Knowledge Base

ICESat
ICESat - FAQ
Why are laser footprint shape parameters not available for low energy campaigns?

Several parameters help quantify the shape of the GLAS laser footprint ... Read more
What is the basic difference between a standard and alternate waveform fit and when would you normally choose one over the other?

The standard waveform fit is optimized for "ice sheet-like" returns. ... Read more
What is meant by the first and last shot in the record?

There are 40 laser shots in one second which are associated with the ... Read more
In the GLAS altimetry products, is there an indicator to the presence of clouds?

Yes, it is an element of GLAH06, GLAH12, GLAH13, GLAH14, and GLAH15. ... Read more
How is the surface elevation at each laser footprint determined?

In short, the elevation of the surface at each laser footprint is the ... Read more
What is the accuracy of GLAS elevation measurements?

Surface roughness greatly affects the elevation measurement accuracy. ... Read more
Are the altimetry data adjusted to the Geoid, or only to the Ellipsoid?

The elevation data are relative to the ellipsoid. The data also have a ... Read more
How often were data collected for a given geographic area?

The first several months of ICESat operations were in an orbit that ... Read more
How does GLAS geolocate data and provide off-nadir pointing?

Analysis of altimetric data acquired by the GLAS instrument requires ... Read more
What data subsetting and reformatting services are available for ICESat/GLAS data?

The following table describes the data subsetting and reformatting ... Read more
ICESat - How To
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I order subsetted ICESat/GLAS HDF5 data in Earthdata Search?

NASA Earthdata Search ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
Stepping through the HDFView User Guide with GLAS HDF5 Data

HDFView

... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I import GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica into ArcMap?

The following steps outline the process for visualizing the GLAS/ICESat ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do you compute sea ice freeboard using GLAH13 data?

"Freeboard" is a measure of the height of sea ice above the ocean ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How to read GLAS HDF5 data into MATLAB, IDL, Python, or NCL

... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more
How do I programmatically request data services such as subsetting, reformatting, and reprojection using an API?

On 31 October 2018, system upgrades lead to a ... Read more