# Metadata

**Metadata** is the term used to describe all the ancillary information about an image that might be important to the user.

This page captures all the metadata items that are present in ICEYE imagery. You can use the search bar at the top from any page and enter the metadata element you are interested in and it will find it on this page.

## ICEYE Product Metadata (Version 2.4)

Format Metadata Elements | Description | Type | Unit | Example | HDF5 | SLC-XML | GEOTIF | AMP-XML |
---|---|---|---|---|---|---|---|---|

`acquisition_end_utc` |
UTC time for when the last pulse of the scene was sent | ASCII | UTC time | 2019-03-10T18:20:00.307546 | ||||

`acquisition_id` |
Identitification number for this acquisition | ASCII | int | 469840 | ||||

`acquisition_mode` |
Acquisition mode used | ASCII | text | Stripmap, Spotlight | ||||

`acquisition_prf` |
Pulse Repetition Frequency used for the acquisition | float64 | Hz | 4823.00342969132 | ||||

`acquisition_start_utc` |
UTC time for when the first pulse of the scene was sent | ASCII | UTC time | 2019-03-10T18:19:50.316054 | ||||

`angX` |
X-component of the antenna pointing orientation | vector of float64 | TBP | |||||

`angY` |
Y-component of the antenna pointing orientation | vector of float64 | TBP | |||||

`angZ` |
Z-component of the antenna pointing orientation | vector of float64 | TBP | |||||

`ant_elev_corr_flag` |
Flag indicating if antenna elevation pattern compensation was applied | int64 | flag | 1 | ||||

`antenna_pattern_compensation` |
Amplification factor applied for antenna pattern compensation (for each range sample) | vector of float | numbers | [1.8106, 1.8103...1.0956,1.0957] | ||||

`AREA_OR_POINT` |
geotif flag indicating if this is an area collection or a point collection | ASCII | text | Area' or 'Point' | ||||

`avg_scene_height` |
Average elevation over ellipsoid (calculated using SRTM or other low resolution global DEM) | float32 | meters | 661 | ||||

`azimuth_ground_spacing` |
Azimuth sample spacing in meters with the average ground projected velocity | float64 | meters | 1.44733 | ||||

`azimuth_spacing` |
Azimuth sample spacing in meters with the average ground projected velocity | float64 | meters | 1.44733 | ||||

`azimuth_look_bandwidth` |
Bandwidth of each look in range (only for GRD products) | float64 | Hz | 1157.2 | ||||

`azimuth_look_overlap` |
Overlap of adjacent looks in azimuth (only for GRD products) | float64 | Hz | 289.3 | ||||

`azimuth_looks` |
Looks in azimuth direction (for SLC products it is 1) | int64 | number | 3 | ||||

`azimuth_resolution` |
3dB resolution of this data product | float64 | meters | 2.49 | ||||

`azimuth_time_interval` |
Time interval between azimuth samples in the SLC product. (=1/processing_prf) | float64 | seconds | 0.0002073 | ||||

`calibration_factor` |
Factor to be applied to calibrate detected products to absolute brightness intensity | float64 | number | 1.2341123e-05 | ||||

`carrier_frequency` |
Carrier frequency of the radar system, static parameter | float64 | Hz | 9650000000 | ||||

`chirp_bandwidth` |
Bandwidth used for radar pulse (defines achievable radar range resolution) | float64 | Hz | 134000000 | ||||

`chirp_duration` |
Duration of chirp | float64 | seconds | 4.1473e-05 | ||||

`coord_center` |
Centre coordinate [x(col), y(row),lat,lon] | [int32,int32, float64, float64] | coordinates | [8440,22139,34.86704,-117.99988] | ||||

`coord_first_far` |
First azimuth row far range coordinate. [x(col), y(row),lat,lon] | [int32,int32, float64, float64] | coordinates | [16878,1,35.17738,-118,11233] | ||||

`coord_first_near` |
First azimuth row near range coordinate. [x(col), y(row),lat,lon] | [int32,int32, float64, float64] | coordinates | [1,1,35.12016,-117.74549] | ||||

`coord_last_far` |
Last azimuth row far range coordinate. [x(col), y(row),lat,lon] | [int32,int32, float64, float64] | coordinates | [16878,44298,34.61222,-118.24414] | ||||

