[
https://issues.apache.org/jira/browse/SIS-353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Martin Desruisseaux updated SIS-353:
------------------------------------
Description:
The Universal Transverse Mercator (UTM) is not strictly divided in 6° width
zones. There is exceptions for Norway and Svalbard, for historical reasons (UTM
seems to have been designed by military around World War II).
* Between 56°N and 64°N, zone 32 is widened to 9° (at the expense of zone 31)
to accommodate southwest Norway.
* Between 72°N and 84°N, zones 33 and 35 are widened to 12° to accommodate
Svalbard. To compensate for these 12° wide zones, zones 31 and 37 are widened
to 9° and zones 32, 34, and 36 are eliminated.
A nice image of UTM grid including the special cases is [available on Wikimedia
common|https://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg] (see
the 31X, 33X, 35X, 37X and 32V cells). This image also covers the UPS cases (A,
B, Y and Z cells, discussed below).
Since the {{CommonCRS.UTM(double, double)}} method already expects latitude and
longitude arguments, it can easily be fixed without API change. However it
would be a slight change in its behavior. An alternative is to deprecate the
current {{UTM(double, double)}} method and create a new {{universal(double,
double)}} method instead. That {{universal}} method would handle not only the
Universal Transverse Mercator (UTM) projection with the above-cited special
cases, but also Universal Polar Stereographic (UPS) projections for latitudes
north of 84°N or south of 80°S.
was:
The Universal Transverse Mercator (UTM) is not strictly divided in 6° width
zones. There is exceptions for Norway and Svalbard, for historical reasons (UTM
seems to have been designed by military around World War II).
* Between 56°N and 64°N, zone 32 is widened to 9° (at the expense of zone 31)
to accommodate southwest Norway.
* Between 72°N and 84°N, zones 33 and 35 are widened to 12° to accommodate
Svalbard. To compensate for these 12° wide zones, zones 31 and 37 are widened
to 9° and zones 32, 34, and 36 are eliminated.
A nice image of UTM grid including the special cases is [available on Wikimedia
common|https://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg] (see
the 31X, 33X, 35X, 37X and 32V cells). This image also covers the UPS cases (A,
B, Y and Z cells, discussed below).
Since the {{CommonCRS.UTM(double, double)}} method already expect latitude and
longitude, it can easily be fixed without API change. However it would be a
slight change in its behavior. An alternative is to deprecate the current
{{UTM(double, double)}} method and create a new {{universal(double, double)}}
method instead. That {{universal}} method would handle not only the Universal
Transverse Mercator (UTM) case with its special cases, but also Universal Polar
Stereographic (UPS) cases.
> UTM should take in account Norway and Svalbard special cases
> ------------------------------------------------------------
>
> Key: SIS-353
> URL: https://issues.apache.org/jira/browse/SIS-353
> Project: Spatial Information Systems
> Issue Type: Improvement
> Components: Referencing
> Affects Versions: 0.7
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Fix For: 0.8
>
>
> The Universal Transverse Mercator (UTM) is not strictly divided in 6° width
> zones. There is exceptions for Norway and Svalbard, for historical reasons
> (UTM seems to have been designed by military around World War II).
> * Between 56°N and 64°N, zone 32 is widened to 9° (at the expense of zone 31)
> to accommodate southwest Norway.
> * Between 72°N and 84°N, zones 33 and 35 are widened to 12° to accommodate
> Svalbard. To compensate for these 12° wide zones, zones 31 and 37 are widened
> to 9° and zones 32, 34, and 36 are eliminated.
> A nice image of UTM grid including the special cases is [available on
> Wikimedia
> common|https://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg]
> (see the 31X, 33X, 35X, 37X and 32V cells). This image also covers the UPS
> cases (A, B, Y and Z cells, discussed below).
> Since the {{CommonCRS.UTM(double, double)}} method already expects latitude
> and longitude arguments, it can easily be fixed without API change. However
> it would be a slight change in its behavior. An alternative is to deprecate
> the current {{UTM(double, double)}} method and create a new
> {{universal(double, double)}} method instead. That {{universal}} method would
> handle not only the Universal Transverse Mercator (UTM) projection with the
> above-cited special cases, but also Universal Polar Stereographic (UPS)
> projections for latitudes north of 84°N or south of 80°S.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
