I. Overview
Jiangsu is abbreviated as "Su", and the provincial capital Nanjing is named after the initials of "Jiangning House" and "Suzhou House". It is located in the eastern coastal center of mainland China, the lower reaches of the Yangtze River, adjacent to the Yellow Sea in the east, adjacent to Zhejiang and Shanghai in the southeast, Anhui in the west, and Shandong in the north.
Jiangsu has four multicultural cultures of Jianghuai, Jinling, Wu and Central Plains. It is one of the birthplaces of ancient Chinese civilization. There are 13 famous national historical and cultural cities. "Wu Yun Han style" is the characteristic of Jiangsu culture.
In the early Qing Dynasty, Nanming was destroyed, Nanjing was abolished, and Jiangnan Province was established as the original area of Nanjing. In the sixth year of Emperor Kangxi (1667), Jiangnan Province was divided into two provinces, Jiangsu (including present-day Shanghai) and Anhui Province. , Songjiang House (now Shanghai), Yangzhou House, Huai'an House, Liangjiang Governor's Office in Nanjing, Jiangsu Governor Yamen in Suzhou. This is the beginning of the establishment of Jiangsu Province, and it is named after the first characters of Jiangning and Suzhou, and is referred to as "Su".
By the end of the Qing Dynasty, there were 8 prefectures, 3 Zhili prefectures and 1 Zhili hall under the jurisdiction of Jiangsu Province. During the period, the Taiping Heavenly Kingdom built its capital in Nanjing from the third year of Xianfeng to the third year of Tongzhi (1853-1864).
2. How to download Google Earth elevation DEM data in Jiangsu Province?
The offline data package of the Google Earth Elevation DEM contour line in Jiangsu Province is 61.5MB, which can be downloaded directly from the Baidu network disk.
The download address is:
https://pan.baidu.com/s/1G11mic-Ds0CYwIAndDypIg
The decompressed directory mainly includes the Google Earth Elevation DEM Data .dat of Jiangsu Province, the Google Earth Elevation DEM Data of Jiangsu Province .idx and the Google Earth Elevation DEM Data of Jiangsu 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 Jiangsu Province
The administrative division of Google Earth elevation DEM data in Jiangsu Province mainly includes 13 prefecture-level cities under the jurisdiction of Jiangsu Province (Nanjing City, Wuxi City, Xuzhou City, Changzhou City, Suzhou City, Nantong City, Lianyungang City, Huaian City, Yancheng City, Yangzhou City , Zhenjiang City, Taizhou City, Suqian City).
How to export Google Earth elevation DEM data as TIF files in Jiangsu 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.
In the file selection dialog box, you can select the "Jiangsu 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, and click the displayed "Export" button to display the "Export Settings" dialog box. You can stitch the downloaded Google Earth elevation DEM data of Jiangsu 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 of Jiangsu Province into a large image, it is convenient to 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 Jiangsu 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 Jiangsu 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 "Jiangsu 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 Jiangsu Province, the effect is shown in the following figure.
5. How to extract 10-meter contour lines from Google Earth elevation DEM data in Jiangsu Province?
How to extract 10-meter contour lines from Google Earth elevation DEM data in Jiangsu 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 Jiangsu Google Earth elevation DEM data directly downloaded from Baidu 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