Hi All,
I am working on a study that would require to measure the movement activity of experimental mice. For this to do, I am monitoring the mice with thermal camera, and I can get the coordinates of the "hottest pixels" from the images using R statistical software. To get the movement activity, I was advised to make a fishnet analysis using these points and find the frequencies of the point positions in the fishnet.
So, I have X-Y coordinates with no geo projection data, there is a rectangle of 40*120 pixel, where the points can distribute, and I want to find the frequency of the positions in a fishnet over this rectangle, hole size let's say 10*10 pixel large. How can I do it? TI am trying to use many spatial data manipulation libraries (sp, fieldRS, etc.), but nearly all assumes that my data are geographical and wants to have CRS info, which I have not...
Thank you for your help in advance!
No need to use packages. This can be done without much effort in base R (see attachment; please note that the fist part is used only to generate same data, the large middle part is only for making a nice picture and the relevant part are only three lines of code at the end).