Sentinel-1 local incidence angle and layover/shadow mask#
sentinel-1-local-incidence-angle · theme sar · live
The angle between the radar look vector and the terrain normal, with the layover and shadow mask: read from the OPERA RTC-S1-STATIC per-burst layers, or computed from any DEM with no account at all (issue #10).
import easysnowdata as esd
aoi = (-121.94, 46.72, -121.54, 46.99) # Mount Rainier
data = esd.sar.sentinel1.local_incidence_angle(aoi, time="2024-03")
Credentials
The default route needs earthdata; see the credentials page for the setup.
An open alternative exists: source="dem".
Sources#
3 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 |
|---|---|---|---|---|---|---|---|
|
stac |
earthdata |
30 m |
global |
static, one granule per burst |
— |
ships local_incidence_angle, incidence_angle, mask (layover/shadow), number_of_looks and the gamma0→beta0/sigma0 factors as COGs |
|
stac |
none |
30 m |
global |
static (DEM epoch) |
— |
computed with processing.sar.local_incidence_angle from the Copernicus GLO-30 DEM; no credentials, any AOI, any orbit |
|
gee |
earthengine |
30 m |
global |
2014-10/present |
— |
the legacy Earth Engine route, kept as a fallback (issue #10) |
Where each route points#
opera-static— OPERA RTC-S1-STATIC (ASF) liveOPERA_L2_RTC-S1-STATIC_V1_1dem— computed from the Copernicus DEM livecop-dem-glo-30gee— Earth Engine (legacy) liveCOPERNICUS/S1_GRD angle band + COPERNICUS/DEM/GLO30
Variables#
variable |
units |
dtype |
nodata |
categorical |
|---|---|---|---|---|
|
degrees |
float32 |
— |
no |
|
degrees |
float32 |
— |
no |
|
— |
uint8 |
255 |
yes (5 classes) |
mask classes (5)
value |
meaning |
|---|---|
0 |
not_layover_shadow_or_water |
1 |
shadow |
2 |
layover |
3 |
layover_and_shadow |
255 |
fill |
Provenance#
Licence · NASA Earthdata (free registration) / Copernicus DEM licence
Cite the data as
OPERA RTC-S1-STATIC, NASA/JPL, distributed by ASF DAAC; European Space Agency, Sinergise (2021), Copernicus Global Digital Elevation Model.
Documentation
Gallery examples#
