census mapping – the philippine experience vincent olaivar national statistics office philippines
TRANSCRIPT
CENSUS MAPPING – CENSUS MAPPING – THE PHILIPPINETHE PHILIPPINE EXPERIENCEEXPERIENCE
Vincent OlaivarVincent OlaivarNational Statistics OfficeNational Statistics OfficePhilippinesPhilippines
The PhilippinesThe Philippines• 7,100 island7,100 island• 287,564 sq. km.287,564 sq. km.• 17 Regions17 Regions• 81 Provinces81 Provinces• 1,500 municipalities1,500 municipalities• about 42,000 Barangays about 42,000 Barangays • about 64,000 Enumeration Areas about 64,000 Enumeration Areas
(EAs)(EAs)
BackgroundBackground
EA determination/delineation EA determination/delineation
BackgroundBackground
Factors considered:Factors considered:• Population size of barangayPopulation size of barangay• Duration of census operationDuration of census operation
Mapping UnitMapping
standards group
Sets standards for preparing maps and Geographic Codes
Conducts map inventory
Evaluates base maps
Cartography group
Constructs maps based on mapping standards
Prepares enumeration area (EA) maps
Map reproduction group
Reproduces maps that will be used in census enumeration and supervision
BackgroundBackground
The NSO Mapping UnitThe NSO Mapping Unit• 21 permanent personnel21 permanent personnel• 10 personnel involved in GIS 10 personnel involved in GIS
mappingmapping• Over 1,000 personnel hired Over 1,000 personnel hired
during pre-census mappingduring pre-census mapping• Manifold softwareManifold software• 37 GPS units37 GPS units
BackgroundBackground
. .
2000 2000 CensusCensus Experience Experience
Digitized Aerial MapsDigitized Aerial Maps• Used topograhic aerial Used topograhic aerial
photographyphotography• Piloted in Metro ManilaPiloted in Metro Manila• Contracted by a domestic and Contracted by a domestic and
private corporationprivate corporation• January to September 2000January to September 2000
2000 2000 CensusCensus Experience Experience
Problems Encountered (maps using Problems Encountered (maps using aerial photography) aerial photography)
• Maps not delivered on timeMaps not delivered on time• Delineation/Demarcation not Delineation/Demarcation not
accurateaccurate• Lack detailed street names and Lack detailed street names and
landmarkslandmarks
2000 2000 CensusCensus Experience Experience
Problems Encountered (sketch map-Problems Encountered (sketch map-based) based)
• Base maps used are not very Base maps used are not very accurateaccurate
• Most have only the boundaries Most have only the boundaries digitizeddigitized
• Those with street patterns and Those with street patterns and landmarks are not very accuratelandmarks are not very accurate
. .
2007 2007 CensusCensus Experience Experience
Satellite Image MapsSatellite Image Maps• Used available Google Earth Used available Google Earth
satellite imagessatellite images• Converted some of these images Converted some of these images
into GIS maps using Manifoldinto GIS maps using Manifold
2007 2007 CensusCensus Experience Experience
Problems Encountered (Satellite image Problems Encountered (Satellite image maps) maps)
• Google Earth map images not Google Earth map images not available in most of the rural areasavailable in most of the rural areas
• Some images are cloud-blurredSome images are cloud-blurred
. .
2007 2007 CensusCensus Experience Experience
GPS hand-held devicesGPS hand-held devices• Did some studies/ comparison on Did some studies/ comparison on
GPS and GIS positional accuracy GPS and GIS positional accuracy and consistencyand consistency
• Sketch maps update (incl. land Sketch maps update (incl. land mark identification and road mark identification and road tracking)tracking)
2007 2007 CensusCensus Experience Experience
Problems Encountered Problems Encountered (GPS hand-held devices) (GPS hand-held devices)
• Number of units not enough to Number of units not enough to update all sketch mapsupdate all sketch maps
• Weather dependentWeather dependent• ExpensiveExpensive• Field-work intensiveField-work intensive
2010 Census Plans2010 Census Plans
Avail more GPS unitAvail more GPS unit Maximize use of satellite images Maximize use of satellite images
since these images are quite since these images are quite accurateaccurate
Use of GPS in updating sketch Use of GPS in updating sketch map-based GIS mapsmap-based GIS maps
Use of GIS maps in pre-Use of GIS maps in pre-enumeration and enumeration enumeration and enumeration activitiesactivities
Capitalize on GIS development Capitalize on GIS development
2010 Census Plans2010 Census Plans
Capitalize on GIS development in Capitalize on GIS development in the Local Government Unitsthe Local Government Units
