OC 2008 Intensity ImageService

<div>BY USING THIS WEBSITE OR THE CONTENT THEREIN, YOU AGREE TO THE <u><a href='https://www.oakgov.com/open-data-terms' rel='nofollow ugc'>TERMS OF USE</a></u><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size:17px;'>. </span><br /></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size:17px;'><br /></span></div>Intensity raster product derived from the 2008 LiDAR data set. The average intensity value (range 0-255) within each raster cell is calculated and assigned as the pixel value. The resultant rasters are 1-byte, single-band with a pixel size of 1 meter (3.28 ft). Each raster was clipped to the LiDAR production tile index with a 1-pixel over-edge. LIDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. Using a combination of laser range finding, GPS positioning and inertial measurement technologies; LIDAR instruments are able to make highly detailed Digital Elevation Models (DEM) of the earth's terrain, man-made structures and vegetation. This data was collected at a resolution to aid in flood plain analysis and mapping.<div><br /><div>These data represent the individual surface returns created by laser energy from the LiDAR sensor reflected from the first surface encountered by the laser pulse. Some energy may continue beyond this initial surface to be reflected by a subsequent surface as represented by the Last Return data. Intensity information is captured from the Reflective Surface pulse and indicates the relative energy returned to the sensor as compared to the energy transmitted. The Intensity image is not calibrated or normalized but indicates differences in energy absorption due to the interaction of the surface materials with laser energy at the wavelength transmitted by the sensor. Points are classified as water, bare ground or not bare ground to support creation of a bare earth model from the data.</div></div>访问本网站或使用其中所载内容，即视为您同意<a href="https://www.oakgov.com/open-data-terms" rel="nofollow ugc">使用条款</a>。 本数据集为基于2008年激光雷达（LiDAR）数据集生成的强度栅格产品。本产品将每个栅格单元内的平均强度值（取值范围0-255）计算得出并赋值为像素值。生成的栅格为单波段1字节格式，像素分辨率为1米（3.28英尺）。所有栅格均按照激光雷达生产瓦片索引进行裁切，边缘预留1个像素的溢出范围。 激光雷达数据是由机载采集平台获取的遥感高分辨率高程数据。该技术结合激光测距、全球定位系统（GPS）与惯性测量技术，可生成精度极高的地球地形、人工构筑物及植被的数字高程模型（Digital Elevation Model，DEM）。本数据的采集分辨率适配于洪泛区分析与制图工作。 本数据对应激光脉冲首次遇到地表时，激光雷达传感器接收的激光能量产生的单次地表回波。部分能量可能穿透初始地表，被后续地表反射，对应“末次回波（Last Return）”数据。强度信息采集自首次反射的激光脉冲，用于表征传感器接收到的反射能量与发射能量的相对比值。本强度影像未经过校准或归一化，仅可体现地表物质与传感器发射波长的激光相互作用时产生的能量吸收差异。数据点被划分为水体、裸地或非裸地三类，以支持裸地模型的构建。