CODEWITHSUNDEEP
rascii
user3737858
user3737858

Reputation: 11

R cellsize and read.asciigrid

I am new to spatial analysis and so I might have a silly question.

My problem is that I am using read.asciigrid() to read in a large ascii file.

When I try the function fails because it says object 'cellsize' not found.

My problem is that I know that there is a cellsize object in the files header, as it has the layout:

ncols        
nrows         
xllcorner     
yllcorner     
cellsize      
NODATA_value

I am not sure what the problem is, is there a way of getting around this 'missing' object or could possibly narrow down where the problem might be on my end?

Upvotes: 1

Views: 683

Answers (2)

icklegui
icklegui

Reputation: 1

I had the same problem and found that the .asc files I was trying to use had a leading space before all the header object names like:

 cellsize xxxx
 NODATA_value xxxx

instead of 

cellsize xxxx
NODATA_value xxxx

Hopefully this is your problem, as you can simply delete the spaces in the asc file using a text editor.

Upvotes: 0

Jeffrey Evans
Jeffrey Evans

Reputation: 2417

I would recommend either using readGDAL() in the rgdal package or raster() in the raster package. The readGDAL funciton will return an sp object whereas raster will return a raster object. For the most part if you are wanting to conduct raster analysis in R you want to use the raster package because it is memory safe and has many useful functions for overlay and focal analysis.

Upvotes: 1

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