我已经在 GIS stack exchange 上发布了这个问题，但没有看到太多流量。
我是一名 GIS 用户，多年来一直使用 R 进行统计，我很高兴看到许多新的 GIS 功能正在发布（光栅、shapefile、rgdal 等）。
我已经在 R 中完成了很多数据库和表操作，因此能够从 shapefile 添加和删除属性是一个强大的潜力。
我希望我只是错过了那里的东西，但我似乎找不到从 shapefile 属性表中添加或删除属性的好方法。
Overflow 的任何人都可以回复我的 GIS 帖子吗？或者我可以被告知如何将我的列表属性表放入数据框并返回以替换当前的属性表？
编辑进度
自从我的原始帖子以来取得了一些进展：
这是在弄清楚如何获取我的属性表 appart (.dbf)，添加东西，现在我正试图将它放回原处以替换原始 dbf。
>libary(raster); library(rgdal); library(shapefiles)
>shp<-shapefile(Shape) # D.C. area airport polygons
>summary(shp) #Shapefile properties
Object of class SpatialPointsDataFrame
Coordinates:
min max
coords.x1 281314.2 337904.7
coords.x2 4288867.0 4313507.0
Is projected: TRUE
proj4string :
[+proj=utm +zone=18 +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0]
Number of points: 4
Data attributes:
ObjectID LOCID NAME FIELD STATE STATE_FIPS ACAIS TOT_ENP TYPE
Min. :134.0 Length:4 Length:4 Length:4 Length:4 Length:4 Length:4 Min. : 271 Length:4
1st Qu.:242.8 Class :character Class :character Class :character Class :character Class :character Class :character 1st Qu.: 3876 Class :character
Median :339.0 Mode :character Mode :character Mode :character Mode :character Mode :character Mode :character Median :3409113 Mode :character
Mean :310.0 Mean :3717251
3rd Qu.:406.2 3rd Qu.:7122488
Max. :428.0
>shp.AT<-read.dbf(gsub(".shp", ".dbf", Shape), header=TRUE) #Read in the attribute table from the .dbf
> shp.AT # First object in the dbf looks like an attribute table!
$dbf
ObjectID LOCID NAME FIELD STATE STATE_FIPS ACAIS TOT_ENP TYPE
1 134 ADW Andrews AFB <NA> Maryland 24 Y 5078 Military
2 279 DCA Washington National <NA> Virginia 51 Y 6813148 <NA>
3 399 HEF Manassas Regional Harry P Davis Field Virginia 51 Y 271 Regional
4 428 IAD Washington Dulles International <NA> Virginia 51 Y 8050506 International
$header
$header$file.version
[1] 3
$header$file.year
[1] 113
$header$file.month
[1] 4
$header$file.day
[1] 12
$header$num.records
[1] 4
$header$header.length
[1] 321
$header$record.length
[1] 148
$header$fields
NAME TYPE LENGTH DECIMAL
1 ObjectID N 10 0
2 LOCID C 5 0
3 NAME C 45 0
4 FIELD C 30 0
5 STATE C 24 0
6 STATE_FIPS C 2 0
7 ACAIS C 1 0
8 TOT_ENP N 11 0
9 TYPE C 20 0
>shp.tab<-as.data.frame(shp.AT[1]) # Grab the first object of the .dbf as a data.frame
> shp.tab # First list object
dbf.ObjectID dbf.LOCID dbf.NAME dbf.FIELD dbf.STATE dbf.STATE_FIPS dbf.ACAIS dbf.TOT_ENP dbf.TYPE
1 134 ADW Andrews AFB <NA> Maryland 24 Y 5078 Military
2 279 DCA Washington National <NA> Virginia 51 Y 6813148 <NA>
3 399 HEF Manassas Regional Harry P Davis Field Virginia 51 Y 271 Regional
4 428 IAD Washington Dulles International <NA> Virginia 51 Y 8050506 International
> shp.tab$NewAT<-1:nrow(shp.tab) # Add my new attribute
> shp.tab # Added my new attribute, now to get this back into my shapefile
dbf.ObjectID dbf.LOCID dbf.NAME dbf.FIELD dbf.STATE dbf.STATE_FIPS dbf.ACAIS dbf.TOT_ENP dbf.TYPE NewAT
1 134 ADW Andrews AFB <NA> Maryland 24 Y 5078 Military 1
2 279 DCA Washington National <NA> Virginia 51 Y 6813148 <NA> 2
3 399 HEF Manassas Regional Harry P Davis Field Virginia 51 Y 271 Regional 3
4 428 IAD Washington Dulles International <NA> Virginia 51 Y 8050506 International 4
>write.dbf(shp.tab, gsub(".shp", ".dbf", Shape)) # Knew this wouldn't work, but demonstrate attempt to write this object as .dbf.
ERROR:
invalid subscript type 'list'
> shp.AT[1]<-shp.tab # Try replacing the old Object[1] with my new table containing the new attribute.
> shp.AT # The table portion fo the shp.AT is gone. No attributes.
$dbf
[1] 134 279 399 428
$header
$header$file.version
[1] 3
$header$file.year
[1] 113
$header$file.month
[1] 4
$header$file.day
[1] 12
$header$num.records
[1] 4
>write.dbf(shp.AT, gsub(".shp", ".dbf", Shape)) # If I go ahead and overwrite anyway...
我的属性不见了，取而代之的是一个包含单个字段“数据框”的属性表。我递归脚本以再次读取属性表。
> shp.tab
dataframe
1 134
2 279
3 399
4 428
所以，我想我很接近了。谁能帮我把它恢复到 shapefile 属性表中？或者，有没有更好的方法？
谢谢