UCLA snow reanalysis (Western US and High Mountain Asia)#

ucla-snow-reanalysis · theme snow · live

Daily 480 m posterior SWE, snow depth and snow-covered area from the UCLA particle-batch-smoother reanalysis: water years 1985–2021 over the western United States (WUS_UCLA_SR v1) and 2000–2017 over High Mountain Asia (HMA_SR_D v1), each with five ensemble statistics.

import easysnowdata as esd

aoi = (-121.94, 46.72, -121.54, 46.99)   # Mount Rainier
data = esd.snow.ucla_sr.load(aoi, time="2024-03")

Credentials

The default route needs earthdata; see the credentials page for the setup.

Sources#

2 routes serve this product; the first is the default and source= picks another. The return contract is the same either way.

source

provider

credentials

resolution

extent

temporal

latency

notes

nsidc (default)

earthdata

earthdata

480 m

western US

1984-10/2021-09

static

one NetCDF-4 granule per water year and 1° tile; no DMR++ sidecars, so virtualize=’auto’ scans HDF5 metadata once and caches references

nsidc-hma

earthdata

earthdata

480 m

High Mountain Asia

1999-10/2017-09

static

the High Mountain Asia sibling of the same reanalysis

Where each route points#

nsidc — NSIDC (Earthdata) live

WUS_UCLA_SR

nsidc-hma — NSIDC HMA (Earthdata) live

HMA_SR_D

Variables#

variable

units

dtype

nodata

categorical

SWE_Post

m

float32

—

no

SCA_Post

1

float32

—

no

SD_Post

m

float32

—

no

Provenance#

Licence · NASA Earthdata (free registration)

DOI · 10.5067/PP7T2GBI52I2

Cite the data as

Fang, Y., Liu, Y. and Margulis, S. A. (2022). Western United States UCLA Daily Snow Reanalysis, Version 1. NASA NSIDC DAAC. Liu, Y., Fang, Y. and Margulis, S. A. (2021). High Mountain Asia UCLA Daily Snow Reanalysis, Version 1.

Documentation

Loader · easysnowdata.snow.ucla_sr.load