4/3/2023 0 Comments The trove alternativesSome Sentinel-2B products are also available (since 2018), however for access to Sentinel satellite data, we recommend Sentinel Hub or Copernicus Hub. Some imagery is also available from SPOT, IKONOS, and OrbView 3. Landsat-8, the latest satellite in the mission, was launched in 2013, and is currently the second highest resolution available for free for optical data.Įarth Explorer also offers access to MODIS land data products from the NASA Terra and Aqua missions, and ASTER level-1B data products over the U.S. Landsat is a joint NASA/USGS program that provides the longest continuous space-based record of Earth’s land in existence. USGS Satellite imagery - Landsat, MODIS, and ASTER dataĮarth Explorer is a free in-browser platform to access Landsat satellite imagery. Ideal for: Researchers and scientists with limited budgets and a previous understanding of geospatial data. Even at 10m, the resolution is not sharp enough for many applications, such as car counting, construction monitoring, airplane tracking, etc. We recommend you use them.Ĭons: Only access to open data products. Disclaimer: SkyWatch is currently under contract by ESA for the maintenance of the SNAP toolbox and SNAP User Forums. Great forums and education resources to learn more about satellite data. Pros: One of the most popular datasets currently available and, with 5-day revisit rates, the closest people can get to free, real-time satellite imagery. It is also heavily used for interferometry (subsidence and ground motion measured at mm over time), maritime monitoring (ship detection, correlation with AIS to find dark targets, illegal fishing, and smuggling), as well as polarimetry (classify land cover, crop mapping, forest mapping, biomass, soil moisture). SAR stands for Synthetic Aperture Radar and is widely used in applications that require constant monitoring and detect change over time (especially since SAR can image day and night and through clouds). Through Sentinel Hub, users can also access Sentinel-1 data, currently the only free SAR (C-band) dataset. With two satellites circling the Earth, Sentinel-2 covers spans the entire globe and offers new images of an area every 5 days. Its 12 spectral bands range from coastal to SWIR bands. Sentinel-2 offers 10-meter resolution in red, green, blue and near-infrared, currently the best available resolution for free satellite imagery. Sentinel Hub also gives users access to Landsat and MODIS products. This also includes a trove of historical (archive) satellite images. Through Sentinel Hub, users can access all Sentinel products, as soon as they are made available. Sentinel Hub is one of the most used portals for accessing satellite data. Ideal for: hobbyists looking at pictures of different places in the world. Pros: free to use (for non-commercial applications), large library (entire world), no account needed, easily browsable, multiple resolutions available.Ĭons: recent images might not be available, not downloadable, different licenses and pricing for commercial applications. Most of the data on Google Earth was taken in the last 3-4 years. If you are curious to see images of our changing world, Google Timelapse is also a great free tool. Google Earth offers free access to some of the highest resolution satellite imagery, although the highest resolution images are actually taken from airplanes. Google Earth - Free access to high resolution imagery (satellite and aerial) If you are not familiar with Earth observation data, here is an example of the contrast between high resolution (commercial data, on the left) and low resolution (open data, on the right). Near real-time, high resolution satellite data that falls within open data programs is usually only available for humanitarian reasons (Maxar Open Data program offers free high resolution data to natural disaster recovery teams). Most of the satellite data available for free is either dated (from a couple of months to a couple of years, see Google Earth), or low resolution (you can detect rough building shapes but not cars or people). More explanations on live satellite imagery in this blog post: What does real-time satellite data look like. Some focus on open (free) satellite imagery, some focus on the highest resolution satellite imagery available for purchase.If you are wondering which providers has the most up-to-date satellite imagery, the highest resolution, or the largest library for open data, we have answers.īefore we start, if you were looking for real-time satellite images of your house, these most likely do not exist - Blame Hollywood for creating false expectations. Some platforms will let you view the data in your browser, some offer download options so you can process it and extract meaningful insights. There are many sources of satellite data you can use depending on your needs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |