GeoCover Ortho Landsat Products
Landsat scenes used to create the GeoCover-Ortho products have been hand selected to provide the lowest cloud cover and highest quality data.
In August of 1998, NASA contracted with MDA to produce positionally accurate orthorectified Landsat TM and MSS imagery covering the majority of the Earth's land mass. Landsat digital imagery has long held the promise of providing a geodetically accurate image map of the Earth. With the advent of MDA's GeoCover-Ortho initiative, that promise has become a reality.
The Landsat scenes used to create the GeoCover-Ortho products have been hand selected to provide the lowest cloud cover and highest quality data possible. The Landsat TM imagery are all circa 1990 and have been selected as close to the local peak growing season as possible. The imagery have been collected from the majority of the Landsat foreign ground stations, as well as from the US Government's EROS Data Center. MDA's Landsat photogrammetric approach combines the world's best available horizontal and vertical control with detailed manually measured tie points between adjacent imagery to create a highly accurate spatial relationship between the raw Landsat imagery and the surface of the Earth.
Using high speed computers, this relationship is used to correct the geometry of the raw Landsat imagery so that it creates a detailed map with a positional accuracy of 50 meters RMS. The combination of the highly accurate control (both positional and elevation control) and the unique capabilities of MDA's patented photogrammetric software imparts on the GeoCover-Ortho image products a geodetic positional accuracy that is better than the vast majority of the world's 1:200,000 scale maps. MDA accepts the follwing as payment for any of our image products:
- American Express
Stock GeoCover Ortho Products
Stock Scenes are individual Landsat scenes covering an area of approximately 170x170 kilometers at a spatial resolution of 28.5 meters. Stock Scene data sets are comprised of all seven Landsat spectral bands and are in a UTM (Universal Transverse Mercator) map projection with a geodetic accuracy of better than 50 meters RMS.
Stock Mosaics are digital mosaics of up to fifteen (15) Landsat scenes covering a five (5) degree (north-south) segment of a standard, six (6) degrees (east-west), UTM partition. The mosaics are contrast enhanced color image data products comprised of Landsat TM bands 7,4,2 composited in red, green, and blue, respectively. The imagery have a spatial resolution of 28.5 meters and are in a UTM (Universal Transverse Mercator) map projection with a geodetic accuracy of better than 50 meters RMS.
Regional Mosaics are large area (small scale) mosaics of up to 1200+ Landsat scenes. The mosaics are contrast enhanced color image data products typically comprised of Landsat TM bands 7,4,2 composited in red, green, and blue, respectively. The imagery has a spatial resolution commensurate with the scale of the final digital mosaic, but usually range between 90 and 150 meters. The map projections of Regional Mosaics vary and are determined by the conventions for the areas being covered. Click on any of the following to enlarge:
The following regional mosaics are available now:
- USA (Contiguous 48 states)
- Central America
- Northern Africa
- Middle East
- North East Asia (Planned)
Custom GeoCover Ortho Scenes/Custom Mosaics
Custom Projections - Individual Scenes
Custom Ortho scenes are GeoCover-Ortho imagery reprojected to a customer-specified projection, datum, and pixel size. See Pricing Information
Custom Mosaics are full resolution digital mosaics of either GeoCover-Ortho Stock or Custom Projected imagery over a user specified area, using user specified pixel size and spectral band combination. See Pricing Information
Custom Regional Mosaics
Custom Regional mosaics, at reduced resolution, are also available. Contact customer service for pricing.