The purpose of this tool is to provide a flexible way to show specific DNA segment overlaps in a graphic chromosome-style chart. For a detailed look at a single chromosome try my one chromosome mapper and if you want to paint a picture of which ancestors your DNA comes from, use my ancestor chromosome mapper.
The segment mapper will make a picture of the segment overlaps from up to 40 people in the CSV file you provide which is a list of your DNA match names and their overlapping segment information. Try it here: http://kittymunson.com/dna/SegmentMapper.php
A suggested usage is to download your FIA file from DNAgedcom; remove your immediate family, and then sort descending by the largest segments (genetic distance).
It can use almost any downloaded CSV from the main testing companies as is or sorted. Mac users getting errors please read the article on creating a CSV for some solutions.
There are four tracks used on each chromosome display which are assigned in the order that the people are listed. So the third person gets track 3, the fifth person goes back on track 1. When overlapping segments end up on the same track the program shows what it can; you may prefer to reorder the people in your file so that overlapping segments end up on different tracks. Or to see a specific chromosome in more detail, try the One Chromosome Mapper.
It was difficult to find more than 20 distinct colors that would work for even the color blind. So to go to 40 people I used a diagonal striped pattern when reusing the same 20 colors. Please let me know if any are difficult to tell apart.
Because the image created is html and images, you can cut and past it into an email but it is best saved via a screen shot (depress alt key and print screen) or save as a web page. The mouse-overs will not display unless you save it as a web page in which case you will also need the image files to see the stripes. Click here to download them in a zip file: stripeff99cc.zip. Put this zip file in the same folder as the saved webpage and then remove the stripeff99cc from the end of the folder name when extracting the images.
The Segment Mapper requires the column headings and contents as listed below, case sensitive, in any order, in your CSV spreadsheet
Current List of Required Columns in your CSV file for this Tool
|Column name||Alternate Name||Must Contain this Data|
|track||NOT YET IMPLEMENTED -This column is optional, select which track the segment appears on. It would need to be added by you to any CSV downloaded from 23andme or Family Tree DNA or DNAgedcom|
or any column name you specify
|This is the name to use in the chromosome map picture, you can tell the program to use a different column name for this.|
|Chr||Chromosome||Chromosome number 1-22 or X|
|The starting number for the segment location used by 23andme and Family Tree DNA, in the 23andme ancestry these numbers are divided by 100,000 so check the box for decimal if you are using that style of number.|
|The ending number for the segment (see above comment).|
|cMs||Genetic DistancecentiMorgans (cMs)SegmentLengthInCentiMorgans||The number of centimorgans in the segment, used for display purposes only. Since this is for display only you can put anything in this column for example I sometimes put a note then a dash and the cMs|
|Programming is how I make my living so a small donation of $5 or $10 via Paypal would be most appreciated, if you find this tool useful.|