I am looking for satellite imagery of last 10 years so that i can find out change detection in such place. The possible solution to download the historical solution is by using google earth pro but due to the contrast problem in such imagery it become very difficult for me to classify it and another solution i have found was Declassified imagery in earth explorer but all those images were taken in range of 1970's and another landsat but due to the coarse resolution i find it is also unsuitable for this project, santinel-2 contains the datasets only after 2015. What may be the possible solution for this probelem ? Please tell me if you have any idea , i will apreciate your help
You can use multi temporal MODIS NDVI data for land cover change detection.
Luc Kulimushi
Yurii Moskalenko i appreciate your help but i still confuse about which satellite imagery or product of it which one is availabke to gee is the best for my project .
Luc Cimusa Kulimushi sir i tried it but found the resolution is too coarse .. if you have any idea on its alternatives then let me know
https://ngmdb.usgs.gov/topoview/viewer/#
Many of the maps feature aerial imagery
You can't expect good resolution satellite images for free of cost. Landsats and sentinels are the most popular free images used by several studies at different scales regardless their coarse resolutions. I advise you to apply one the proposed satellite images (landsat, sentinel or Modis ndvi) then you mention uncertainties in your project and this is scientifically accepted.
Hello Yogesh! You didn't write what is your area of interest (entire world? Americas? Europe? Asia...?). One of the best places (except Earth Explorer) is Copernicus Acces Hub (https://scihub.copernicus.eu/dhus/#/home). places
Bartłomiej Szypuła Sir appreciate for your valuable time, i want to analyze the deforestation and builtup pattern in chure hill its in Asia or specifically in country nepal. Yahh, it is possible to access the sentinel-2 imagery from this site but i had already tried this imagery, although the imagery has best spatial and temporal resolution and possible to fill up the clouds in imagery, such dataset is available only after 2015 but i require the dataset from 2011 so i find it not much useful for my project. If you have any alternatives then let me know about it
Luc Cimusa Kulimushi okey sir i will try to prepare best product from available datasets . Thanks a lot for your help
It is possible to check https://livingatlas.arcgis.com/wayback, a living atlas from Esri
Yogesh Regmi Since the first Landsat was launched there has been continual land cover change monitoring studies, including deforestation, bridging over continual improvements in sensor resolution and spectral capabilities - probably the most notable is the Global Land Analysis and Discovery (GLAD) laboratory in the Department of Geographical Sciences at the University of Maryland ( https://glad.umd.edu/projects and https://glad.umd.edu/projects/research-mapping-forest-cover-change-three-tropical-countries ). Similarly, the ESA is also supporting a number of projects.
If you are detecting change ( land cover transitions from one type to another ), you do not need identical scene characteristics across a time series - sometimes all that is needed is some overlap so some transitions are present in part of both series. And increased resolution is not necessarily a good thing, especially in highly convoluted mountainous terrain, if basically makes the scene noisier and presents exponentially more localized variations that have to be dealt with in classification - especially if the DEM used for terrain correction is far coarser than the data. The same applies if you mosaic the scenes.
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