geoinformation and risk mapping in cameroon soils...
TRANSCRIPT
INC NICNATIONAL INSTITUTE OF CARTOGRAPHY
GEOINFORMATION AND RISK GEOINFORMATION AND RISK MAPPING IN CAMEROONMAPPING IN CAMEROON: :
SOILS LOSS MAP OF SOILS LOSS MAP OF YAOUNDEYAOUNDE
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
Cameroon Location Cameroon Location INC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
Football country, Samuel Eto'oINC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
STATEMENT OF PROBLEM SUSTAINABLE DEVELOPMENT
AND PRESERVATION OF THE ENVIRONMENT PROGRAM◦ OBJECTIVES◦ METHODOLOGY
CASE STUDY OF YAOUNDE ◦ SOILS LOSS AND ISSUES MAP
CONCLUSION
OUTLINESOUTLINES INC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
• - The prevention, management and monitoring of major risks and disasters are concepts poorly assimilated by the Cameroonian people
• - The occurrence of several catastrophic events in recent years especially in major urban centers have revived the issue of the day.
• - This allowed the reaction of the different actors in risk management, in particular the State which has committed a certain number of shares:
• a. Implementation Plan Emergency Relief (Civil Protection)• b. Preventive campaign eviction of people occupying the
unbuildable areas of large cities (Douala and Yaoundé)• c. Improving the regulatory framework by signing decrees texts
that struggled to come into force.
STATEMENT OF PROBLEM
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NIC
•The most recurrent risks in Cameroonian cities are: erosion, floods, landslides, collapse of building, fire...
•National Risk Observatory (ONR) in 2003, and the National Mapping Agency, contribution in the field of environmental risks and ecological studies by data production (study of the deformation of Mount Cameroon, changing the fault line, water-Erosion risk ...)
•Despite the presence of the observatory that includes within it several administrations, lacks a coordinated approach to collecting and maintaining geospatial data and information
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NIC
SUSTAINABLE DEVELOPMENT AND PRESERVATION OF THE ENVIRONMENT PROGRAM: Study and risk mapping and naturaldisasters in cameroon
Geographic Research DivisionNational Institute of Cartography
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
-Contribute to the control and management of natural hazards and disasters in Cameroon by the provision of information that improves decision making in prevention, mitigation or adaptation to natural disasters, to effect of setting up a national plan for risk prevention.-
It is specifically to: • Implement risk infrastructure in Cameroon;• Produce risk area maps(general and specific) ; Have a spatial database on natural hazards in Cameroon
OBJECTIVES INC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
Based on the type of risk to study
INC NICMETHODOLOGY
The implementatio
n of risk infrastructure
-Natural factors- Sensidivity of environment
Physical environment
studu
Human vulnerability
Preparation of papers
INPUT DATASatellite images, aerial photos, topographic maps, DEM
/DTM,thematicmaps, rainfall,...
‐ Human Vulnerability‐material
vulnerability
‐Data base ‐information
system‐Maps‐Atlas
-Bedrock supports on pedestals
‐Permanent GPS station
Weather Stations
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
MODELERMODELER
HAZARD MAP HAZARD MAP
InputdataSatellite images, aerial photos, topographicmaps, DEM /DTM,thematicmaps, rainfall, Vegetation...
Data Processing
Data soil science
Informations Informations SoilsSoils Relief, contours, slopes...
Relief, contours, slopes...GeologysubstrateGeologysubstrate
Geology Topography Socio‐economic
Population, human activities…Population, human activities…
DATA Base DATA Base
VULNERABILITY MAPVULNERABILITY MAP
MAP OF RISK AREASMAP OF RISK AREAS
Climate Vegetation
INC NIC
INC NICCASE STUDY OF YAOUNDE CASE STUDY OF YAOUNDE Yaounde city with 7 hills is located in the area of rainforest in bimodal rainfall and meets favorable conditions morphoclimatic rapid erosion. The rapid urban growth and rural exodus has led since the early 1990s in an anarchic occupation of non-constructible areas formerly hillsides and wetlands.
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NIC
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NICDATA USEDDATA USED
Data NatureScale/cell size/surface Extension Projection Factor to be derived
ASTGM Raster 30 m .tif GCS_WGS_1984 Topography factor (LS)
Landsat ETM+ Raster 30 m .tif WGS 84/UTM zone 32 N Landuse (C)
Soils map Raster 1:1 000 000 .jpg WGS 84 Soil erodibility K (S, P)
Climatics data Microsoft Excel table / .xls / Rainfall aggressiveness(R)
Bulding data vector / shp WGS 84/UTM zone 32 N Mask (B)
Roads data vector / Shp WGS 84/UTM zone 32 N Mask (Rd)
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
WORK FLOW DIAGRAMWORK FLOW DIAGRAM
ASTGM
Monthly and annual average rainfall; (R) calculus; distribution map
for R and
convert to raster
Roads data Landsat ETM+ Soil map Climatic data Bulding data
Streep
ness m
ap
(S) in de
gree
Projection, clipping,
shapfile maskNDVI Projection;
georeferencing ; clip by study area ; shapfile map and vectorisation
Projection, clipping,
shapfile mask
Rainfall aggressiveness
R
Supervised
classification
Analyses‐interpretation; (K) calculus and converted to raster
Soils loss and issues Map (I)
Modeler overlayLS*C*K*R*B*Rd= I
Convert to raster Rd
Convert to raster (B)
Projection, clipping,
shapfile mask
Hydrological
traitment Slope
(L)
Land use map and cover management factors (C)
LS calculusConvert to raster
Topography factors (LS) Soil erodibility
factor (K)
LS*C*K*R=(F) Soil Loss map of Yaounde LS*C*K*R=(F) Soil Loss map of Yaounde
INC NIC
RESULTSRESULTS
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NICSOILS LOSS MAP OF YAOUNDE SOILS LOSS MAP OF YAOUNDE
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NICSOILS LOSS AND ISSUES MAP OF SOILS LOSS AND ISSUES MAP OF YAOUNDE YAOUNDE
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
INC NIC
Management of natural hazards in urban areas Engaging geospatial high quality and accurate dataIdentification of geospatial data producers (synergy)Topography, land use, surface runoff, drainage, road networks ... addressing, rapid response center,Compatible data and predictive models
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
CONCLUSION CONCLUSION We will continue to produce geographic
information and refine our methods based on critical and user demand.
We continue to count on the support of the UN-GGIM and the experiences of other countries.
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China
THANK YOU
UNUN--GGIM ForumGGIM Forum–– 1515--17 October 2013, Chengdu; China17 October 2013, Chengdu; China