[R] Error opening SHP file

[boB Rudis]

Look at the choroplethr package.

On Fri, Jan 22, 2016 at 5:31 PM, Amoy Yang <amoy_y at yahoo.com> wrote:
> Let me just make this case simple and quick to address what I need.
>
> Giving a data-file that includes tow columns: zip5 and population. How do I
> put pop (colored with different segments) by zips (with boundary) on the USA
> map with R?
>
> Amoy
>
>
> On Friday, January 22, 2016 12:45 PM, David Winsemius
> <dwinsemius at comcast.net> wrote:
>
>
>
>> On Jan 22, 2016, at 9:24 AM, Amoy Yang via R-help <r-help at r-project.org>
>> wrote:
>>
>> This is the results that addresses David's advice.
>>> library(maptools)
>>> library(maps)
>>> state.map <- readShapeSpatial("maps/st24_d00.shp")
>> Error in getinfo.shape(fn) : Error opening SHP file
>>> # David question: What does list.files('maps') return? Is there a
>>> 'st24_d00.shp' value in there?
>>> list.files('maps')
>> character(0)
>> I actually use the link below to learn how to load state/zip-data on USA
>> map.
>
> That link says:
>
> "For example (assumes you have the maryland shapefiles in the map
> subdirectory):"
>
> So it did not purport to tell you how to put shape files in that
> subdirectory. That statement assumed you understood basic OS path naming
> conventions in your unstated OS and how to move files around, which is not a
> topic for rhelp.
>
> Try working through the examples in the documents that come with the
> `sp`-package.
>
>
> --
> David.
>>
>> #
>> http://stackoverflow.com/questions/1441717/plotting-color-map-with-zip-codes-in-r-or-python
>> Plotting color map with zip codes in R or Python
>> |  |
>> |  |  |  |  |  |  |  |
>> | Plotting color map with zip codes in R or PythonI have some US
>> demographic and firmographic data. I would like to plot zipcode areas in a
>> state or a smaller region (e.g. city). Each area would be annotated by
>> col... |
>> |  |
>> | View on stackoverflow.com | Preview by Yahoo |
>> |  |
>> |  |
>>
>>    On Friday, January 22, 2016 10:03 AM, Barry Rowlingson
>> <b.rowlingson at lancaster.ac.uk> wrote:
>>
>>
>> We can duplicate the error by giving a path to a non-existent
>> shapefile, which is probably the original problem:
>>
>>> require(maptools)
>> Loading required package: maptools
>> Loading required package: sp
>> Checking rgeos availability: TRUE
>>> foo=readShapeSpatial("fnord.shp")
>> Error in getinfo.shape(fn) : Error opening SHP file
>>
>> The error message there isn't totally explicit, and might cover a
>> range of other possibilities such as a corrupted shapefile, or a
>> missing .shx component of the shapefile or whatever.
>>
>> BUT you probably shouldn't be using readShapeSpatial anyway, as it has
>> a habit of not reading the coordinate system in the .prj file. I find
>> it much easier to use `raster::shapefile` which *does* read the
>> coordinate system *and* gives a more explicit error message for a
>> missing shapefile:
>>
>>> require(raster)
>> Loading required package: raster
>>> foo=shapefile("fnord.shp")
>> Error in normalizePath(x, winslash = "/", mustWork = TRUE) :
>>  path[1]="fnord.shp": No such file or directory
>>
>> "No such file or directory"
>>
>> Barry
>>
>>
>>
>> On Fri, Jan 22, 2016 at 2:25 AM, boB Rudis <bob at rudis.net> wrote:
>>> Agreed with the others. After finding that shapefile and getting it to
>>> work you are definitely not in the proper working directory.
>>>
>>> On Thu, Jan 21, 2016 at 8:40 PM, David Winsemius <dwinsemius at comcast.net>
>>> wrote:
>>>>
>>>>> On Jan 21, 2016, at 4:39 PM, Amoy Yang via R-help
>>>>> <r-help at r-project.org> wrote:
>>>>>
>>>>> Any advice for the following errors?
>>>>> state.map <- readShapeSpatial("maps/st24_d00.shp")
>>>>> Error in getinfo.shape(fn) : Error opening SHP file
>>>>
>>>> What does list.files('maps') return? Is there a 'st24_d00.shp' value in
>>>> there?
>>>>
>>>>
>>>> --
>>>> David.
>>>>
>>>>>
>>
>>
>>
>>     [[alternative HTML version deleted]]
>       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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>
> David Winsemius
> Alameda, CA, USA
>
>