@Astro_Kimiya 油井さん、お声がけありがとうございます！ ご撮影のロンドニア地方を「ALOS-2」が撮影した画像(2020)と、同地の1996年の様子を共有します。 時系列で比べると、伐採地（白部分）が急拡大していることが伝わってきます。仰る通り、心配です。 #JAXA #地球を共に感じよう #ALOS2

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ALOS2 · Single · 2024 · 1 songs

I am using G-Portal python client gportal (https://gportal.readthedocs.io/en/stable/) to download ALOS2 data, for example, for the point 67.3624, 26.6386 (one fluxnet site on Sodankyla, Finland) with the mode of Fine[10m] DP. I can find the data on gportal website like shown in the attached figure, but if I run my code, the code returns nothing... Here is finding results in gportal website: And here is my code: # 1) install the client # $ pip install gportal import os import gportal from math import cos, radians #%% # 2) authenticate (you get these when you register on G-Portal) gportal.username = "myusername" gportal.password = "mypassword" # os.environ["GPORTAL_PASSWORD"] # or hard-code (but env-var is safer) #%% # 3) look up the dataset tree and pick the FBD dual-pol mode datasets = gportal.datasets() # drill down until you find the PALSAR-2 / FBDR SLC branch: # e.g. datasets["ALOS-2/PALSAR-2"]["L1.1"]["Fine Beam Dual-polarization"]["SLC"] fbd_dataset_id = datasets["ALOS-2"]['ALOS-2.PALSAR-2']["NA"]["Fine[10m] DP"][0] #%% # 4) compute a 1 km × 1 km bbox around (lon, lat) = (67.3624, 26.6386) center_lon = 67.3624 center_lat = 26.6386 half_side_km = 0.5 # 1° lat ≈ 110.574 km; 1° lon ≈ 111.320 km × cos(lat) delta_lat = half_side_km / 110.574 delta_lon = half_side_km / (111.320 * cos(radians(center_lat))) bbox = [ center_lon - delta_lon, # minLon center_lat - delta_lat, # minLat center_lon + delta_lon, # maxLon center_lat + delta_lat, # maxLat ] print("Using bbox:", bbox) #%% search = gportal.search( dataset_ids=fbd_dataset_id, start_time="2019-06-17T00:00:00", end_time="2022-06-24T23:59:59", bbox=bbox, # params={"polarization": ["HH", "HV"] # }, ) print(f"Found {search.matched()} scenes") products = search.products() #%% # 5) download everything into ./alos2_fbd_slc/ gportal.download(products, local_dir="./alos2_fbd_slc/") But it returns Found 0 scenes...what happened and could you please help me with this? Thanks!

I am new to GEE and want to download ALOS PALSAR2 data for one fluxnet site (-105.1178, 53.9872, in Canada). Here is my script: #!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Created on Tue Mar 11 18:43:06 2025 @author: xshan """ import ee import…