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High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

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Sensitive zones impact/damage<br />

DESIGN OF DATA FILES<br />

<strong>High</strong> risk areas/ industries<br />

Flood plain and flash flood maps<br />

Siesmotectonic maps, storm surge maps<br />

Table App 1.2: Data model<br />

The next step is to design the cartographic layers to be entered into the system, and the<br />

spatial attributes to be assigned to them. In this regard, detail <strong>of</strong> the database, input<br />

<strong>scale</strong>, and resolution must be considered.<br />

SN FEATURES DESCRIPTION<br />

1 Cartographic layers<br />

2<br />

Selection <strong>of</strong> layers<br />

Cartographic layers are the different "maps" or "images"<br />

that will be read into the system and later overlaid and<br />

analyzed to generate synthesis information.<br />

For example, cartographic layers depicting past landslide<br />

events, geological characteristics, slope steepness,<br />

hydrology, and vegetation cover were entered and<br />

overlaid in a GIS to create a landslide hazard map<br />

There are three basic types <strong>of</strong> layers, and many different<br />

possible combinations among them: polygons<br />

(floodplains, landslide hazard areas), lines (fault lines,<br />

rivers, electrical networks), and points (epicenters, well<br />

locations, hydroelectric facilities).<br />

Selection <strong>of</strong> the correct layer type for a database depends<br />

App 6

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