`coord_last_near` |
Last azimuth row near range coordinate. [x(col), y(row),lat,lon] | [int32,int32, float64, float64] | coordinates | [1,44298,34.55509,-117.88013] | ||||

`data_orientation` |
Can be either "native" or "shadows_down". This describes the data inside the product storage arrays. 'native' means columns are for increasing range and increasing rows are slow time. ''shadows-down' means increasing rows are increasing range and columns represent slow-time direction | ASCII | text | "native" | ||||

`dc_estimate_coeffs` |
Doppler centroid coefficient as a 2D array, size MxN, where M is the number of DC estimates, and N is the (DC polynomial order+1) | 2D array of float64, size MxN | number | [[5.417583e+03, 1.130813e+07, -8.125472e+09,7.947223e+12], ... [5.417583e+03, 1.130813e+07, -8.125472e+09,7.947223e+12]] | ||||

`dc_estimate_poly_order` |
Order of polynomial describing one doppler centroid estimate | int64 | number | 3 | ||||

`dc_estimate_time_utc` |
Timestamp for each doppler centroid estimate | ASCII list | Time (UTC) | ['2019-03-10T18:19:51.775477'],['2019-03-10T18:19:52.775477'],['2019-03-10T18:19:53.775477'],['2019-03-10T18:19:54.775477']] | ||||

`Doppler_Centroid_Coefficients` |
XML Block of data containing |
Coefficient Block | Hz | |||||

`Doppler_Rate` |
See Doppler Rate Coefficients Schema | Coefficient Block | ||||||

`doppler_rate_coeffs` |
Coefficients of doppler rate polynomial as a function of range time. Stored as a vector with size corresponding to the order of the doppler rate polynomial | vector of float64 | number | [5.124592968269841e+03; -1.153864338674892e+06; 2.582540352459471e+08; -5.572042961000484e+10] | ||||

`doppler_rate_poly_order` |
Order of polynomial describing doppler rate range dependence | int64 | number | 3 | ||||

`first_pixel_time` |
Two-way slant range time origin, corresponding to the near range (1st range sample) | float64 | seconds | 0.004398670017444 | ||||

`fsl_compensation` |
Amplification factor applied for free space loss compensation (for each range sample) | vector of float64 | numbers | [1.0457, 1.0457...1.0841,1.0841] | ||||

`gcp_terrain_model` |
Options are WGS84 for Ellipsoid, EGM96 for GEOID, DEM for DEM based | ASCII | text | |||||

`geo_ref_system` |
Geographic reference frame indicator for scene coordinates and orbit state vectors | ASCII | text | WGS84 | ||||

`grd_amplitude` |
Amplitude array (only for GRD products). Sigma-nought conversion factor of sin(inc_angle) applied. | as ‘sample_precision’ | number array | |||||

`grsr_coefficients` |
ground range to slant range polynomial coefficients (only for GRD product) | vector of float64 | number | [6.467483312430216e+05; 0.47388031307797884; 6.685331046296479e-07; -4.928145432555108e-13; 5.0525558404285224e-20] | ||||

`GRSR_Coefficients` |
See GRSR_Coefficients schema | Coefficient Block | ||||||

`grsr_ground_range_origin` |
ground range origin for GRSR conversion | number | 0 | |||||

`grsr_poly_order` |
Order of polynomial describing ground range to slant range projection dependence (only for GRD product) | int64 | number | 4 | ||||

`grsr_zero_doppler_time` |
ground range origin zero Doppler time | ASCII | UTC time | 2019-04-08T14:50:13.120113 | ||||

`height_spline` |
Python numpy spline parameters for surface height used to focus image | hickle | meters | |||||

`heading` |
Satellite heading at centre of imaging operation | float64 | degrees | |||||

`incidence_angle_coefficients` |
coefficients of the polynomial for calculating the incidence angle dependence in range | vector of float64 | number | [ 2.67986035e+01; 8.66207416e-05; -5.61940883e-11; -1.73946139e-17; 8.22003978e-23] | ||||

`Incidence_Angle_Coefficients` |
See Incidence_Angle_Coefficients XML Block Schema | Coefficient Block | number | |||||

