WMS OR WFS

[Roman83]

Hi everyone,

Just recently discovered your project, I think u guys are doing a
wonderful job. I am new to OGC standards and j2me. I have a few
questions to ask.

1. Why is the jvn mobile gis using wms instead of wfs ? Are they
advantages of wms over wfs ? If they are what are they ? At least from
the little knowlege i have. I know wfs has support for attribute data
unlike wms.

2. Are there plans to include wfs in this j2me app.

Thanks in advance
Roman

[Standards Guy]

Roman -

I am not familiar with the JVNMobile work but I am familiar with OIGC
standards. WMS allows a client (or server application) to specify an
area of interest (bounding box) and the map layers to be processed by
the server. The response to the WMS request is a map image for the AOI
and layer requested. The map image can be thought of as a geo-
registered picture. You can also control the styling of the geographic
content shown in the image using the OGC Style Layer Descriptor
standard. The SLD allows for the specification of all the styling
rules to be used by the server to generate the map image. You can also
use a DescribeFeature request to get all the attribute information for
a specified feature displayed in the map image. The response to a DF
request is an XML encoding of the attribute data.

WFS, on the other hand, allows the client (or a server) to specify a
filter, such as area of interest, attribute values, and so forth, and
request all the features in the specified layer that meet the filter
requirements to be returned. The response is a GML payload (encoding)
of all the features that met the filter criteria. This means that they
client needs to "understand" what to do with a GML payload. However,
the WFS can be cascaded from a WMS so that the results of a WFS
request/response and then processed and returned to the client using
the WMS interface (and perhaps SLD) as a map image.

Hope this helps.

Carl Reed
OGC

On Nov 29, 1:41 am, Roman83 <romanisi...@yahoo.com> wrote:
> Hi everyone,
>
> Just recently discovered your project, I think u guys are doing a
> wonderful job. I am new to OGC standards and j2me. I have a few
> questions to ask.
>

> 1. Why is the jvn mobile gis usingwmsinstead of wfs ? Are they
> advantages ofwmsover wfs ? If they are what are they ? At least from

[Bui Hong Son]

Hi all,

We use WMS for view , WFS for geoproccessing (maybe WPS in the
future).
The images from server (by WMS ) is small enough for mobile device.
GML from WFS is too big in this case and mobile should do a lot to
create the image.

@ Card Reed : I translate some your article about OGC (Standards) into
Vietnamese. You can see one of them bellow:
http://vnbhs.blogspot.com/2007/11/ogcs-wms-cookbook-gia-v-cho-vic-bn-ln.html