Hi:

It seems everything to be correct, but if it is also for automation, I would suggest making explicit the coordinates (latitude 0 and longitude 0) of ORIGIN (that it is Greenwich), because it may change, depending on the period and location. 

Happy New Year, 2022,  to all!

Lucia Lovison

On Mon, Dec 27, 2021 at 8:31 AM LOUISE RATLIFF <[log in to unmask]> wrote:

Hello all, 

Here is the documentation on the Marc 034 field for the coordinates.  They seem to all use leading zeroes so that there is a consistency in the number of digits used for all of the W, E, S, N values. This is no doubt for ease of machine manipulation.

But I do remember when I input the 255 values, I did not always include leading zeroes; I made sure that all of the values had the same number of digits, though.

So I think I agree with Tim.

Cheers, and Happy New Year!

Louise Ratliff

Retired UCLA map cataloger

$g - Coordinates - southernmost latitude

Subfields $d, $e, $f, and $g individually identify the four coordinates of the item. Subfield $d represents the westernmost extent of the item; subfield $e, the easternmost extent; subfield $f, the northernmost extent; and subfield $g, the southernmost extent. The abbreviations for the hemispheres are: N = North, S = South, E = East, W = West.

Subfields $d, $e, $f, and $g always appear together. The coordinates may be recorded in the form hdddmmss (hemisphere-degrees-minutes-seconds), however, other forms are also allowed, such as decimal degrees. The subelements are each right justified and unused positions contain zeros.

Examples in degrees/minutes/seconds: hdddmmss (hemisphere-degrees-minutes-seconds):

034	1#$aa$b22000000$dW1800000$eE1800000$fN0840000$gS0700000
034	1#$aa$b253440$dE0790000$eE0860000$fN0200000$gN0120000 [The above two examples illustrate records for flat maps or flat maps in atlases.]

Example in decimal degrees: hddd.dddddd (hemisphere-degrees.decimal degrees):

034	1#$aa$dE079.533265$eE086.216635$fS012.583377$gS020.419532

Example in decimal degrees: +-ddd.dddddd (hemisphere[+/-]-degrees.decimal degrees) (“+” for N and E, “-“ for S and W; the plus sign is optional):

034	1#$aa$d+079.533265$e+086.216635$f-012.583377$g-020.419532

Example without the optional plus sign:

034	1#$aa$d079.533265$e086.216635$f-012.583377$g-020.419532

Example in decimal minutes: hdddmm.mmmm (hemisphere-degrees-minutes.decimal minutes):

034	1#$aa$dE07932.5332$eE08607.4478$fS01235.5421$gS02028.9704

Example in decimal seconds: hdddmmss.sss (hemisphere-degrees-minutes-seconds.decimal seconds):

034	1#$aa$dE0793235.575$eE0860727.350$fS0123536.895$gS0202858.125

If the coordinates are given in terms of a center point rather than outside limits, the longitude and latitude which form the central axis are recorded twice (in subfields $d and $e and in $f and $g, respectively).

034	1#$aa$b75000$dW0950500$eW0950500$fN0303000$gN0303000
034	1#$aa$dW119.697222$eW119.697222$fN034.420833$gN034.420833
034	1#$aa$d-119.697222$e-119.697222$f+034.420833$g+034.420833
034	1#$aa$dW11941.833333$eW11941.833333$fN03425.250000$gN03425.250000

034	0#$dW0735848$eW0735848$fN0404554$gN0404554 [Coordinates of Carnegie Hall, a concert venue depicted in an image.]

On Mon, Dec 20, 2021 at 7:57 AM Angela R Cope <[log in to unmask]> wrote:

Extent Update

1) The base map choices have been added (lower right)

2) Can anyone look at the MARC layouts in Extent and give feedback? Do any of the formats require  MARC leading zeros?

3) Coordinates must be entered in order of W, E, N ,S to validate, so something like -100,-90,36,28 (when you click on "coordinates," the search button says not valid but once you enter in coordinates such as this example, the buttons refreshes to valid)

Anything else??

Angie