by Rosalinda M Garcia Bureau of Agricultural Statistics Minerva Eloisa P Esquivias National Statistics Office Regional Workshop on Sampling for Agricultural Censuses and Surveys ID: 447197
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Using Area Frame for Agricultural Censuses and Surveys: The Philippines Experience
by:Rosalinda M. Garcia, Bureau of Agricultural StatisticsMinerva Eloisa P. Esquivias, National Statistics Office
Regional Workshop on Sampling
for Agricultural Censuses and Surveys
May 14–18, 2012
Bangkok, ThailandSlide2
Outline
IntroductionThe BAEcon Area Sampling Frame StudyThe Area Frame Study for the CensusConcluding NotesSlide3
Introduction
Area Frame – sampling frame where segments of land are sampling unitsList Frame – listing of holdings or HoldersMultiple Frame – combination of Area Frame and List FrameSlide4
Introduction
Area Frame Its stability is its strength, thus non-sampling errors are reduced.Data collection is based on land units that are fixed.Not integrated in the Philippine Agricultural Statistical System.Two Experiments/studies were undertakenThe BAEcon Area Sampling Frame StudyThe Area Frame Study for the CensusSlide5
The BAEcon
Area Sampling Frame StudyDone by the Bureau of Agricultural Economics (BAEcon), now known as the Bureau of Agricultural Statistics (BAS)Done in 1980 under a Project between Government of the Philippines and USAIDConducted for only one province (Pangasinan)Area Sampling Frame (ASF) estimates were compared with Rice and Corn Survey (RCS) estimates Slide6
The BAEcon
Area Sampling Frame StudyArea Sampling Frame for Pangasinan:Made use of Landsat imagery, aerial photography and topographic mapsConducted a pilot survey using random sample of 72 segments, approx. 25 ha. in sizeObserved standing crops; measured crop area; interviewed farmers to determine crop production for past six monthsSlide7
The BAEcon
Area Sampling Frame StudyArea Sampling Frame for Pangasinan:Compared estimates obtained from area frame survey and BAEcon’s Rice and Corn Survey where samples were obtained from a List FrameResultsASF estimate of harvested area for rice was 28% higher than RCS estimate for July-December 1979 ref. periodASF estimate of rice production was 18% higher than RCS estimateASF estimates for corn area harvested and production were a lot lower than the RCS estimatesSlide8
The BAEcon
Area Sampling Frame StudyArea Sampling Frame for Pangasinan:Involved a small experiment which yielded inconclusive results Needs more current aerial photography and use of multitemporal Landsat ImageryCost was formidableSlide9
The Area Frame Study for the Census
Done by the National Statistics Office, the Bureau of Agricultural Statistics, and the Statistical Research and Training Center.Done in 2006 under a Project between the three statistical offices for the 2012 Census of Agriculture and Fisheries (CAF).Conducted in the municipality of Quirino in Isabela province.Slide10
The Area Frame Study for the Census
Area Frame Experiment in Quirino, Isabela:Made use of Landsat imagery, Google Earth imagery, NAMRIA topographic maps and NSO provincial/ municipality/barangay shape files.
Conducted ground
truthing
Adopted the LUCAS procedure using point sampling frame.
PSUs and SSUs were located using GPS and magnetic compass.
Recording
the characteristics of sample points on survey questionnaire.Slide11
Results revealed that technology was viable to complement the list frame.
Cost of acquiring high-resolution satellite spatial imagery is decreasing.LandSat imagery can be used in stratifying land cover/land use strata.Google Earth images can be used as alternative to the costly ground truthing activity.Assessment (Steering Committee)No immediate relevance Required satellite maps as a tool are unavailable for all provincesThe Area Frame Study for the CensusSlide12
Limitations of Using Area Frame for Philippine agricultural surveys
CostHeterogeneity nature of agriculture in the country.Farm parcels are becoming smaller.Mixed cropping on the same parcel is applied to maximize use of area.Not all farmers follow same cropping cycle in locality, thus several activities may happen in adjacent parcels.Concluding NotesSlide13
More in-depth studies could be made to look into the various agricultural practices in the country.
Area Frame experts, program implementers need to consider situation of farmers in particular and agriculture situation in general to serve as inputs in the planning for and in using area frame.Capability building for staffProcurement of high resolution imagesConcluding NotesSlide14
Thank You!
URL: www.bas.gov.phEmail: info@bas.gov.phURL: www.census.gov.phEmail: info@census.gov.ph