read.asc(SDMTools)
read.asc()所属R语言包：SDMTools
ESRI ASCII Raster File Import And Export
ESRI ASCII栅格文件导入和导出
译者：生物统计家园网 机器人LoveR
描述----------Description----------
read.asc and read.asc.gz reads ESRI ArcInfo ASCII raster file either uncompressed or compressed using gzip. <br> <br> write.asc and write.asc.gz writes an asc object to a ESRI ArcInfo ASCII raster file. The output can be either compressed or uncompressed. <br> <br> These functions are faster methods based on the adehabitat import.asc and export.asc.<br><br> image.asc and print.asc are generic methods associated with plotting & summarizing data of class 'asc'; they were modified from adehabitat package.
read.asc和read.asc.gzESRI读取，ArcInfo的ASCII光栅文件使用gzip压缩或压缩的。参考参考write.asc和write.asc.gz写了一个递增到ESRI ArcInfo的ASCII光栅文件对象。输出可以是压缩或解压缩。参考这些功能是更快的方法的基础上在adehabitat import.asc和export.asc。<BR> <BR> image.asc和print.asc是通用的方法与绘图和总结相关的数据类ASC，他们被修改adehabitat包。
用法----------Usage----------
read.asc(file,gz=FALSE)
read.asc.gz(file)
write.asc(x,file,gz=FALSE)
write.asc.gz(x,file)
## S3 method for class 'asc'
print(x, ...)
## S3 method for class 'asc'
image(x, col = gray((240:1)/256), clfac = NULL, ...)
参数----------Arguments----------
参数：file
a character string representing the filename of the input/output file. The file extension should always be '.asc'.
一个字符表示的输入/输出文件的文件名的字符串。文件的扩展名应该总是ASC。
参数：gz
defines if the object is or should be compressed using gzip
定义，如果对象是或应使用gzip压缩
参数：x
an object of class 'asc' as defined in the adehabitat package
类“递增”的一个目的，定义在adehabitat包
参数：col
for maps of type "numeric", the colors to be used (see help(par))
图类型"numeric"，使用的颜色（见help(par)）
参数：clfac
for maps of type "factor", a character vector giving the names of colors for each level of the factor (see help(colasc))
图类型"factor"，颜色的名称字符向量给每个级别的因素（见help(colasc)）
参数：...
additional arguments to be passed to the generic function image or print
额外的参数传递的通用功能image或print
Details
详细信息----------Details----------
Implements a faster version of import.asc or export.asc from the adehabitat package. In addition, files can be read in and written to in gzip compressed format.<br><br> Generic methods of print and image were modified from adehabitat. Further details of them are found there.
实现更快的版本的import.asc或export.asc从adehabitat包。此外，文件可以被读取和写入gzip压缩的格式。，从adehabitat <BR> <BR>泛型方法进行了修改，打印和图像。进一步详情。
值----------Value----------
Returns a raster matrix of the class 'asc' defined in the adehabitat package with the following attributes:
返回类的递增定义在adehabitat包具有以下属性的栅格矩阵：
参数：xll
the x coordinate of the center of the lower left pixel of the map
左下像素的图的中心的x坐标
参数：yll
the y coordinate of the center of the lower left pixel of the map
左下像素的图的中心的y坐标
参数：cellsize
the size of a pixel on the studied map
研究的图上的像素的大小
参数：type
either 'numeric' or 'factor'
无论是“数字”或“因素”
参数：levels
if type = 'factor', the levels of the factor.
如果type =因素，因素的水平。
（作者）----------Author(s)----------
Jeremy VanDerWal <a href="mailto:jjvanderwal@gmail.com">jjvanderwal@gmail.com</a>
实例----------Examples----------
#create a simple object of class 'asc'[创建一个简单的对象类的ASC“]
tasc = as.asc(matrix(rep(x=1:10, times=1000),nr=100)); print(tasc)
#write out the raster grid file[写出来的光栅的网格文件]
write.asc(tasc,'t.raster.asc')
write.asc.gz(tasc,'t.raster.asc') #actually save file name as t.raster.asc.gz[实际保存的文件名t.raster.asc.gz]
#read in the raster grid files[在光栅格档读取]
tasc2 = read.asc('t.raster.asc')
tasc3 = read.asc.gz('t.raster.asc.gz')
#remove the temporary raster[删除临时光栅]
unlink(c('t.raster.asc','t.raster.asc.gz'))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-9-29 23:36:41
