dnpp: Ocean Net Primary Production sample data

In satin: Visualisation and Analysis of Ocean Data Derived from Satellites

Ocean Net Primary Production sample data

Description

Ocean Net Primary Production (8-day average; 9.26 km resolution) from March 30 to April 6 2013 off northwest Mexico.

Usage

data("dnpp")

Format

Formal class 'satin' [package "satin"] with 6 slots

..@ lon	: num [1:180] -119 -119 -119 -119 -119 ...
..@ lat	: num [1:180] 20.1 20.1 20.2 20.3 20.4 ...
..@ data	: num [1:180, 1:180, 1] 285 292 270 279 262 ...
..@ attribs:List of 6
.. ..$ title	: chr "Ocean Productivity"
.. ..$ longname	: chr "Ocean Net Primary Production"
.. ..$ name	: chr "npp"
.. ..$ units	: chr "mgC m-2 day-1"
.. ..$ temporal_range	: chr "8 day"
.. ..$ spatial_resolution	: chr "9.26 km"
..@ period :List of 2
.. ..$ tmStart	: POSIXct[1:1], format: "2013-03-30"
.. ..$ tmEnd	: POSIXct[1:1], format: "2013-04-06 23:59:59"
..@ depth	: num(0)

Details

Source data file (vgpm.2013089.hdf.gz) was downloaded from the link below, decompressed with gunzip function from R.utils package, then converted to hdf v5 with h4toh5 Conversion Software (https://support.hdfgroup.org/downloads/h4h5tools/h4h5tools_2_2_5.html) before being imported with the read.osunpp function. The selected area covers from 20 to 35 degrees of latitude North and from 119 to 104 degrees of longitude West.

Source

As of September 29, 2025, the Ocean Productivity site (https://orca.science.oregonstate.edu/npp_products.php) is operating with an expired security certificate, and its data has not been updated since February 2024. Despite this, the archived data remains accessible and usable.

References

Behrenfeld, M. J. and Falkowski, P. G. 1997 Photosynthetic rates derived from satellite-based chlorophyll concentration, Limnology and Oceanography, 42, 1–20.

Examples

data(dnpp)
dnpp
str(dnpp)
plot(dnpp, col.sep = 100)

satin documentation built on Nov. 5, 2025, 7:09 p.m.