`incidence_angle_ground_range_origin` |
incidence angle origin in ground range, for calculating incidence angle dependence in range | float64 | number | 0 | ||||

`incidence_angle_poly_order` |
order of the polynomial for calculating the incidence angle dependence in range | int64 | number | 4 | ||||

`incidence_angle_zero_doppler_time` |
incidence angle origin zero Doppler time | ASCII | UTC time | 2019-04-08T14:50:13.120113 | ||||

`incidence_center` |
incidence angle in ground at middle range | float64 | degrees | 23.5 | ||||

`incidence_far` |
incidence angle in ground at far range | float64 | degrees | |||||

`incidence_near` |
incidence angle in ground at near range | float64 | degrees | |||||

`lat_spline` |
Python numpy spline parameters for image pixel latitudes | hickle | degrees | |||||

`local_incidence_angle` |
Array of values describing the local incidence angle or each range sample in the scene | []float64 | degrees | |||||

`look_side` |
Look side of the acquisition, only 2 options LEFT or RIGHT | ASCII | text | LEFT | ||||

`lon_spline` |
Python numpy spline parameters for image pixel longitudes | hickle | degrees | |||||

`mean_earth_radius` |
mean WGS84 ellipsoid radius over scene | float64 | meters | 6371346.049 | ||||

`mean_orbit_altitude` |
mean sensor altitude above WGS84 ellipsoid | float64 | meters | 595177.494 | ||||

`number_of_azimuth_samples` |
Number of azimuth samples (number of rows in binary data) | int64 | number | 44298 | ||||

`number_of_dc_estimations` |
Number of doppler centroid estimates | int64 | number | 9 | ||||

`number_of_range_samples` |
Number of range samples (number of columns in binary data) | int64 | number | 16878 | ||||

`number_of_state_vectors` |
Total number of orbit state vectors provided for the scene | int64 | number | 120 | ||||

`orbit_absolute_number` |
Absolute number of orbits since launch | int64 | number | 1447 | ||||

`orbit_direction` |
Specifies whether the orbit is in ascending or descending node at the time of acquisition | ASCII | text | ASCENDING or DESCENDING | ||||

`orbit_processing_level` |
PREDICTED (based on orbit propagation model ) RAPID (uses onboard GPS data ) PRECISE (corrections applied after GPS data received in ground using high precision orbit propagator (eg ODTK) SCIENTIFIC (Uses precise ground-based measurements together with all above to post-fix orbit to best possible) | ASCII | Text | |||||

`orbit_relative_number` |
Relative number of orbit within the repeat cycle | int64 | number | 1447 | ||||

`orbit_repeat_cycle` |
Ground track repeat cycle (to be included) | int64 | number | 99999 | ||||

`Orbit_State_Vectors` |
See Orbit_State_Vectors XML Schema | Coefficient Block | ||||||

`pitch` |
Pitch angle of the satellite attitude | float | degrees | 11.5 | ||||

`polarization` |
Transmit and receive polarizations used | ASCII | text | VV | ||||

`posX` |
X-component of state vector position, for each state vector | vector of float64 | meters | [-2401162517… -2456350660] | ||||

`posY` |
Y-component of state vector position, for each state vector | vector of float64 | meters | [-5201254993… -5253761907] | ||||

`posZ` |
Z-component of state vector position, for each state vector | vector of float64 | meters | [3963994744… 3859728760] | ||||

`processing_prf` |
Pulse Repetition Frequency used for the processing, defines azimuth sample spacing in time (can be higher than acquisition in cases where the Doppler frequency needs to be unfolded due to high variation of Doppler centroid with range) | float64 | Hz | 9646.00685938265 | ||||

`processing_time` |
Timestamp provided by the SAR processor saying when the image for processed | ASCII | UTC Time | 2020-05-27T05:01:49 | ||||

`processor_version` |
Version number of the processor used to generate the product | float64 | number | (internal version numbering) | ||||

`product_level` |
Processing level | ASCII | text | SLC, GRD | ||||

`product_file` |
File name of this product | ASCII | text | ICEYE_X2_SLC_SM_16519_20200102T155349.h5 | ||||

`product_name` |
ICEYE_datasetID_eventID_(YYYYMMDD)T(HHMMSS) | ASCII | Text | ICEYE_2457_123123_20191201T056721 | ||||

