GREAT-ER: Managing catchments.dbf of GREAT-ER 1

Managing catchments.dbf of GREAT-ER 1

The small datafile catchments.dbf of GREAT-ER 1.0.x (placed in %GHOME%\catchments)defines the set of installed catchments and is used for selections. The file stores the catchments ID, the directory where it is installed and the country for which background data can be shown.

Format

ID	Characters (20)	ID of catchment, used for selection in user interface
dir	Characters (20)	Directory name where catchment is installed (which is in %GHOME%\catchments)
country	Characters (5)	Country code (directory name in %GHOME%\overview, e.g. "de" for Germany, "uk" for United Kingdom, which the ArcInfo coverages pppoint, pppoly, rdline, rrline of VMAPL0 (DCW)). The background data can be download e.g. from http://www.maproom.psu.edu/dcw/.

How to create

From a simple text file ('catchments.txt') with tabulator as delimiter such as

ID      dir     country
Aire    aire    uk
Calder  calder  uk
Don     don     uk
Itter   itter   de
Lambro  lambro  it

the dbf-file ('catchments.dbf') can be created using e.g. txt2dbf:

txt2dbf -C20 -C20 -C5 -v catchments.txt catchments.dbf

How to merge

Adding a catchment dataset to a GREAT-ER installation sometimes includes the problem to join the contents of two lists catchment.dbf.

This could be done in various ways with tools that can read and write the dbf-format.

One option is to use the counterpart of txt2dbf, dbf2txt, to create text files that can easily be merged with a text editor.

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