SRS = spatial reference system CRS = coordinate reference system, which is a specialisation of SRS
In a CRS, a location is identified using one or more numbers (the coordinates). An SRS can include more generic types of identifiers (I think I was once told that a postcode is an SRS but not a CRS). Because the spatial data we work with is mostly referenced against a CRS, which is a type of SRS, it is common to use the terms CRS and SRS interchangeably. On 11/05/11 12:37, lee-verizon wrote: > Oh, and what is "srs" (or did you mean crs?). > > Thanks, > > Lee > > On 5/10/2011 9:36 PM, lee-verizon wrote: >> Hm, again I'm not sure I understand. But this time it's mostly because >> I'm such a novice on GIS topics. I thought that a feature could consist >> of any arbitrary attributes, not just coordinate info. Your idea would >> handle the coordinate-related columns, but what about the rest? (And >> sorry if I'm using the -devel list for -user type questions). >> >> Lee >> >> On 5/10/2011 6:53 PM, Jody Garnett wrote: >>>> Which reminds me of another question: These CSV classes we're writing >>>> are not generic, cannot handle 'any' kind of feature. Rather they are >>>> sort of hard-wired to this simple LAT/LON/CITY/NUMBER feature. >>>> Right? Is the (longer-term) intent to make them more generic? >>> I think that would be a good idea; we could make a connection >>> parameter allowing people to indicate the following... >>> ( I am just making this up so if it is a bad idea let me know): >>> >>> - x: String (optional); name of column to treat as a point "x" value; >>> the column will not be returned as part of the feature type >>> attributes. Default value will recognise common names: lon, longitude, x >>> - y: String (optional); name of column to treat as point "y" value; >>> the column will not be returned as part of the feature type. Default >>> value will recognise common names: lat, latitude, y >>> - srs: String (optional); srsName to use; default value is >>> DefaultGeographic.WGS84 >>> - geometry: String; name of geometry attribute (using x& y above); if >>> the name identifies an existing column the values will be parsed as WKT >>> >>> I think that would make it general purpose? >> ------------------------------------------------------------------------------ >> Achieve unprecedented app performance and reliability >> What every C/C++ and Fortran developer should know. >> Learn how Intel has extended the reach of its next-generation tools >> to help boost performance applications - inlcuding clusters. >> http://p.sf.net/sfu/intel-dev2devmay >> _______________________________________________ >> Geotools-devel mailing list >> Geotools-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/geotools-devel >> > > > ------------------------------------------------------------------------------ > Achieve unprecedented app performance and reliability > What every C/C++ and Fortran developer should know. > Learn how Intel has extended the reach of its next-generation tools > to help boost performance applications - inlcuding clusters. > http://p.sf.net/sfu/intel-dev2devmay > _______________________________________________ > Geotools-devel mailing list > Geotools-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel > -- Ben Caradoc-Davies <ben.caradoc-dav...@csiro.au> Software Engineering Team Leader CSIRO Earth Science and Resource Engineering Australian Resources Research Centre ------------------------------------------------------------------------------ Achieve unprecedented app performance and reliability What every C/C++ and Fortran developer should know. Learn how Intel has extended the reach of its next-generation tools to help boost performance applications - inlcuding clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
