Waterford2015

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MrSID file was derived from the 2015 raster dataset, which consists of 8-bit,
4-band (R, G, B, NIR) color orthoimagery. A digital orthoimage is a raster
image processed from vertical aerial images in which displacement in the image
due to sensor orientation and terrain relief have been removed. Orthoimagery
combines the image characteristics of an image with the geometric qualities of
a map. Unlike planimetric maps which depict natural and manmade features by
means of lines, point symbols, texts and polygons, orthoimagery illustrates the
actual images of features and are thus more easily interpreted than regular
maps. The normal orientation of data in an orthoimage is by lines (rows) and
samples (columns). Each line contains a series of pixels ordered from west to
east with the order of the lines from north to south. Each image tile is stored
in industry standard TIFF (tagged interchange file format) with an associated
TIFF world file. Aerial imagery was acquired between April 12 and 15 2015 from
flying heights of approximately 1400-1640 feet above ground level (AGL). Each
orthoimage tile is 2500feet X 2500feet in dimension, edge-tied with the
adjacent tiles (no gap and no overlap). This dataset is published in
NAD_1983_HARN_StatePlane_Michigan_South_FIPS_2111_Feet_Intl_feet.</span>

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本MrSID（多分辨率无缝图像数据库，Multiresolution Seamless Image Database, MrSID）文件源自2015年栅格数据集，该数据集包含8位、4波段（红、绿、蓝、近红外（Near Infrared, NIR））彩色正射影像（Orthoimagery）。数字正射影像是由垂直航空影像经处理得到的栅格图像，该处理过程已移除因传感器姿态与地形起伏导致的影像位移。正射影像兼具影像的图像特征与地图的几何属性。与通过线条、点符号、文字与多边形来表示自然及人造地物的平面地图不同，正射影像直接呈现地物的真实影像，因此比常规地图更易于判读。正射影像中的数据通常以行与列的形式组织：每一行包含一系列从西向东排列的像素，而行的排布顺序则是从北向南。每幅影像瓦片均采用行业标准TIFF（标签图像文件格式，Tagged Interchange File Format, TIFF）存储，并附带对应的TIFF世界文件。航空影像采集于2015年4月12日至15日期间，飞行高度约为离地1400至1640英尺（AGL，Above Ground Level）。每幅正射影像瓦片的尺寸为2500英尺×2500英尺，与相邻瓦片边缘无缝衔接（无间隙、无重叠）。本数据集采用NAD_1983_HARN_StatePlane_Michigan_South_FIPS_2111_Feet_Intl_feet坐标系发布。