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Sajad Sayadi

@sajadsayadi.bsky.social

1.8K followers 1.1K following 9 posts

M.Sc. Graduate, KNT University Remote Sensing | Photogrammetry ---→ Environmental Monitoring, Forest Ecology, Wildfire, UAV Photogrammetry, Bundle Adjustment, Canopy Cover #RemoteSensing #Photogrammetry #UAV #Drone #DeepLearning #GIS

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Sajad Sayadi @sajadsayadi.bsky.social · 19/12/2025

Stepping out of the forest for a day to apply my Remote Sensing expertise to the urban landscape! Presented my poster on detecting thermal anomalies using Time-Series analysis at the 8th ISPRS Geospatial Conference 2025. #RemoteSensing #ISPRS #TimeSeries #LST #ISPRSConference 🌐🌍🛰️🍁🌲🔥

The 8th ISPRS Geospatial Conference 2025 at the University of Tehran, Iran, December 16, 2025. A research poster titled "Detection and Attribution of Thermal Anomalies in Urban Blocks of Qom Using Time-Series Analysis of TIR Imagery". The visual content includes spatial distribution maps of 22 identified thermal anomalies and LST time-series graphs. The methodology highlights Median Absolute Deviation (MAD) for outlier removal and noise filtering and the Reed-Xiaoli (RX) algorithm for anomaly detection and identifying deviated thermal behaviors.

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Reposted by Sajad Sayadi

pm gibbs @pmgibbs.bsky.social · 17/10/2025

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Sajad Sayadi @sajadsayadi.bsky.social · 16/10/2025

A very fascinating and detailed study on estimating Site Index using mobile laser scanning and deep learning, along with an excellent discussion on the challenges ahead. 🍁 🌳🔥 🌐 #ForestEcology Thanks to @mariamoan.bsky.social and @hansoleorka.bsky.social and co-authors. @skogrover.bsky.social

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Sajad Sayadi @sajadsayadi.bsky.social · 13/10/2025

No matter what camera you use to capture images, you need to understand how rolling shutter and global shutter work and what sets them apart. #Photogrammetry #Imaging #Shutter #UAVphotogrammetry #3DModeling #RemoteSensing #CameraTech

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Sajad Sayadi @sajadsayadi.bsky.social · 27/09/2025

Looking for something better than NDVI as a vegetation index? Follow the flowchart below. #RemoteSensing #Vegetationindex #NDVI #EVI #Sentinel2 #Workflow See more details here👉 doi.org/10.1109/Metr...

Flowchart for moving beyond NDVI: Sentinel-2 multispectral data feeds two paths: (a) Generation of NDVI; (b) Calculate EVI coefficients with PSO → Classification with EVI. In parallel, Google Earth imagery → Manual classification (veg/non-veg).

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Sajad Sayadi @sajadsayadi.bsky.social · 24/09/2025

We conducted a binary visual comparison of EVI vegetation maps (traditional vs optimized) over a semi-arid mountain site. #RemoteSensing #EVI #SemiArid #VegetationIndex #Optimization #Binarymap See more details here👇 doi.org/10.1109/Metr...

Red: vegetation by tuned EVI but non-vegetation by traditional EVI; Blue: the opposite

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Sajad Sayadi @sajadsayadi.bsky.social · 22/09/2025

‪Sajad Sayadi‬ Classic NDVI can be fuzzy over bright soils and sparse canopies. We re-parameterized EVI with PSO for semi-arid mountains on Sentinel-2. Have you tried scene-specific EVI tuning? #RemoteSensing #EVI #Vegetation #Indexes #PSO #Sentinel2 See more details here👇 doi.org/10.1109/Metr...

NDVI (left) vs PSO-tuned EVI (right) in semi-arid mountains; the optimized EVI produced a wider vegetation value range, higher variance, and mapped more vegetation pixels than NDVI and the conventional EVI.

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