Skip to content

Ortho (L1D/L1D_SR)

drawing

Product description

The L1D and L1D_SR imagery products are 4-band (RGB and Near infrared) product designed for accuracy and best of class image quality. It is delivered to customers after going through radiometric and geometric correction process.

The ortho products are currently offered in two major processing levels:

  • L1D TOA Reflectance (L1D)
  • L1D TOA Reflectance SuperResolution (L1D_SR)

L1D_TOA, is a 4 bands (blue, green, read and Near Infrared) imagery product with Top of the Atmosphere reflectance records measurements in physical units, and enables analysts to perform basic classifications and analytics. The imagery is radiometrically and geometrically corrected. Pixel values are scaled to TOA Reflectance (0 to 1) multiplied by a factor 10000 (1e4) to avoid float numbers. L1D TOA has a resolution of 1m for Mark IV and 0.7m for Mark V after resampling, which harmonises native pixel size that varies between 0.7m and 1.3m.

L1D_SR_TOA goes through one step further in processing which applies proprietary super resolution algorithm to improve the Ground Sample Distance (GSD) from 1m to 70 cm for Mark IV satellites and from 70cm to 50cm for Mark V satellites.

Both L1D and L1D_SR products are currently delivered along with a corresponding VISUAL Products called L1D_VISUAL and L1D_SR_VISUAL. This is a 3 bands imagery (red, green and blue) derived from the TOA product, processed with a color enhancement algorithm as descibed at section.

The figure below illustrates the high level image processing workflow, which begins upon receiving raw data and is completed after the transfer of processed data to the image catalog and product delivery package:

drawing

For geometric and radiometric processing details please refer to Image processing section.

Tiles

drawing The L1D/L1D_SR tiles are available on the Archive STAC API. Each STAC item is a 2km by 2km square tile. They are aligned to a fixed discrete grid, aligned to the prime meridian of each UTM zone (coordinate 500000m). Each tile has a designated grid code included in the property grid:code as follows:

SATL-<GRID SIZE>-<UTM ZONE> _ <X> _ <Y>

Where X and Y correspond to the easting and northing coordinates of the bottom left corner of the tile.

For example the grid:code SATL-2KM-10N_298_2062 should be interpreted as: - SATL grid of 2km by 2km - On UTM zone 10N - With the left bottom corner at 298,000m easting and 2062,000m northing.

Technical Specifications

Parameter

Mark IV

Mark V
Sepctral bands

Blue : 450 - 510 nm
Green: 510 - 580 nm
Red : 590 - 690 nm
NIR : 750 - 900 nm

Blue : 450 - 517 nm
Green: 517 - 583 nm
Red : 597 - 690 nm
NIR : 759 - 890 nm

GSD

1m (L1D) / 0.7m for (L1D_SR)

0.7m (L1) / 0.5m (L1_SR)

Scene Swath

4.8 - 5.5 Km 1

6.8Km - 8.5Km 1

Image bit depth

8-bit for VISUAL, 16 bit for TOA

⁠
Max Off-Nadir angle

± 25 deg

⁠
Algorithms applied

Radiometric correction, Band Aligment, Fine geolocation, Projection to UTM and orthorection

⁠
Geolocation Accuracy

10m CE90 Varies with the availabilty of GCPs and cloud coverage2

⁠
Band aligment

<= 2px

⁠
Image format

GeoTiff, LZW loseless compression

⁠
Ancilliary files

Cloud mask (GeoTiff), preview (PNG), thumbnail (PNG) and imagery footprint in vector format.

 ⁠

STAC item

Assets

  1. thumbnail
  2. preview
  3. analytic
  4. visual
  5. cloud
  6. toa_factors

Non documented files or parameters should be ignored.

All assets follow the same basename template.

{DATE}_{TIME}_{SECOND_DECIMALS}_{SATELLITE}_{PRODUCT}_{PAYLOAD}_{VERSION}_{SUFFIX}.{EXTENSION}

  • DATE: Year(4 digits)month(2 digits)day(2 digits)
  • TIME: Hour(2 digits)minute(2 digits)second(2 digits)
  • SECOND_DECIMALS: All the decimal part from the timestamp seconds
  • SATELLITE: Satellite number
  • PRODUCT: L1D / L1D_SR
  • PAYLOAD: MS for multispectral (4 bands)
  • VERSION: Check Changelog. Only present in the metadata asset.
  • SUFFIX: depends on the asset, can be empty.
  • EXTENSION: depends on the asset type.

