search

Pakillo / rSDM

Species Distribution Modelling in R
https://pakillo.github.io/rSDM/
7 stars 1 forks source link

Error in points2nearestcell #2

Closed raianu191 closed 4 years ago

raianu191 commented 4 years ago

I wanted to move the coordinates to the nearest non-NA raster value and using points2nearestcell I am getting this error: Error in class::knn1(coord.ras, coord.miss, cell.id) : 'train' and 'class' have different lengths In addition: Warning message: In seq_len(coord.ras) :

Apart from this error I have two other questions:

I am doing the SDM of an aquatic species and the rasters have been clipped from rivernetwork shapefile. The raster has a 1km*1km resolution. However, if I use a basin shapefile I get the message of "All points fall within a raster cell" which is true. Hence, (Question 1) does the raster file has something to do about this error? Also for the locs I have used the SpatialPoints function so that the CRS of both the raster and vector are same. The original location file has a longitude and latitude information.

(Question 2) Finally is moving the location a valid solution? The error of my points not falling in the raster cells would have arose because either the river network delineation was faulty at times or the coordinates were taken from river banks. Any help would be highly appreciated.

Pakillo commented 4 years ago

Hi @raianu191

Thanks for reporting. It should be fixed now. Please try reinstalling the package and let me know if there are further problems.

I think the decision if it's wise to move the points must be up to you. In some cases small GPS errors make the point fall outside the raster. Other times it may be wiser to just delete those points as unreliable.

Hope this helps