基于GeoTIFF的航海雷达图像的生成

Marine radar image generation based on GeoTIFF

为模拟真实感更强的航海雷达图像,建立带有完备高程信息的数字高程模型(Digital Ele-vation Model,DEM),以GeoTIFF文件作为新的高程信息源,研究航海雷达模拟器的图像生成方法.通过解析GeoTIFF文件获取高程信息,然后将其从地理空间转换到带DEM的栅格空间;将高程值和像素值对应起来,重新生成一幅图像.对每一根扫描线上详细的高程信息进行遮挡判断,并充分考虑雷达脉冲宽度产生的距离分辨力.仿真结果表明,采用GeoTIFF文件作为高程信息源比传统的电子海图获取的高程信息更完备,模拟的图像真实感也有所改善.

In order to simulate more realistic marine radar images, and found Digital Elevation Model （DEM） with complete elevation information, the image generation method for the marine radar simulator is studied with GeoTIFF files serving as a new source of elevation information. The elevation information is obtained through the analysis of GeoTIFF files, and then converted to raster space with DEM from geo- graphical space. The elevation value is assigned to pixel values to re-generate a new image. The shading judgement is conducted for elevation information in details along each scan line, and full consideration is given to the range resolution generated by the pulse width of rea] radar. The simulation results show that more complete elevation information can be obtained by GeoTIFF files as elevation source of inibrmation than by the traditional electronic charts, and simulation realism of the image is also improved.