ohagolle

ohagolle, 4 months ago to random French

The Cambre d'Ase (Donkey back) is a mountain in the Eastern Pyrénées, which peaks at 2750 m. Its North Face is almost devoid of snow in early January😱. Some snow might fall this weekend.

ohagolle, 5 months ago to random French

#SilentSunday

ohagolle, 6 months ago to random

After three successive summer droughts in 2018, 2019, and 2020, the dieback of oaks has considerably increased in the center of France.

Florian Mouret and his colleagues from #CESBIO and #Orleans University, have set-up un new method to monitor oak dieback, using #Sentinel2 #EarthObservation data as input, with terrain measurements to train the classification model.

The method uses the #Iota2 opensource framework to process large multi-temporal #timesSries

Details:
https://labo.obs-mip.fr/multitemp/a-new-operational-method-for-monitoring-oak-dieback-in-the-centre-val-de-loire-region/

Trends in predicted dieback between 2017 and 2022 on part of the Orléans forest (north-west). Homogeneous plots (in red) are visible and generally correspond to clear-cuts

ohagolle, 7 months ago to random French

At #CESBIO laboratory, we promote a new very high resolution mission, #SentinelHR, to complement #Sentinel2 with 2 m resolution images acquired with a systematic and global revisit every 10 to 30 days and 4 spectral bands.

We are ready to trade revisit for resolution, as we feel that landscape details with high frequency (buildings, trees, hedges, roads) tend to change less than the low frequency details. But demonstrating it needed work.

We made two studies to try to prove it.
🔽

ohagolle, 8 months ago to random French

New paper ! We measured expected directional effects on thermal infrared satellite images from #TRISHNA, #LSTM or #SBG missions, using simultaneous acquisitions from #LANDSAT and an aerial imager #MASTER from @NASAJPL

Differences up to 4.5 degrees in #TRISHNA field of view have been observed, which can be corrected to less than 2°K using very simple models.

For more details and to access the paper : https://labo.obs-mip.fr/multitemp/hr-tir-da-irl-high-resolution-thermal-infra-red-directional-anisotropy-in-real-life/

ohagolle, 9 months ago to random French

Too hot tonight close to Toulouse