Lambert Azimuthal and 1st standard

GRASS GRASS user
1

Subject: Lambert Azimuthal and 1st standard
Sender: grass-lists-owner@moon.cecer.army.mil
To: grassu-list@max.cecer.army.mil
Date: Mon, 1 May 95 17:32:38 MDT

Good Afternoon,

I am trying to get a LAEA projected image into grass. I have the laea PROJ file
set up and can display the image but it is extremely scretched west to east.

I am interested to know if I am specigying the right 1st standard parallel
when asked for by the projection menu.

What "standard parallel?" I do not recall any standard parallel for
Lambert Azimuthal Equal Area.

Basically I have an OTTER image, with
Center Lat = 44.4242
Center Lon = -122.3086

Presumably lat_0 and lon_0 or point of tangency of projection plane.

1st Standard Parallel = 45.8311 (upper latitude) is this correct ?

laea does not have a standard parallel. Has someone mixed this up
with lcc or Lambert Conformal Conic?

Also what is the standard ellipsoid that can be used with this projection
clark66 or clark80 , what are people using for the best results.

It is not a matter of "best results," its a matter of datum. Your area
appears to be in North America so it would either be NAD27's clrk66 or
NAD83's WGS80.

The stretch in the image should be about 2:1 (east west:north south)

???

Any suggestions

Thanks

Jeremy

I am certainly confused by your request. This confusion may be
furthered by the software you are attempting to use and variation of
the forms of reference as compared to those that I use in the PROJ
system (upon which the aforementioned software *may* be dependent). I
am also surprised by the use of an azimuthal projection for image
(presumably satellite) data.

Anyway, for Lambert Azimuthal Equal Area projection, there is nothing
that is normally termed "the standard parallel" nor "upper latitude."

Gerald (Jerry) I. Evenden Internet: gie@charon.er.usgs.gov
voice: (508)563-6766 Postal: P.O. Box 1027
  fax: (508)457-2310 N.Falmouth, MA 02556-1027