Baltimore City/County DOQs

Color Infrared Digital Orthophoto Quarter Quadrangles (CIR-DOQQs) for Baltimore City and Baltimore County. The originals were produced at one-meter resolution to meet the National Map Accuracy Standard (NMAS) at 1:12,000 scale. The originals were resampled to a four-meter resolution. This metadata descirbes this resampled four-meter resolution files. The originals file-sizes are in the range of 28 megabytes to 50 megabytes. This resampling reduces the file-size to facilitate easier downloads via the World Wide Web. The resampling also has the added advantage of reorienting the pixels to remove the rotational factor that was inherent in the original files. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The original CIR-DOQQs mapped a 1-meter ground resolution of a DOQQ (a 3.75-minutes of latitude by 3.75-minutes of longitude extent) plus the overedge ranging from about 50 meters to 300 meters. The overedge is included to facilitate tonal matching for mosaicking The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of lines fom north to south. The DOQQs are an 8-bit composite raster with radiometric image brightness values stored as 256 levels, from 0 to 255. This is part of a collection of 221 Baltimore Ecosystem Study metadata records that point to a geodatabase. The geodatabase is available online and is considerably large. Upon request, and under certain arrangements, it can be shipped on media, such as a usb hard drive. The geodatabase is roughly 51.4 Gb in size, consisting of 4,914 files in 160 folders. Although this metadata record and the others like it are not rich with attributes, it is nonetheless made available because the data that it represents could be indeed useful. This is part of a collection of 221 Baltimore Ecosystem Study metadata records that point to a geodatabase. The geodatabase is available online and is considerably large. Upon request, and under certain arrangements, it can be shipped on media, such as a usb hard drive. The geodatabase is roughly 51.4 Gb in size, consisting of 4,914 files in 160 folders. Although this metadata record and the others like it are not rich with attributes, it is nonetheless made available because the data that it represents could be indeed useful.