Page 324 - Special Topic Session (STS) - Volume 4

STS700 Candigo J. A., Jr. et al.
administrative levels which are classified either as urban or rural. Latest
classification is as of 2015.
3. Using a map with provincial boundaries, extract the rural barangays by
subtracting the identified urban barangays. At this point, the result is
a map of rural areas with provincial boundaries.
4. The map of rural areas was superimposed to a gridded population map
(with reference year 2015) taken from WorldPop .
3
5. Apply the “Sum” operation of the “Zonal statistics” function of QGIS to
estimate the total rural population (TRP). A gridded population map of
rural areas is also generated at this point.

Part 2 –Identifying the 2-kilometer radius from an all-season road
For the purpose of this study, all-season roads refer to national, provincial
4
and municipal roads . The following steps are then employed:
1. From the road network map of the Philippines, identify all-season
roads.
2. Using QGIS, map the 2-kilometer radius surrounding all-season roads

Part 3 – Estimating the rural population within the 2-kilomter radius from
an all-season road
1. Overlay the gridded population map (from Part 1 Step 4) to the map
showing the 2-kilometer radius from an all-season road (from Part 2
Step 2) to estimate the rural population living within the 2-kilometer
radius from an all-season road.
2. Apply the “Sum” operation of the “Zonal statistics” function of QGIS to
estimate the total rural population living within the 2-kilometer radius
from an all-season road (TRP2KM). At this point, a gridded total rural
population map within 2-kilometer radius from an all-season road is
also generated.

Part 4 – Computing for the Rural Access Index (RAI)
To compute for the RAI, the following formula is used:

2
= 100

where TRP2KM = total rural population living within the 2-kilometer radius
from an all-season road

TRP = total rural population

3 https://www.worldpop.org/
4 https://psa.gov.ph/content/road-classification
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