Considerations for adoption of GIS:

– Skilled staff

– Purchase appropriate equipment and software

– Ensure proper infrastructure

– Maintenance contracts

– Successful pilot project

8


Mapping Quality Control

Mapping outputs are largely human rather than machine products, thus subject to error

• Evaluation of maps

• Verification of mapping operation outputs

9


Evaluation of Maps

During inventory and acquisition of maps, check:

a. Coverage

b. Scale

c. Size

d. Detail

e. Date

f. Reproducibility

g. Usefulness and accuracy

10


Quality of Mapping Operations

• Select people with particular skills, education or experience for mapping operation

• Establish continual training program

• Monitor staff productivity and error rates

• Review work to catch errors

11


Verification of Mapping Outputs

Verification of the products of each step of the mapping operation is a review of:

a. Map compilation

b. Drafting

c. Reproduction

d. Delineation

e. Identification

f. Publication

12


Operational Control

The control of materials to and from the field throughout operations. Operational control system must:

1. Determine location of materials at all times

2. Show progress of work

3. Make decisions on materials

4. Identify and predict problems

13


Operational Control Considerations

• Materials to be controlled– Type– Quantity– Correspondence– Equipment supplies

• Unit of control– Dependent upon operation

– Number of units

14


Quality Control of Publication Maps

Professional staff should verify:

1. Will it be possible to make copies of the map?

2. Is the size correct (publication, wall chart, etc.)?

3. Are the headings and legends properly placed?

4. Has proper reference been made to source materials?

15


Quality Control of Publication Maps

Professional staff should verify:

5. Has correct identification been used (agency name, division, publication, etc.)

6. Is the drawing adequate to clearly show all the necessary information?

7. Are lines, symbols, terms, and abbreviations consistent with standards?

8. Does the map or graph accurately represent the statistical data on which it is based.

16


Always Include on All Maps1. Projection - attempts to portray the surface of the earth

on a flat surface. Different types of projections minimize different kinds of distortions resulting from mapping on a flat surface.

2. Scale - Map scales indicate a consistent relationship between size on the map and actual size of the area represented.

Maps usually not only show the scale ratio but convert the ratio to units of measurement.

For example, a 1:24,000 map, where one map unit equals 24,000 inches, can also be expressed as1 inch = 2000 feet

17


Always include on all your maps

2. Data Source

3. Date of Data

4. Date of Drafting or Digitizing

5. Name of your organization

18


Educational Outreach

• Include mapping unit in data user meetings

• Use presentations to show GIS or thematic map capabilities

• Develop education partnerships

• Include mapping in presentations and dissemination

19


Section B Quiz1. Name two problem areas that may cause risk factors

for mapping?

2. What does GIS stand for?

3. GIS mapping is faster because there’s no field work? True or False

4. What are the two methods of mapping quality control?

5. What is operational control?

6. Name three things that should be on every map.

20

Copyright 2010, The World Bank Group. All Rights Reserved. Managing Mapping Operations Section B 1.

Documents