Maine Orthoimagery Coastal Central Coast 2001 (Imagery Layer)

Tile Download Link Color infrared, 0.3 meter ground sample distance (GSD) , high resolution digital orthophotographs produced from aerial photos collected over the Maine coastline in the Fall of 2001 and 2002. Each pixel represents a planimetric square 0.3 meter on a side on the ground. Aerial photography was flown at 1,830 meters above mean ground level. The aerial imagery was georeferenced using 2D rectification methedology utilizing cubic convolution resampling and a minumum of 4 ground control points (GCP's). The digital orthorectified images are referenced to North American Datum 1983, UTM Zone 19, expressed in units of meters. The completed orthorectified TIFF and MG3 MrSid files represent Digital Ortho Quarter Quads (DOQQ) sized tiles. Imagery tiles provide complete coverage of the Maine Department of Marine Resources boundaries as defined by the project.瓦片下载链接：本数据集为彩色红外（Color Infrared）高分辨率数字正射影像（digital orthophotographs），地面采样距离（ground sample distance, GSD）为0.3米，数据来源于2001年与2002年秋季在缅因州海岸线区域采集的航空照片。每个像素对应地面上边长为0.3米的平面正方形区域。航空摄影的飞行高度为平均地面高程以上1830米。航空影像采用二维纠正方法进行地理配准，该方法使用三次卷积重采样，且至少需要4个地面控制点（ground control points, GCPs）。本数字正射影像采用1983北美大地基准面（North American Datum 1983），投影为通用横轴墨卡托投影第19带（UTM Zone 19），坐标单位为米。最终生成的正射校正文件包含TIFF与MG3 MrSid两种格式，均为符合数字正射四分图幅（Digital Ortho Quarter Quads, DOQQ）规格的瓦片。所有影像瓦片完整覆盖了本项目划定的缅因州海洋资源部（Maine Department of Marine Resources）管辖范围。