Orthophoto imagery 2013

An orthophoto is an aerial photograph that has been processed (via a scanning and rectification process) in such a way as to eliminate image displacement due to camera tilt and terrain relief, so that it represents every object as if viewed directly from above, as in a map which is usually in an orthographic projection. An orthophoto combines the visual properties of a photograph with the geometric qualities of a map and offers a realistic visualization of the landscape. The City's orthophoto coverage includes the City, UBC, and the University Endowment Lands and parts of Richmond and the Vancouver International Airport (YVR) as well. The 2013 orthophotos are our highest resolution imagery to date (7.5 cm). These were acquired as part of the Pictometry image collection. Their quality, colour, sharpness, and positional accuracy are very high. Data currency The 2013 orthophotos were captured on April 16 and 24, 2013. This imagery is captured at one point in time and is current as of that date but it does not change. Data accuracyImagery is accurate as of the date it was taken although colours may or may not be exactly as occurred on that day as colours change from moment to moment due to sun and cloud cover.

正射影像是指通过扫描和校正等处理过程，消除因相机倾斜和地形起伏导致的图像位移，从而使得图像上的每个物体都仿佛直接从上方俯瞰，如同通常采用正射投影的地图一般。正射影像融合了摄影的视觉特性与地图的几何品质，提供了对景观的逼真可视化。本市的正射影像覆盖范围包括市区、不列颠哥伦比亚大学、大学捐赠地以及部分列治文和温哥华国际机场（YVR）区域。2013年的正射影像为我们迄今为止分辨率最高的影像资料（7.5厘米）。这些影像作为Pictometry影像集合的一部分被获取。其品质、色彩、清晰度以及定位精度均极高。数据时效性2013年的正射影像拍摄于2013年4月16日和24日。这些影像记录了某一特定时间点的图像，并自该日期起保持时效性，但不会随时间而改变。数据准确性影像的准确性以拍摄日期为准，尽管颜色可能并不完全与当日实际发生的情况相符，因为颜色会因阳光和云层的覆盖而随时间变化。