Essay about A Localised Cloud Masking Method for Malaysia

Essay about A Localised Cloud Masking Method for Malaysia

Length: 3059 words (8.7 double-spaced pages)

Rating: Term Papers

Open Document

Essay Preview

Abstract - Two methods of cloud masking tuned to Malaysian conditions have been developed, based on spectral analysis and Principal Components Analysis (PCA) of MODIS data. In the spectral approach, thresholds were applied to four reflective bands (1, 2, 3, and 4), three thermal bands (29, 31 and 32), the band 2/band_1 ratio, and the difference between band 29 and 31 in order to detect cloud. The PCA test applied a threshold to the first principal component derived from the seven quantities used for spectral analysis. Cloud detections were compared with the standard MODIS cloud mask, and their accuracy was assessed using reference images and geographical information on the study area.

Keywords: Cloud masking, spectral analysis, Principal Components Analysis , reflectance, brightness temperature

1. INTRODUCTION

Typically, 50% of the Earth’s surface is covered by cloud at any time, where cloud is defined as a visible mass of condensed water droplets or ice crystals suspended in the atmosphere above the Earth's surface. In remote sensing, clouds are generally characterized by higher reflectance and lower temperature than the background. Thick opaque cloud blocks almost all information from the surface or near surface, while thin cloud has some physical characteristics similar to other atmospheric constituents. Misinterpretation of cloud may result in inaccuracy of various remote sensing applications, ranging from land cover classification to retrieval of atmospheric constituents (e.g. in air pollution studies).

Several cloud detection and masking studies have been reported in the literature. However, most of these algorithms were designed for the global scale (Rossow & Gardner 1993; Ackerman et al 2002), and little e...


... middle of paper ...


...ration mapping. Photogrammetry Engineering and Remote Sensing, 57, p.1163-1169.

Rossow, W.B., & Gardner, 1993. Cloud detection using satellite measurement of infrared and visible radiances for ISCCP. Journal of Climate, 6, p.2341 – 2369.

Saunders, R. W. & Kriebel, K. T., 1988. An improved method for detecting clear sky and cloudy radiances from AVHRR data. International Journal of Remote Sensing, 9, p.123 –150.

Saunders, R.W., 1986. An automated scheme for the removal of cloud contamination form AVHRR radiances over Western Europe. International Journal of Remote Sensing, 7, p.867 – 886.

Swain, P. H., & Davis, S. M., 1978. Remote Sensing: The Quantitative Approach. New York: McGraw-Hill.

Yhann, S. R. & Simpson, J. J., 1995. Application of neural networks to AVHRR cloud segmentation. IEEE Transactions on Geoscience and Remote Sensing, 33, p.590 – 604.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Essay on Is Cloud Seeding a Method to Help the Environment or Tear It Down

- ... According to, Casper Star Tribune, Wyoming has spent 8.8 million dollars in its fourth year with cloud seeding (screen 1). That means every year Wyoming spends 2.2 million dollars on just a single cause (cloud seeding). Just ask yourself is it really necessary. Secondly, if we continue to accept cloud seeding we’re making our planet more and more at risk. Yes, cloud seeding may help out with drought, but it also starts the risk of natural disasters. Drought and floods are natural aspects of the hydrologic cycle, so excess precipitation in one area tends to be balanced out by scant precipitation in another (cloud seeding, screen 1)....   [tags: silver iodide, chemicals, weather]

Free Essays
572 words (1.6 pages)

Intel Cloud Technology Program Essay

- Intel Cloud Technology Program Contents 1. Executive Summary…………………………………... 3 2. Introduction…………………………………………... 4 3. Overview of the program……………………………... a. Benefits…………………………………………….. 5 5 4. Competitors…………………………………………... 7 5. Conclusion……………………………......................... 7 6. References…………………………….......................... 8 Executive Summary A heterogeneous cloud infrastructure environment results in 40 to 60 percent performance variation. Therefore, cloud users are looking for more insight into the performance, capabilities and cost savings offered by cloud service providers so that they can get the right size and type of performance as per their parti...   [tags: customer, cloud users, cloud finder]

Term Papers
1077 words (3.1 pages)

