Rendering temperature on google maps

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Hi there...

I have a number of data points in the form of (latitude,longitude,temperature). I am required to render the temperature on a map.

The final result should be similar to the the map here http://peseta.jrc.ec.europa.eu/peseta1_ClimateModel.html[^]

I used google heat maps for this, and was able to render the data points successfully. The problem however is that the readings are far apart, so each reading appear as a disconnected circle. I could increase the radius of the rendered data points to solve this.

My question is: Is google heat map used to render the temperature correctly? or should I use another api?

Any advice is highly appreciated.

Posted 3-Nov-13 20:45pm

mkaatr2

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mkaatr2 · Accepted Answer · 2013-11-05T04:52:00

I found out how to calculate the interpolated temperature data points that need to be rendered. The code is very simple really:

VB

Public Structure PointXYZ
    Public X As Single
    Public Y As Single
    Public Z As Single
End Structure

Public Function GetZInterpolationForPoint(ByVal X As Single, ByVal Y As Single, ByVal KnownPoints() As PointXYZ, ByVal P As Single) As PointXYZ
    Dim I As Integer

    Dim Sum1 As Single = 0
    Dim Sum2 As Single = 0
    For I = 0 To KnownPoints.Length - 1
        Dim DX As Single = (KnownPoints(I).X - X) ^ 2
        Dim DY As Single = (KnownPoints(I).Y - Y) ^ 2
        Dim LP As Single = (DX + DY) ^ (0.5)
        Sum1 = Sum1 + KnownPoints(I).Z / (LP ^ P)
        Sum2 = Sum2 + (1.0 / (LP ^ P))
    Next

    Dim PT As New PointXYZ
    PT.X = X
    PT.Y = Y
    PT.Z = Sum1 / Sum2
    Return PT
End Function

You just call the function passing an array of PointXYZ which holds the known data points, the desired x,y value, and you get in return a PointXYZ structure containing the interpolated value.

Google heatmap however did not render the interpolated values correctly. I am wondering if there is a way to render these existing data points on top of google maps.