I. Overview
Jiangxi, China's provincial administrative region, referred to as "Gan" (gàn), also known as Jiangyou, also known as Ganpo land, the provincial capital is Nanchang. The name of the province is due to the establishment of the Jiangnan West Road by Emperor Xuanzong of the Tang Dynasty in AD 733. It is also referred to as Gan River because it was a dry land in ancient times and the largest river in the province was the Gan River.
Jiangxi's red culture is famous at home and abroad, Jinggangshan is the cradle of the Chinese revolution, Nanchang is the birthplace of the Chinese People's Liberation Army, Ruijin is the place where the Soviet Central Government was established, and Anyuan is the birthplace of the Chinese labor movement. The Communist Party of China led the people to establish large revolutionary bases in Jiangxi successively: the Jinggangshan Revolutionary Base in Western Jiangxi, the Hunan-Jiangxi Revolutionary Base, and the Northeast Jiangxi Revolutionary Base.
In 291 AD, Jiangzhou was established, and the administrative office was Nanchang. Later, it was moved to Xunyang County (Jiujiang City), and its main body was the original county in Jiangxi. During the Sui Dynasty, administrative divisions were adjusted, and the state level was lowered to the same level as the county. Therefore, there were 7 counties and 24 counties in the Jiangxi region of the Sui Dynasty. By the Tang Dynasty, it had increased to 37 counties in 8 states. In the first year of Emperor Taizong of Tang Dynasty (627), the whole country was divided into 10 supervision areas, and Jiangxi belonged to Jiangnan Road. In the 21st year (733) of Emperor Xuanzong's reign in the Tang Dynasty, it was increased to 15 roads, which belonged to Jiangnan West Road.
2. How to download Google Earth elevation DEM data in Jiangxi Province?
The offline data package of the DEM contour line of Google Earth in Jiangxi Province is 235.7M, which can be downloaded directly from the Baidu network disk.
The download address is:
https://pan.baidu.com/s/1Sm3e8yDHIEVcsq_-4mZAAQ
The decompressed directory mainly includes the Google Earth Elevation DEM Data.dat of Jiangxi Province, the Google Earth Elevation DEM Data of Jiangxi Province.idx, and the Google Earth Elevation DEM Data of Jiangxi Province.kml.
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 Jiangxi Province
The administrative division of Google Earth elevation DEM data in Jiangxi Province mainly includes 11 cities with districts (Nanchang City, Jiujiang City, Shangrao City, Fuzhou City, Yichun City, Ji'an City, Ganzhou City, Jingdezhen City, Pingxiang City, Xinyu City, Yingtan City ).
How to export Google Earth elevation DEM data as TIF files in Jiangxi 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“江西省谷歌地球高程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，可以将下载的江西省谷歌地球高程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。
在将江西省谷歌地球高程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。
需要将江西省谷歌地球高程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、江西省谷歌地球高程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“江西省谷歌地球高程DEM数据.tif”文件拖放到GlobalMapper中即可打开，效果如下图所示。
江西省谷歌地球高程DEM数据局部放大之后，效果如下图所示。
五、江西省谷歌地球高程DEM数据如何提取10米等高线？
江西省谷歌地球高程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 Jiangxi 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