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deimos-2
very-high resolution, multispectral
75-cm pan-sharpened imagery

pangeo
alliance

DEIMOS-2 is a Very-High Resolution (VHR), multispectral, agile satellite capable of providing 75-cm pan-sharpened imagery.

 

Spatial Resolution

The Ground Sampling Distance (GSD) is 1.0 m for the Panchromatic channel and 4.0 m for the Multispectral channels. DEIMOS-2 standard pan-sharpened product (ortho) has a pixel size of 75 cm, after re-sampling. All resolutions refer to at Nadir observation conditions. Products with other spatial resolutions and resampling are available under request.

Temporal Resolution: Revisit Time

In order to minimize the revisit time, DEIMOS-2 is configured to have ±45 degrees off nadir pointing capability. With maximum tilt, the field of regard (FOR) can be extended to more than 600 km from nadir. The average global revisit time (±45 degrees) is 2 days.

Spectral Bands

The DEIMOS-2 system includes panchromatic and multispectral cameras, acquiring data simultaneously. The multispectral capability includes 4 channels in visible and near infrared spectral range (red, green, blue, and NIR). The spectral range of each band is listed below:

Panchromatic Mode:
560 nm to 900 nm
Multispectral Mode:
Blue: 466 nm – 525 nm
Green: 532 nm – 599 nm
Red: 640 nm – 697 nm
NIR: 770 nm – 892 nm

Acquisition Modes

DEIMOS-2 has four imaging modes: single strip imaging, multi-pointing imaging, single-pass stereo imaging and tessellation imaging:

Single Strip Imaging

12 km wide and up to 1,400 km long image. The satellite has a ±45 degrees across-track tilting capability (being ±30 degrees the nominal range).

Multi-pointing Imaging

DEIMOS-2 is capable of performing multi-pointing imaging, switching from one target to another with minimum idle time.

Single Pass Stereo Imaging

Two acquisitions of the same area in the same orbit, with different pitch angles. Images are 12-km wide and up to 200 km long. The viewing angles are different for the two images, in order to allow the generation of 3D models.

Tessellation Imaging

Two acquisitions of the same area in the same orbit, with different pitch and roll angles. Images are 24-km wide and up to 200 km long (composed from the acquisition of two adjacent strips, 12-km wide each, and captured with a lag of a few seconds).

System Capacity

DEIMOS-2 has a capacity to capture up to 200,000 Km2 per day. The data volume is managed using a 256 Gbits (32 Gbytes) storage capacity using SDRAM memory devices, which allows to image a ground strip longer than 1,400 km in a single pass. Data are downloaded using a 160 Mbps X-band Image Transmission Unit (ITU).

Standard Products:

  • Pan-sharpened: a four-band image, resulting from adding the information of each multispectral band to the panchromatic band. The fusion does not preserves all spectral features of the multispectral bands, so it should not be used for radiometric purposes.
  • Panchromatic: a single-band image coming from the panchromatic sensor.
  • Multispectral: a four-band image coming for the multispectral sensor, with band co-registration.
  • Bundle (Panchromatic + Multispectral bands): a five-band image containg the panchromatic and multispectral products packaged together, with band co-registration.
  • Stereo Pair: The image products obtained from two acquisitions of the same target performed from different viewpoints in the same pass by using the agility feature of the platform. It can be provided as a pair of pan-sharpened or panchromatic images.

All products are generated at 10 bits, but can be provided at 8-bits format upon Customer’s request.The following table resume the nomenclature used to define DEIMOS-2 standard products.

Product Type

Name

Description

Pan-sharpened

PSH

PS3

PS4

Pan-sharpened 4 bands

Pan-sharpened 321 Natural Colors

Pan-sharpened 432 False Colors

Panchromatic

PAN

Panchromatic only

Multispectral

MS4

4 Multispectral files only

Bundle

PM4

Bundle (Pan + Multispectral)

Table 1: DEIMOS-2 Product Type Naming Convention

Processing Levels

DEIMOS-2 products are available in two different processing levels:

Level 1B

A calibrated and radiometrically corrected product, but not resampled. The geometric information is contained in a rational polynomial.
The product includes: the Rational Polynomial Coefficients (RPC); the metadata with gain and bias values for each band, needed to convert the digital numbers into radiances at pixel level, and information about geographic projection (EPGS), corners geolocation, etc.

