Starget File Converter Basic Instructions (beta 0.7.7.1 Version)

Disclaimer - For assistance accessing this document or additional information
please contact radiation.questions@epa.gov.

STARGET File Converter Basic Instructions (Beta 0.7,7.1 version)

STARGET converts STAR format files (usually with .str file extension) to CAP88-PC WIND format files
(usually with .wnd file extension). STAR format fiies should have columns containing wind direction,
Pasquill category (A-F with optional G category), and fractional frequency of time the wind is from that
given direction in that Pasquill category within the specified wind speed range. The wind speed range
columns have editable column headers (double click to edit the column header). These column headers
define the midpoint of the wind speed range (in meters per second). The default values at the top of
the wind speed columns are the values corresponding to the wind speed ranges contained in the original
STAR format files that came with older versions of CAP88. These may not be appropriate for your STAR
format file.

Weather Data Fil
File Convert

ia a a

Windows

X
~
I

[ Star Data File E:\Trinity\Contract Work\EPA\EP-D-16-O20VWA4-O3_CAP88\STARGET\oid94823run.str \ <=j || S \\w&m

G Stability Array Wind Speeds

;. A Please enter the average wind speed for each column in meters per second by double clicking the
0 G Stability Array b 'v, appropriate column. The provided values are defaults that may not be correct for your data.

A - Extremely Unstable j B - Moderately Unstable C - Slightly Unstable D - Neutral E - Slightly Stable

Kasquw caie

F - Moderately Stable G - Stable

¦&
h

dp/tabs
iaders

| Directions 0.772 2.572 4.373 6.945 9.774

11.83

Wind speed colu

rnn

0.00000

0.00011

0.00000

NNE

0.00013

0.00034

0.00000

ENE

0.00012

0.00023

0.00000

0.00001

0.00023

0.00000

ESE

0.00001

0.00034

0.00000

0.00001

0.00046

0.00000

SSE

0.00013

0.00057

0.00000

0.00001

0.00023

0.00000

SSW

0.00001

0.00023

0.00000

0.00011

0.00000

WSW

0.00001

0.00046

0.00000

Status

NOTE: It is important that the wind speed column headers properly reflect the average wind speed for
the range represented by the column (e.g. for a range of 2 to 6 meters per second the column header is
4).

Installation:

Double Click StarGetlnstaller.exe, follow instructions to install. The installer will create a STARGET entry
on the Windows start menu.

Use:

Start STARGET; this typically requires accessing the entry on the Windows start menu.

-------
You can create a new file or, in most situations you will be opening an existing STAR format file. An
example STAR format file is included with the installation package (old94823run.str).

Once the STAR format file is opened, STARGET reads the data and presents it as shown in the above
image. Each Pasquill category in the STAR file is represented by its own tab (click each tab to view the
data within that category). The data displayed on the grid within each tab is the fractional frequency of
time the wind is FROM the indicated direction within the speed range defined by the column. The value
at the top of the column header is the average wind speed (meters/second) for the wind speed range
defined by the column.

If the G Stability Array box is checked then the program will include a tab for the G category. If no data
for the G category is included in the STAR file, the program will populate the G tab with zero values.

Most historic STAR files have six wind speed categories. The default values within each wind speed
column header are the values for the six historic wind speed categories. If you are not converting one
the historic STAR files, then you may have more or fewer wind speed columns, and you will need to
manually enter the wind speed column headers. Calculate the average wind speed for the range
defined by the column and enter it in the header by double-clicking on the column header. The unit for
wind speed is meters per second.

Before converting a STAR file to the CAP88-PC wind file format, the STAR file must be validated. Click
the 'check' icon (second from right on the tool bar below the menu bar). Validation checks that the total
of the wind speed frequency data over all categories and directions equals 1 (allowing for some round-
off differences).

Once the file is validated, the STAR file can be converted to the wind file format. Conversion is done by
clicking the Convert icon on the tool bar or by selecting 'Convert' on the menu bar and clicking 'Convert
Star to Wind'. A new sub-window pops up showing the various elements of the newly created wind file.
The converted file is NOT automatically saved. You must save the new wind file using the 'Save icon on
the toolbar (looks like a 3.5 inch floppy disk) or by selecting 'File' on the menu bar and clicking 'Save' or
'Save As'.

-------