national geo-spatial information

SASDI

National Geo-spatial Information

Aslam Parker

Applicable Legislation:

• NGI in existence since 1920 • Land Survey Act, 1997 (Act 8 of 1997)

– Sec 3A – duties of Chief Director• SA Geographic Names Council

– CD: NGI is a permanent member• Spatial Data Infrastructure Act, 2003 (Act 54 of

2003)– Besides cadastral data, NGI is by far the largest

collector and custodian of spatial information in SA

1. National Geodetic and Control Survey Services

2. National Aerial Photography and Imagery

3. National Maps and Geo-Spatial Information

4. Implement South African Spatial Data

Infrastructure

5. Professional and Advisory Services

NGI: Key Products and Services

2. National Imagery Acquisition Programme

• Since 2008, all imagery acquired will be multispectral (Pan, R,G,B and NIR)

3. National Mapping & Geo-spatial Information Programme (Land Cover)

• Drivers behind the need for land-cover– Significant number of legislative (and some voluntary)

requirements that need land-cover as either direct or indirect inputs to support reporting requirements on a regular basis.

• eg NEMBA), NEMA, National Water Act Desertification, National Forest Act, etc…

– Also operational departmental requirements from National, Provincial through to Local Municipality levels which require land-cover / land-use data in support of management, monitoring, review and planning purposes.

• IDP’s, SDF’s, EIA’s

• Last National Programme NLC 1996, NLC2000 • Some provincial land cover datasets done as

projects• For Land Cover:

– LCCS based classification with lower levels been defined, however, not widely adopted

– Standards not clear and still needs to be defined.• To date, 12 pilot sites and North West province

3. National Mapping & Geo-spatial Information Programme (Land Cover)

South African Land Cover Legend

Cultivated and Managed Terrestrial Primary Vegetated

Areas 3.

Natural and Semi-Natural Terrestrial

Primary Vegetated Area

1.

Natural or Semi-Natural Aquatic or

Regularly Flooded

Vegetated Area2.

Cultivated Aquatic or

Regularly Flooded Vegetated Area

4.

Woody 2.1.

Herbacious2.2.

Shrubs1.2.

Forbs and Herbland

1.3.

Trees1.1.

Graminoids1.4.

Broadleaved Evergreen

Trees3.2.

Broadleaved Deciduous

Trees3.3.

Needle Leaved Trees

3.1.

Broadleaved Shrubs

3.4.

Herbaceous Graminoids

3.5.

Herbacious Non

Graminoids3.6.

Urban Vegetated

Areas3.7.

Artificial, Terrestrial Primarily Non-

Vegetated Area6.

Natural, Terrestrial Non-Vegetated

Bare Area5.

Natural Non-Vegetated Aquatic or

Regularly Flooded Water Bodies

7.

Artificial Non- Vegetated Aquatic

or Regularly Flooded Water

Bodies 8.

Build up Linear Feature

6.1.

Build up Industrial and Other Areas

6.2.

Build up Urban / Residential

Areas 6.3.

Build up Object6.4.

Non Build up, Artificial Bare

Area6.5.

Consolidated Hardpans

5.5.

Consolidated Cuttings

5.4.

Consolidated Bare Rock and

Coarse Fragments

5.3.

Unconsolidated Bare Soil

5.2

Loose and Shifting Sands

5.1.

Non-Perennial Pans7.1.

Perennial Freshwater

Lakes7.2.

Ocean7.3.

Natural Salt Pans7.4.

Non-Perennial Rivers 7.5.

Perennial Rivers

7.6.

Standing Artificial

Water Bodies8.1.

Canals8.2.

Pilot Land Cover Data

• Methodology: collaborating with CSIR , researching multitemporal, multisensor solution for Land Cover

• MODIS-like processing (building on 10+ years MODIS experience)

• WELD installed at CSIR, South Africa – data back bone

Collaboration with CSIR

– Area 92100 km2 – Official Land cover map of KZN 2008 - SPOT5 (GeoTerra Image)– Training and validation data were generated from land cover

map – centroids (single 30m pixel) of land cover polygons larger than

2 ha (N= 242 620 sites).

CSIR Landsat Study Area

Land cover map from 7 Landsat bands of 4 seasons – 78% accurate

• No global classification system for land sue• Methodology (work in progress)• Actual Land Use vs Zoned/ Planned Land Use• NGI initial proposal: 14 Main classes and 60 sub-classes.

– 1. Agriculture & Fisheries, 2 Forestry, 3. Conservation, 4, Mining, 5. Transport, 6. Utilities & Infrastructure, 7. Residential, 8. Community Services, 9. Business & Retail, 10. Industrial & Commercial, 11. Recreation & Leisure, 12. Defense, 13. Unused Land, 14. Water

• What about leisure/holiday resorts, recreation trails, beach, recreational swimming/tidal pools etc

3. National Mapping & Geo-spatial Information Programme (Land Use)

• General– There is not enough skill and capacity in industry – – Need automated classification methods

Land Cover and Land Use- need for automation

Completely Manual

Semi-automated Pixel based classification

Fully Automated Object oriented classification

Cost

Tim

e

SASDIThank You

aparker@ruraldevelopment.gov.zawww.ngi.gov.zav