Issue with using CRSs without EPSG code

OS: Ubuntu 18.04

Environment Used: Anaconda environment

Library versions: pyroSAR: version 0.11.1 from conda-forge SNAP: 8.0

Objective: I wanted to reproject (to South LAEA) and apply speckle filtering to a couple of Sentinel SAR images that I have acquired. However I am unable to do so.

Code:

from pathlib import Path
from pyroSAR.snap import geocode

outdir = './outdir'
# South Lambert Equal Area Projection (ESRI:102020)
out_proj = "+proj=laea +lat_0=-90 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"

sar_zips = [ str(Path.cwd() / i) for i in Path('./data').iterdir() if i.suffix == ".zip"]
geocode(infile=sar_zips[0], outdir=outdir, t_srs=out_proj, speckleFilter="Lee")

This snippet outputs

searching for new POE files
https://qc.sentinel1.eo.esa.int/api/v1/?product_type=AUX_POEORB&sentinel1__mission=S1B&validity_start__gte=2019-08-19T07:52:49&validity_stop__lte=2019-08-21T07:52:49
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-15-10d2a2932d21> in <module>
----> 1 geocode(infile=sar_zips, outdir=outdir, t_srs=out_proj, speckleFilter="Lee")

~/anaconda3/envs/sar/lib/python3.6/site-packages/pyroSAR/snap/util.py in geocode(infile, outdir, t_srs, tr, polarizations, shapefile, scaling, geocoding_type, removeS1BorderNoise, removeS1BorderNoiseMethod, removeS1ThermalNoise, offset, allow_RES_OSV, demName, externalDEMFile, externalDEMNoDataValue, externalDEMApplyEGM, terrainFlattening, basename_extensions, test, export_extra, groupsize, cleanup, gpt_exceptions, gpt_args, returnWF, nodataValueAtSea, demResamplingMethod, imgResamplingMethod, speckleFilter, refarea)
    384 
    385     try:
--> 386         t_srs = crsConvert(t_srs, 'epsg')
    387     except TypeError:
    388         raise RuntimeError("format of parameter 't_srs' not recognized")

~/anaconda3/envs/sar/lib/python3.6/site-packages/spatialist/auxil.py in crsConvert(crsIn, crsOut)
     77         return srs.ExportToProj4()
     78     elif crsOut == 'epsg':
---> 79         srs.AutoIdentifyEPSG()
     80         return int(srs.GetAuthorityCode(None))
     81     elif crsOut == 'opengis':

~/anaconda3/envs/sar/lib/python3.6/site-packages/osgeo/osr.py in AutoIdentifyEPSG(self, *args)
    564     def AutoIdentifyEPSG(self, *args):
    565         """AutoIdentifyEPSG(SpatialReference self) -> OGRErr"""
--> 566         return _osr.SpatialReference_AutoIdentifyEPSG(self, *args)
    567 
    568 

RuntimeError: OGR Error: Unsupported SRS

Edit: I tried using osr and importing the wkt representation of South LAEA

wkt = """PROJCS["South_Pole_Lambert_Azimuthal_Equal_Area",GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],PARAMETER["Latitude_Of_Origin",-90],UNIT["Meter",1],AUTHORITY["EPSG","102020"]]"""
out_proj2 = osr.SpatialReference(wkt)

geocode(
    infile=sar_zips[0],
    outdir=outdir,
    t_srs=out_proj2,
    scaling="linear",
    speckleFilter="Refined Lee",
)

This worked till the Terrain Correction part, but failed for a similar reason.

