[GRASS-user] visualizing transit times as a map layer

Christian Kaiser Christian.Kaiser at unil.ch
Sat Jan 9 13:29:44 EST 2010

Hello James,

You can get your CSV file into GRASS using v.in.ascii. You will have points that you should convert in some way into a raster file (interpolation? may not be adequate).

You can also compute cumulative distances and times from one or several points using r.cost. It is not exactly what you are looking for, but maybe it is helpful.


Christian Kaiser

On 9 janv. 2010, at 17:01, James Kebinger wrote:

> Hello grass users - I've got a beginner level question for you. 
> I've generated a csv file containing latitude, longitude, and transit time to a location in the Boston metro area. I'd like to load this file as a map layer and visualize it as a heatmap-style visualization. 
> How do I get started with GRASS to do such a thing? Is it possible to import this type of file, or is there a step I have to do (rasterizing?) prior to starting with GRASS?
> thanks!
> -James 
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