Table of Contents:
- Animation Error
- Large Dataset Error - aka "Remote Server Error"
- Exporting NetCDF files
- Map Scale file not found
- Not currently applying Quality flags to data sets, no Anomaly sets
- HDF5 files and Level 3 data sets do not have units, scale factor, and add offset when displayed
- Have LAS update plots automatically
- Change the Color Bar range
- Compare granules from different data sets
- Have MODIS display units and screen fill values
- Convert Units
- Find a variable's scaling equation, slope, and intercept for Level 3 datasets
General Help:
Known Issues:
Animation gives an error with large datasets when requesting more than ~3 granules. LAS support is looking into this.
Example:
Later versions of LAS color everything as purple, or the lowest value on the color scale.
If this error is encountered, the animate tab needs to be closed, and Animate restarted from LAS.
Currently, the workaround is to request a smaller number of granules, and then after the request completes successfully, to add onto the request a day at a time. This gets the max range to ~9 granules.
Large Dataset Error ("Remote Server Error")
"A remote server was unable to deliver the data LAS needs to make your product."
This error occurs with very large datasets, or high volume datasets. LAS support is aware of the issue and looking into it. The current work-around is to request a smaller range of time.
Exporting (saving out) as netCDF does not save the Offset parameter, giving incorrect values when opened. We are working to resolve this issue. As a workaround, the Offset can be found in the header of the original file, and can be added to the data manually.
Map Scale not found:
LAS saves all request results. The upside is that if the same request is made again, LAS returns the results immediately. The downside is that periodically the disk completely fills, and this error is returned. We are aware of the issue and working on a long term automated solution.
How To:
How to have LAS update the plot automatically:
Check the box on the Update Plot button.
How to change the color range:
Go to Set Plot Options, and to the Color Fill field.
Enter the desired range, in the format (min, max, step).
Press okay and update the plot.
Visual Example:
Click on the Set Plot Options button.
In Color Fill, type in the range desired, as such: (min, max, step)
In this example, we first choose (272,300,1)
Gives:
This has lots of white, areas that must be out of the range. To reserve the top and bottom colors for all the values out of the color range, use (lower bound)(min, max, step)(upper bound).
For example: (260)(272,300,1)(310)
Gives:
Refining the range: (260)(270,305,1)(210)
Gives:


Then select the date desired, and click “Update Plots in the upper left main suite of buttons. The lat/lon coordinates may need to be adjusted to match the first granule's coordinates.



In Color Fill, type in the range desired, as such: (min, max, step)

In this example, we first choose (272,300,1)

Gives:


Gives:

Refining the range: (260)(270,305,1)(210)

Gives:


Set the Equation to convert Kelvin to Celsius in the Evaluate Field: $ -273.15


Gives:


Gives:


First, use the Set Plot Options -> Evaluate Expression to change the unitless values to known units. The equation is: 0.000717185 * $ -2, as the scale factor (slope) is 0.000717185, and the intercept is -2. Enter the equation and click "update plot".


Now to filter out the "Fill values". Open Set Plot Options, and in the Color Fill Level, enter (0,32,2), click OK, and then Update Plot. This sets the minimum to 0 C, the maximum to 32 C, and has a color step of 2 degrees.



Clicking on the “?” opens a new browser window with metadata and links for the dataset & variables:

Clicking on “See the URLs” gives this:

These links go to the OPeNDAP URLs. This is great for direct downloading, but also for viewing information about the variables in full – which is what we’re after in this instance. Clicking on the link for the l3m_data goes to OPeNDAP:

Scroll down to the variable being plotted in LAS – l3m_data in this case:
