[ncl-talk] shapefiles problem

[Rick Brownrigg]

OK, I think I understand now. That particular shapefile, Glaciar, contains
only point features (see dump below) with just 5 features in it. I believe
the shapefile must contain polygonal regions against which to mask.


ncl 0> f=addfile("Glaciares.shp","r")
ncl 1> print(f)

Variable: f
Type: file
filename:    Glaciares
path:    Glaciares.shp
   file global attributes:
      layer_name : Glaciares
      geometry_type : point
      geom_segIndex : 0
      geom_numSegs : 1
      segs_xyzIndex : 0
      segs_numPnts : 1
   dimensions:
      geometry = 2
      segments = 2
      num_features = 5  // unlimited
      num_segments = 5
      num_points = 5
   variables:
      integer geometry ( num_features, geometry )

      integer segments ( num_segments, segments )

      double x ( num_points )

      double y ( num_points )

      integer Id ( num_features )

      string Nombre ( num_features )

ncl 2> print(f->Nombre)


Variable: Nombre (file variable)
Type: string
Total Size: 40 bytes
            5 values
Number of Dimensions: 1
Dimensions and sizes:    [num_features | 5]
Coordinates:
Number Of Attributes: 0
(0)    Glaciar Cipreses
(1)    Glaciar Palomo
(2)    Glaciar Cortaderal
(3)    Glaciar Universidad
(4)    Glaciar Cotón



On Tue, Jan 23, 2018 at 2:36 PM, Vanúcia Schumacher <
vanucia-schumacher at hotmail.com> wrote:

> Hi
>
>
> The ascii file is a mask with missing values and values in some pixels, as
> in the attached figure.
> The problem is that when I try to create another mask using the shapefile
> (to set only pixels in a specific region- smaller region of the ascii file)
> it returns only missing values.
>
>
> See printVarSummary:
>
> Variable: data
> Type: float
> Total Size: 80496 bytes
>             20124 values
> Number of Dimensions: 2
> Dimensions and sizes:    [lat | 156] x [lon | 129]
> Coordinates:
>             lat: [-34.69..-34.51]
>             lon: [-70.36..-70.28]
> Number Of Attributes: 3
>   lat2d :    <ARRAY of 20124 elements>
>   lon2d :    <ARRAY of 20124 elements>
>   _FillValue :    -9999
> (0)    min=0   max=14.9
>     ======================================================================
> (0)    Filename: "Glaciares.shp"
> (0)       Geometry type: point
> (0)       # of features: 5
> (0)       Min/max lat:    -34.69/ -34.51
> (0)       Min/max lon:    -70.36/ -70.28
> (0)       Variable names and their types:
> (0)           geometry : integer
> (0)           segments : integer
> (0)           x : double
> (0)           y : double
> (0)           Id : integer
> (0)           Nombre : string
> (0)    ===========================================================
> ===========
> (0)    min=-9999   max=-9999
>
> ------------------------------
> *De:* Rick Brownrigg <brownrig at ucar.edu>
> *Enviado:* terça-feira, 23 de janeiro de 2018 19:16:28
> *Para:* Vanúcia Schumacher
> *Cc:* ncl-talk at ucar.edu
> *Assunto:* Re: [ncl-talk] shapefiles problem
>
> Hi,
>
> Looking at your ascii file, I see its either all missing_values, or a
> handful of zeros. There's nothing to contour in a uniform scalar field, and
> NCL produced the contour plot I would expect in that case.
>
> Hope that helps...
> Rick
>
> On Tue, Jan 23, 2018 at 1:14 PM, Vanúcia Schumacher via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
> I was able to open the shapefile, but I can't plot the data_mask, because
> all the values are missing. I do not know if I'm doing something wrong
> when using the shapefile.
>
>
> I've attached the files I'm using to facilitate
>
>
> I appreciate any help
>
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>
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