When selecting a dataset from Timeviews, one might wonder what are the properties of each dataset. These data about other data is called metadata.
In this article, we will define what each metadatum refers to, depending on the provider:
To acquire the metadata of each dataset, simply create a Timeline and before choosing the dataset, hover your mouse over one and click on the three horizontal line icon beside it:
Depending on which dataset provider is picked and the data availability, the metadata displayed may differ.
Metadata of an Airbus dataset (left); metadata of a Maxar dataset (right)
Airbus
Here are the definitions of the metadatum that can be found in an Airbus dataset:
|
METADATA |
DEFINITION |
|
Acquisition date |
The date and time the imagery was acquired |
|
Azimuth Angle |
The angle measured from the sub-satellite point (point on the ground below the platform) between the scene center and true north. Measured clockwise from north in degrees (0-360) |
|
Cloud Cover |
Correspond to the average cloud coverage of an image, 0 meaning that the image is cloud free and 100 that the image is totally cloudy |
|
Constellation |
Name of the constellation, in the case of OneAtlas Data this value could be equal to SPOT of PHR |
|
Format |
This is the requested image format |
|
Id |
Unique identifier of the image in the catalog |
|
Illumination Azimuth Angle |
From the scene center point on the ground, this is the angle between truth north and the sun. Measured clockwise in degrees (0-360) |
|
Illumination Elevation Angle |
The angle from the tangent of the scene center point to the sun. Measured from the horizon in degrees (0-90) |
|
Incidence Angle |
The angle from the target point of view. It represents the angle between the ground normal and look direction from the satellite, combining the pitch and roll angles. |
|
Incidence Angle Across Track |
Incidence in the OrthoScan axis direction |
|
Incidence Angle Along Track |
Incidence in the Scan axis direction (image line axis on the ground) |
|
Last Update Date |
The date the acquisition record was modified in an ISO-8601-formatted string |
|
Organisation Name |
Name of the company that owns the copyrights to the imagery |
|
Parent Identifier |
Corresponds to the Datastrip identifier, a datastrip being a portion of image downlinked during a pass of the satellite to a given ground station |
|
Platform |
The name of the satellite used to collect the image |
|
Processing Level |
This value could be equal to SENSOR (images which meet Living Library criteria) and ALBUM (images that do not meet Living Library criteria in terms of Incidence angle and Cloud cover. |
|
Product Category |
The category of the product (usually image) |
|
Product Type |
Spectral Band Combinations like Panchromatic, Multispectral, or Bundle |
|
Publication Date |
The date and time when the data was published in the online archive |
|
Resolution |
This corresponds to the satellite used. 0.5 for Pleiades and 1.5 for SPOT. |
|
Sensor Type |
Type of sensor used to capture the imagery |
|
Spectral Range |
The range of the spectrum the captured imagery is in |
Maxar
Here are the definitions of the metadatum that can be found in a Maxar dataset:
|
METADATA |
DEFINITION |
|
Acquisition Date |
The date and time the imagery was acquired |
|
Feature Id |
A string that uniquely identifies the particular Feature to be included or excluded from returned results. |
|
Source |
The sensor used to collect the imagery used to make the product described by the Feature. |
|
Source Unit |
The type of product described by the Feature. |
|
Product Type |
The product type depending on the available Spectral Band Combinations |
|
CE90 Accuracy |
The geographic accuracy of the product described by the Feature, in Meters, as a CE90 value. CE90, Circular Error of 90%, is commonly used for quoting and validating geodetic image registration accuracy. |
|
RMSE Accuracy |
The geographic accuracy of the product described by the Feature, in Meters, as a 2d RMS Error value. RMSE, Root Mean Squared Error, is commonly used for quoting and validating geodetic image registration accuracy. |
|
Cloud Cover |
The percentage of the AOI intersection area covered by clouds |
|
Off Nadir Angle |
The maximum off-nadir angle of the full image strip. |
|
Sun Elevation |
The angle from the tangent of the scene center point to the sun. Measured from the horizon in degrees (0-90). |
|
Sun Azimuth |
From the scene center point on the ground, this is the angle between true north and the sun. Measured clockwise in degrees (0-360). |
|
Ground Sample Distance |
The distance between two consecutive pixel centers measured on the ground |
|
Ground Sample Distance Unit |
Unit of the ground sample distance |
|
Ingest Date |
The date and time when the data was made available in the online archive |
|
Copyright |
Contains the copyright information for the imagery |
With all the abundant data available, pick the preferred dataset to create a Timeline and observe how a project progressed through time. Find more information about creating a Timeline here.
We hope that you have found this article on for Airbus/Maxar metadata for Timeviews, helpful. Feel free to contact us at support@plexscape.com for any questions you may still have.
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