[mapserver-users] Displaying a point given its latitude andlongitude

[Emerson, Gabe]

I'm not sure about mapscript methods, but the older html method works
for me.  I would think you could use mapscript to insert inline features
using something like $layer->set('values');  

 

 

I use a dummy layer which sets up the appearance of the point, and then
add features to the layer as needed via a form variable.  Once I have a
lat/lon pair (I'm getting them from a geocoding API), I set a form
variable representing my dummy layer with the values I want inserted
into that layer.

 

These docs were useful when I set this up:

http://mapserver.gis.umn.edu/docs/reference/cgi/controls

(scroll down to "Changing map file parameters via a form or a URL")

 

http://mapserver.gis.umn.edu/docs/reference/vector_data/inline

 

 

Here's what my dummy layer looks like:

 

LAYER

                                NAME "as"   #Small scale (zoomed out)

                                STATUS off #layer must be specified ON
or DEFAULT in URL for it to be drawn

                                TYPE point

                                UNITS dd

                                PROJECTION

                                                "init=epsg:4326"

                                END

                                #Features get inserted here, specified
in URL

                                CLASS

                                                NAME "Search Result"

                                                LABEL #Label text gets
inserted via URL

                                                                FONT
"futura"

                                                                TYPE
TRUETYPE

                                                                POSITION
lc

                                                                SIZE 12

                                                                WRAP "%"
#newline when % encountered in string

                                                                BUFFER 1

                                                                COLOR 0
0 0

 
BACKGROUNDCOLOR 255 255 255

 
BACKGROUNDSHADOWCOLOR 204 204 204

 
BACKGROUNDSHADOWSIZE 3 3

                                                                FORCE
TRUE

                                                END

                                                STYLE

                                                                SYMBOL
"house"             

                                                                COLOR
255 0 0

                                                                SIZE 15

                                                END

                                END

                END

 

Here's the on-the-fly feature point creation using Javascript (in the
map template):

 document.mapserv[0].value="FEATURE POINTS "+Ylon+" "+Ylat+" END TEXT
'"+Yaddr+"%"+Ycity+", "+Ystate+" "+Yzip+"' END"; //Get lat long into
layer    

document.mapserv[1].value="STATUS default"; //Turn on dummy layer in
mapfile.

 

I have two form variables named map_layer[as], which mapserver
interprets as representing the mapfile layer "as". When you submit the
form,  the value of map_layer[as] in the URL gets set to the appropriate
part of the "as" layer in the mapfile. Two copies of this variable are
needed since I need to change both the FEATURE POINTS and the STATUS of
the layer (to turn it on and off as needed). 

 

 Here's the mapserv[0] and mapserv[1] variables that the javascript is
editing:

<input type="hidden" name="map_layer&#91as&#93" value="[inlinelayer]">

<input type="hidden" name="map_layer&#91as&#93" value="[layerstatus]"> 

 

The default variables inlinelayer and layerstatus let me maintain my
points from state to state until cleared by a user control.

 

 

 

 

-Gabe

 

 

From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of ramya
srinivasan
Sent: Wednesday, August 20, 2008 5:09 AM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] Displaying a point given its latitude
andlongitude

 

Hello,

 How to display a point in the map given its latitude and longitude.R
there any methods under php/mapscript to do this?

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