[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20040427: Level II vs Level II displays

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 20040427: Level II vs Level II displays
  • Date: Tue, 27 Apr 2004 07:49:16 -0600 (MDT)
Gerry et al.,

Visually, the Level III NIDS products are distributed in a local polar
stereographic projection. The Level II product displays are in a lat/lon
coordinate system. The echoes should be at the same geographic location.
Visually, if you loop between the two, you have to account or two different
projections. Latlon line, map features, etc will of course be projected in each
coordinate system.

Steve Chiswell
Unidata user Support





On Tue, 27 Apr 2004, Gerry Creager N5JXS wrote:

> Can you send your parameter files for NMAP2?
>
> And, have you tried comparing the Level III NMAP2 vs GPNEXR2 and the
> same site's Level II?
>
> Rob Dale wrote:
> > Looking at NIDS BREF1 products from any site (I've tried KDMX & KDTX) and
> > comparing them using Nmap2 with Level II data is showing a notable
> > difference... The map background shifts over for L2 data by about 20 miles
> > to the east and a smidge south. The echoes are in the same spot, obviously
> > looking somewhat different, but the map itself moves over so it appears to
> > be showing the rain in an area where it's not actually at. I've compared L2
> > DTX vs neighboring NIDS and the issue is the same.
> >
> > Any idea if there's a bad lat/long somewhere or is it a bigger issue?
> >
> >  - Rob
>
> --
> Gerry Creager -- address@hidden
> Texas Mesonet -- AATLT, Texas A&M University
> Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
> Page: 979.228.0173
> Office: 903A Eller Bldg, TAMU, College Station, TX 77843
>