Transcript Use of aerial frames for agricultural censuses and surveys-Fiji experience

USE OF AERIAL FRAMES
FOR AGRICULTURAL
CENSUSES AND SURVEYS
Fiji Experience
INTRODUCTION
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Aerial Frame methodology was introduced in Fiji
during the last 1991 agriculture census project.
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It was an alternative methodology given that there
were a lot of errors in the proposed methodology as
previously used in the 1978 census i.e. List and cluster
sampling methodology. (errors in overlapping /
duplication and omissions)
AREA FRAME PROCEDURES FOR
1991 AGRICULTURE CENSUS
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Divided the whole country into small blocks
without any overlapping and omission that have
identifiable physical features
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Overlayed the Population Census EA boundaries
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Stratification of EA boundaries into nine strata
according to the importance, intensity and type
of land use
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Further, the whole country was sub divided in to
21 sub-stratas. This activity guaranteed the
sample allocation between crops.
STRATIFICATION SUMMARY
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Nine Stratas
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Strata 10:
Strata 20:
Strata 30:
Strata 40:
Strata 50:
Strata 60:
Strata 70:
Strata 80:
Strata 90:
70 -100% Cultivation
30 - 69% Cultivation
10 – 29% Cultivation
91 – 100% Pastures
100% Forests [No Census]
100% Non Agriculture land [No Census]
100% Cities & Towns [No Census]
100% Special Farms
100% Big agriculture holdings [freeholds
etc]
PREPARATION OF AREA FRAME
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Transferred all EA boundaries on to topo maps
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Manually stratified the EAs on topo maps including substratification procedures
Numbering of grid boxes on stratified EA maps on a
serpentine manner
Randomly selected the 1294 samples
Manually transfer the selected segments boundaries on to
contact aerial photo following identifiable physical features
with no disturbance to the area of segment
Used planimeter to calculate the area of segment on aerial
photo
Prepared photo enlargements with all corresponding details
laminated properly before sending to the field.
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ACTIVITIES UNDERTAKEN
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Pilot Census conducted whereby all amendments
were incorporated in the final version of survey
instruments
Selected 1294 SMs [photo enalrgements] as final
sample for census
Conducted two separate trainings; Supervisors
[2wks] & Enumerators [2wks]
Two months of Data collection [Jun-Jul]
Conducted 7 months of data processing using SAS
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