Fundamental spatial coordinate systems. WGS84 vs RA/DEC
Hi,
I have some sort of fundamental question about the Oracle Spatial feature and its coordinate model. As far as I am aware of, Oracle use WGS84 coordinate reference but I am pretty much interested on RA/DEC. RA/DEC are used for astronomy as a reference system and my question is whether anybody knows how to map RA/DEC into WGS84 and in the other way around. I know that LATITUDE=DEC but LONGITUDE !=RA.
I know that we can assume that a negative longitude in WGS84 is west of Greenwich than we'd get LONGITUDE = RA*15 and LATITUDE = DEC. The celestial longitude RA=0 through the vernal equinox would then be projected on the meridian of Greenwich. The problem is that I don't know about the accuracy of this assumptions.
I post this query here because I am using GeoSPARQL and Oracle semantic database to try to model part of the Sky. Maybe I should post the query on the Spatial forum, but please let me know!
Cheers
Hi,
I would suggest that you post this question on the spatial forum.
Thanks,
Matt
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Select data with SDO_RELATE in lat long coordinate system(8307) in 10gR2
Hi all,
I have problem with selecting data from table.
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Regards,
ZdenekZdenek,
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Hi guys,
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anyone could help?
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ORA-13487: SRID not found for source coordinate system metadata
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/* Copyright (c) Oracle Corporation 1996. All Rights Reserved. */
NAME
D2FCRD.H -- Dev2K Forms API CooRDinate system declarations
DESCRIPTION
Contains the public declarations for the Forms API CooRDinate system
PUBLIC FUNCTIONS
d2fcrdcr_Create - Cover for d2fobcr_Create
d2fcrdde_Destroy - Cover for d2fobde_Destroy
d2fcrddu_Duplicate - Cover for d2fobdu_Duplicate
d2fcrdex_Extract -
d2fcrdap_Apply -
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d2fobcs_CharSize
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extern "C"
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ORA_RETTYPE(d2fstatus) d2fcrdde_Destroy( d2fctx *pd2fctx, d2fcrd *pd2fcrd );
ORA_RETTYPE(d2fstatus) d2fcrddu_Duplicate( d2fctx *pd2fctx,
d2fcrd *pd2fcrd_src,
d2fcrd **ppd2fcrd_dst );
ORA_RETTYPE(d2fstatus) d2fcrdex_Extract( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fcrdap_Apply( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fcrdgo_GetObjProp( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fcrdsb_SetBoolProp( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fcrdsn_SetNumProp( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fcrdhp_HasProp( d2fctx *pd2fctx, d2fcrd *pd2fcrd,
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ORA_RETTYPE(d2fstatus) d2fobss_StringSize( d2fctx *pd2fctx,
text *str,
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number width,
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#define d2fcrdg_coord_sys(ctx,obj,val) \
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#define d2fcrdg_dflt_fnt_scaling(ctx,obj,val) \
d2fcrdgb_GetBoolProp(ctx,obj,D2FP_DFLT_FNT_SCALING,val)
#define d2fcrdg_real_unit(ctx,obj,val) \
d2fcrdgn_GetNumProp(ctx,obj,D2FP_REAL_UNIT,val)
#define d2fcrds_char_cell_hgt(ctx,obj,val) \
d2fcrdsn_SetNumProp(ctx,obj,D2FP_CHAR_CELL_HGT,val)
#define d2fcrds_char_cell_wid(ctx,obj,val) \
d2fcrdsn_SetNumProp(ctx,obj,D2FP_CHAR_CELL_WID,val)
#define d2fcrds_coord_sys(ctx,obj,val) \
d2fcrdsn_SetNumProp(ctx,obj,D2FP_COORD_SYS,val)
#define d2fcrds_dflt_fnt_scaling(ctx,obj,val) \
d2fcrdsb_SetBoolProp(ctx,obj,D2FP_DFLT_FNT_SCALING,val)
#define d2fcrds_real_unit(ctx,obj,val) \
d2fcrdsn_SetNumProp(ctx,obj,D2FP_REAL_UNIT,val)
/* End convenience macros */
/* C++ Support */
#ifdef __cplusplus
#endif
#endif /* D2FCRD */ -
Hello everyone,
I am new to Java 3D and was trying to create a simple 3D Coordinate system that has an x, y, and z axis. Can anyone help me or point me in the right direction regarding this issue? Appreciate the help.
Moe.http://www.cs.brown.edu/exploratories/freeSoftware/catalogs/repositoryComponents.html
has some coordinate systems available
alain -
Need ruling on screen coordinate system to use with AWTVideoSizeControl...
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Im working on a tru2way application and a nagging question keeps popping up with stack vendors on the usage of the AWTVideoSizeControl interface. I was hoping you could provide a definitive answer (note that Bill Foote is the author of the interface spec).
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Periodically, I run into a stack vendor who expects AWTVideoSize (as passed to AWTVideoSizeControl.setSize) to be expressed in video plane coordinates Ive so far been able to convince these folks that the spec requires graphics coordinates. Ive just run into an interesting situation, though, where although the vendor agrees that AWTVideoSize should be in graphics coordinates, theyre feeling that the Dimension returned from AWTVideoSizeControl.getSourceVideoSize() should be based on the video plane coordinate system. Their thinking is that while x and y are coordinates (and therefore are called out as needing to be expressed relative to the graphics screen), height and width arent.
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Thanks.You would have to check with the manufacture of your system to see if they have an app available in the Apple App store to access their system. Since you do not indicate the system name or other information, you would need to also search the app store based on the answer the manufacturer provides for you. No one here would be able to guess at what you have.
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Coordinate System of template form
Hi there,
we are currently using Headstart 3.4.2 that was adjusted to our clients requirements. One of the requirements was not to work with a real MDI look and feel, that means every Forms-Module is sized to fit exactly into the MDI Window and then maximized. The surrounding MDI window is sized to a 800x600 screen resolution and centered on the screen.
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Thanks in advance
--Thomas@MLBrown,
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Yes, this is an old book, but with the lack of any better books available - it is still a good place to start to get a basic understanding of how to design an Oracle Form for the web; not to mention it is still a good reference for using some of the more advanced features of Oracle Forms like "Basing a Block on a Procedure" or a "From Clause Query", just to name a few. These Forms features haven't changed much since they were introduced.
@jbleg,
With respects to the "Template System" referred to in the book. This was not a commercially available product, but a reference to a set of templates that Peter created. The point was to enforce the need to create standards and partially enforce them through the use of Templates. The use of Templates in you design/development process is still a very valid approach and I suggest you review Chapters 10-12 again.
Craig... B-)
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