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  2. you have to move center of your image which is not georeferenced to the exact location, this is the movement problem and your question about pixels and cm, think about a resolution (100,100) with 2 different pixel sizes 1 - 1*1 cm2 2 - 1000*1000 cm2 do you think calculation in pixels is correct now?
  3. thanks very much. I have to search more to find calculations and equations but why the x,y of center of image is in cm?should not it be on pixels?On the other side I have the exact lat and lon of the center of image what about it?
  4. until
    INTRODUCTION Disaster risk information is spatial in nature and Geographic Information Systems (GIS) play an important role in disaster risk management. Rapid population growth and urbanization combined with extreme climatic events are causing a rapid increase in vulnerability of communities exposed to hazardous events. Natural disasters inflict severe damage on almost the entire spectrum of social and natural habitats, ranging from housing and shelter, water, food, health, sanitation, and waste management to information and communication networks, supply of power and energy, and transportation infrastructure. There is a great need to utilize disaster risk information in planning for effective coping mechanisms of disaster risk reduction. For this, there is a significant need to create awareness among the disaster management professionals regarding the importance of GIS and Remote Sensing. This course is job oriented and aims to impact practical skills on how to use GIS and RS ,to overcome the major challenges faced in ,pre-disasters during disaster and post-disaster management such as during early warning, hazard, vulnerability and risk assessment, damage assessment, as well as in the design of risk reduction measures. DURATION 5 Days TARGETED AUDIENCE The course is targeted at professionals who require knowledge and skills on the use of GIS and RS in their organization in the field of disaster management. Participants are welcome from a broad range of organizations including physical planning, institutions, professionals and private GIS and RS related firms. LEARNING OBJECTIVES Upon completion of the course, the participants will be able to: Describe and utilize spatial data, GIS and remote sensing in disaster risk assessment and management Utilize existing sources of historical disaster information and elements at risk data Apply GIS/remote sensing in hazard, vulnerability and risk assessment Employ risk information in emergency preparedness planning Visualize hazard and risk information Apply GIS/remote sensing to post-disaster damage assessment
  5. I don't have any documents, unfortunately. convert your image into an array. find the x y of the center of the image for example (10 cm, 12 cm) convert them to degrees dx = Long - Xdeg dy = Lat - Ydeg A = move all the cells with this dx and dy B = rotate A (flight azimuth) C = scale B based on flight height and .. (i'm not sure about dz)
  6. Yesterday
  7. Thanks, Can you please share some documents of using those parameters to georefrence?and also please explain a bit more about delta x, y and z...Why I need them?
  8. As far as I know, yes you can you have image size, camera elevation, camera focus length, so you can solve Scale problem, you have flight azimuth, so you can solve Rotation problem if you have delta X, delta Y and delta Z, so you can solve Movement problem.
  9. Hi,If we consider those information as what you have suggested Can I georefrence it using those data?or it is not possible?
  10. I dont know about that. But there is another angle on the top right of the image. I dont remember these courses but my guess is information on top are about flight and on the bottom are about camera settings!!
  11. Hi Yousef, Yes It is the elevation of camera is 1111.1 meters but I am not sure about azimuth. could it be the angle of horizontal image?
  12. Italian Journal of Science & Engineering Call for Papers for the 1st Issue (2016): Italian Journal of Science & Engineering We would like to invite you to submit your original work for consideration and possible publication in our research based scientific journal. Italian Journal of Science & Engineering (IJSE) is a multidisciplinary, an open-access, internationally double-blind peer-reviewed journal that is publishing 6 issues per volume (bio-monthly). Italian Journal of Science & Engineering providing a platform for the researchers, academicians, professionals and students to impart and share knowledge in the form of high quality empirical and theoretical research articles, review articles and technical note. The IJSE covers the following main subjects: Social and Management Sciences: Anthropology, Communication studies, Economics, Accounting & Finance, Education, Geography, History, Law, Linguistics, Political science, Psychology, Social health, Sociology, Visual and Performing Arts, Humanities and other relevant subjects. Engineering and Technical Sciences: Chemical engineering , Civil engineering , Electrical engineering , Mechanical engineering, Manufacturing engineering, Acoustical engineering, Mining engineering, Instrumentation and control, Aerospace, Automotive, Computer, Electronic, Petroleum, software, Architectural, Agricultural, Biosystems, Biomedical and industrial materials and other relevant subjects. Natural Sciences: Biology, Chemistry, Food chemistry and Biochemistry, Ecology, Agriculture and environment and other relevant topics Formal Sciences: Logic, Mathematics, Mathematical logic, Mathematical statistics, Theoretical computer science. Physical Sciences: Chemistry, Physics, Earth sciences and Space science. IJSE has fast peer review process (3-4 weeks). IJSE is published six month a year (bi-monthly). http://ijournalse.org/index.php/IJSE/index
  13. Hi, Pixel size will solve the problem of scale, How about the rotation problem? Is that Azimuth angle? It seems like an imagery from a water body with an elevation near to zero. do you have the elevation of the camera (1114.1 meters?)? and size of the image? is it tilted?
