New Methods of Change Detection Using Multispectral Data

1991 ◽  
Author(s):  
Charles Sheffield ◽  
Gil Richardson
Keyword(s):  
Change Detection ◽  
Multispectral Data ◽  
New Methods

scholarly journals FEASIBILITY OF MULTISPECTRAL AIRBORNE LASER SCANNING FOR LAND COVER CLASSIFICATION, ROAD MAPPING AND MAP UPDATING

2017 ◽  
Vol XLII-3/W3 ◽  
pp. 119-122 ◽  
Author(s):  
L. Matikainen ◽  
K. Karila ◽  
J. Hyyppä ◽  
E. Puttonen ◽  
P. Litkey ◽  
...  
Keyword(s):  
Land Cover ◽  
Change Detection ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Land Cover Classification ◽  
Aerial Images ◽  
Multispectral Data ◽  
Airborne Laser ◽  
First Results ◽  
Road Mapping

This article summarises our first results and experiences on the use of multispectral airborne laser scanner (ALS) data. Optech Titan multispectral ALS data over a large suburban area in Finland were acquired on three different dates in 2015–2016. We investigated the feasibility of the data from the first date for land cover classification and road mapping. Object-based analyses with segmentation and random forests classification were used. The potential of the data for change detection of buildings and roads was also demonstrated. The overall accuracy of land cover classification results with six classes was 96 % compared with validation points. The data also showed high potential for road detection, road surface classification and change detection. The multispectral intensity information appeared to be very important for automated classifications. Compared to passive aerial images, the intensity images have interesting advantages, such as the lack of shadows. Currently, we focus on analyses and applications with the multitemporal multispectral data. Important questions include, for example, the potential and challenges of the multitemporal data for change detection.

The regularized iteratively reweighted object-based MAD method for change detection in bi-temporal, multispectral data

2016 ◽  
Author(s):  
Qiangqiang Xu ◽  
Zhengjun Liu ◽  
Fangfang Li ◽  
Mingze Yang ◽  
Haicheng Ren
Keyword(s):  
Change Detection ◽  
Multispectral Data ◽  
Object Based

scholarly journals PECULIARITIES OF MONITORING OF AGRICULTURAL LANDS USING VARIOUS TYPES OF AEROSPACE IMAGES

2019 ◽  
Vol 4 (2) ◽  
pp. 205-212
Author(s):  
Larisa Evstratova
Keyword(s):  
Agricultural Lands ◽  
Multispectral Data ◽  
New Methods ◽  
Different Types ◽  
Multi Temporal ◽  
Experimental Works ◽  
Automated Interpretation ◽  
Theoretical Issues ◽  
Standard Software ◽  
Aerospace Images

Some peculiarities of agricultural lands monitoring using various types of aerospace images are reflected in the paper. It is noted that radar, multispectral data of high and medium spatial resolution, as well as materials from unmanned aerial vehicles recently became available. In this regard, the range of tasks that can be solved by using aerospace images expanded. The main theoretical issues of combining multi-temporal images are considered. Algorithms and methods of transformation of images are discussed, as well as the results of the researches of algorithms that are used in standard software. The necessity of developing new methods aimed at comprehensive analysis of aerospace images of different types is noted. Some aspects of planning of experimental works to research the various stages of image processing technology for automated interpretation, which will improve the reliability and efficiency of agricultural lands monitoring, are considered.

Replication of Wet Objects and Cells

1974 ◽  
Vol 32 ◽  
pp. 102-103
Author(s):  
S. Basu ◽  
D. F. Parsons
Keyword(s):  
Water Vapor Pressure ◽  
High Vacuum ◽  
Polystyrene Latex ◽  
Vacuum System ◽  
Saturated Water Vapor ◽  
Replication Method ◽  
New Methods ◽  
Saturated Water ◽  
Water Vapors ◽  
Intermediate Chamber

We are approaching the invasiveness of cancer cells from the studies of their wet surface morphology which should distinguish them from their normal counterparts. In this report attempts have been made to provide physical basis and background work to a wet replication method with a differentially pumped hydration chamber (Fig. 1) (1,2), to apply this knowledge for obtaining replica of some specimens of known features (e.g. polystyrene latex) and finally to realize more specific problems and to improvize new methods and instrumentation for their rectification. In principle, the evaporant molecules penetrate through a pair of apertures (250, 350μ), through water vapors and is, then, deposited on the specimen. An intermediate chamber between the apertures is pumped independently of the high vacuum system. The size of the apertures is sufficiently small so that full saturated water vapor pressure is maintained near the specimen.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

Directional observation on lipid of male nectary of Lindera megaphylla hemsl. by the rapid embedding method with polyethylene glycol (PEG)

1990 ◽  
Vol 48 (3) ◽  
pp. 718-719
Author(s):  
Dai Dalin ◽  
Guo Jianmin
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Chemical Reaction ◽  
Traditional Method ◽  
Osmium Tetroxide ◽  
Unsaturated Lipid ◽  
Embedding Method ◽  
Long Period ◽  
New Methods

Lipid cytochemistry has not yet advanced far at the EM level. A major problem has been the loss of lipid during dehydration and embedding. Although the adoption of glutaraldehyde and osmium tetroxide accelerate the chemical reaction of lipid and osmium tetroxide can react on the double bouds of unsaturated lipid to from the osmium black, osmium tetroxide can be reduced in saturated lipid and subsequently some of unsaturated lipid are lost during dehydration. In order to reduce the loss of lipid by traditional method, some researchers adopted a few new methods, such as the change of embedding procedure and the adoption of new embedding media, to solve the problem. In a sense, these new methods are effective. They, however, usually require a long period of preparation. In this paper, we do research on the fiora nectary strucure of lauraceae by the rapid-embedding method wwith PEG under electron microscope and attempt to find a better method to solve the problem mentioned above.

Sign in / Sign up

Export Citation Format

Share Document