STC-1.33 Erratum 2:Author: DM WG Date last changed: 2018-11-18 | ||||||||
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< < | Date accepted: | |||||||
> > | Date accepted:2019-04-16 | |||||||
RationaleThis erratum is to correct an error reported at the IVOA interop in Victoria, BC: May 2018
Section 4.5.1.4 (pg 30-31: Region.Polygon) states:"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A
The incorrect text is shown in bold text: This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be. The correct text is: "if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A Erratum ContentOriginal Wording
Impact Assessment
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STC-1.33 Erratum 2:Author: DM WG Date last changed: 2018-11-18 Date accepted:RationaleThis erratum is to correct an error reported at the IVOA interop in Victoria, BC: May 2018 | ||||||||
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> > | Section 4.5.1.4 (pg 30-31: Region.Polygon) states:"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A The incorrect text is shown in bold text: This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be. The correct text is: "if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A | |||||||
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Section 4.5.1.4 (pg 30-31: Region.Polygon) states:"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A The incorrect text is shown in bold text: This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be. The correct text is: "if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A | |||||||
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Erratum ContentOriginal Wording
Impact Assessment
Notes<--
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< < | STC-1.33 Erratum 2: | |||||||
> > | STC-1.33 Erratum 2: | |||||||
Author: DM WG Date last changed: 2018-11-18 Date accepted: | ||||||||
Changed: | ||||||||
< < | Rationale | |||||||
> > | Rationale | |||||||
This erratum is to correct an error reported at the IVOA interop in Victoria, BC: May 2018 | ||||||||
Changed: | ||||||||
< < | ||||||||
> > | ||||||||
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< < | Erratum Content | |||||||
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< < | Section 4.5.1.4 (pg 30-31: Region.Polygon) states: | |||||||
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< < | "The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A . " | |||||||
> > | Section 4.5.1.4 (pg 30-31: Region.Polygon) states:"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A The incorrect text is shown in bold text: This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be. The correct text is: "if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A | |||||||
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< < | The incorrect text is shown in bold text: | |||||||
> > | Erratum Content | |||||||
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> > | Original Wording
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Changed: | ||||||||
< < | This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be. The correct text is: | |||||||
> > | New Wording
Impact Assessment
Notes | |||||||
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< < |
"if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A "
Impact AssessmentNotes | |||||||
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STC-1.33 Erratum 2:Author: DM WG Date last changed: 2018-11-18 Date accepted:RationaleThis erratum is to correct an error reported at the IVOA interop in Victoria, BC: May 2018Erratum Content
Section 4.5.1.4 (pg 30-31: Region.Polygon) states:
"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A . "
The incorrect text is shown in bold text:
This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be.
The correct text is:
"if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A "
Impact AssessmentNotes<--
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