i tried to use the java polygon class but it is only for integers, is there a way to draw the map with polygon class and float coordinates?

You can convert a float to an integer with

float x = 3.78;

int y = round(x);

y now has the value 4

thnx for the reply.
i did it, it works but i get the same result.

i guess it is just bad data...

The data is not bad but when you draw a filled shape with
beginShape()
vertex(...);
vertex(...);
vertex(...);
vertex(...);
endShape();

the shape MUST be convex -

A closed shape is convex if

Definition 1
for ANY two points that are inside the shape you can join them with a single straight line that does not cross the shapes boundary.
Definition 2
for ANY two points that are outside the shape you can join them with a single straight line that does not cross the shapes boundary more than twice.


Try playing with this applet 

I am not aware of any country that has a convex shape -river mouthes and  bays are concave!.

I suggest that rather than use points use lines betwee adjacent points at least you will get a solid boundary.

quark
actually i did not know that the vertex shaped need to be convex :) thanks

i am having a bit of an issue with your suggestion.

suppose that i want to draw lines with the loaded csv file. what am i thinking is that if i want to do this, i need first to calculate the distances between all possible points and then draw them according to their distance, starting from min distance.
right?

can you give me a hint in how am i going to do that?

my initial thought is that if i want to draw lines between points (not  adjacent ones) i need to do something like this

1. for (int i=0; i<data.length; i++){
2. lines(csv[i][0],csv[i][1],csv[i+1][0],csv[i+1][1]);
3. }

i try this , but i get a blank screen...
 

I suppose you used line(), not lines()...
And have you checked the range of your coordinates? They might be outside of the display area...

philo
yes i used line :), that was a typo here (early morning)

actually i got it working like this

1. for (int i=0 ;i<data.length-1; i++){
2.   if ( sqrt(pow(csv[i][0]-csv[i+1][0],2)+pow(csv[i][1]-csv[i+1][1],2))>8){
3.   continue;
4.   }else{
5.   //point(csv[i][0],height-csv[i][1]);
6.   strokeWeight(1);
7.   line(csv[i][0],csv[i][1],csv[i+1][0],csv[i+1][1]);
8. }
9. //println(sqrt(pow(csv[i][0]-csv[i+1][0],2)+pow(csv[i][1]-csv[i+1][1],2)));
10. }

data.length-1 =36905-1=36904 to get  exactly 18452 points. with 36905 it didn t throw an array out of bounds

i removed the big lines that messed everything up by calculating the distance .Although, i put 8 by random it works fine. i will try to make it more accurate later..somehow :)