6.01 THE DISTRIBUTION OF PEOPLE - GRID

Data ID

Description:

Population density of people in Namibia in 2000, mapped at 1km resolution

Chapter:

6 People, Services and Infrastructure

File name:

population

File type:

ArcView grid

Geographical area:

Namibia

Keywords:

population

density

2000

Notes on data, analysis and

Population data from a number of sources were mapped and gridded as described below. Map units of the grid = km.

compilation:

DATA SOURCES:

For Caprivi, north-central, Kavango, households:

1) Mendelsohn, J.M. and Roberts, C.S. 1997. An environmental atlas and profile of Caprivi. Ministry of Environment

and Tourism, Windhoek

2) Mendelsohn, J.M., el Obeid, S. and Roberts, C.S. 2000. A profile of north-central Namibia. Gamsberg MacMillan,

Windhoek

3) Mendelsohn, J.M. and el Obeid, S. 2001. A preliminary profile of Kavango region. Namibia Nature Foundation,

Windhoek.

For other urban and rural populations north of 21º:

4) Household data from the 1:250,000 mapping project were used.

For urban populations south of 21º:

5) Population estimates were taken from the "Analysis of Present and Future Water demand in Namibia" prepared for

Namibia Water Resources Management Review by Windhoek Consulting Engineers.

For communal areas south of 21º:

6) Households were marked from 1:80,000 aerial photos and some data from the Directorate of Rural Water Supply’s

databases were used.

For populations south of 21º in commercial farming areas:

7) The numbers of people per enumeration area in the 1991 Population and Housing Census were spread across

commercial farms in that enumeration area. The 1991 Population and Housing Census data were used to derive the

average number of people per household in each area.

DATA COMPILATION:

For urban areas south of 21 degrees:

1. 1999 Population estimates were taken from the 'Analysis of Present and Future Water demand in Namibia' prepared

for NWRMR by WCE (Table 4.2).

2. For the following places the 1991 census enumeration areas were used to define the urban area:

Aroab, Gochas, Koes, Rehoboth, Stampriet, Bethanie, Gibeon, Kalkrand, Keetmanshoop, Maltahohe, Mariental, Schlip,

Tses, Aus, Luderitz, Aranos, Gobabis, Leonardville, Witvlei, Hentis Bay, Kalkfeld, Omaruru, Grunau, Karasburg,

Oranjemund, Arandis, Karibib, Okahandja, Otjimbingwe Town, Swakopmund, Usakos, Uis

3. For Ariamsvlei and Warmbad the gazetted townlands were used to define the urban area.

4. For Walvis Bay and Windhoek, the enumeration areas used were those used in 1995 Windhoek household census

survey and the 1997 Walvis Bay residents survey.

5. Generally, townlands boundaries were used to demarcate urban areas. However in some cases, amendments were

subsequently made and enumeration areas were used to define urban areas: Mariental, Henties Bay, Usakos, Luderitz,

Karibib, Katima, Gobabis. For other places, scanned 1:250,000 maps were used: Otjimbingwe, Warmbad, Ariamsvlei,

Aroab, Witvlei, Stampriet, Aus, Koes, Schlip, Kalkfeld, Leonardville, Gochas, Kalkrand, Omaruru.

6. Population density per km was recalculated and then gridded at 1 km.

For urban areas north of 21 degrees:

1. Data from the 1:250,000 mapping project, on the number of households per urban area, were used. 1991 census data

were used to derive the average number of people per household in each urban area – where an urban area spanned

several enumeration areas, the total number of households and people in those enumeration areas were calculated and an

average ratio was calculated. This ratio was used to convert the number of households from the 1:250,000 data set into

the number of people.

2. Population density per km was then gridded at 1 km.

For Communal areas south of 21 degrees:

1. Data were extracted from 1:80,000 photos for communal areas. These were edited to include borehole data obtained

from Ministry of Agriculture, Water and Rural Development regional offices, where these filled in obvious gaps, to

make use of both datasets.

2. Emcon data were also used to supplement the Aminuis area, but numbers of households were halved since, in

	comparison with overlapping borehole data, they appeared to be unrealistically high.
3. Duplicate points were removed e.g. if they were already included in urban areas.

