On Mon, 25 Sep 2017 13:11:32 -0700 (PDT), 'mj10777' via SpatiaLite
Users wrote:
> On Monday, 25 September 2017 21:57:04 UTC+2, Majid Hojati wrote:
>
>> Hi,
>> Can you please explain a bit about these fields in raster_coverage
>> table?They are the same for SRID=4326 but Does they face any
>> difference when we change SRID?
>
> To understand this properly you must know that the main intention was
> that RasterLite2 would be WMS capable.
> So many aspects that you see are that they are needed for a WMS
> Server.
the whole RasterLite2 has a general design closely inspired by the
WMS technical specifications, and there are several good reasons for
adopting such an approach:
- WMS is an international standard; it was initially introduced by
OGC (Open Geospatial Consortium) but it was finally adopted by
ISO itself (ISO-19128), so it's now a mandatory normative
reference for any industrial branch, not only for GIS tools.
- WMS was initially conceived for WebServices, but its conceptual
model can be easily adapted so to support an innovative approach
fully based on SQL functions more than on classic C/C++ API
- last but not least, WMS is extensively and detailed documented;
and when designing an innovative library just relying on an
already existing and well established technical specification
is surely better that "reinventing the wheel" yet another time.
If you are curious to learn more about WMS you can get for
absolutely free all the technical specification documents
from here:
http://www.opengeospatial.org/standards/wms
bye Sandro