All time values refer to the capture time in UTC. Hence the string 20220619_153346_938represent actually 2022-06-19 15:33:46.938.

Raster, preview and thumbnail

drawing drawing drawing







Visual

8bits, RGB enhanced version of the original BGRNIR raster. With the same spatial resolution.

Cloud

Cloud masks are provided as single band GeoTIFFs. Check here for details and how masks are computed for L1D product. For L1D_SR, the cloud masks are inherited from the corresponding L1D product and upscaled with a nearest neighbour strategy to the target resolution.

CLOUD_MASKS

Example of clouds detected by Satellogic clouds detector.

Toa Factors

The L1D/L1D_SR product raster is provided in Top Of Atmosphere (TOA) reflectance units (which take values between zero and one), encoded with a 10000 factor in order to fit them in a standard Tiff file. The conversion radiometric conversion factors are inherited from the input images(L1C) processing level.

Item metadata

Prefix Field Name Description Example
n/a id Unique identifier for the STAC item 
20250930_025801_143_SN45_L1C_MS_2_0_0
n/a bbox Item bounding box 
[
  119.56896495671906,
  23.62805912936759,
  119.65730868533569,
  23.690097800133774
],
n/a geometry Product footprint polygon or multi polygon 
{
  "type": "Polygon",
  "coordinates": [
      [
          [-59.39745426956545,
          -14.839874521738926],
          [-59.397653769623574,
          -14.857959361744172],
          [-59.37906678933578,
          -14.858152718581847],
          [-59.37886883226247,
          -14.840067632759192],
          [-59.39745426956545,
          -14.839874521738926]
      ]
  ]
},
n/a assets List of the assets available for a given item 
{
  "preview": {
      "href": "link to the file",
      "type": "image/png",
      "roles": [
          "overview"
      ]
  },
  "rpc": {...},
  "cloud": {...},
  "analytic": {...},
}
n/a collection Collection name 
l1d
properties gsd Ground sample distance in meters 
0.7
properties proj : shape Dimension of image in pixels (Height x Width) 
[2861, 2860]
properties grid:code Satellogic 2x2km grid code 
SATL-2KM-21S_242_8356
properties instruments Options are MS for multispectral and HS for hyperspectral 
ms
properties datetime Capture time 
2025-09-06T18:43:23.402269+00:00
properties platform Satellite name that acquired the imagery 
newsat46
properties proj:epsg EPSG code of the Coordinate Reference System in which the image coordinates are 
4326
properties view : azimuth Viewing 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) 
166.1138
properties view : off_nadir The angle from the sensor between nadir (straight down) and the scene center. Measured in degrees (0-90). In case this angle cannot be computed, a value of -1 will be reported 
24.9490
properties view : sun_azimuth Sun 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) 
72.3332
properties view : sun_elevation The estimated sun elevation measured at the target at the moment of the capture. Value in degrees. 
60
properties satl : satellite_generation Satellite generation category, mainly to differentiate between MarkIV and MarkV 
MarkV
properties satl : outcome_id The UUID of the entire capture this individual frame is part of 
ffbabb4f-3a97-45ec-bca3-0e4d56608c1c
properties satl : valid_pixel Percentage of pixels that are valid, from 0 to 100 
100
properties satl : exposure_sec Exposure time of capture in seconds 
0.002769
properties satl : product_name The product name 
L1C
properties satl : last_modified Timestamp when the product was last processed 
2025-09-30T04:30:38.122305+00:00
properties satl : transaction_id Internal processing transaction identifier 
l0-pipeline-cw5td
properties satl : product_version Product Version 
2.1.1
properties satl : software_version Internal software version used to process the product 
1.36.1
properties satl : satellite_altitude Satellite altitude in meters 
498240.1195991831
properties satl : ground_lock Boolean value that indicates if the processor was capable to find gcps at the capture 
true
properties satl-qa : qa_software_version Quality Control project SW version 
2.11.2
properties satl-qa : snr_blue Signal To Noise Ratio for the blue band, In case this metric cannot be computed, a value of -999 will be reported 
64.353
properties satl-qa : snr_green Signal To Noise Ratio for the green band, In case this metric cannot be computed, a value of -999 will be reported 
56.291
properties satl-qa : snr_red Signal To Noise Ratio for the red band, In case this metric cannot be computed, a value of -999 will be reported 
38.133
properties satl-qa : snr_nir Signal To Noise Ratio for the NIR band, In case this metric cannot be computed, a value of -999 will be reported 
23.073
