I. Overview
Guizhou Province, referred to as "Qian" or "Gui" for short, is located in the hinterland of southwest China, bordering Chongqing, Sichuan, Hunan, Yunnan and Guangxi. It is a transportation hub in southwest China. It is a world-renowned mountain tourism destination and a major mountain tourism province, the country's first national-level big data comprehensive experimental area, a national ecological civilization experimental area, and an inland open economic experimental area.
The terrain in Guizhou is high in the west and low in the east. It slopes from the central part to the north, east and south. The landforms of the province can be roughly divided into four basic types: plateau, mountain, hill and basin. It is the only province in the country without plain support. It is a subtropical humid monsoon climate, with four distinct seasons, warm spring breeze, abundant rainfall, and rain and heat in the same period.
Guizhou is one of the birthplaces of ancient humans, and many ancient human fossils and ancient cultural relics have been discovered. As early as 240,000 years ago, humans inhabited and reproduced, and more than 80 Stone Age cultural sites have been discovered. The Guanyin Cave Paleolithic site was officially named "Guanyin Cave Culture", which has important scientific value for studying the origin and development of China's Paleolithic Age.
2. How to download Google Earth elevation DEM data in Guizhou Province?
The offline data package of the Google Earth Elevation DEM contour line in Guizhou Province is 344.8MB, which can be downloaded directly from the Baidu network disk.
The download address is:
https://pan.baidu.com/s/11B8Qk4oh6re9xjyEieAv2A
The decompressed directory mainly includes the Google Earth Elevation DEM Data .dat of Guizhou Province, the Google Earth Elevation DEM Data .idx of Guizhou Province and the Google Earth Elevation DEM Data of Guizhou Province .kml files.
Double-click the shortcut of "Google Earth Elevation Data Reading and Exporting Tool" to download "Shuijingzhu Universal Map Downloader" for exporting elevation data as TIF files.
3. Administrative divisions of counties and cities included in the Google Earth elevation DEM data in Guizhou Province
The administrative division of Google Earth elevation DEM data in Guizhou Province mainly includes Guiyang City, Zunyi City, Liupanshui City, Anshun City, Bijie City, Tongren City, Qianxinan Buyi and Miao Autonomous Prefecture, Qiandongnan Miao and Dong Autonomous Prefecture, and Qiannan Buyi and Miao Autonomous Prefecture.
How to export Google Earth elevation DEM data as TIF files in Guizhou Province?
After downloading and installing the universal map downloader and launching it, click "Task List" to open the download task list.
In the download task list, click the "Import" button to display the file selection dialog.
在文件选择对话框中，可以选择需要导入的“贵州省谷歌地球高程DEM数据.dat”文件。
单击列表中的文件名称，可以查看所有图片的瓦片映射点，可以查看数据的完整性。有数据为绿色点，无数据为蓝色点，点击“查看结果”按钮可以预览查看高程DEM数据的渲染效果图。
移动鼠标到需要导出的影像名称上方，点击显示的“导出”按钮会显示“导出设置”对话框，可以将下载的贵州省谷歌地球高程DEM数据拼接为大图，也可以导出为Cesium开源三维地球的高程DEM瓦片数据。
在将贵州省谷歌地球高程DEM数据导出拼接为大图时，可以很方便地设置导出文件存储格式、坐标投影和设置背景透明等。同时，支持导出西安80、北京54和WGS84等多种平面坐标投影方式。
这里将坐标投影选择为“西安80高斯投影”、文件保存格式为“GeoTIF(*.tif)”、背景设置为透明，且勾选按边界范围剪裁等相关参数。设置完成之后，点击“确定”会导出下载结果。
需要将贵州省谷歌地球高程DEM数据导出为CESIUM开源三维地球瓦片时，只需要选择“导出瓦片”功能项，然后选择瓦片格式为“高程CES瓦片”即可。
四、贵州省谷歌地球高程DEM数据如何打开查看？
谷歌地球高程DEM数据需要在专业软件中才可以进行打开查看，如GlolbalMapper或ArcGIS等,这里以GlobalMapper为例。在导出结果目录中，将“贵州省谷歌地球高程DEM数据.tif”文件拖放到GlobalMapper中即可打开，效果如下图所示。
贵州省谷歌地球高程DEM数据局部放大之后，效果如下图所示。
五、贵州省谷歌地球高程DEM数据如何提取10米等高线？
贵州省谷歌地球高程DEM数据如何提取10米等高线的方法，请参阅官网教程：
六、结语
To sum up, the offline package of Google Earth elevation DEM data in Guizhou Province directly downloaded from Baidu's network disk can be exported as a TIF elevation file in Xi'an 80 or Beijing 54 coordinate system through the universal map downloader according to actual application requirements.
The TIF elevation DEM file exported by the universal map downloader can also be used to extract contour lines or generate 3D terrain through professional software such as GlobalMapper or ArcGIS, which is suitable for 3D simulation, 3D terrain modeling or construction of virtual 3D scenes and other applications.
For related documentation tutorials, see:
GlobalMapper cracked Chinese version download and install graphic tutorials