  14. Dear rahmansunbeam, Thanks for your answer, you know the only data that I have are as this image. I think I can not find 4 points as I dont have any other benchmarks except what is in center of the image. I think If I can find pixel size on earth I can find other points but the rotation is the case here. https://ibb.co/ehscRQ The image that I have is uploaded in above link. Can you please take a look at it and give me some suggestions?thanks
  15. You have to identify 4 more points from the xy location. Just set a fixed euclidean distance from that point and draw four other point who have same distance from their neighbors. The distance should not exceed the image size. Than let the program identify their xy locations. More ideas are here - Georeferencing aerial photos when only centroid is known using ArcGIS for Desktop or ERDAS Imagine? I think you cannot do it with elevation.
  16. Hi, look at these videos which are for landsat 8 https://www.youtube.com/user/SuperLaser1979/videos
  17. I have faced a problem, I have an aerial image, I have its elevation and x,y of its center, I know we need to have at least 3 point to georeference an image using afine calculations, Is there any way to do it by elevation and one point? I am thinking if I can find pixel size on land I can calculate two other points manually based on central pixels location, is it possible/? I want to do it using gdal and c#. I just need the methodology and to know if it is possible to do this using these data or not.
  18. Last week
  19. Georgeina, what software do you have access to? Do you have access to a USGS EarthExplorer account? You can order your products in bulk using the USGS ESPA interface (https://espa.cr.usgs.gov/login). You can place an order up to 5000 scenes for L4/5, L7, and L8. The available products include surface reflectance and several different indices (e.g., NDVI, EVI, SAVI, etc.), including a cloud/shadow mask for masking NULL values. https://landsat.usgs.gov/sites/default/files/documents/espa_odi_userguide.pdf
  20. it seems it is because of webgl or sth like that.
  21. amazing dude, sad becouse , only for crome support not for other browser , regards
  22. Question: Where can I find and donwload free SPOT satelite images ? I have read a year ago that the SPOT1-4 archive will be free, similar to Landsat archive. What is the status for SPOT images ? Download links for SPOT ?
  23. Ok dear am 2 Many thanks Any videos to follow the tutorial as a beginner? Warm regards
  24. until
    INTRODUCTION The main purpose of the course is to enhance the capabilities of technical staff involved in Food Security Analysis, climate analysis and agriculture by providing them with an understanding on the use of spatial and Earth Observation (EO) information as a tool to integrate knowledge about climate change, agriculture, and food security in a meaningful and innovative way. DURATION 5 Days COURSE OBJECTIVES By completing this course, participants will be able to: Understand the basic concepts of GIS and Remote Sensing Understand concepts and main frameworks in Food Security Analysis Understand concepts and main frameworks in Climate Change Analysis Understand concepts and main frameworks in Agriculture Understand the relationship between climate change, agriculture and food security Apply GIS and Remote Sensing as Decision support tool for Climate Change, Agriculture and Food Security (CCAFS). Use GIS information in planning FS interventions through spatial multi-criteria analysis Assess spatial data availability and understand the importance of spatial data infrastructure (SDI), for data sharing by organizations involved in CCAFS Apply GIS and RS for designing implementations of large scale early warning systems Use participatory GIS (PGIS) tools during assessments at community level Apply remote sensing data and image processing techniques to monitor select CCAFS indicators Use mobile phones to gather data during field assessments/surveys Design and implement their own GIS projects that integrate remote sensing data and GPS-based field information
  25. at first radiometric calibration using DN->radiance then atmospheric calibration using ATCOR,MODTRAN, FLAASH OR quick (some of them are methods some are tools) at the end calculate ndvi,your metadata is used in atmospheric and radiometric calibration .
  26. wow,just look at this link https://earth.google.com/web/ here is a screen shot I can not wait to find a API to use it. It seems very intresting, a good 3d and 2d combination
  27. until
    Epidemiology seeks to determine associations between exposure risk and disease that are spatially dependent. Public health focuses on the health of populations rather than of individuals and focuses more on prevention of health problems. These efforts fall naturally within the domain of problems requiring use of spatial analysis as part of the solution, and GIS and other spatial analysis tools are therefore recognized as providing potentially transformational capabilities for Epidemiology and public health efforts. Statistics are a mainstay in the toolkit of public health professionals. Human memory being what it is, however, even Public health professionals with reasonable statistical training, over the years, often forget the basics. If professionals are going to make sensible use of consultants, communicate effectively with funders, and understand others’ reports, then they often need at least a conceptual understanding of relatively complex, recently developed statistical techniques. This course are: to link common public health questions with appropriate statistical procedures; to offer a strong conceptual grounding in several important statistical procedures; and to describe how to interpret the results from the statistics in ways that are principled and will be persuasive to intended audiences using simple software tools. Participants will acquire hands-on skills in use of Geographic Information System (GIS) as a tool to capture, store, analyze, manage, and visualize disease cases data that is geographically linked. The participants will also acquire statistical data analysis skills. WHO SHOULD ATTEND? The course is targeted at individuals working with health data that have no experience using GIS but would like to learn how it can be applied in their work. COURSE OBJECTIVES To develop Understanding on the different components of a GIS and the role GIS plays in solving epidemiological and public health problems. To present to participants all data-related aspects of a GIS, such as the data models in GIS, data input, data editing, data visualization, metadata and managing a spatial database. To Carry out advanced analyses of geographical data with specific reference to epidemiological related issues To improve data management and analysis skills of the participants To perform spatial and temporal epidemiological and public health analysis using GIS. Establish understanding on how to work with spatial data and GIS techniques to solve epidemiology and public health problems. To expose participants to data capture, input, manipulation and display by GIS To demonstrate to participants use of GIS in mapping health facilities and projects. To explain to the participants role of GIS as a decision support system in public health
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