properties satl-qa : burnt_blue Burnt pixels percentage for the blue band, In case this metric cannot be computed, a value of -999 will be reported 
0
properties satl-qa : burnt_green Burnt pixels percentage for the green band, In case this metric cannot be computed, a value of -999 will be reported 
0
properties satl-qa : burnt_red Burnt pixels percentage for the red band, In case this metric cannot be computed, a value of -999 will be reported 
0
properties satl-qa : burnt_nir Burnt pixels percentage for the NIR band, In case this metric cannot be computed, a value of -999 will be reported 
0
properties satl-qa : sharpness_fwhm_act_blue Full Width Half Maximum across-track value in pixels for blue band*, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : sharpness_fwhm_act_green Full Width Half Maximum across-track value in pixels for green band*, In case this metric cannot be computed, a value of -999 will be reported 
3.675
properties satl-qa : sharpness_fwhm_act_red Full Width Half Maximum across-track value in pixels for red band*, In case this metric cannot be computed, a value of -999 will be reported 
3.241
properties satl-qa : sharpness_fwhm_act_nir Full Width Half Maximum across-track value in pixels for NIR band*, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : sharpness_fwhm_alt_blue Full Width Half Maximum along-track value in pixels for blue band*, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : sharpness_fwhm_alt_green Full Width Half Maximum along-track value in pixels for green band*, In case this metric cannot be computed, a value of -999 will be reported 
3.008
properties satl-qa : sharpness_fwhm_alt_red Full Width Half Maximum along-track value in pixels for red band*, In case this metric cannot be computed, a value of -999 will be reported 
2.846
properties satl-qa : sharpness_fwhm_alt_nir Full Width Half Maximum along-track value in pixels for NIR band*, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : dr_blue Dynamic Range for the blue band* *, In case this metric cannot be computed, a value of -999 will be reported 
96.728
properties satl-qa : dr_green Dynamic Range for the green band* *, In case this metric cannot be computed, a value of -999 will be reported 
123.545
properties satl-qa : dr_red Dynamic Range for the red band* *, In case this metric cannot be computed, a value of -999 will be reported 
150.386
properties satl-qa : dr_nir Dynamic Range for the NIR band* *, In case this metric cannot be computed, a value of -999 will be reported 
81.207
properties satl-qa : cc_blue Dynamic Range for the blue band* *, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : cc_green Dynamic Range for the green band* *, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : cc_red Dynamic Range for the red band* *, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : cc_nir Dynamic Range for the NIR band* *, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : alignment_ce95_blue The 95th percentile of the band-to-band alignment error between the green and blue bands is reported in meters, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : geoaccuracy_ce90 The 90th percentile of the geoaccuracy error reported in meters, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : geoaccuracy_rmse The root mean square error of the geoaccuracy error reported in meters, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : alignment_ce95_red The 95th percentile of the band-to-band alignment error between the green and red bands is reported in meters, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-qa : alignment_ce95_nir The 95th percentile of the band-to-band alignment error between the green and nir bands is reported in meters, In case this metric cannot be computed, a value of -999 will be reported 
-999
properties satl-insights : lulc_snow Land use/land cover percentage for snow 
0
properties satl-insights : lulc_urban Land use/land cover percentage for urban areas 
8.1
properties satl-insights : lulc_water Land use/land cover percentage for water 
77.3
properties satl-insights : lulc_forest Land use/land cover percentage for forest 
12.6
properties satl-insights : lulc_bareland Land use/land cover percentage for bare land 
0.5
properties satl-insights : lulc_cropland Land use/land cover percentage for cropland 
0
properties satl-insights : lulc_grassland Land use/land cover percentage for grassland 
1.5
n/a tile_geometry Tile bounding box 
{
  "type": "Polygon",
  "coordinates": [
    [
        [-59.39745426956545,
        -14.839874521738926],
        [-59.39765383942619,
        -14.857965685109374],
        [-59.37906035733394,
        -14.858159109401297],
        [-59.37886233153779,
        -14.8400677000418],
        [-59.39745426956545,
        -14.839874521738926]
    ]
  ]
},

