Basic 1B Imagery (Level 1)

Basic Imagery products are the least processed of the WorldView-1 Imagery Products. Each strip in a Basic Imagery order is processed individually; therefore, multi-strip Basic Imagery products are not mosaicked.

Basic Imagery products are radiometrically corrected and sensor corrected, but not projected to a plane using a map projection or datum. The resulting GSD varies over the entire product because the attitude & ephemeris change during the imaging process.

Basic Imagery products are delivered at full swath width, cut into 14km lengths. Full strip width is 17.6 km at nadir; the area that this width represents on the ground depends on the collection parameters (off-nadir angle, orientation of collection, etc).

Basic Stereo Pairs (Level 1)

Basic Stereo Pairs are supplied as two full scenes (490 km2) with 90% overlap, designed for the creation of DEMs and derived GCPs.

Standard 2A (Level 2)

Standard Imagery products are processed to a further extent than Basic Imagery. They are more suitable for users that require imagery in a familiar ground-based coordinate system (such as UTM Zone or State Plane).

Standard Imagery products are radiometrically corrected, sensor corrected, and projected to a plane using the map projection and datum of the customer’s choice.

All Standard Imagery products have uniform GSD throughout the entire product. If the order polygon crosses more than one strip, one product is made for each image strip that is used to fulfill the order. As the Standard Product is not mosaicked, one product will be delivered for each strip.

Standard Imagery has a coarse DEM applied to it, which is used to correct for topographic relief with respect to the reference ellipsoid. The degree of normalization is relatively small, so while this product has terrain corrections, it is not considered orthorectified.

Ortho Ready Standard OR2A (Level 2)

Ortho Ready Standard Imagery has no topographic relief applied, making it suitable for custom orthorectification. Ortho Ready Standard Imagery is projected to an average elevation, either calculated from a terrain elevation model or supplied by the customer. It can be ordered from a minimum of 25 km² from the Library, or from 64 km² for new tasking.

Orthorectified (Level 3)

Orthorectified Imagery products are GIS-ready and are used as image base maps for a wide variety of applications that require a higher degree of absolute accuracy.

Orthorectified Imagery products are radiometrically corrected, sensor corrected, and orthorectified with a fine digital terrain model using the map projection and datum requested by the customer. For order polygons that require more than 1 strip, customers have the option to have their products mosaicked into a single product.

Orthorectified Imagery products require DEMs to remove relief displacement. Ground Control Points (GCPs) can also be used to improve the absolute accuracy.

The delivered area for Orthorectified Products is the order polygon is black-filled to the Minimum Bounding Rectangle.

Ortho product accuracy:

Ortho 1:12,000 10.2-meters CE90, 6.2 meters RMSE

Custom Orthorectified

These products use customer-provided support data to orthorectify WorldView-1 Imagery. There is no stated accuracy associated with the Custom Orthorectified Imagery product because the quality and accuracy of the finished product is directly dependent on the quality and accuracy of the support data.