[Proj] Lease block definition

Dean C.Mikkelsen dcmikkelsen at terraetl.com
Mon Sep 1 12:43:43 EDT 2008

Hi everyone,

Here is a useful site on the GOM Lease Blocks:


If you have any questions, let me know.


On Mon, 1 Sep 2008 10:43:54 -0500
  "Noel Zinn" <ndzinn at comcast.net> wrote:
> The US Outer Continental Shelf (Gulf of Mexico anyway) 
>lease blocks are
> defined in NAD27 UTM by zone (so extended coverage per 
>the recent threat is
> of no relevance), but in US Survey Feet.  These are 
>federal waters.  State
> waters are defines SPCS27.
> Google "protraction diagram" and you'll find all the 
>information you'll
> need.
> Noel
> -----Original Message-----
>From: proj-bounces at lists.maptools.org
> [mailto:proj-bounces at lists.maptools.org] On Behalf Of 
>Gerald I. Evenden
> Sent: Monday, September 01, 2008 9:31 AM
> To: PROJ.4 and general Projections Discussions
> Subject: [Proj] Lease block definition
> A few weeks ago the item of oil lease blocks came up as 
>an item to be
> plotted 
> on extended range TM maps.  My encounter with lease 
>blocks was only as a 
> short spectator of someone digitizing the irregular 
>shore boundaries of said
> lease blocks.
> My understanding is that the lease block boundaries are 
>established in terms
> of UTM grid coordinates?  If so, what are the typical 
>side lengths in
> meters?
> My recollection was that one of the reasons for 
>selecting TM for large area 
> mapping was because of "facilitating" the plotting of 
>lease blocks.  True, 
> false?
> Any information related to what has been done or 
>proposed for large region 
> mapping with TM would be appreciated.
> -- 
> The whole religious complexion of the modern world is 
> to the absence from Jerusalem of a lunatic asylum.
> -- Havelock Ellis (1859-1939) British psychologist
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj

Dean C. Mikkelsen, B.Sc., P.Eng.
Upstream Oil & Gas Geodesy and Information Management

E-mail: dcmikkelsen at terraetl.com


More information about the Proj mailing list