* See Sharpness. Due to the provisional use of a feature mask that may fail to mask textured clouds, the reported sharpness metric should be considered fully reliable only in frames without cloud cover. A proper cloud mask implementation is pending.
* *Detailed documentation pending.

Packaging specification

If delivered as a package scene (via S3, FTP, or Zip download link), an L1C delivery contains the assets (see previous Product components section) of all/a subset of the L1C products that make up that scene. The metadata available in STAC API is included as a JSON file.

Additionally, every L1D/L1D_SR package includes a digital signature to ensure data authenticity and integrity. Each package contains a manifest file and cryptographic signature that allows verification that the delivered data has not been tampered with. Learn more about Digital Signature verification. Package content

.
├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_{task_id}.metadata.json
├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_{task_id}.zip
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_CLOUD.vrt
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_footprint.kml
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_metadata_iso.xml
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_metadata_stac.geojson
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_preview.png
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_solar_and_viewing_angles.geojson
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_thumbnail.png
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_toa_factors.geojson
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_TOA.vrt
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_TOA.vrt.ovr
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_VISUAL.vrt
│   ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_VISUAL.vrt.ovr
│   └── rasters
│       ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_CLOUD_{vrt_index}".tif
│       ├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_TOA_{vrt_index}".tif
│       └── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_VISUAL_{vrt_index}".tif
├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_preview.png
├── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_thumbnail.png
└── {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_VISUAL.tif

Deliverable framing

drawing

Ortho products are currently packaged as entire scenes. Each scene is a full swath (approximately 5Km) image with a varying length depending on the capture or requiered area by the user. In case the of very big scenes, the scene is divided into 10km chunks and identified with a chunk number indicated at the end of the file name starting from 0. Also the provided VRT merges all these chunks for easier manipulation.

drawing

For example, a long scene is shown on the right that has been automatically "chunked" into 3 ~10Km chunks. Colors and transparency had been modified to show the concept.

Products are projected to the corresponding projection according to their closest matching UTM Zone. The projection is indicated in the proj:epsg property of each product metadata. If a scene is captured across different zones, the entire scene and corresponding chunk are projected to the zone with more data.






Solar and viewing angles

{date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_solar_and_viewing_angles.geojson file contain the tiled information related to the satellite viewing angles, altitude and solar angles.

Properties Example
satellite viewing angles 
{
  "azimuth": 88.659999999999997,
  "off_nadir": 14.56,
  “incidence_angle”: 16,
  "units": "degrees"
}
solar angles 
{
  "azimuth": 98.519999999999996,
  "elevation": 54.619999999999997,
  “zenith”: 46,
  "units": "degrees"
}
satellite altitude 
{
  "units": "meters",
  "values": 407043.03
}

Toa factors

The L1D/L1D_SR product is calibrated into Top Of Atmosphere units. Products are in units of reflectance which are a 0-100% value. In order to fit them in a standard Tiff file, the decimal percentage mapped to 0-10000 units. In order to convert it to radiance, calibration factors are included in {date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_toa_factors.geojson file that contain the tiled information about the radiometry transformations.

Properties Example
toa_to_radiance_units 
W / (m^2 . nm . sr)
toa_reflectance_to_radiance 
{
    "blue": 4.776162676561445,
    "green": 4.844255590869656,
    "nir": 13.011088418320432,
    "red": 4.919852418190033
},
reflectance_scale_factor 
{
    "blue": 0.0001,
    "green": 0.0001,
    "nir": 0.0001,
    "red": 0.0001
}

*Non documented parameters should be ignored.

