Monthly Archives: February 2014

Banjir Jakarta

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150 cm
Class 4: Reported that the area is affected, but there is no water level information yet.
Next, we are entrying the data using QGIS 2.0. We are using sub-villages boundary from OpenStreetMap. We are pulling the vector file from OpenStreetMap then we set the attributes table like this:

attribute_table
KAB_NAME is District, KEC_NAME is Sub-District, KEL_NAME is Village, and RW is sub-village
We are adding new column, “affected” and “tinggi”. To indicate that a sub-village is affected by flood, we give value 1. And to indicate the water level class, we put value based on water level class inside “tinggi” column. We are putting the value based on the report given by BPBD staff. The longer the report (meaning lot of sub-village affected), the longer the entry data process. It can take 1-2 hours during intense flood, even more.

Phase 2: Symbology setting

After data entry, we are setting up the symbology. QGIS 2.0 layer properties UI is quite simple and easy to understand. We can set the symbology based on value from a column. If we want to show affected sub-villages, we are using “affected” column. But if we want to show water level classification, we are using “tinggi” column. Other symbology such as boundary needs to be set up too, so the map will be easy to understand and anyone can read it 🙂

atur

Phase 3: Layouting

composer
Layouting maps in QGIS 2.0
Designing a map layout is setting up a final map so the map will be ready to print and distribute. We are paying attention the maps component such as title, scale, legend, etc. The layout should be designed perfectly, and each component has meaning. The more information that you put into layout, then the map will be more amenable. Since people would know where they have to reach if there is something wrong with the map. So, if you want to display the map, it should be displayed completely with the additional information 🙂

All final products can be seen at http://bpbd.jakarta.go.id/peta-banjir/

For chronological map animation, actually it’s a group of map that we designed with the same symbology and layout. And we compiled those maps based on time-series. All maps are joined with GIF creator software (GIFFun is good enough for OSX, in case you wondering 🙂 )

Want to learn more about OSM and QGIS? We have the guide: http://openstreetmap.or.id/resources/guide/

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Emir Hartato

This entry was posted in News and tagged banjir, Bencana, berita, BPBD, Disaster, flood, jakarta, maps, news, open source, openstreetmap, OSM, peta, qgis by emir. Bookmark the permalink.” title=”Banjir Jakarta”>Banjir Jakarta