I’ve created a bit of a mongrel cycle map http://bit.ly/9uCqn7 . It’s based on two FOI requests on cycle collisions, in January it started pulling in potholes. However now I want to tidy it up and do a separate pothole map and cycle collision map.
Does anyone know how to pull the potholes out of the map?
I tried downloading and editting the KML but simply removing the code stops displaying all the other pinpoints like this http://bit.ly/bkUVxU .
I suspect I’m approaching this the wrong way so any other suggestions for edditing the map with would be really helpful.
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How are you receiving the FOIA data?
There are command line tools which, while a bit esoteric, should be able to do what you need. There's a library called GDAL which includes something called ogr2ogr You can use ogr2ogr to convert KML to ESRI Shapefiles (.shp) and back again. You can also use it to extract a subset of points from a file using SQL-like syntax (see the documentation for the -select and -where tags)
You may also be interested in QGIS, a free mapping tool which is to ESRI's commercial ARCView software somwhat as OpenOffice is to Microsoft Office. I'm pretty novice at using QGIS, but I've been able to figure out a few things with it, and you can't beat the price. It's probably possible to use it to split a file up, but I haven't tried.
Editing the KML should work, but it's quite possible that you edited out something you shouldn't have! You might try validating your KML to verify that you haven't broken anything.
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Both of your links lead me to the middle of (i think) the Irish Sea. Presumably not a lot of bicycling going on there. Fix that link and I’ll be happy to take a peek.