`product_type` |
Product type (if we have product names for different imaging modes) | ASCII | text | Stripmap, StripmapHigh, Spotlight, SpotlightHigh | ||||

`range_look_bandwidth` |
Bandwidth of each look in range (only for GRD products) | float64 | Hz | 53600000 | ||||

`range_look_overlap` |
Overlap of adjacent looks in range (only for GRD products) | float64 | Hz | 13400000 | ||||

`range_looks` |
Looks in range direction (for SLC products it is 1) | int64 | number | 3 | ||||

`range_resolution_center` |
Scene centre range resolution | float64 | meters | 2.15 | ||||

`range_resolution_far` |
Range resolution at the far edge of the image | float64 | meters | 1.93 | ||||

`range_resolution_near` |
range resolution at the near edge of the image | float64 | meters | 2.49 | ||||

`range_sampling_rate` |
Sampling rate used for digital sampling, defines range sample spacing in time | float64 | Hz | 157500000 | ||||

`range_spacing` |
||||||||

`range_spread_comp_flag` |
Flag indicating if free space loss compensation was applied | int64 | flag | 1 | ||||

`ref_track_point_ecef` |
reference point for image in earth centred earth fixed coordinate frame | []float64 | m | array | ||||

`ref_track_point_lla` |
reference poInt for image in terms of latitude, longitude and altitude | []float64 | deg,deg,m | array | ||||

`RPC` |
RPC according to http://geotiff.maptools.org/rpc_prop.html | Coefficient Block | ||||||

`s_i` |
Real part of the SLC complex array (only for SLC products) | as ‘sample_precision’ | number array | |||||

`s_q` |
Imaginary part of the SLC complex array (only for SLC products) | as ‘sample_precision’ | number array | |||||

`sample_precision` |
Precision used for binary data samples | ASCII | text | float32, int16 | ||||

`satellite_look_angle` |
Satellite look angle | float64 | degrees | 23.5 | ||||

`satellite_name` |
Name of the satellite | ASCII | text | ICEYE-X2, ICEYE-X4... | ||||

`scan_beams` |
Provides information Scan beams used in Scan mode (SCAN MODE ONLY) | Struct | ||||||

`slant_range_spacing` |
Spacing between two consecutive slant range samples in meters (SLC ONLY) | float64 | meters | 0.95172208888 | ||||

`slant_range_to_first_pixel` |
Two-way slant range distance corresponding to near range (1st sample) | float64 | metres | |||||

`spec_version` |
Version of the Level 1 Product Format Specification document | float64 | number | 2.3 | ||||

`state_vector_time_utc` |
Timestamp for each orbit state vector | list of ASCII | UTC time | [2019-03-10T18:19:48.000000, ...] | ||||

`total_processed_bandwidth_azimuth` |
Doppler bandwidth used for azimuth compression (defines achievable azimuth resolution) | float64 | Hz | 2893 | ||||

`tropo_range_delay` |
Mean signal path length correction (one way) that has been applied to correct for tropospheric propagation | float64 | meters | 2.4 | ||||

`velX` |
X-component of state vector velocity, for each state vector | vector of float64 | meters/sec | [-3285.698...-3245.220] | ||||

`velY` |
Y-component of state vector velocity, for each state vector | vector of float64 | meters/sec | [-3162.667...-3051.016] | ||||

`velZ` |
Z-component of state vector velocity, for each state vector | vector of float64 | meters/sec | [-6130.372...-6208.463] | ||||

`window_function_azimuth` |
Windowing function used over azimuth frequencies | ASCII | text | taylor_20_4 | ||||

`window_function_range` |
Windowing function used over range frequencies | ASCII | text | taylor_20_4 | ||||

`yaw` |
Yaw angle of the satellite attitude | float | degrees | |||||

`zerodoppler_end_utc` |
Time corresponding to when the satellite was at the zero Doppler position for the last scene pulse | ASCII | UTC time | 2019-03-10T18:20:00.960210 | ||||

`zerodoppler_start_utc` |
Time corresponding to when the satellite was at the zero Doppler position for the first scene pulse | ASCII | UTC time | 2019-03-10T18:19:51.775477 |