Dear all,

 

This may seem a very obvious question but I'm suck and for the past 2h I
haven't been able of solving the problem. So for the sake of
productivity I'll ask for some help:

 

I have a SpatialPolygon Class that looks like(see bellow) in the example
below I have only 2 polygons but they will be thousands. What I'm trying
to achieve is a list with the total area of each polygon.  

 

Thanks in advance 

 

> str(res)

Formal class 'SpatialPolygons' [package "sp"] with 4 slots

  ..@ polygons   :List of 2

  .. ..$ :Formal class 'Polygons' [package "sp"] with 5 slots

  .. .. .. ..@ Polygons :List of 9

  .. .. .. .. ..$ :Formal class 'Polygon' [package "sp"] with 5 slots

  .. .. .. .. .. .. ..@ labpt  : num [1:2] 3.19 51.68

  .. .. .. .. .. .. ..@ area   : num 8.96e-05

  .. .. .. .. .. .. ..@ hole   : logi FALSE

  .. .. .. .. .. .. ..@ ringDir: int 1

  .. .. .. .. .. .. ..@ coords : num [1:5, 1:2] 3.18 3.18 3.19 3.2 3.18
...

.

.

.

 

  .. .. .. ..@ plotOrder: int [1:9] 9 8 2 3 1 4 7 5 6

  .. .. .. ..@ labpt    : num [1:2] 3.14 51.67

  .. .. .. ..@ ID       : chr "2"

  .. .. .. ..@ area     : num 0.000993

  ..@ plotOrder  : int [1:2] 2 1

  ..@ bbox       : num [1:2, 1:2] 3.09 51.66 3.26 51.73

  .. ..- attr(*, "dimnames")=List of 2

  .. .. ..$ : chr [1:2] "x" "y"

  .. .. ..$ : chr [1:2] "min" "max"

  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots

  .. .. ..@ projargs: chr NA

 

 

 

 

 

Rui Catarino

Scientific Officer 

Fishery Systems Group

Marine Scotland - Science

 

Scottish Government | 36 |B |Marine Laboratory, PO Box 101| 375,
Victoria Road | Aberdeen AB11 9DB

 

Tel:  +44 (0)1224 295572

Mob:+44 (0)7530 240666

Fax: +44 (0)1224 295511

e: r.catarino@marlab.ac.uk  

w: http://www.scotland.gov.uk/marinescotland
<http://www.scotland.gov.uk/marinescotland>     

 


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