Towards the Secure Storage of Images on Multi-Cloud System Essay

- Cloud computing has been defined as a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. But there is a risk of widespread data loss or downtime due to internet connectivity problems or a localized component failure in a cloud computing environment. In order to reduce the service availability risk or loss of data, a multi cloud system where data is replicated into multiple clouds offered by different cloud providers are used....   [tags: computing resources, cloud computing, convenient]

Term Papers
1190 words (3.4 pages)

How Cloud Computing Works Essay

- At first glance “The Cloud” appears to be magical but like a visit to “The Great and Powerful OZ’ when you look deeper you find that there is more to it behind the curtain. The cloud is not magic; it is actually a real delivery system with a structure that makes the whole thing work. Cloud computing is defined by the Investopedia online dictionary as a model for delivering data and software stored in servers that is retrieved from the internet through web-based tools and applications, rather than a direct connection to a server....   [tags: The Cloud]

Term Papers
1146 words (3.3 pages)

Cloud Computing and The Future Essay

- Cloud Computing and The Future Introduction Our future in computing is moving into a whole new direction called Cloud Computing. Many questions and issues have arisen from this new adventure in computing. For us to understand cloud computing we must first learn what it is. Once we have established that knowledge we can then venture out to the advantages and disadvantages, types of models, and finally services in cloud environments. We will see the correlation of information that leads into how cloud computing affects us today or in our near future....   [tags: cloud environment, renting, amazon]

Term Papers
973 words (2.8 pages)

The Global Cloud Computing Market Essay

- 1. Introduction Global cloud computing market is expected to grow rapidly due to its efficiency and innovativeness. This technology has been regarded as one of the top priorities for businesses to be efficient in terms of cost cutting, resource utilisation, employee communication, etc (Carcary, 2014). It is forecasted by Analyst group Forrester that the cloud computing market is predicted to increase from £22.5bn in 2011 to approximately £96.6bn by 2020. The definition of cloud computing from US National Institute of Standards and Technology (NIST) is one of the most widely and frequently known; “A model for enabling ubiquitous, convenient, on-demand network access to a shared pool of confi...   [tags: Cloud computing, Everything as a service]

Term Papers
1160 words (3.3 pages)

Evolutionary Algorithm and Cloud Computing Essay

- Evolutionary Algorithm and Discussions Cloud computing provides variety of internet on demand services such as software, infrastructure and data storage. for the purpose of provision of private service to the user, there is possibility to use multi-level password creation and documentation or authentication techniques. This technology assists in creating the password in several levels of the company. So, that the strict documentation and authorization is possible. The levels of security in cloud may be more developed by multi-levels documentation....   [tags: technology, cloud, storage]

Term Papers
970 words (2.8 pages)

Essay about Cloud Computing And The Cloud Storage

- Abstract - Cloud storage provides users to easily store their data and enjoy the cloud applications need not install in local hardware and software system. In cloud computing, data is moved to a remotely located cloud server. Many users place their data in the cloud and so data integrity is very important issue in cloud storage. In this paper a flexible distributed storage auditing mechanism, using the homomorphism token and distributed erasure coded data and it support to ensure the correctness and availability of users’ data in the cloud....   [tags: Cloud computing, Data management]

Term Papers
795 words (2.3 pages)

What is Cloud Computing? Essay

- Cloud Computing 1. Cloud Computing Defined Cloud computing is defined to be the use of computer programs and applications, to access information, storage, that is not stored locally on a computer’s hard drive, but rather over the Internet. There are five defining characteristics to cloud computing. Cloud computing allows users to have almost no interaction with the service provider. For example, when we use Google Drive, a web application similar to Microsoft Office, we can do so without ever having to contact the service provider, Google....   [tags: Cloud Computing Defined, Computer Programs]

Term Papers
1186 words (3.4 pages)

Cloud Computing Essay

- According to the National Institute of Standards and Technology (NIST), cloud computing is referred to as a model for enabling convenient, on-demand network access to a shared pool of configuration computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. The following paper will discuss the meaning of cloud computing, the major providers, benefits of adoption, pitfalls of adoption, current trends in the business community, and current application within the business community....   [tags: Cloud Services]

Term Papers
2148 words (6.1 pages)