searching for new POE files
https://qc.sentinel1.eo.esa.int/api/v1/?product_type=AUX_POEORB&sentinel1__mission=S1A&validity_start__gte=2020-03-16T22:55:06&validity_stop__lte=2020-03-18T22:55:06
unpacking scene
removing border noise..
border noise removal not necessary for IPF version 3.2
executing node sequences..
ThermalNoiseRemoval
Apply-Orbit-File
Calibration
Terrain-Flattening
Speckle-Filter
Terrain-Correction
Executing processing graph
No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".
 done.
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Initializing external tool adapters
INFO: org.esa.s2tbx.dataio.gdal.GDALVersion: Incompatible GDAL 3.1.4 found on system. Internal GDAL 3.0.0 from distribution will be used.
INFO: org.esa.s2tbx.dataio.gdal.GDALVersion: Internal GDAL 3.0.0 set to be used by SNAP.
INFO: org.esa.snap.core.util.EngineVersionCheckActivator: Please check regularly for new updates for the best SNAP experience.
INFO: org.esa.s2tbx.dataio.gdal.GDALVersion: Internal GDAL 3.0.0 set to be used by SNAP.
INFO: org.hsqldb.persist.Logger: dataFileCache open start
org.esa.snap.core.gpf.graph.GraphException: [NodeId: Terrain-Correction] No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".
	at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:79)
	at org.esa.snap.core.gpf.graph.GraphContext.initNodeContext(GraphContext.java:199)
	at org.esa.snap.core.gpf.graph.GraphContext.initNodeContext(GraphContext.java:182)
	at org.esa.snap.core.gpf.graph.GraphContext.initOutput(GraphContext.java:166)
	at org.esa.snap.core.gpf.graph.GraphContext.<init>(GraphContext.java:85)
	at org.esa.snap.core.gpf.graph.GraphContext.<init>(GraphContext.java:58)
	at org.esa.snap.core.gpf.graph.GraphProcessor.executeGraph(GraphProcessor.java:118)
	at org.esa.snap.core.gpf.main.DefaultCommandLineContext.executeGraph(DefaultCommandLineContext.java:86)
	at org.esa.snap.core.gpf.main.CommandLineTool.executeGraph(CommandLineTool.java:547)
	at org.esa.snap.core.gpf.main.CommandLineTool.runGraph(CommandLineTool.java:391)
	at org.esa.snap.core.gpf.main.CommandLineTool.runGraphOrOperator(CommandLineTool.java:287)
	at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:188)
	at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:121)
	at org.esa.snap.core.gpf.main.GPT.run(GPT.java:54)
	at org.esa.snap.core.gpf.main.GPT.main(GPT.java:34)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.esa.snap.runtime.Launcher.lambda$run$0(Launcher.java:55)
	at org.esa.snap.runtime.Engine.runClientCode(Engine.java:189)
	at org.esa.snap.runtime.Launcher.run(Launcher.java:51)
	at org.esa.snap.runtime.Launcher.main(Launcher.java:31)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84)
	at com.install4j.runtime.launcher.UnixLauncher.start(UnixLauncher.java:66)
	at install4j.org.esa.snap.runtime.Launcher1159904018.main(Unknown Source)
Caused by: org.esa.snap.core.gpf.OperatorException: No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".
	at org.esa.snap.engine_utilities.gpf.OperatorUtils.catchOperatorException(OperatorUtils.java:440)
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.initialize(RangeDopplerGeocodingOp.java:349)
	at org.esa.snap.core.gpf.internal.OperatorContext.initializeOperator(OperatorContext.java:528)
	at org.esa.snap.core.gpf.internal.OperatorContext.getTargetProduct(OperatorContext.java:298)
	at org.esa.snap.core.gpf.Operator.getTargetProduct(Operator.java:385)
	at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:77)
	... 29 more
Caused by: org.esa.snap.core.gpf.OperatorException: No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.createTargetProduct(RangeDopplerGeocodingOp.java:564)
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.initialize(RangeDopplerGeocodingOp.java:306)
	... 33 more
Caused by: org.opengis.referencing.NoSuchAuthorityCodeException: No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".
	at org.geotools.referencing.factory.AbstractAuthorityFactory.noSuchAuthorityCode(AbstractAuthorityFactory.java:875)
	at org.geotools.referencing.factory.epsg.DirectEpsgFactory.createCoordinateReferenceSystem(DirectEpsgFactory.java:2239)
	at org.geotools.referencing.factory.BufferedAuthorityFactory.createCoordinateReferenceSystem(BufferedAuthorityFactory.java:732)
	at org.geotools.referencing.factory.AuthorityFactoryAdapter.createCoordinateReferenceSystem(AuthorityFactoryAdapter.java:780)
	at org.geotools.referencing.factory.BufferedAuthorityFactory.createCoordinateReferenceSystem(BufferedAuthorityFactory.java:732)
	at org.geotools.referencing.factory.AuthorityFactoryAdapter.createCoordinateReferenceSystem(AuthorityFactoryAdapter.java:780)
	at org.geotools.referencing.factory.FallbackAuthorityFactory.createCoordinateReferenceSystem(FallbackAuthorityFactory.java:625)
	at org.geotools.referencing.factory.AuthorityFactoryAdapter.createCoordinateReferenceSystem(AuthorityFactoryAdapter.java:780)
	at org.geotools.referencing.factory.ThreadedAuthorityFactory.createCoordinateReferenceSystem(ThreadedAuthorityFactory.java:636)
	at org.geotools.referencing.DefaultAuthorityFactory.createCoordinateReferenceSystem(DefaultAuthorityFactory.java:177)
	at org.geotools.referencing.CRS.decode(CRS.java:517)
	at org.esa.s1tbx.commons.CRSGeoCodingHandler.getCRS(CRSGeoCodingHandler.java:173)
	at org.esa.s1tbx.commons.CRSGeoCodingHandler.<init>(CRSGeoCodingHandler.java:55)
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.createTargetProduct(RangeDopplerGeocodingOp.java:530)
	... 34 more

