I. Overview
Guangxi Zhuang Autonomous Region, commonly known as Guangxi, referred to as "Gui", the capital Nanning, south of Beibu Gulf, is China's only coastal autonomous region. Guangxi is named after Lingnan West Road and Guangnan West Road. It is one of the main areas for the inheritance of Lingnan culture. It is also referred to as "Gui" because most of the territory belongs to the Qin unified Lingnan County and set up Guilin County.
Guangxi is located in South China, adjacent to Guangdong, Hunan, Guizhou and Yunnan, and faces Hainan across the sea. It borders the Beibu Gulf in the south, faces Southeast Asia, and is adjacent to Vietnam in the southwest. The mainland coastline is about 1,595 kilometers long. The most convenient passage to the sea occupies an important position in the economic exchanges between China and Southeast Asia.
In the pre-Qin period, Guangxi was part of the Baiyue land. The Zhuang and Dong peoples were the oldest aboriginal peoples in Guangxi, Lingnan. The results of archaeological research show that Lingnan had high civilizations in the Neolithic Age and Bronze Age in the pre-Qin period, and was one of the birthplaces of Chinese civilization. After the Qin and Han dynasties, various ethnic groups from the north gradually moved in, and now Guangxi has become a multi-ethnic province.
There are Zhuang, Yao, Miao, Dong, Mulao, Maonan, Hui, Jing and other ethnic minorities in Guangxi. The total number of ethnic minorities ranks first in the country. There are six Chinese dialects: Cantonese, Southwest Mandarin (Guiliu dialect), Hakka, Pinghua, Xiang dialect and Min dialect; Zhuang dialects include northern dialect and southern dialect, among which Wuming Zhuang is recognized as the official standard Zhuang language of the whole region; The national languages include Miao and Yao.
2. How to download Google Earth elevation DEM data in Guangxi Province?
The offline data package of the DEM contour line of Google Earth in Guangxi Province is 268.6MB, which can be downloaded directly from the Baidu network disk.
The download address is:
https://pan.baidu.com/s/1UCCKbKconmULm2Wyci9dcg
The decompressed directory mainly includes the Google Earth Elevation DEM Data .dat of Guangxi Province, the Google Earth Elevation DEM Data .idx of Guangxi Province, and the Google Earth Elevation DEM Data of Guangxi 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 of Guangxi Province
The administrative division of Google Earth elevation DEM data in Guangxi Province mainly includes 4 prefecture-level cities: Nanning, Liuzhou, Guilin, Wuzhou, Beihai, Fangchenggang, Qinzhou, Guigang, Yulin, Baise, Hezhou, Hechi City, Laibin City and Chongzuo City.
How to export Google Earth elevation DEM data in Guangxi Province as TIF files?
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.
In the file selection dialog box, you can select the "Guangxi Google Earth Elevation DEM Data.dat" file to be imported.
Click the file name in the list, you can view the tile mapping points of all pictures, and you can check the integrity of the data. If there is data, it is a green point, and if there is no data, it is a blue point. Click the "View Results" button to preview the rendering effect of the elevation DEM data.
Move the mouse over the name of the image to be exported, click the displayed "Export" button to display the "Export Settings" dialog box, you can stitch the downloaded Google Earth elevation DEM data of Guangxi Province into a large image, or export it as a Cesium open source 3D globe The elevation DEM tile data.
When exporting and splicing the Google Earth elevation DEM data in Guangxi Province into a large image, you can easily set the export file storage format, coordinate projection, and set the background transparency. At the same time, it supports exporting various plane coordinate projection methods such as Xi'an 80, Beijing 54 and WGS84.
Here, the coordinate projection is selected as "Xi'an 80 Gaussian projection", the file save format is "GeoTIF(*.tif)", the background is set to transparent, and related parameters such as clipping by boundary range are checked. After the setting is complete, click "OK" to export the download result.
When you need to export the Google Earth elevation DEM data in Guangxi Province as CESIUM open source 3D earth tiles, you only need to select the "Export Tiles" function item, and then select the tile format as "Elevation CES Tiles".
4. How to open and view the elevation DEM data of Google Earth in Guangxi Province?
Google Earth elevation DEM data needs to be opened and viewed in professional software, such as GlobalMapper or ArcGIS, etc. Here, GlobalMapper is used as an example. In the export result directory, drag and drop the "Guangxi Google Earth Elevation DEM Data.tif" file into GlobalMapper to open it, and the effect is shown in the figure below.
After the partial enlargement of the Google Earth elevation DEM data in Guangxi Province, the effect is shown in the figure below.
5. How to extract 10-meter contour lines from Google Earth elevation DEM data in Guangxi Province?
How to extract 10-meter contour lines from Google Earth elevation DEM data in Guangxi Province, please refer to the official website tutorial:
Method for extracting contour lines in SHP vector format
A Method of Extracting CAD Contours in DWG Vector Format
6. Conclusion
To sum up, the offline package of Google Earth elevation DEM data in Guangxi Province directly downloaded from Baidu's network disk can be exported as a TIF elevation file of Xi'an 80 or Beijing 54 coordinate system through the universal map downloader according to the 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