DATA AND METHODS USED
For our users' reference, listed below are the sources of the data used in the computations and the methods that the GeoRiskPH team used to calculate the results of the hazard assessment analytics for land area, population, and elements-at-risk.
Method for Computing the Total Land Area Prone to Hazard
The total land area prone to a particular hazard is computed by first obtaining the land area of a location using the administrative boundary layer. The area within the location that is prone to hazard is then obtained by intersecting the hazard layer and the administrative boundary layer. The total land area of the location that is prone to hazard is divided by the land area of the location's boundary to get the percentage of the total land area prone to hazard.
Method for Computing the Total Male/Female Prone to Hazard (per age group)
The total male/female population of a particular age group that are prone to a particular hazard is computed by first obtaining the sum of all male or female population of an age group (e.g. ages 0-10) residing in a particular barangay. The barangay's percentage of land area prone to hazard is also computed by dividing the barangay's total land area intersected by the hazard with the barangay's total land area. Multiply this percentage with the total male or female of an age group to obtain the barangay's total male or female population within a particular age group that are prone to hazard. If computing for total male or female population of a particular age group residing within a municipality/city or province district, perform the same process but for all barangays within the chosen location. Upon obtaining the total male or female population for each barangay, sum the values to obtain the overall total.
Method for Computing the Total Facilities Prone to Hazard
The total number of facilities prone to a particular hazard is computed by first obtaining the total number of facilities within a particular location by intersecting the facilities layer with the location's administrative boundary. Upon intersecting the results with the chosen hazard, count the results to obtain the total facilities prone to the hazard.
Method for Computing the Total Land Area Prone to Hazard
The total land area prone to a particular hazard is computed by first obtaining the land area of a location using the administrative boundary layer. The area within the location that is prone to hazard is then obtained by intersecting the hazard layer and the administrative boundary layer. The total land area of the location that is prone to hazard is divided by the land area of the location's boundary to get the percentage of the total land area prone to hazard.
| Data | Source | |
|---|---|---|
| Population | PSA | |
| Schools | DepEd | |
| Health Facilities | DOH |
Seismic |
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|---|---|---|
| Data | Source | |
| Earthquake-induced Landslide | DOST-PHIVOLCS | |
| Fissures | DOST-PHIVOLCS | |
| Ground Rupture | DOST-PHIVOLCS | |
| Ground Shaking | DOST-PHIVOLCS | |
| Liquefaction | DOST-PHIVOLCS | |
| Tsunami | DOST-PHIVOLCS | |
Volcanic |
||
| Data | Source | |
| Ballistic Projectiles | DOST-PHIVOLCS | |
| Base Surge | DOST-PHIVOLCS, 2011 | |
| Lahar | DOST-PHIVOLCS | |
| Lava | DOST-PHIVOLCS | |
| Pyroclastic Flow | DOST-PHIVOLCS | |
| Seiches | DOST-PHIVOLCS | |
Hydrometeorologic |
||
| Data | Source | |
| Flood | DENR-MGB, 2018 | |
| Rain-Induced Landslide | DENR-MGB, 2018 | |
| Severe Wind (20-YRP) | DOST-PAGASA | |
| Severe Wind (500-YRP) | DOST-PAGASA | |
| Storm Surge | DOST-PAGASA | |