I. Overview
Jilin, located in the central part of Northeast China and the geographic center of Northeast Asia, was named after the construction of Jilin Wula City in the early Qing Dynasty, referred to as "Ji", the provincial capital Changchun, the original provincial capital Jilin City. The ground spans between 121°38′～131°19′ east longitude and 40°50′～46°19′ north latitude. It is 769.62 kilometers long from east to west, 606.57 kilometers wide from north to south, and has a land area of 187,400 square kilometers, accounting for 2% of the country's area.
Jilin Province is located in the geometric center of Northeast Asia consisting of Japan, Russia, North Korea, South Korea, Mongolia and northeastern China. It borders Heilongjiang Province to the north, Liaoning Province to the south, Inner Mongolia Autonomous Region to the west, the Russian Federation to the east, and North Korea across the river to the southeast.
Jilin Province has obvious differences in geomorphology. The terrain slopes from southeast to northwest, showing obvious characteristics of high southeast and low northwest. With the central Daheishan as the boundary, it can be divided into two major landform areas: the eastern mountains and the central and western plains. The eastern mountains are divided into the Changbai Mountains, the middle and low mountains and the low hilly areas, and the central and western plains are divided into the central plateau plains and the western meadows, lakes, wetlands, and sandy areas. The types of landforms are mainly composed of volcanic landforms, erosion and denudation landforms, alluvial-proluvial landforms and alluvial plain landforms.
2. How to download Google Earth elevation DEM data in Jilin Province?
The offline data package of the Google Earth Elevation DEM contour line in Jilin Province is 211.34MB, which can be downloaded directly from the Baidu network disk.
The download address is:
https://pan.baidu.com/s/167dzUDg5mdS3xTzA5HiQaw
The decompressed directory mainly includes the Google Earth Elevation DEM Data .dat of Jilin Province, the Google Earth Elevation DEM Data .idx of Jilin Province and the Google Earth Elevation DEM Data .kml of Jilin Province.
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 of Jilin Province
The administrative division of Google Earth elevation DEM data in Jilin Province mainly includes Changchun City (sub-provincial city) and Jilin City (larger city), Siping City, Tonghua City, Baishan City, Liaoyuan City, Baicheng City, Songyuan City8 1 prefecture-level city and 1 autonomous prefecture in Yanbian Korean Autonomous Prefecture.
How to export Google Earth elevation DEM data as TIF files in Jilin Province?
After downloading and installing the universal map downloader and launching it, click "Task List" to open the download task list.
在下载任务列表中，点击“导入”按钮，会显示文件选择对话框。
在文件选择对话框中，可以选择需要导入的“吉林省谷歌地球高程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，可以将下载的吉林省谷歌地球高程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。
在将吉林省谷歌地球高程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。
需要将吉林省谷歌地球高程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、吉林省谷歌地球高程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“吉林省谷歌地球高程DEM数据.tif”文件拖放到GlobalMapper中即可打开，效果如下图所示。
吉林省谷歌地球高程DEM数据局部放大之后，效果如下图所示。
五、吉林省谷歌地球高程DEM数据如何提取10米等高线？
吉林省谷歌地球高程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 Jilin 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