Manipulating Data in the Data Library

I am using monthly data. How do I create a monthly average over several years?

Let's use the NOAA/NCDC/GHCN/v2 dataset as an example.

How do I select data that is within a particular range of values?

The ECO by only displaying indices representative of grassland vegetation.

I am using monthly data. How do I create seasonal averages?

This example begins with the dataset, station, and variable already selected.

I am using gridded data. How do I create a spatial average?

You can do this two different ways.

I am using daily data. How do I create a dataset of only one day out of the calendar year?

Let's use the NOAA/NCDC/DAILY/FSOD precpitation data for July 4 in New York City as an example.

How do I plot the difference between data from two different times within a defined region?

Let's start with the IGOSS/NMC/MONTHLY dataset.

I am using monthly data. How do I create data representing annual totals?

Let's start with the NOAA/NCDC/GHCN/v2beta dataset for New York City.

How do I overlay one piece of data onto another in the Data Viewer?

Let's overlay sea level pressure and wind vectors from CDAS-1

How do I find the average of two data fields?

Using the FSOD dataset for New York, we can obtain both minimum and maximum temperature data.

How do I select data from a specific time or location?

Data from a specific time and location can be selected in a number of ways and a few of them are described below

How do I correlate two different variables in a datset?

Let's use the OBERHUBER dataset as an example and correlate latent heat flux and sea surface temperature.

How do I find all stations that have record maximum and minimum temperatures within a specific range?

A good place to start is the U.S. National Climatic Data Center Global Historical Climatology Network dataset

I am having trouble finding data for stations that I know exist in a dataset. I have searched for both their names and WMO IDs. Can you help?

There are a few reasons why you were not able to find data for the stations in which you are interested.

I am using deep sea core data. How do I select data from cores with approximately the age?

From the LDEO/Deep_Sea_Core dataset

Does the Data Library allow me to replace missing data with a constant value?

It is a possible to replace NaN values with any constant value that you wish.

What does the yearly-anomalies command actually calculate?

Given the region and time period you have selected, it calculates a monthly climatology over the years you have selected and then subtracts these climatological values from the original values.

How do I calculate a seasonal average from certain composite years and then subtract it from that of another set of years?

Start with the UMD Carton Global Ocean Analysis dataset

How do I create an annual composite of monthly data?

This operation can be done with a few ingrid commands in expert mode and they can be seen at the following link

Is it possible to change axis labels in the data viewer?

The axis labels used in the data viewer can be changed, though you must use expert mode to make the changes. For example, let's change one of the axis labels used in the Sandwell Seafloor dataset.

I want to do a series of arithmetic operations on my data. Can you help me?

Let's use zonal and meridional wind data from the NCEP-NCAR Reanalysis.

How do I make animated figures?

It is extremely easy to make animations in the data viewer. Let's make an animated image of the 1982-1983 El Niño.

Can I select data from only the most recent time increment?

Yes, there is an Ingrid command that will retrieve data from the most recent time increment included in a dataset.

How do I use the Data Library to access data on another DODS Server?

Accessing data from another DODS/OPeNDAP Server is fairly simple.