Metadata files

Included in the deliverable package we have three different files

Root metadata file

{date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_{task_id}.metadata.json

Prefix Field Name Description Example
n/a id Unique identifier for the STAC item 
20250820_052828_SN40_L1D_SR_MS_310794_2
n/a bbox Item bounding box 
[
  119.56896495671906,
  23.62805912936759,
  119.65730868533569,
  23.690097800133774
],
n/a geometry Product footprint polygon or multi polygon 
{
  "type": "Polygon",
  "coordinates": [
      [
          [-59.39745426956545,
          -14.839874521738926],
          [-59.397653769623574,
          -14.857959361744172],
          [-59.37906678933578,
          -14.858152718581847],
          [-59.37886883226247,
          -14.840067632759192],
          [-59.39745426956545,
          -14.839874521738926]
      ]
  ]
},
n/a assets List of the assets available for a given item 
{
  "preview": {
      "href": "link to the file",
      "type": "image/png",
      "roles": [
          "overview"
      ]
  },
  "cloud": {...},
  "analytic": {...},
  ...
}
n/a collection Collection name 
deliverables
properties gsd Ground sample distance in meters 
0.5
properties created Deliverable creation date 
2025-09-01T20:04:56.442757Z
properties platform Satellite name that acquired the imagery 
newsat46
properties datetime Capture time 
2025-09-06T18:43:23.402269+00:00
properties platform Satellite name 
newsat40
properties proj:epsg EPSG code of the Coordinate Reference System in which the image coordinates are 
4326
properties providers Imagery acquisition responsible 
[
  {
    "url": "https://satellogic.com/",
    "name": "Satellogic",
    "roles": [
      "producer",
      "processor"
    ],
    "description": "High-resolution geospatial imagery and analytics"
  }
]
properties instruments Options are multispectral and hyperspectral 
multispectral
properties satl : task_id Tasking identifier 
1661138
properties satl : task_name Tasking name 
target A
properties satl : area_km2 Deliverable area in square kilometers 
61.3
properties satl : outcome_id The UUID of the entire capture this individual frame is part of 
ffbabb4f-3a97-45ec-bca3-0e4d56608c1c
properties satl : project_id The project identifier 
2241
properties satl : project_name The project name 
project A
properties satl : client_name The client identifier 
client X
properties satl : exposure_sec Exposure time of capture in seconds 
0.002769
properties satl : product_name The product name 
L1D_SR
properties satl : product_version Product Version 
1.4.0
properties satl : satellite_generation Satellite generation category, mainly to differentiate between MarkIV and MarkV 
MarkV
properties eo : cloud_cover" Percentage of the image covered by clouds 
6.37
properties constellation Satellite constellation 
Aleph1
properties view : azimuth Viewing 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) 
166.1138
properties view : off_nadir The angle from the sensor between nadir (straight down) and the scene center. Measured in degrees (0-90). In case this angle cannot be computed, a value of -1 will be reported 
24.9490
properties view : sun_azimuth Sun 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) 
72.3332
properties view : sun_elevation The estimated sun elevation measured at the target at the moment of the capture. Value in degrees. 
60


Geojson version of the STAC metadata

{date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_metadata_stac.geojson

Geometry attribute Description Example
gsd Ground sample distance in meters 
0.5
created Deliverable creation date 
2025-09-01T20:04:56.442757Z
platform Satellite name that acquired the imagery 
newsat46
datetime Capture time 
2025-09-06T18:43:23.402269+00:00
platform Satellite name 
NewSat
proj:epsg EPSG code of the Coordinate Reference System in which the image coordinates are 
4326
providers Imagery acquisition responsible 
[
  {
    "url": "https://satellogic.com/",
    "name": "Satellogic",
    "roles": [
      "producer",
      "processor"
    ],
    "description": "High-resolution geospatial imagery and analytics"
  }
]
instruments Options are multispectral and hyperspectral 
multispectral
satl : outcome_id The UUID of the entire capture this individual frame is part of 
ffbabb4f-3a97-45ec-bca3-0e4d56608c1c
satl : exposure_sec Exposure time of capture in seconds 
0.002769
satl : product_name The product name 
L1D_SR
satl : product_version Product Version 
1.4.0
satl : satellite_generation Satellite generation category, mainly to differentiate between MarkIV and MarkV 
MarkV
eo : cloud_cover" Percentage of the image covered by clouds 
6.37
constellation Satellite constellation 
Aleph1
view : azimuth Viewing 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) 
166.1138
view : off_nadir The angle from the sensor between nadir (straight down) and the scene center. Measured in degrees (0-90). In case this angle cannot be computed, a value of -1 will be reported 
24.9490
view : sun_azimuth Sun 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) 
72.3332
view : sun_elevation The estimated sun elevation measured at the target at the moment of the capture. Value in degrees. 
60