4. For each enumeration area, data from the 1991 census were used to calculate the number of people per household and

the household counts were converted to estimates of number of people using these ratios.

5. Areas included in urban grids were masked out and then values were spread over 2km.

For Caprivi villages:

1. Household data from the Caprivi profile were used (hhcounts.shp) for Caprivi region.

2. The values in the 'adjsouls' field (number of people) were gridded at 1 km, and spread over 2 km.

For North-Central households:

1. Data on households from the north-central profile were converted to lat-longs (households_alb.shp).

2. A mask was made to include the 4 north-central regions only, and to exclude urban areas and the south-east corner of

Oshikoto that was included in the aerial data from the 1:250,000 project.

3. Density values were spread over 1 km.

For Kavango households:

1. Data on households from the Kavango profile were used (kavango hh.shp).

2. A mask was made to include Kavango region only.

3. The values in the 'no of people field' were gridded at 1km, and spread over 1 km.

For rural areas north of 21 degrees:

1. Data from the 1:250,000 mapping project were used. A mask was made to exclude urban areas, Kavango and the 4

north-central regions (except the south-eastern corner of Oshikoto).

2. Density values were spread over 1km.

For rural areas south of 21 degrees: commercial farm areas:

1. 1991 census data were used.

2. A mask was made to exclude urban areas covered in previous analyses, and parks.

3. The total population numbers in those polygons split by 21 degree line were adjusted in proportion with the area of

the polygon included.

4. All farms in this area were added as points (using the co-ordinates of the farm centres).

5. The number of people per enumeration area was calculated, as was the number of farms per enumeration area and the

average number of people per farm was then calculated for each enumeration area.

6. The average number of people per farm was then spread over 2 km.

Compilation of all analyses:

1. The grids were combined into one.

2. The following places were added in, after comparing the density map to schools maps, and obtaining supplementary

information on Topnaar communities, SRT camp etc:

Place, Number of people, X co-ordinate, Y co-ordinate

Gobabeb, 14, 15.04267, -23.56131

Oswater, 30, 15.16292, -23.62865

Homeb, 30, 15.18968, -23.63604

Natab, 30, 15.07989, -23.60056

Soutrivier, 22, 15.02172, -23.52566

Klipneus, 18, 14.89910, -23.39310

Swartbank, 37, 14.86016, -23.33686

Ituseb, 16, 14.76211, -23.27726

Ururas, 34, 14.72894, -23.22582

Okombahe, 17, 15.32720, -21.38250

Okombahe, 17, 15.29110, -21.36740

Okombahe, 17, 15.16730, -21.34800

Okombahe, 25, 15.27860, -21.32510

Okombahe, 44, 15.33807, -21.33450

Okombahe, 74, 15.19320, -21.32730

Okombahe, 109, 15.29720, -21.32500

Okombahe, 109, 15.23650, -21.29210

Okombahe, 2049, 15.38860, -21.35170

Osire refugee camp, 15000, 17.37088, -21.07280

SRT camp, 17, 14.14193, -20.95609

Ugab river mouth, 25, 13.67279, -21.17564

Springbokwasser, 20, 13.64758, -20.31096

School, 1065, 17.85520, -21.23428

School, 519, 15.44028, -21.35139

School, 1062, 15.37917, -21.35750

School, 840, 15.37500, -21.36417

School, 357, 15.20639, -21.84583

School, 576, 17.51220, -22.95017

School, 666, 14.76417, -23.27444

School, 255, 17.05112, -23.52490

School, 93, 18.64128, -26.13650

School, 390, 16.75775, -27.95510

School, 240, 17.41552, -28.35863

School, 5889, 17.25026, -20.96381

Dawedraais, 30, 14.67738, -23.18684

Amstraat, 43, 14.67073, -23.1813

	Data quality and organisation
Positional Accuracy:		Ranges from GPS co-ordinates to points extracted from (or adjusted according to) 1:250,000 maps

Vector/Raster:

Raster

Spatial reference

Projection:

Albers Conical Equal Area

Spheroid

Bessel

Standard parallel1

-27

Standard parallel2

-19

Longitude of central meridian

18.5

Latitude of projection origin

-27

Fields

Field name

Field description

Value

Population density per km2

Source/Distribution

Data Source:

See notes on data analysis and compilation

Distribution notes:

Unrestricted