Sajad Sayadi
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sajadsayadi.bsky.social
Sajad Sayadi
@sajadsayadi.bsky.social
1.3K followers 11K following 8 posts
M.Sc. Graduate, KNT University
Photogrammetry | Remote Sensing

Remote Sensing → Environmental Monitoring, Forest Ecology, Wildfire

Photogrammetry → Bundle Adjustment, UAV, Canopy Cover

#RemoteSensing #Photogrammetry #UAV #Drone #DeepLearning #GIS
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sajadsayadi.bsky.social
Sajad Sayadi @sajadsayadi.bsky.social · Sep 22
‪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.
Reposted by Sajad Sayadi
pmgibbs.bsky.social
An oak leaf floating on water
October 17, 2025 at 9:01 PM
sajadsayadi.bsky.social
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
skogrover.bsky.social SkogRover @skogrover.bsky.social · Oct 16
Can site index be determined using branch whorls detected by deep learning from very dense laser scanning data? 🌲

Check out our newly published paper to find out!

academic.oup.com/forestry/adv...
October 16, 2025 at 5:01 PM
sajadsayadi.bsky.social
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
October 13, 2025 at 2:40 AM
sajadsayadi.bsky.social
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).
September 27, 2025 at 11:26 AM
sajadsayadi.bsky.social
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
September 24, 2025 at 6:22 PM
sajadsayadi.bsky.social
‪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.
September 22, 2025 at 4:54 PM