Error: [NodeId: Terrain-Correction] No code "EPSG:102020" from authority "European Petroleum Survey Group" found for object of type "CoordinateReferenceSystem".

[S1A_EW_GRDH_1SSH_20200317T225506_20200317T225606_031721_03A873_CB43_tmp5.xml] failed with return code 1
failed: ./outdir/S1A__EW___A_20200317T225506_HH_NR_Orb_TF_Spk_TC/S1A__EW___A_20200317T225506_HH_NR_Orb_TF_Spk_TC_proc.xml

How can I correctly reproject my SAR files to South LAEA using pyroSAR?

[johntruckenbrodt]

For sure, path issues always add some spice to our daily work 😜. Glad you found the error and sorry for not being able to respond sooner.

The conda package of spatlialist version 0.7 is now online. Looks like this is under control.

[johntruckenbrodt]

Hi @ashnair1, the central function for CRS handling in pyroSAR is spatialist.crsConvert, which makes use of OSR. First, the CRS input to the geocode function is converted to EPSG so that the CRS can we written in the SNAP XML workflow like this: ‘EPSG:4326’ to save space. The South LAEA CRS apparently does not have a EPSG code. However, in the following example the ESRI code is returned as EPSG code:

from osgeo import osr

crs = """PROJCS["South_Pole_Lambert_Azimuthal_Equal_Area",GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],PARAMETER["Latitude_Of_Origin",-90],UNIT["Meter",1],AUTHORITY["EPSG","102020"]]"""

srs = osr.SpatialReference(crs)

# convert to EPSG code
srs.AutoIdentifyEPSG()
auth = srs.GetAuthorityName(None)
code = int(srs.GetAuthorityCode(None))
string = '{}:{}'.format(auth, code)
print(string)

# re-convert EPSG code to OSR SpatialReference
# will fail because EPSG code 102020 is not recognized
srs = osr.SpatialReference()
srs.ImportFromEPSG(code)
print(srs)

I don’t know why this happens. I am sure there is a reason for it but to me it looks strange.
I have introduced a new check in crsCovert with commit johntruckenbrodt/spatialist@5e803b4 so that 102020 is not returned as EPSG code (because it is an ESRI code) but a RuntimeError is raised instead. In a next step I’ll adjust the geocode function so that the WKT representation is written to the SNAP workflow if this error occurs. I’ll keep you posted on my progress.