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

[Ian Walberg]

Stephen,

That appears to do the trick.

Many thanks

Ian

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Stephen
Woodbridge
Sent: Wednesday, February 15, 2012 10:36 AM
To: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] RE: Circles around points in miles

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
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