Algorithm for heat map?

Posted by eshan on Stack Overflow See other posts from Stack Overflow or by eshan
Published on 2010-02-26T17:57:36Z Indexed on 2010/03/27 15:53 UTC
Read the original article Hit count: 797

Filed under:

heatmap

|

algorithm

I have a list of values each with latitude and longitude. I'm looking to create a translucent heatmap image to overlay on Google Maps. I know there are server side and flash based solutions already, but I want to build this in javascript using the canvas tag.

However, I can't seem to find a concise description of the algorithm used to turn coordinates and values into a heatmap. Can anyone provide or link to one?

Thanks.

© Stack Overflow or respective owner

Related posts about heatmap

Generating a KML heatmap from given data set of [lat, lon, density]

as seen on Stack Overflow - Search for 'Stack Overflow'
I am looking to build a static KML (Google Earth markup) file which displays a heatmap-style rendering of a few given data sets in the form of [lat, lon, density] tuples. A very straightforward data set I have is for population density. My requirements are: must be able to feed in data for a given… >>> More
[R] Select columns for heatmap in R

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi stackoverflow-pros, I need your help again :) I wrote an R script, that generates a heatmap out of a given tab-seperated txt or xls file. At the moment, I delete all columns I don't want to have in the heatmap by hand in the xls file. Now I want to automatize it, but I don't know how :( The… >>> More
ggplot2 heatmap : how to preserve the label order ?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to plot heatmap in ggplot2 using csv data following casbon's solution in http://biostar.stackexchange.com/questions/921/how-to-draw-a-csv-data-file-as-a-heatmap-using-numpy-and-matplotlib the problem is x-label try to re-sort itself. For example, if I swap label COG0002 and COG0001 … >>> More
R heatmaps - non-text labels?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am making a heatmap plot; currently the axes are labeled by index number. However, the index number corresponds to a series of 1/0s, which my group typically represents with a row of filled(1) or unfilled(0) boxes (think chessboard, though not strictly alternating colors). I'd like to use that… >>> More
Trulia Adds Commute Time Calculator to Their Neighborhood Heat Maps

as seen on How to geek - Search for 'How to geek'
Trulia–a popular real estate site well known for their neighborhood heat maps covering crime, school locations, and property values–now shows commute times in heat map form; see instantly how far away your potential new place is from where you want to work. Accessing the commute heatmap… >>> More

Related posts about algorithm

Jpeg Algorithm vs BMP Algorithm?

as seen on Super User - Search for 'Super User'
I'm just wonder, what the differences are between creating a BMP file algorithm and JPG file algorithm ? If you know the others images' format algorithm, please post them. Thanks. >>> More
word disambiguation algorithm (Lesk algorithm)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hii.. Can anybody help me to find an algorithm in Java code to find synonyms of a search word based on the context and I want to implement the algorithm with WordNet database. For example, "I am running a Java program". From the context, I want to find the synonyms for the word "running", but the… >>> More
Search algorithm (with a sort algorithm already implemented)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, Im doing a Java application and Im facing some doubts in which concerns performance. I have a PriorityQueue which guarantees me the element removed is the one with greater priority. That PriorityQueue has instances of class Event (which implements Comparable interface). Each Event is associated… >>> More
Is there any algorithm for finding LINES by PIXEL COLORS on picture?

as seen on Stack Overflow - Search for 'Stack Overflow'
So I have Image like this I want to get something like this (I hevent drawn all lines I want but I hope you can get my idea) I need algorithm for finding all straight lines on it by just reading colors of pixels. No hard math, no Haar, no Hough. Some algorithm which would be based on points… >>> More
collsion issues with quadtree [on hold]

as seen on Game Development - Search for 'Game Development'
So i implemented a Quad tree in Java for my 2D game and everything works fine except for when i run my collision detection algorithm, which checks if a object has hit another object and which side it hit.My problem is 80% of the time the collision algorithm works but sometimes the objects just go… >>> More