ISO 19115-2 Metadata

{date}_{time}_{second_decimals}_SN{sn}_{product_name}_{payload}_metadata_iso.xml

Satellogic adheres to industry standards governing metadata schemas that align with ISO standards. The adoption of ISO 19115 (ISO metadata standard) ensures that information about sensor identification, image extent, quality, spatial and temporal aspects, content, spatial references, distributions, and other properties of digital geographic data are provided in a XML format for customers seeking to integrate Satellogic map-ready orthorectified raster data directly into their workflows. The table below shows the metadata fields according to ISO 19115-2:

Identifier Type Description
gmd:fileIdentifier string

Unique file identifier
gmd:language code

Language used for metadata (eng)
gmd:characterSet code

Character coding standard in the metadata (utf8)
gmd:contact string

Contact information of the company responsible for the metadata information (Satellogic)
gmd:dateStamp date

Date of dataset creation in UTC
gmd:metadataStandardName string

Name of the metadata standard used (ISO)
gmd:metadataStandardVersion string

ISO metadata standard version
Spatial representation information: grid spatial representation
gmd:numberOfDimensions integer

Number of independent spatial-temporal axes (2d: x, y )
gmd:axisDimensionProperties string/integer

Dimension name (column) and size (integer), resolution (m)
gmd:cellGeometry code

Grid data identification (area)
gmd:transformationParameterAvailability boolean

Dataset coordinates and geographic or map coordinates availability
gmd:referenceSystemInfo string/date

Information of CRS provider, release date, version and edition details
Metadata extension information
gmd:MD_ExtendedElementInformation string

Exposure time (seconds) and responsible party information (Satellogic)
Data identification
gmd:Citiation_title string

Name of the dataset
gmd:Cititation_Date data

date in UTC
gmd:abstract string

Scene set identification (Scene set ID)
gmd:pointOfContact string

Contact information
gmd:resourceMaintenance string

Information on dataset maintenance
gmd:resourceConstraints string

The limitations or constraints on the use of or access to dataset
gmd:spatialRepresentationType code

Object used to represent the geographic information
gmd:language code

Languages of the dataset using standard ISO three letter codes (eng)
gmd:characterSet code

Character coding standard in the dataset
gmd:environmentDescription string

Describes the dataset's processing environment
gmd:extent decimal

Information about geographic extent of the dataset (bounding box coordinates)
gmd:supplementalInformation string

Satellogic constellation, satellite name and satellite generation
Content info
gmd:attributeDescription string

Sensor type
gmd:contentType string

Dataset content type
gmd:dimension string

Imagery bands information (name and wavelength)
gmd:illuminationElevationAngle decimal

Sun elevation angle in degrees
gmd:illuminationAzimuthAngle decimal

Sun azimuth angle in degrees
gmd:imageQualityCode string/date

Metadata standard and version release
gmd:cloudCoverPercentage decimal

Percentage of the are covered by clouds
gmd:processingLevelCode string

Corresponds to data product level
gmd:compressionGenerationQuantity integer

Compression information
Distribution info
gmd:distributionFormat string

Dataset format name and version


Additionally, every L1D and L1D_SR package includes a digital signature to ensure data authenticity and integrity. Each package contains a manifest file and cryptographic signature that allows verification that the delivered data has not been tampered with. Learn more about Digital Signature verification.

