[mapserver-users] RE: Circles around points in miles

[Stephen Woodbridge]

On 2/15/2012 1:23 PM, Ian Walberg wrote:
> Steve,
>
> Thanks again for the info so far.
>
> Testing this today we realise (not surprisingly) that both the size and
> width of the symbol are now in miles.
>
> Ideally we would like to set the radius of the circle in miles and the
> width in pixels.
>
> Is there any way of doing this?

Yes, add minwidth 1 and maxwidth 1 to force the width to 1 pixel.

-Steve W

> Regards
>
> Ian
>
> -----Original Message-----
> From: Lime, Steve D (DNR) [mailto:Steve.Lime at state.mn.us]
> Sent: Monday, February 13, 2012 2:57 PM
> To: Ian Walberg; mapserver-users at lists.osgeo.org
> Subject: RE: Circles around points in miles
>
> I jumped the gun on the geomtransform idea. The support is there but
> because it operates at the style level buffer distances must be given in
> pixels and there's no easy way to convert a map distance (e.g. 10 miles)
> to pixels. I really should make some runtime constants (for example,
> extent, scale and cellsize) available to expressions- then you could do
> this.
>
> Glad you picked option 2 to start.
>
> Steve
>
> -----Original Message-----
> From: Ian Walberg [mailto:ian.walberg at airborne.aero]
> Sent: Monday, February 13, 2012 4:38 PM
> To: Lime, Steve D (DNR); mapserver-users at lists.osgeo.org
> Subject: RE: Circles around points in miles
>
> Steve,
>
> Many thanks for the help and we have just tested option 2 and that
> works.
>
> We are using 6.x but are not exactly sure how to use the geomtransform
> to do this. Do you have  an example?
>
> Regards
>
> Ian
>
> -----Original Message-----
> From: Lime, Steve D (DNR) [mailto:Steve.Lime at state.mn.us]
> Sent: Monday, February 13, 2012 9:37 AM
> To: Ian Walberg; mapserver-users at lists.osgeo.org
> Subject: RE: Circles around points in miles
>
> Couple of options depending on version:
>
>    1) 6.x: buffer the points using a style geomtransform
>    2) all versions: use layer SIZEUNITS to draw a circle symbol in miles
>
> I think option 1 is more flexible but option 2 is probably faster.
>
> Steve
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Ian
> Walberg
> Sent: Saturday, February 11, 2012 10:06 PM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] Circles around points in miles
>
>
> We need to draw circles of 50 and 100 miles around a list of points.
>
> How can we do this?
>
> Thanks
>
> Ian
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>
>
>
>
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users