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hdzw2012实习版主
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求助帮下载这里的地形数据：http://www.ngdc.noaa.gov/mgg/fliers/globedem.html 已有1人参与
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求帮下载这里的地形数据：http://www.ngdc.noaa.gov/mgg/fliers/globedem.html 如果有其他的同样规格的数据也可提供。 We use three terrain models which are obtained from the SRTM ftp site [16]. All models represent a real-world terrain and all of them have a grid sampling interval of 5 meters. [16] Global Land One-km Base Elevation. Retrieved December, 2007, http://www.ngdc.noaa.gov/mgg/fliers/globedem.html. The first terrain model is named Smooth since it has fewer obstacles and is smoother when compared to the other two models. The data for this model was taken from the surroundings of Encanto Golf Park, near Phoenix, USA. This terrain model was extracted from inside of a virtual rectangle formed by two points whose global coordinates are (33°28'44.27" N, 112°05'25.86"W) and (33°28'25.08" N, 112°05'05.01" W). The screenshot of this terrain model is given in figure 6. The second terrain model is named Wavy, this model is more uneven when compared to the previous one and as its name suggests. The model was extracted from inside of a virtual rectangle formed by two points whose global coordinates are (37°06'44.48" N, 30°25'14.11" W) and (37°10'41.32" N, 30°33'14.09" W). The location was chosen from Antalya, Turkey.The terrain looks like as shown in Figure 7. The last terrain Rough, is also extracted from a region nearby Encanto Park, Phoenix and is shown in Figure 8. Terrain models are square-shaped and there are 201 points on the x-axis and 201 on the y-axis. The distance between consecutive two points is equal to 5 meters which means that all of the terrain models have dimensions of 1 km × 1 km. [16] Global Land One-km Base Elevation. Retrieved December, 2007, http://www.ngdc.noaa.gov/mgg/fliers/globedem.html.  6.png  7.png  8.png [ Last edited by hdzw2012 on 2014-10-2 at 21:42 ] |
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edwardted
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hdzw2012: 金币+1 2014-10-03 07:03:51
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hdzw2012: 金币+1 2014-10-03 07:03:51
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Why do you want to use HyDROSheds (90m, 500m and 1km)? http://hydrosheds.cr.usgs.gov/index.php HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales) HydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced data sets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on high-resolution elevation data obtained during a Space Shuttle flight for NASA's Shuttle Radar Topography Mission (SRTM). |
2楼2014-10-02 23:48:35
3楼2014-10-03 06:53:39
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4楼2014-10-03 08:38:24
