Delaware Valley Regional Planning Commission
Aerial survey of the 5-county, Pennsylvania portion DVRPC’s region. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. This project consists of the creation of 3-band, 24 bit color digital orthophoto tiles for the 5-county, Pennsylvania portion DVRPC’s region utilizing a Leica ADS40 digital imaging system. The tiles were delivered in both GeoTIFF and MrSID MG3 formats. A GeoTIFF is a TIFF file which has geographic (or cartographic) data embedded as tags within the TIFF file. The geographic data can then be used to position the image in the correct location and geometry within a geographic information system (GIS) display. MrSID (Multi-resolution Seamless Image Database) is a proprietary, wavelet-based, image compression file format (*.sid) developed and patented by LizardTech, Inc. A 20:1 compresssion ratio was used for the MrSIDs. The complete data set contains 1,540 full ortho tiles in Pennsylvania State Plane South coordinate system, NAD83. The individual tiles measure 5,055′ x 8,745′ at a 1.0′ pixel size. There is no image overlap between adjacent tiles. Orthoimagery processed by BAE Systems.
Pennsylvania Spatial Data Access (PASDA)
Delaware Valley Regional Planning Commission
Horizontal Positional Accuracy
The horizontal accuracy standard follows the NSSDA-1998 standard. The maximum permissible RMSE for 95% of the horizontal check points for the mapping product is 5 feet or better.
The Delaware Valley Regional Planning Commission (DVRPC) excludes any and all implied warranties of merchantability and fitness. No guarantees are expressed or implied as to the use or application of the digital information supplied. DVRPC assumes no responsibility to maintain them in any manner or form. DVRPC will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the material supplied, or arising out of any inaccuracy or defect in the digital information supplied. Recipients of DVRPC digital files are not entitled to any file revisions, updates, corrections, or new releases. Recipients of DVRPC digital files are expressly prohibited from copying or releasing these files to any other individuals or agencies, under any circumstances. Recipients of DVRPC digital files are expressly prohibited from displaying for view or making these files available for download from the Internet or World Wide Web, under any circumstances. Recipients of DVRPC digital files will credit DVRPC as the source of the data when producing maps, publications, reports, or other documents that utilize DVRPC files.
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