Level 1C

A calibrated and radiometrically corrected product, manually orthorectified and resampled to a map grid. The geometric information is contained in the GeoTIFF tags. By default, the reference base for orthorectification is Google Earth. Other user-provided bases can be used on demand. Typical geometric error of this product (RMSE) is < 20 m.

JPEG-2000 format is also available on demand for all processing levels.
Table 2 summarizes DEIMOS-2 products and characteristics. Note that Spatial Resolution refers to resolution at Nadir, and it depends on observation angle.

Processing Level and Spatial Resolution
Product Type L1B (native) L1C (ortho) Spectral Bands
Pan-sarpened 1.0 m 75 cm All R,G,B NIR,R,G
Pan 1.0 m 75 cm Only Pan Band
MS 4.0 m 3.0 m Only MS Bands
Bundle (Pan+MS) 1.0 m (P), 4.0 m (MS) 75 cm (P), 3.0 m (MS) All

Table 2: DEIMOS-2 Products Characteristics vs. Processing Level

PAN L1B

PS3 L1C

PS4 L1C

Table 3: Example of DEIMOS-2 Products

FILE FORMAT

DEIMOS-2 products are provided in DIMAP format. It consist of two parts, one for the image and the other for a description of the image (Metadata). The image products for DEIMOS-2 are provided by default in GeoTIFF. Other formats are also available such as jpg, dim, html and tif.

DELIVERY METHODS

Deimos Imaging offers a wide variety of delivery methods for DEIMOS-2 products, which can be adapted to Customer’s requirements.Usually, products are delivered via FTP Pull, being placed in an FTP hosted by Deimos Imaging. On Customer’s request, data can be delivered via FTP Push (i.e. on an FTP set up by the Customer), or via a physical mean sent by courier (USB stick, hard disk or DVD).

24/7 end-to-end service

Rush tasking orders for DEIMOS-2 images are accepted in support of emergency events, global security, maritime surveillance and various other applications in which fast delivery of satellite data is crucial. We can provide image data within a few hours after the rush activation and deliver them via FTP.

Slide background
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deimos-2
deimos-1
applications
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stations
distributors
ordering
imagery

deimos-1
medium resolution, 650-km wide swath
22-m multispectral imagery

pangeo
alliance

DEIMOS-1 is a Medium Resolution, 650-km wide swath, 3 bands satellite providing 22-m imagery.

Bands Spectral Range (nm) Spatial Resolution (m)
Green 520 – 600 22
Red 630 – 690 22
NIR 770 – 900 22

Table 1: DEIMOS-1 Sensor’s Features

Its three spectral bands (R, G, NIR) are similar to those of Landsat missions, ensuring continuity with existing tools and harmonization with historical data. A synthetic blue band can also be generated to produce natural-color imagery.

Radiometric Resolution 8 or 10 bits
Swath 650 Km
Revisit time 3-day worldwide
System Capacity 5,000,000 km/2 daily

Table 2: DEIMOS-1 Characteristics

Processing Levels

DEIMOS-1 products are available at different processing levels:

Product Description
L1R Basic Geopositioned product
L1T L1R data Orthorectified to sub-pixel accuracy (10 meters RMS error)

Table 3: DEIMOS-1 Products

The L1T products are delivered using UTM/WGS84 projection by default. Alternatively, it is possible to orthorectify DEIMOS-1 images to any projection using reference imagery and DEM datasets supplied by the customer.

L1R L1T (R-G-NIR) L1T (R-G-B)

Table 4: Example of DEIMOS-1 data

FILE FORMAT

DEIMOS-1 products are provided in DIMAP format. It consist of two parts, one for the image and the other for a description of the image (Metadata). The image products for DEIMOS-1 are provided by default in GeoTIFF. Other formats are also available such as jpg, dim, html and tif.

DELIVERY METHODS

Deimos Imaging offers a wide variety of delivery methods for DEIMOS-1 products, which can be adapted to Customer’s requirements.Usually, products are delivered via FTP Pull, being placed in an FTP hosted by Deimos Imaging. On Customer’s request, data can be delivered via FTP Push (i.e. on an FTP set up by the Customer), or via a physical mean sent by courier (USB stick, hard disk or DVD).

24/7 end-to-end service

Rush tasking orders for DEIMOS-1 images are accepted in support of emergency events, global security, maritime surveillance and various other applications in which fast delivery of satellite data is crucial. We can provide image data within a few hours after the rush activation and deliver them via FTP.