[R-sig-Geo] Extract VIIRS data in R

[Washington Correia Filho]

Dear Millu,

The data they use is not with the CRS set, so the displayed result is showing the grid points (extent: 0.5, 4064.5, 0.5, 3232.5). Then you should consult the VIIRS data guide so that you can organize your data, to which you need to know the start data for both latitude and longitude, as well as the multiplication factor and so you will have your data readjusted. I also have a similar problem to solve, if I can, I can contact you and give you the data and the scheme I used. See you soon.

Sincerely,
Washington L.F. Correia Filho
Postdoctoral Research Fellowship in Meteorology, UFAL, Brazil
Dr. in Climate Sciences, UFRN, Brazil
http://lattes.cnpq.br/7596712599262929
ORCID: https://orcid.org/0000-0002-4029-4491/

________________________________
De: R-sig-Geo <r-sig-geo-bounces using r-project.org> em nome de Miluji Sb <milujisb using gmail.com>
Enviado: ter�a-feira, 17 de mar�o de 2020 11:29
Para: R-sig-geo mailing list <r-sig-geo using r-project.org>
Assunto: [R-sig-Geo] Extract VIIRS data in R

Dear all,

Hope everyone is keeping safe.

I am trying to extract/read VIIRS nighttime lights data but the output
seems rather strange.

I have uploaded the file here
<https://drive.google.com/open?id=1zpqXJ8AlEcnk6ApRb75tfQc4-Y8AfK5h> so as
not exceed the size limit of the email.

## Code ##
library(ncdf4)
library(rgdal)

netcdf_file <- c("VNP02DNB_NRT.A2020069.1048.001.nc")
nl <- brick(netcdf_file, lvar=0, values=TRUE,
varname="observation_data/DNB_observations")

## Detail ##
class      : RasterLayer
dimensions : 3232, 4064, 13134848  (nrow, ncol, ncell)
resolution : 1, 1  (x, y)
extent     : 0.5, 4064.5, 0.5, 3232.5  (xmin, xmax, ymin, ymax)
crs        : NA
source     : C:/Users/shour/Desktop/VNP02DNB_NRT.A2020069.1048.001.nc
names      : DNB.observations.at.pixel.locations
zvar       : observation_data/DNB_observations

The spatial resolution is supposed to be 750m but this shows 1�. What am I
doing wrong? Any help will be greatly appreciated. Thank you.

Sincerely,

Millu

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