[Chameleon] Drawing points with latitude and longitude - Please help me

Ines mleonsoft at yahoo.com.ar
Thu Nov 2 10:25:43 EST 2006

Julien, thank you for your help again. I created the drop down list and I
saw the Gmap example. But I´m not sure if I´m in the correct way. Now I
explain exactly what I have to do.

I have this information:

Species(Description)	Latitude1	longitude1	Latitude2	longitude2	Latitude3

fish species           xxxxxx	       xxxxxxx	xxxxxxx	 xxxxxxx	  xxxxxx
bird species           xxxxxxx	 xxxxxxx	xxxxxxx	xxxxxxx	  xxxxxx	 xxxxxxxx

I have to show in a map the places where is every specie. Every specie are
located in several places of the map. Like "Parks" in the GMap example. In
the Gmap example, the parks are in several points of the map drawn with
green color. I have to make the same. But, every specie have several
latitudes and longitudes for indicate every point of the map where I have to
draw every point (circle or another image) where is located the specie.

My idea is to place every specie (description) in a drop down list, and when
I select one specie, draw in the map all the points where is located that
specie. For example with a circle or another image.

I think It could be:

1) Select the specie of the drop down list
2) Read all latitudes and longitudes of that specie
3) Take a layer where I will show that points (circles or another image)
4) Show in that layer all the points (latitudes and longitudes) where is
located that specie.

So, I maked a new widget with the tutorial of chameleon, I have a layer
ready to work in it (I duplicated a layer in the file .map for work in it
without problems) and I maked a drop down list with your help in the new
widget where I show the species (descriptions).

But I don't know how to read the latitudes and longitudes and from where.
And how to draw the circles or another images to put in the map (or layer)
that corresponds to every latitude and longitude of a specific specie (the
specie I selected)

Again thank you very much!


-----Mensaje original-----
De: Julien-Samuel Lacroix [mailto:jlacroix at mapgears.com]
Enviado el: miércoles, 01 de noviembre de 2006 13:00
Para: Ines
CC: chameleon at lists.maptools.org
Asunto: [Bulk] Re: [Chameleon] Add layers drawing points (circles) with
latitude and longitude

I'm not sure I understand everything you need so I'll give you some
pointers and hope they are helpful. If not, do not hesitate to post some
more details. BTW here's the mapscript documentation:

You can also look at the GMap demo which I think may be included in
MS4W. If not, you can find it here:
under PHP/MapScript Sample Application

1) If you want to display a drop down listsimply add in your
DrawPublish() function the following:
$szReturn = "<select
return $szReturn;

2) The following code is not tested and need to be adapted to your needs
and application. In the ParseURL():
     $oMap = $this->moMapObject->oMap;
     $oLayer = $oMap->getLayerByName('myLayer');
     $oLayer->set('status', MS_ON);
     $oClass = $olayer->getClass(0);

I hope it gives you an idea of how to do things.


Ines wrote:
> Normand, thank you very very much for your help. I created successfully my
> new widget!!! I'm very happy really.
> Now, I need to add descriptions in the widget to display as a list, drop
> down list or something to continue with my work. I'm making the steps that
> Julien tell me to do it.
> I have my widget and I have the layer ready. Now I need to know how to do
> this:
> 1) display the descriptions in the widgets
> 2) set the EXPRESSION and status of the layer in the
> mapfile with the description column value
> In this mail (below) I explain what I have to do.
> Thank you very much again
> Ines
> -----Mensaje original-----
> De: Julien-Samuel Lacroix [mailto:jlacroix at mapgears.com]
> Enviado el: viernes, 20 de octubre de 2006 11:25
> Para: Ines
> Asunto: [Bulk] Re: [Chameleon] Add layers drawing points with latitude
> and longitude
> Hello,
> There's no widget that do exactly that I think, but creating a new one
> would be easy. I suggest you add a layer in your mapfile to display this
> information. You can create widget that will display the descriptions
> and once done will set the EXPRESSION and status of the layer in the
> mapfile with the description column value.
> Check this link to create your own widget:
> eleon+Widget
> Julien
> Ines wrote:
>>Hello, I have a database with some latitudes and longitudes and
> description
>>and I have to show that points in a layer (map).
>>For example, the columns of the database:
>>latitude		longitude	Description
>>xxxxxxxxx         xxxxxxx     bird species
>>xxxxxxxxx         xxxxxx      shark species
>>I need to make that the people can select the description in some place of
>>my aplication and the aplication show the map with a "circle" for example
>>lacated in that latitude and longitude, and then, add that image (or
> layer)
>>with that point in the main map. I saw an aplication that have a "button"
>>called "WMS layers" that make some similar with the Map Browser but I
> don't
>>know how it works.
>>Thank you very much
>>Chameleon mailing list
>>Chameleon at lists.maptools.org
> --
> Julien-Samuel Lacroix
> Mapgears
> http://www.mapgears.com/
> _______________________________________________
> Chameleon mailing list
> Chameleon at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/chameleon

Julien-Samuel Lacroix

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