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This is a Ergo Training Manual for the visiting students (Eujeong Choi and Jaebeom Lee) from S. Korea. This document can be a good starting base for the official manual.



Create Ergo Input Dataset (ESRI Arc/Info Grid ASC format) from USGS shakemap data (by using QGIS)


Rasterize (vector to raster)

  • Since the data from USGS site is in vector format (polygons), it needs to be converted to ASC format for Ergo Input
  • Open the shapefile (pga.shp) in QGIS (we will create PGA raster data)
  • Rasterize the vector data by the menu: Raster - Conversion - Rasterize
    • Input file: the shapefile for conversion
    • Attribute field: Value
    • Output file: select Geotiff  and give a name (extension: tif) 
      • Note: current version of QGIS rasterizer can't support ASC format directly
    • Raster size
      • default: 3000, 3000
      • You can increase the size to decrease the file size (but sacrifice the accuracy)

Geotiff to ASC

  • Convert the format from Geotiff to ASC by the menu: Rater - Conversion - Translate
    • Input layer: the geotiff layer you created from previous step
    • Output file: select Arc/Info Grid Ascii (ASC) and give a name





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