GPS World

Tag: orthoimage

  • USDA aerial maps transitioning to new URLs

    As part of The National Map transition to cloud hosting, several of the National Map Orthoimagery Services will be provided under new URLs by early December.

    One major change involves links to USDA National Aerial Imagery Program (NAIP) orthoimagery. These new URLs have been available and running in parallel for many months and most applications have already made the change to the new replacement services.

    In addition, as part of this transition, USGS legacy Digital Raster Graphic (DRG) or Scanned Map service will also be retired.

    Orthimage of Glenn Canyon Dam, Arizona, taken Oct. 31, 2016. (USGS)
    Orthimage of Glenn Canyon Dam, Arizona, taken Oct. 31, 2016. (USGS)

    The National Map uses NAIP imagery as a key component of its US Topo map products. As part of this service, it also provides imagery compressed files for download and imagery web map services for visualization in applications. These imagery services and data download provide an imagery base that supplements the associated US Topo GIS-based product: the Topo Map Vector Data Product.

    The imagery web map services or imagery downloaded from TNM Downloader may both be used along with TNM vector products in the Topo TNM Style Template, providing GIS basemap layers and data in the cartographic style and layout of the US Topo maps.

    These dynamic imagery services are designed to provide visualization from local to national scales for a variety of use cases. The replacement “Imagery – 1 meter (plus)” service will contain NAIP orthoimagery along with other High Resolution Orthoimagery (HRO) to fill in areas where NAIP is not flown.

    Some of the services are scale-dependent, drawing only at the largest scales (below 18K scale), to facilitate zooming in past the levels currently supported in the faster USGS tile cached Imagery Basemap service. These capabilities are being maintained through the new URLs listed on the transition page.

  • CompassData Certified by FAA to Collect Data for Aviation Mapping

    CompassData, a worldwide provider of geospatial data and services, has received DO-200A certification by the Federal Aviation Administration (FAA) for collection and processing of survey and ground control data used in the creation of Airport Mapping Database (AMDB) products.

    “DO-200A certification enables CompassData to provide Ground Control Points (GCPs) for generation of digital aeronautical products, such as Airport Moving Maps, used by pilots in the cockpit to navigate on the ground at airports worldwide,” said Hayden Howard, CompassData Vice President. “This certification applies to custom ground control collects and to many of the GCPs that exist in our worldwide archive available off the shelf for immediate purchase.”

    In addition, CompassData has been approved to use its GCPs and Accuracy Analyst map tool to verify the accuracy of satellite or aerial imagery used in creation of AMDB DO-272C aviation products. This means CompassData may orthorectify a high-resolution DigitalGlobe satellite image, verify that the orthoimage accuracy meets sub one- and five-meter specifications, and provide the image to an aeronautical mapping firm or avionics system developer to generate commercial products.

    DO-200A standards were developed by FAA to assure the quality of data used in the preparation of aeronautical mapping, navigation and situational awareness products and systems. Prior to certification, CompassData completed a rigorous examination procedure in which FAA reviewed every step in the firm’s methodologies for collecting, processing and managing GPS-surveyed ground control to ensure the data is accurate, timely, complete, and traceable.

    FAA has granted only six LOAs (Letters of Acceptance) in the Denver ACO Region and only 24 globally. CompassData is the first in the world to receive certification for verification of data sets used to create Airport Moving Map data.

    In March, CompassData purchased the assets of Spatial Information Solutions (SIS) in Starkville, Mississippi, and announced the continued sale and support of the popular Accuracy Analyst and Topo Analyst Map Accuracy Tools. These software applications are relied upon by geospatial end users to automatically verify the accuracy of orthoimagery and digital elevation data sets, often with CompassData GCPs.

    CompassData will discuss the FAA DO-200A certification and demonstrate Accuracy Analyst and Topo Analyst Map Accuracy Tools in booth #2063 at GEOINT 13* being held April 14-17, 2014, in Tampa, Florida.