The 2024 version of the map has recently been launched, and the online map service covering the whole country has been fully updated.

This update is the first time that multi-temporal satellite imagery is available, and the historical images of 32 provincial-level nodes can be viewed for nearly half a century.

What are the updates in the 2024 version of the Map?

The update and optimization of the 2024 version of Tiantu mainly include:

1. Added the three-dimensional display function of buildings in more than 100 urban built-up areas such as Huangpu District and Xuhui District of Shanghai, Chaoyang District and Daxing District of Beijing;

2. Added multi-temporal remote sensing images, administrative division visualization data application development interfaces, and terrain and mountain shadow services;

3. You can view the historical images of 32 provincial nodes for nearly half a century;

4. Update about 12,311,200 elements such as transportation, residential areas, water systems, green spaces, political districts, and place names and addresses, with a total of 330 million elements;

5. Updating 2-meter resolution satellite images of about 7.94 million square kilometers;

6. Update 1-meter resolution satellite images of about 6.55 million square kilometers;

7. The coverage rate of satellite images with 2-meter resolution is 100%;

8. The coverage rate of satellite images better than 1 meter is 98%;

9. Optimize geographical name retrieval, geocoding, map visualization engine services, etc.

How can I view images from the last 50 years?

Now, let's share how to look at the last 50 years of historical satellite imagery.

Open the official website of Map of China (https://www.tianditu.gov.cn) and click "Multi-phase Image" at the bottom to open the login page.

The official website of the map of the day

To view historical images, you need to complete the registration and login, which can be found in the article "How to request your own map of the sky".

Sign up and log in

After logging in, you can view historical images, here in Chengdu, for example, you can view satellite images as early as 1998, and you can view historical images from about 26 years ago.

View historical imagery

In the years listed, you can also select a month to view.

View historical imagery by month

The timeline of historical images that can be viewed in different regions is different, but it has not been found that any city can view historical images of the past half century, and if there is, it should be relatively low resolution.

How do I animate historical images?

You can animate the historical images of a place into GIFs to see how the surface is changing, and you can also see how the construction progress is changing.

Here is an example of a bridge to illustrate how to generate GIFs of historical images.

The query finds the target location where you want to generate animation, and then click the "Animation Generation" button.

Locate the target location

Drag the animation scope box to the appropriate position of the target, and on the left, select the historical image you want to use to generate the animation based on the date.

Select Historical Imagery

By default, the interval between historical images and images is 2 seconds, which you can set according to your actual effect.

After the settings are completed, click "Download GIF" to generate it, and then save the file to a suitable location.

Generate animated GIFs

The generated GIF file can be double-clicked to open for viewing, or it can be inserted into other programs such as documents for playback and display.

Animated GIF effects

In addition to generating animations, you can also click "Scroll" to view the multi-phase images in a scrolling way, so as to compare the old and new images.

Swipe mode to view historical imagery

You can also click on the "Dual Screen" button to view historical satellite imagery in dual-screen mode, analyzing and comparing changes in the surface.

Dual-screen mode to view historical imagery

The multi-temporal correlation feature of Map is very useful, and you can also use it to view and analyze changes in the area you are interested in.

Write at the end

The 2024 version of "Map of the World" also optimizes the place name retrieval service, improves the accuracy of place name query and matching, and greatly improves the convenience of user data sharing.

For more functional upgrades and updates, please refer to the announcement on the official website of Map of Days.

Resources:

"2024 National Geographic Information Public Service Platform Launched"

Original link: https://www.mnr.gov.cn/dt/ywbb/202404/t20240425_2843524.html

Announcement of the National Basic Geographic Information Center on Launching the 2024 Version of the National Geographic Information Public Service Platform (Tiantu)

Original link: https://www.ngcc.cn/xwzx/tzgg/202404/t20240424_2409.html