Known issues

This section lists imagery product anomalies which sometimes slip through the automatic quality assurance filters due different reasons, apprearing clearly different from images that have gone though imagery quality assurance pipeline. The most known anomlalies are explained in this section.

Flipped pixel values in RGB enhanced images

The current image enhancement algorithm causes some flipped pixel values in saturated areas. This will be corrected in future versions of the pipeline.

ORTHO_FLIPPED_ISSUE

Flipped pixel values visible in saturated areas of RGB composites.

Reduced geo-accuracy

Some terrain types and environmental conditions might cause the Ground Control Points (GCPs)-based geometric correction to fail, producing captures of lower geo-accuracy. Standard imagery products are delivered with less than 10m geoaccuracy, however, because of high terrain and the lack of GCPs, especially in areas wihtout human made structures such over water, deserts, forests etc., less than 10m geoaccuracy is not achievable, hence some delivered images might show a shift in geolocation. In some extreme cases, such as over open water, such products are marked as a low geoacurracy quality tier and not generaly delivered to customers, but are available on demand for customers who do not have strict geoaccuracy requirements. Some examples are provided below.

ORTHO_GEO_ISSUE

Rural area close to mountain shadow in hilly terrain (left), showing reduced geo-accuracy. Features were shifted 77m relative to the reference map. On the right is the reference source - obtained from ESRI imagery.

Digital Elevation Model (DEM) distortions

Orthorectified images can present distortions in the presence of outliers in the DEM used during imagery processing. Satellogic is able to detect these problems in the DEM and use alternative models. Occasionally the detector may fail to locate the outliers and produce an effect like the one shown in the image below. This anomaly can be corrected through identifying the outlier in the DEM and reprocessing of the affected scene.

ORTHO_DISTORTION

Distortion in an orthorectified image.

Discontinuities

Discontinuities may also been inherited from L1C processing level

Changelog L1D_SR

Version Release date Change log
2.0.0 17/11/2025
    Changed
  • Metadata harmonizations
    • Renamed TOA factors asset fields for clarity:
      radiance_to_reflectance → removed
      toa_reflectance_to_radiance → added
      reflectance_scale_factor → added
      vicarious_correction → removed
      toa_to_reflectance → removed
      toa_to_dn → removed
      dn_to_radiance → removed
      sun_irradiance → removed
      earth_sun_distance → removed
    • Change satellite_altitude units from kilometers to meters
    • Changed convention of view:azimuth to, the angle measured from the satellite point (point on the ground below the platform) between the scene center and true north. Measured clockwise from north in degrees (0-360). As defined in STAC View extension
  • Changed cloud mask codification, from [0: no_data, 1: valid_data, 128: cloud] to [0: no_data, 1: clear, 2: haze, 3: cloud]. New category "clear" replaces old category "valid_data". For further details check Cloud Mask section
  • 2x2km tiles
1.4.0 21/08/2025
    Added
  • Include field "satl:satellite_generation"
1.4.0 11/06/2025
    Added
  • Include field "satl:l1d_product_version" for the collection l1d-sr
    • Fixed
  • Fix vertical tonal differences occurring in large captures
1.3.0 04/06/2025
    Added
  • Included sharpness metrics for L1D-SR (STAC API fields under satl-qa prefix)
    • Fixed
  • Fix in computation of SNR and DR metrics (STAC API fields under satl-qa prefix)
    • Changed
  • Fine tuning of the super resolution model for Mark5 imagery
1.1.2 19/12/2024
  • See CHANGELOG L1D for the details. Note from this date L1D and L1D_SR CHANGELOG are separated

