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After signing in, filters can be adjusted to isolate specific datasets. For InSAR analysis, Sentinel 1 (A or B) SLC datasets are required. Selecting data with short temporal ranges (6 day) is appropriate hazard assessments or rapid land cover changes. Sentinel 2 measures with a multispectral sensor and is a good supplement to any analysis done with the Sentinel 1 imagery. If desired, a cloud cover threshold can be selected to limit the product search to imagery that is below a certain percentage of cloud cover. This is an especially useful parameter to specify when looking for imagery in tropical regions where cloud coverage is often a problem in sensors which imager along regions of the electromagnetic spectrum that have short wavelengths (i.e. visible and infrared). | After signing in, filters can be adjusted to isolate specific datasets. For InSAR analysis, Sentinel 1 (A or B) SLC datasets are required. Selecting data with short temporal ranges (6 day) is appropriate hazard assessments or rapid land cover changes. Sentinel 2 measures with a multispectral sensor and is a good supplement to any analysis done with the Sentinel 1 imagery. If desired, a cloud cover threshold can be selected to limit the product search to imagery that is below a certain percentage of cloud cover. This is an especially useful parameter to specify when looking for imagery in tropical regions where cloud coverage is often a problem in sensors which imager along regions of the electromagnetic spectrum that have short wavelengths (i.e. visible and infrared). | ||
== '''Earth Explorer (USGS)''' == | == '''[https://earthexplorer.usgs.gov/ Earth Explorer (USGS)]''' == | ||
There are numerous additional data sets available than the ones listed within the data search catalog however, the ones listed in the search catalog are the most useful in terms of general analysis. Many data sets available through Earth Explorer are specific to one project, usually based on an area in North America and are projected in the datums of North America (i.e. NAD83). The data types within the attached catalog document mostly apply to a global range and are projected in global datums such as WGS84 or UTM. | There are numerous additional data sets available than the ones listed within the data search catalog however, the ones listed in the search catalog are the most useful in terms of general analysis. Many data sets available through Earth Explorer are specific to one project, usually based on an area in North America and are projected in the datums of North America (i.e. NAD83). The data types within the attached catalog document mostly apply to a global range and are projected in global datums such as WGS84 or UTM. | ||
To quickly assess if the data set is right for your project, coverage shapefiles can be quickly downloaded. Most of the data sets on the EarthExplorer search engine have global coverage shapefiles which can easily be viewed through Google Earth. Links to these files can be accessed by clicking the information icon next to the data set ID, this will redirect you to a general information page on the instrument and data. At the bottom of these pages there are usually the links to the coverage shapefiles. | To quickly assess if the data set is right for your project, coverage shapefiles can be quickly downloaded. Most of the data sets on the EarthExplorer search engine have global coverage shapefiles which can easily be viewed through Google Earth. Links to these files can be accessed by clicking the information icon next to the data set ID, this will redirect you to a general information page on the instrument and data. At the bottom of these pages there are usually the links to the coverage shapefiles. | ||
== '''Earth Data (NASA and USGS)''' == | == '''Earth Data (NASA and USGS)''' == |