[fdo-internals] Updated RFC 11 - Area and Length functions

[Haris Kurtagic]

Hi Orest,

When you sad: " We will post these functions as fdo common utilities
so that other provider writers can use them as well if they choose.", I
was thinking that we will get in FDO way written functions for proj4
calculations.

What I mean, if we want to use proj4 in other provider it would be great
that we don't need to learn proj4. 
Having FDO functions, which use's FDO geometry spatial context..., and
perfoming proj4 calls is something which would be very good.

Yes, I am not talking just about RFC 11.

Haris



-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Orest
Halustchak
Sent: Thursday, September 13, 2007 10:11 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Updated RFC 11 - Area and Length functions

Hi Haris,

The purpose of this isn't to introduce projection support via proj4 into
the fdo api. That would be a separate discussion outside of this rfc.

Are you asking about an api wrapper around utility functions to compute
length and area that you could use? I think that would make sense as
utility functions.

Orest.

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris
Kurtagic
Sent: Thursday, September 13, 2007 4:05 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Updated RFC 11 - Area and Length functions

Is there going to be an FDO API (wrapper) for easier proj4 usage ?

Haris

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Orest
Halustchak
Sent: Thursday, September 13, 2007 7:56 PM
To: FDO Internals Mail List
Subject: [fdo-internals] Updated RFC 11 - Area and Length functions

Hi,

Based on the feedback to RFC 11, the RFC has been updated.
	
http://trac.osgeo.org/fdo/wiki/FDORfc11

>From the discussion, we kept the 2D requirement but made it clearer
that
Z is skipped in the calculation. We could add separate 3d functions at a
future date.

The main change is for geodetic data. The RFC now calls for a ground
distance or area in metres or square-metres to be returned using a
calculation based on "general accepted formulae". For providers that do
not have a native coordinate system library, our intention is to reuse
code from proj4 for the length calculation and also to adapt it for an
area calculation. We will post these functions as fdo common utilities
so that other provider writers can use them as well if they choose.

Thanks,
Orest.


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