How to convert planning map into vector data with longitude and latitude geojson

One day, Party A's father sent the plan , No, CAD chart , There is no longitude and latitude information . It also requires the longitude and latitude coordinate data of various elements in the planning map , Show it on the map screen . So how to get from planning map to vector data ？ As shown in the following plan , place 【 Inaction city 】

First step , Get the plan 4 Point coordinates

First, find the 4 Point coordinates , We need to register the image of the planning map . We don't use it here arcgis Such as software , I used an image registration tool developed by me . Enter the location in the upper right corner ： Inaction city , Search to find the location . Its principle is very simple , By constantly moving the position of the front image and scale Zoom size , The final calculation 4 Point latitude and longitude .

Set the transparency of the front image , And open drag

By constantly moving the location of the plan , fine-tuning scale Zoom size . Be careful ： We take the left river line and the right red expressway as our main reference

Finally, click whether it fits , Click on mapbox Calculate the map

The second step , stay geobuilding It uses the planning map as the underlay , Drawing vector data

Use geobuilding Single image function , Upload plans and , And fill in the 4 Point latitude and longitude

Open the... In the lower left corner 【 Single image 】 Layer switch , Our plan appears on the map , You can drag at will , And you can set transparency in the toolbar in the upper right corner .

Now? , We have a reference map , You can draw the required vector data on it . such as

You can also set the color ,

Finally, let's look at vector data , See that there is already a vector data in the comparison map on the right , Finally, use the download function , Export to geojson file . It meets the needs of Party A's father .

geobuilding Download address https://share.weiyun.com/5dAbywSl

place ： Inaction city Picture address ：https://p7.itc.cn/q_70/images03/20210505/2b3ff11424da43b381360472353c7d61.png 4 Point coordinates [[117.93391510224097,31.32210420248049],[117.9729810951884,31.32210420248049],[117.9729810951884,31.274876529864216],[117.93391510224097,31.274876529864216]]