Re: insitu longitude conversions

[Joe McLean <joe.mclean@xxxxxxxx>]

Hi Enils,

The relevant code is a subroutine in $lasroot/server/Ferret.pl called
fixLongitude.  I would suggest though that instead of changing this code, you
reverse the calculation in your custom.pl script, leaving the core LAS code
intact.  $self->{props}->{x_lo}, $self->{props}->{refmap_xhi}, and
$self->{props}->{jnl_x} (there may be others) are all available to the custom.pl
script.

Joe
------------------------------

Enils Bashi wrote:

> Dear LAS users,
>
> I would like to know where the longitude conversion is done in the
> insitu/las/ferret files. When my x (lon) is negative is converted to
> positive with the equivalent value from 0-360degrees. To better understand
> what I am talking about please take a look at the output from
> GenericLAS_debug.txt
>
> Region: -76.5 -75.15 x
> Region: 37.5 38.6 y
> Region: 01-Apr-2003 01-Apr-2003 t
> ferret prop: x_lo = 283.5
> ferret prop array: dataset_name = (mydb/bishopville)
> ferret prop: y_lo = 37.5
> ferret prop array: jnl_t = (01-Apr-2003,01-Apr-2003)
> ferret prop: size = .5
> ferret prop: script_prefix = cbay_
> ferret prop: refmap_xlo = 283.5
> ferret prop: view = xy
> ferret prop array: jnl_x = (283.5,284.85)
> ferret prop: refmap_ylo = 37.5
> ferret prop: fill_type = fill
> ferret prop: refmap_yhi = 38.6
> ferret prop: t_lo = 01-Apr-2003
> ferret prop: y_hi = 38.6
> ferret prop array: jnl_z = ()
> ferret prop: refmap_xhi = 284.85
> ferret prop: variable_name_0 = temp
> ferret prop: format = shade
> ferret prop: t_hi = 01-Apr-2003
> ferret prop: rank = 2
> ferret prop array: variable_name = (temp)
> ferret prop array: jnl_y = (37.5,38.6)
> ferret prop: x_hi = 284.85
>
> As result the following query does not return anything since, there are no x
> that meet that criteria in the MySQL database.
>
> --- Calling: LAS::Server::Ferret::preExecuteHook
> Creating new TMAP::DBI::Dataset
> getExternalData: calling getData
> getExternalData: data read/write error: TMAP::DBI::Dataset : No data was
> returned with the query:
> SELECT t,temp,x,y,z
> FROM bishopville
> WHERE x >= 283.5 AND x <= 284.85 AND (y>=37.5 AND y<=38.6) AND (z>=0 AND
> z<=0) AND (t>=20030401000000 AND t<=20030401000000)
> -----------------------------
>
> Any and all feedback would be greatly appreciated.
>
> Enils Bashi
> Programmer - Chesapeake Bay Program
> Veridyne Incorporated
> Annapolis, Maryland: (410) 267-9833
> www.chesapeakebay.net