Changelog L1D

Version Release date Change log
2.0.0 17/11/2025
    Changed
  • Metadata harmonizations
    • Renamed TOA factors asset fields for clarity:
      radiance_to_reflectance → removed
      toa_reflectance_to_radiance → added
      reflectance_scale_factor → added
      vicarious_correction → removed
      toa_to_reflectance → removed
      toa_to_dn → removed
      dn_to_radiance → removed
      sun_irradiance → removed
      earth_sun_distance → removed
    • Change satellite_altitude units from kilometers to meters
    • Changed convention of view:azimuth to, the angle measured from the satellite point (point on the ground below the platform) between the scene center and true north. Measured clockwise from north in degrees (0-360). As defined in STAC View extension
  • Changed cloud mask codification, from [0: no_data, 1: valid_data, 128: cloud] to [0: no_data, 1: clear, 2: haze, 3: cloud]. New category "clear" replaces old category "valid_data". For further details check Cloud Mask section
  • 2x2km tiles
1.2.0 12/06/2025
    Changed
  • Change datetime of every L1D STAC item (field: 'datetime') from the sceneset datetime to the exact item datetime. The change is reflected in the file naming of each L1D item on the STAC catalog
  • Generally the naming of an item is defined as <DATE>_<TIME>_SN<SATELLITE_NUMBER>_<L1D>_MS_<GRID_CODE>_<PRODUCT_VERSION>. From version v1.2.0 every item will have its own <TIME> rather than the capture time
    • Example:
    Before: Item ids differed only for tile grid number
    20250612_075918_430_SN46_L1D_MS_38N_456_4852_1_1_2
    20250612_075918_430_SN46_L1D_MS_38N_472_4848_1_1_2
    After: Item ids also differ for <TIME>
    20250617_094442_485_SN28_L1D_MS_42N_740_3616_1_2_0
    20250617_094445_023_SN28_L1D_MS_42N_736_3596_1_2_0
1.1.2 19/12/2024
    Fixed
  • Fix random grid pattern introduced in image orthorectification algorithm
1.1.1 07/11/2024
    Fixed (STAC archive)
  • Fix L1D visual rasters no data values. Some valid pixels were set as no data
1.1.0 06/11/2024
    Changed
  • Update visual product (3 bands RGB 8 bits) color correction
  • Replace Histograms stretching with custom color curve to reduce colors inconsistency between scenes
1.0.1 14/10/2024
    Changed (STAC archive)
  • Changed analytic and cloud rasters to be COG, add band interpretation to rasters
1.0.0 01/10/2024
    Changed (Delivery package)
  • Change product namings: L1 → L1D TOA, L3 → L1D VISUAL, L1_SR → L1D_SR TOA, L3_SR → L1D_SR VISUAL
  • Change file names to new naming convention with _TOA, _CLOUD, _VISUAL suffixes
  • Change fields names in toa_factors: L1_to_radiance → toa_to_radiance, L1_to_reflectance → toa_to_reflectance, removed toa_product, idx_x, idx_y
  • Change fields names in solar_and_viewing_angles: satellite/elevation → satellite/incidence_angle, removed idx_x, idx_y
  • Removed fields from metadata_stac: title, description, proj:centroid
    • Added (Delivery package)
  • Added overview files: .vrt.ovr for TOA and VISUAL products
  • Added view fields to metadata_stac: view:sun_azimuth, view:azimuth, view:incidence_angle
    • Changed (STAC archive)
  • Rename files with new convention
  • Change band orders of analytic product from RGBN to BGRN
  • Move properties from satl to toa_factors asset: reflectance and radiance conversion factors
  • Move metrics properties from satl to satl-qa prefix and rename: geoaccuracy metrics, SNR, color correction metrics
    • Added (STAC archive)
  • Added properties: satl:ground_lock, satl:exposure_time, satl:satellite_generation, instruments
  • Added toa_factors attachments as asset
  • Added stac-qa properties: dynamic range per band, alignment metrics, exposure time, satellite altitude
0.3.0 12/07/2024 Changed
  • Change higher percentile in histogram stretching of L3 product to deal with saturation on bright objects
0.2.0 29/04/2024 Fixed
  • Fix Stray light correction for MarkV imagery
Added
  • Improve sharpness for MarkV imagery
Changed
  • Change DN conversion to 10 bits
0.1.0 03/04/2024 Added
  • Post to new archive 2.0 L1D and L1D-SR products

Imagery End User Rights Agreement and Terms of Use

All imagery products are delivered under Satellogic Imagery End User License Agreement. The terms and conditions of the agreement are available to customers and accessible online on the website under License Agreement.

  1. Varies with altitude of the satellites and off nadir angle. ↩↩

  2. Varies with terrain and only applicable for terrains with rich features. ↩