[mapserver-users] Circles around points in miles
Ian Walberg
ian.walberg at airborne.aero
Mon Jun 11 20:26:48 PDT 2012
Ok, so the MAP level units need to be set to the unit of the projection.
That means in this case they need to be meters.
Works now.
Ian
-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Ian Walberg
Sent: Monday, June 11, 2012 8:02 PM
To: Arnd Wippermann
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Circles around points in miles
Arnd,
Maybe.
We had assumed that the UNITS for the layer would stay the same for different projections.
Thanks
Ian
Below is a map file with the settings we are using.
The Extent and projection are commented out for the test.
With the projection set to "init=epsg:4326" the circles appear the size we expect.
With projection set to "proj=orth" and the extent changed to EXTENT
-200000 -200000 200000 200000 all the other data (removed form this map file for simplicity) appears ok and the circles disappear.
MAP
NAME 'Simple'
STATUS ON
SIZE 1280 768
EXTENT -121 34 -115 41
# EXTENT -200000 -200000 200000 200000
UNITS DD
SHAPEPATH "shp"
IMAGECOLOR 120 120 120
SYMBOL
NAME 'circle2'
TYPE ELLIPSE
POINTS 1 1 END
FILLED FALSE
END
LAYER
DEBUG 5
NAME range_circles
TYPE point
STATUS DEFAULT
UNITS miles
SIZEUNITS miles
FEATURE
POINTS
-118 38
END
END
CLASS
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 50
COLOR 255 0 0
END
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 100
COLOR 255 0 0
END
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 150
COLOR 255 0 0
END
END
PROJECTION
"proj=latlong"
"ellps=WGS84"
"datum=WGS84"
END
END
PROJECTION
"init=epsg:4326"
# "proj=ortho"
"lat_0=38.0"
"lon_0=-118"
"ellps=WGS84"
END
END
-----Original Message-----
From: Arnd Wippermann [mailto:arnd.wippermann at web.de]
Sent: Monday, June 11, 2012 1:36 PM
To: Ian Walberg
Cc: mapserver-users at lists.osgeo.org
Subject: AW: [mapserver-users] Circles around points in miles
Hello,
Most likely the radius of your circles is to small for the extent you choose
Arnd
-----Ursprüngliche Nachricht-----
Von: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] Im Auftrag von Ian Walberg
Gesendet: Montag, 11. Juni 2012 18:37
An: Lime, Steve D (DNR); mapserver-users at lists.osgeo.org
Betreff: Re: [mapserver-users] Circles around points in miles
Steve,
Below is a map file with the settings we are using.
The Extent and projection are commented out for the test.
With the projection set to "init=epsg:4326" the circles appear the size we expect.
With projection set to "proj=orth" and the extent changed to EXTENT -200000
-200000 200000 200000 all the other data (removed form this map file for
simplicity) appears ok and the circles disappear.
Thanks
Ian
MAP
NAME 'Simple'
STATUS ON
SIZE 1280 768
EXTENT -121 34 -115 41
# EXTENT -200000 -200000 200000 200000
UNITS DD
SHAPEPATH "shp"
IMAGECOLOR 120 120 120
SYMBOL
NAME 'circle2'
TYPE ELLIPSE
POINTS 1 1 END
FILLED FALSE
END
LAYER
DEBUG 5
NAME range_circles
TYPE point
STATUS DEFAULT
UNITS miles
SIZEUNITS miles
FEATURE
POINTS
-118 38
END
END
CLASS
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 50
COLOR 255 0 0
END
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 100
COLOR 255 0 0
END
STYLE
MAXWIDTH 1
SYMBOL 'circle2'
SIZE 150
COLOR 255 0 0
END
END
PROJECTION
"proj=latlong"
"ellps=WGS84"
"datum=WGS84"
END
END
PROJECTION
"init=epsg:4326"
# "proj=ortho"
"lat_0=38.0"
"lon_0=-118"
"ellps=WGS84"
END
END
-----Original Message-----
From: Lime, Steve D (DNR) [mailto:Steve.Lime at state.mn.us]
Sent: Monday, June 11, 2012 7:45 AM
To: Ian Walberg; mapserver-users at lists.osgeo.org
Subject: RE: [mapserver-users] RE: Circles around points in miles
What are the UNITs set to with "proj=ortho"?
-----Original Message-----
From: Ian Walberg [mailto:ian.walberg at airborne.aero]
Sent: Friday, June 08, 2012 7:19 PM
To: mapserver-users at lists.osgeo.org
Cc: Lime, Steve D (DNR)
Subject: RE: [mapserver-users] RE: Circles around points in miles
This question from earlier in the year has finally got to the top of our to do list.
The issue is how to draw a circle at a given size (ideally in miles) when using "proj=ortho".
Everything works well when using "proj=latlong" and SIZEUNITS miles.
Is this the expected behaviour and we do not understand something or is this a problem?
Many thanks
Ian
-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Ian Walberg
Sent: Thursday, February 16, 2012 1:57 PM
To: mapserver-users at lists.osgeo.org
Cc: Lime, Steve D (DNR)
Subject: RE: [mapserver-users] RE: Circles around points in miles
This does not work in all cases as we hoped, or we may not understand how to use the overall ma projection correctly.
All the layers have the projection set to "proj=latlong,ellps=WGS84".
However if we set the overall map projection from this to "proj=ortho"
the layer with the sizeunits set disappears.
Is this an issue related to the projection or that the map units are now different.
If we remove the sizeunits from the layer with the circles they reappear but of course are not the correct size (in miles).
Many thanks
Ian
-----Original Message-----
From: Ian Walberg
Sent: Wednesday, February 15, 2012 11:40 AM
To: Stephen Woodbridge; mapserver-users at lists.osgeo.org
Subject: RE: [mapserver-users] RE: Circles around points in miles
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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