You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@sis.apache.org by Martin Desruisseaux <ma...@geomatys.fr> on 2014/01/10 12:06:18 UTC
Axes conventions: what are your needs?
Hello all
I committed a first proposal for an AxesConvention enumeration [1]. This
enumeration is not part of any OGC/ISO standard. It does not provide any
new functionality, but tries to make some common patterns easier to use.
The vast majority of Geographic CRS defined in the EPSG database use the
(latitude, longitude) axis order with longitudes in the [-180 … +180]°
range. However many developers and existing softwares prefer the
(longitude, latitude) axis order. This mismatch occurs so often that it
is worth to provide a mechanism telling "use the CRS as defined in the
EPSG database except that axis order shall be (longitude, latitude)
rather than (latitude, longitude)". This is the purpose of the
RIGHT_HANDED enumeration value.
An other common pattern is "use the CRS as defined in the EPSG database
except that the range of longitude values shall be [0 … 360]° instead of
[-180 … +180]°". This is the purpose of the POSITIVE_RANGE enumeration
value.
Does anyone has other common patterns that we could add in the
AxesConvention enumeration, or any comment on the currently proposed
patterns?
Martin
[1]
https://builds.apache.org/job/sis-jdk7/site/apidocs/org/apache/sis/referencing/cs/AxesConvention.html
Re: Axes conventions: what are your needs?
Posted by Martin Desruisseaux <ma...@geomatys.fr>.
Thanks George :-)
If anyone else has clarification request or proposal, or would like
change, feedbacks are always welcome.
Martin
Le 11/01/14 00:32, GEORGE PERCIVALL a écrit :
> Martin,
>
> Surprisingly, coordinate order is a tricky issue. Your description is well written.
>
> George
>
>
>
> On Jan 10, 2014, at 5:06 AM, Martin Desruisseaux <ma...@geomatys.fr> wrote:
>
>> Hello all
>>
>> I committed a first proposal for an AxesConvention enumeration [1]. This enumeration is not part of any OGC/ISO standard. It does not provide any new functionality, but tries to make some common patterns easier to use.
>>
>> The vast majority of Geographic CRS defined in the EPSG database use the (latitude, longitude) axis order with longitudes in the [-180 … +180]° range. However many developers and existing softwares prefer the (longitude, latitude) axis order. This mismatch occurs so often that it is worth to provide a mechanism telling "use the CRS as defined in the EPSG database except that axis order shall be (longitude, latitude) rather than (latitude, longitude)". This is the purpose of the RIGHT_HANDED enumeration value.
>>
>> An other common pattern is "use the CRS as defined in the EPSG database except that the range of longitude values shall be [0 … 360]° instead of [-180 … +180]°". This is the purpose of the POSITIVE_RANGE enumeration value.
>>
>> Does anyone has other common patterns that we could add in the AxesConvention enumeration, or any comment on the currently proposed patterns?
>>
>> Martin
>>
>>
>> [1] https://builds.apache.org/job/sis-jdk7/site/apidocs/org/apache/sis/referencing/cs/AxesConvention.html
>>
> George Percivall
> gpercivall@opengeospatial.org
> http://www.linkedin.com/in/gpercivall
> @Percivall on Twitter
> +1-301-560-6439
> http://www.opengeospatial.org/
> OGC -- Making Location Count
>
>
>
Re: Axes conventions: what are your needs?
Posted by GEORGE PERCIVALL <gp...@opengeospatial.org>.
Martin,
Surprisingly, coordinate order is a tricky issue. Your description is well written.
George
On Jan 10, 2014, at 5:06 AM, Martin Desruisseaux <ma...@geomatys.fr> wrote:
> Hello all
>
> I committed a first proposal for an AxesConvention enumeration [1]. This enumeration is not part of any OGC/ISO standard. It does not provide any new functionality, but tries to make some common patterns easier to use.
>
> The vast majority of Geographic CRS defined in the EPSG database use the (latitude, longitude) axis order with longitudes in the [-180 … +180]° range. However many developers and existing softwares prefer the (longitude, latitude) axis order. This mismatch occurs so often that it is worth to provide a mechanism telling "use the CRS as defined in the EPSG database except that axis order shall be (longitude, latitude) rather than (latitude, longitude)". This is the purpose of the RIGHT_HANDED enumeration value.
>
> An other common pattern is "use the CRS as defined in the EPSG database except that the range of longitude values shall be [0 … 360]° instead of [-180 … +180]°". This is the purpose of the POSITIVE_RANGE enumeration value.
>
> Does anyone has other common patterns that we could add in the AxesConvention enumeration, or any comment on the currently proposed patterns?
>
> Martin
>
>
> [1] https://builds.apache.org/job/sis-jdk7/site/apidocs/org/apache/sis/referencing/cs/AxesConvention.html
>
George Percivall
gpercivall@opengeospatial.org
http://www.linkedin.com/in/gpercivall
@Percivall on Twitter
+1-301-560-6439
http://www.opengeospatial.org/
OGC -- Making Location Count