GLOVIS

The USGS Global Visualization Viewer (GloVis) has been available since 2001 for the search and order of satellite and aerial data. The GUI of the GloVis provides user-friendly systems, especially for beginners, to catch the data. There is a vast range of satellite images such as Digital Orthophoto Quadrangle (DOQs), EO-1 ALI (Earth Observing-1 Advanced Land Imaging), EO-1 Hyperion (Earth Observing-1 Hyperion), Global Land Survey (GLS), Landsat 4-5 TM (L4-5 TM C1 Level-1), Landsat 7 ETM+ (L7 ETM+ C1 Level-1), Landsat 8 OLI/TIRS (L8 OLI/TIRS C1 Level-1), Sentinel-2, ISRO ResourceSAT 1 and 2 – AWIFS Sensor, ISRO ResourceSAT 1 and 2 – LISS-3 Sensor, GeoEye’s OrbView-3 (OrbView-3) available for download all around the world.

NASA Earth Observation (NEO)

Nasa has continuously collected data about Earth’s ocean, atmosphere, and land surface from 2006. This system provides the global level moderate resolution satellite imagery for a vast range of analysis. There more than 50 different global datasets that are represented with daily, weekly, and monthly snapshots. The images are available in several formats, such as JPEG, PNG, Google Earth, and GeoTIFF.

USGS Earth Explorer

USGS Earth Explorer can be considered as the best portal for the fetching of Remote sensing data for a variety of reasons. It has useful, user-friendly images such as criteria. In addition to that, data also download effectively, and users can freely visit the system and can get the most suitable images based on the requirements. Users can obtain Landsat satellite imagery, Radar data, UAS data, digital line graphs, digital elevation model data, aerial photos, Sentinel satellite data, some commercial satellite imagery including IKONOS and OrbView3, land cover data, digital map data from the National Map, and many other datasets. The searching capacity of the systems is very high, and users can select their AOI (area of interest) by providing latitude and longitude, typing the name of the location, drawing a polygon, or uploading KML or shapefile. The satellite images are available from 1975 to 2020 (at present).

ESA’s Sentinel data

This system provides completely free access to Sentinel-1, Sentinel-2, Sentinel-3, and Sentinel-5P user products, starting from the In-Orbit Commissioning Review (IOCR). Data are available from 2014 to up to date. Sentinel data can be used for several core subject areas such as Land monitoring, Emergency management, Security, and Climate change.

NASA Earth Data

This system is similar to NASA Reverb; Earth Data communicates with a plethora of satellites such as NASA DC, GPS satellites, SMAP, JASON, METEOSAT, ALOS, TRMM, Aura, Aqua, and much more. This system was developed in 2018 with a primary objective to facilitate searching and discovering NASA Earth observation data. The result can get faster for more relevant searches, especially for Earth Observing System Data and Information System (EOSDIS) data users.

NOAA Class

The Comprehensive Large Array-data Stewardship System (CLASS) is an electronic library of NOAA environmental data. This provides an on-line facility for the distribution of NOAA and US Department of Defense (DoD) Polar-orbiting Operational Environmental Satellite (POES) data, NOAA's Geostationary Operational Environmental Satellite (GOES) data, and derived data. This web site provides capabilities for finding and obtaining those data.

NOAA Digital Coast

This system helps the coastal community by providing the most-used resources in the coastal management community. Thus, NOVA Digital Coast is more popular among the coastal community, and they can effectively get more related data like free satellite imagery datasets such as infrared, radar and true color composite, land cover, elevation, socio-economic and benthic data. There are no effective systems to get specific coastal data as this system.

IPPMUS Terra

IPUMS Terra provides global-scale human population data, land use and land cover, climate, and other environmental characteristics. This framework provides a useful tool for integrating, analyzing, and visualizing a wide range of data with spatial and temporal aspects. The research communities can use this data to solve their specific research objectives. This system provides customized options to get country-specific data. This system currently focuses on five findings which are mentioned as follows:

• Census and survey microdata describing the characteristics of individuals and their families and households
• Aggregate census and survey data, describing the characteristics of places, including aggregate population characteristics, land use, and land cover
• Data derived from remote sensing describing land cover and other environmental characteristics
• Climate data describing temperature, precipitation, and other climate-related variables
• Vector-based geographic information system (GIS) data delineating administrative and census unit boundaries

These five types of data cover the temporal dimension and span multiple decades. These data can be used to investigate transformative changes in the human-environment system.