Most vital part of any GIS and Remote Sensing work is satellite data. Buying a satellite image for research purpose is quite expensive. However there are many online resources those provide data for this purpose free of cost. All that you may need is to credit them for using data from their archive.
earthexplorer: Is a place where you will find satellite images, DEM and many other related data for any area around the globe. You get data right from 1972. You get data from various sensors like LANDSAT series, ASTER, SRTM etc. This is an amazing service provided by NASA. Do remember to credit NASA in your research work.
bhuvan: If you are from India, you would consider NRSC (National Remote Sensing Centre) data first. It is also observed that, bhuvan data scores better than earthexplorer for Indian region. You get data primarily from LISS and CAROSAT. But note that you get data only for Indian subcontinent. Also to mention that data is available after 1990s.
Following is the tutorial illustrating the procedure to download satellite Images and DEM for free.
Notes and Tips:
- You will need to register to both sites as a user first in order to download data.
- Your any query related to NASA products can directly be sent to the mail ID provided. You can expect an early and prompt reply (personal experience)
- Both in earthexplorer and bhuvan, do explore all the options for all available data, you will get many more data products that would be useful for your work. So just do not log out once you get the data, you are looking for, explore more.
- Download natural look like data before downloading the image to check for quality of image. Primarily to have a look at the cloud condition.
No comments:
Post a Comment