Results 171 to 180 of about 17,654,855 (215)

Gravitation-Based Bilateral Filtering of ALOS-2 PALSAR-2 Polarimetric Data

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
Speckle filtering is often carried out to improve the interpretation of polarimetric synthetic aperture radar (PolSAR) data for terrain classification, retrieval of physical scattering properties etc. As inspired by Newton's law of universal gravitation, a force of attraction between two image pixels is formulated in polarimetric-spatial domain.
Ken Yoong Lee, Chen Guang Hou, Soo Chin Liew, Leong Keong Kwoh   +3 more
openaire   +1 more source

Development status of PALSAR-2 onboard ALOS-2

SPIE Proceedings, 2011
The Advanced Land Observing Satellite-2 (ALOS-2) carries the state-of-the-art L-band Synthetic Aperture Radar (SAR) called PALSAR-2. PALSAR-2 has a Spotlight mode (1 to 3 m), a Stripmap mode (3 to 10 m) and a ScanSAR mode, whilst PALSAR onboard ALOS had 10 m spatial resolution at best. The new technologies, such as maximum bandwidth allocation for L-
Shinichi Suzuki, Yukihiro Kankaku, Yuji Osawa   +2 more
openaire   +1 more source

Polarimetric characteristics of temporarily coherent RFI in alos-2 palsar-2

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
This paper reports the polarimetric characteristics of temporarily coherent radio frequency interference (RFI) observed by ALOS-2 PALSAR-2. The RFI has high interferometric coherence as if it is a backscattered signal from the ground. However, its radio frequency band and the Doppler frequency are different from the backscattered signal.
Ryo Natsuaki, Takeshi Motohka, Takeo Tadono, Shinichi Suzuki   +3 more
openaire   +1 more source

Unsupervised Objects Classification in ALOS-2 PALSAR-2 Images

2020 IEEE Ukrainian Microwave Week (UkrMW), 2020
The paper suggests a new method for the unsupervised classification of multi-channel radar images on the basis of full polarimetric information. The main stages of the method are data preprocessing (with radiometric and geometric correction), synthesis of the hue-saturation-value image, threshold pixel-based segmentation according to the criterion of ...
Irina Vasil'eva, Anatoliy Popov
openaire   +1 more source

Evaluation of Reinforced Slope Dynamics Using ALOS-2/PALSAR-2

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Reinforced slope dynamics can be studied using the synthetic aperture radar (SAR) backscattering analysis. This study provides the results of the InSAR analysis obtained from the reinforced slope monitoring by ALOS-2/PALSAR- 2. The vertical displacement values from the GEONET and the Line-of-Sight InSAR analysis have been compared.
Tomohito Asaka, Takashi Nonaka, Keishi Iwashita, Sasayoshi Aoyama, Toshiro Sugimura   +4 more
openaire   +1 more source

Pixel-Based Deforestation Detection Algorithm for ALOS-2/PALSAR-2

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
In order to reduce speckle noise effects in forest cover change analysis, two types of SAR processing approach have been proposed so far. One is a type of object-based segmentation approaches and another is pixel-based processing approaches using speckle noise filtering such as Lee and Frost filter.
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadono, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada   +6 more
openaire   +1 more source

Emergency observation and disaster monitoring performed by ALOS-2 PALSAR-2

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
One of the main missions of the Advanced Land Observing Satellite-2 (ALOS-2, “DAICHI-2” ) is the disaster monitoring. Japan Aerospace Exploration Agency (JAXA) has operated the emergency observation more than hundred times in 2015. Not only the most important event in 2015, the Mw 7.8 Gorkha earthquake on April 25, the Phased Array type L-band ...
Ryo Natsuaki, Takeshi Motohka, Manabu Watanabe, Masato Ohki, Rajesh Bahadur Thapa, Hiroto Nagai, Takeo Tadono, Masanobu Shimada, Shinichi Suzuki   +8 more
openaire   +1 more source

An Improvement in the Relation Between PALSAR-2 Backscatter and Forest Stand Volume

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
This study was conducted to improve normalized backscattering coefficients of synthetic aperture radar (SAR) data for topographic effects reduction. The SAR data in the study is ALOS-2 PALSAR-2 with 6-m resolution for Kwangneung experimental forest (KEF) that was acquired on April 7, 2015.
Min-Gee Hong, Choen Kim
openaire   +1 more source

Change Detection in Bi-Temporal Alos-2 Palsar-2 Polarimetric Data

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
This paper examines two test statistics, namely, likelihood ratio statistic and Roy's largest eigenvalue, for detecting changes in multi-look bi-temporal ALOS-2 PALSAR-2 fully polarimetric data. The latter turns into the well-known intensity ratio when applying to single-polarization data.
Ken Yoong Lee, Chen Guang Hou, Soo Chin Liew, Leong Keong Kwoh   +3 more
openaire   +1 more source

Radio frequency interference in ALOS-2 PALSAR-2 interferogram

2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2017
In this paper, a Radio frequency interference (RFI) in ALOS-2 PALSAR-2 interferogram is discussed. L-band synthetic aperture radar (SAR) systems share the band with global navigation satellite systems (GNSS), communication systems and aircraft surveillance radars, resulting in severe effect of RFIs.
Ryo Natsuaki, Takeshi Motohka, Shinichi Suzuki, Takeo Tadono   +3 more
openaire   +1 more source