Message-ID: <CALrbzg3Cj6BEDmrHONrTix135mtmUEm-WmiXSj0AuJbn_8KuMA@mail.gmail.com>
Date: 2021-03-02T18:50:04Z
From: Ben Tupper
Subject: How to identify the different discrete classes from a raster of land cover data (tif).
In-Reply-To: <CABkCotTEq+8SsQadO1wrhZDSUxEzCDaXBQFefGg0ot98Jy+F6Q@mail.gmail.com>
Hi,
I'm not familiar with the dataset, but I am guessing it is related to how
the labels are encoded. If that is the case, then it is possible the stored
class labels are not literally 1-23 but are 23 labels selected from the
range of 0-255. You could do a brief check with ...
table(r[])
Cheers,
Ben
On Tue, Mar 2, 2021 at 12:15 PM Manuel Sp?nola <mspinola10 at gmail.com> wrote:
> Dear list members,
>
> I am working with a .tif file from the Copernicus Global Land Service with
> land cover data. The file has 23 discrete classes but the raster shows a
> continuous range of values (0 to 255).
>
> r =
>
> raster(W100N20_PROBAV_LC100_global_v3.0.1_2019-nrt_Discrete-Classification-map_EPSG-4326.tif)
>
> class : RasterLayer
> dimensions : 20160, 20160, 406425600 (nrow, ncol, ncell)
> resolution : 0.0009920635, 0.0009920635 (x, y)
> extent : -100, -80, 0, 20 (xmin, xmax, ymin, ymax)
> crs : +proj=longlat +datum=WGS84 +no_defs
> source :
> /Users/manuelspinola/Documents/01-Manolo/R_OVS_material/landscape_ecology/datos_copernicus/W100N20_PROBAV_LC100_global_v3.0.1_2019-nrt_Discrete-Classification-map_EPSG-4326.tif
> names :
> W100N20_PROBAV_LC100_global_v3.0.1_2019.nrt_Discrete.Classification.map_EPSG.4326
> values : 0, 255 (min, max)
>
>
>
> How can I recognize the different discrete classes included in the raster
> representing each land cover type.
>
> Manuel
>
>
> --
> *Manuel Sp?nola, Ph.D.*
> Instituto Internacional en Conservaci?n y Manejo de Vida Silvestre
> Universidad Nacional
> Apartado 1350-3000
> Heredia
> COSTA RICA
> mspinola at una.cr <mspinola at una.ac.cr>
> mspinola10 at gmail.com
> Tel?fono: (506) 8706 - 4662
> Personal website: Lobito de r?o <
> https://sites.google.com/site/lobitoderio/>
> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>
>
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>
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--
Ben Tupper
Bigelow Laboratory for Ocean Science
East Boothbay, Maine
http://www.bigelow.org/
https://eco.bigelow.org
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